US20050103717A1 - Water treatment system and method - Google Patents
Water treatment system and method Download PDFInfo
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- US20050103717A1 US20050103717A1 US10/712,621 US71262103A US2005103717A1 US 20050103717 A1 US20050103717 A1 US 20050103717A1 US 71262103 A US71262103 A US 71262103A US 2005103717 A1 US2005103717 A1 US 2005103717A1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/006—Processes using a programmable logic controller [PLC] comprising a software program or a logic diagram
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
Definitions
- the present invention relates generally to a system and method of treating or purifying a fluid and, more particularly, to a water treatment system incorporating an electrochemical device with a reservoir system for delivering treated water to a point of use.
- Water that contains hardness species such as calcium and magnesium may be undesirable for some uses in industrial, commercial and household applications.
- the typical guidelines for a classification of water hardness are: zero to 60 milligrams per liter (mg/l) as calcium carbonate is classified as soft; 61 to 120 mg/l as moderately hard; 121 to 180 mg/l as hard; and more than 180 mg/l as very hard.
- Hard water can be treated by removing the hardness ion species.
- examples of systems that remove such species include those that use ion exchange beds.
- the hardness ions become ionically bound to oppositely charged ionic species that are mixed on the surface of the ion exchange resin.
- the ion exchange resin eventually becomes saturated with ionically bound hardness ion species and must be regenerated.
- Regeneration typically involves replacing the bound hardness species with more soluble ionic species, such as sodium chloride.
- the hardness species bound on the ion exchange resin are replaced by the sodium ions and the ion exchange resins are ready again for a subsequent water softening step.
- EDI Electrodeionization
- the electrically active media may function to collect and discharge ionizable species, or to facilitate the transport of ions by ionic or electronic substitution mechanisms.
- EDI devices can include media having permanent or temporary charge and can be operated to cause electrochemical reactions designed to achieve or enhance performance. These devices may also include electrically active membranes such as semi-permeable ion exchange or bipolar membranes.
- Continuous electrodeionization is a process that relies on ion transport through electrically active media or electroactive media.
- a typical CEDI device includes alternating electroactive semi-permeable anion and cation selective membranes. The spaces between the membranes are configured to create liquid flow compartments with inlets and outlets.
- a transverse DC electrical field is imposed by an external power source through electrodes at the bounds of the compartments.
- electrode compartments are provided so that reaction product from the electrodes can be separated from the other flow compartments. Upon imposition of the electric field, ions in the liquid to be treated in one compartment, the ion-depleting compartment, are attracted to their respective attracting electrodes.
- the ions migrate through the selectively permeable membranes into the adjoining compartments so that the liquid in the adjoining ion-concentrating compartments become ionically concentrated.
- the volume within the depleting compartments and, in some embodiments, within the concentrating compartments includes electrically active media.
- the electroactive media may include intimately mixed anion and cation exchange resin beads. Such electroactive media typically enhances the transport of ions within the compartments and may participate as a substrate for controlled electrochemical reactions.
- Electrodeionization devices have been described by, for example, Giuffrida et al. in U.S. Pat. Nos. 4,632,745, 4,925,541, and 5,211,823, by Ganzi in U.S. Pat. Nos. 5,259,936 and 5,316,637, by Oren et al. in U.S. Pat. No. 5,154,809 and by Kedem in U.S. Pat. No. 5,240,579.
- the present invention is directed to a water purification or treatment system comprising a pressurized reservoir system fluidly connected to a point of entry, a water treatment device fluidly connected to the pressurized reservoir system, a water distribution system fluidly connected to the pressurized reservoir system and at least one point of use fluidly connected to the water distribution system.
- a treatment system comprising a reservoir system fluidly connected to a point of entry, an electrochemical device fluidly connected to the reservoir system, a point of use fluidly connected to the reservoir system, and an auxiliary use fluidly connected downstream of the electrochemical device.
- a method for treating water comprising introducing water to a pressurized reservoir system, transferring a portion of the water from the pressurized reservoir system to a water treatment device, removing at least a portion of any undesirable species from the water from the pressurized reservoir system in the water treatment device to produce a treated water, transferring the treated water from the water treatment device to the pressurized reservoir system and distributing a portion of the treated water from the pressurized reservoir system to a point of use.
- a method for treating water comprising introducing water from a point of use to a reservoir system, removing at least a portion of any undesirable species from the water in the reservoir system in an electrochemical device to produce treated water and discharge water, transferring at least a portion of the treated water from the electrochemical device to the reservoir system, transferring a portion of the discharge water to an auxiliary use, and distributing a portion of the treated water from the reservoir system to a point of use.
- a water distribution system comprising a first pretreatment system fluidly connected to a point of entry, a pressurized reservoir system fluidly connected downstream of the first pretreatment system, a second pretreatment system fluidly connected to the pressurized reservoir system and an electrochemical device fluidly connected downstream of the second pretreatment system and to the pressurized reservoir system.
- a water treatment system comprising means for accumulating water from a water source at a pressure above atmospheric pressure and an electrochemical device fluidly connected to the means for accumulating water.
- a method for treating water comprising mixing water from a point of entry with a treated water to produce a mixed water, removing a portion of any undesirable species from a portion of the mixed water in an electrochemical device to produce the treated water and distributing a portion of the mixed water to a point of use.
- a method for treating water comprising accumulating water from a point of use, removing at least a portion of any undesirable species from the water in an electrochemical device to produce treated water, and supplying at least a portion of the treated water to a household.
- a method for treating water comprising accumulating water from a point of use at a pressure that is above atmospheric pressure, providing an electrochemical device electrochemical device, transferring at least a portion of the accumulated water to the electrochemical device, removing at least a portion of any undesirable species from the water in the electrochemical device to produce a treated water, and adjusting at least one operating parameter of the electrochemical device.
- the present invention provides a system comprising a fluid reservoir in thermal communication with a heat exchanger and a fluid treatment device fluidly connected to the fluid reservoir.
- the present invention provides a method for facilitating water treatment.
- the method can comprises providing a system comprising a pressurizable reservoir system that is fluidly connectable to a point of entry and an electrochemical device fluidly connected to the pressurizable reservoir system and fluidly connectable to a water distribution system.
- FIG. 1 is a process flow diagram of a water treatment system showing an in-line system with a pressurized reservoir system and a treatment device in accordance with one or more embodiments of the invention
- FIG. 2 is a schematic, sectional view through a typical electrochemical device in accordance with one or more embodiments of the present invention, illustrating the fluid and ion flow directions through depleting and concentrating compartments;
- FIG. 3 is a schematic flow diagram of a water treatment system in accordance with one or more embodiments of the invention as discussed in Example 1;
- FIG. 4 is a graph showing conductivity of water treated in the water treatment system exemplarily illustrated in FIG. 3 and discussed in Example 1;
- FIG. 5 is a schematic flow diagram of a water treatment system in accordance with one or more embodiments of the invention as discussed in Example 2;
- FIG. 6 is a graph showing conductivity of water treated in the water treatment system exemplarily illustrated in FIG. 5 and discussed in Example 2.
- the present invention is directed to a water treatment or purification system and method of providing treated water in industrial, commercial and residential settings.
- the treatment system can provide treated water to a point of use by removing at least a portion of any hardness-causing species contained in water from a water source, such as municipal water, well water, brackish water and water containing foulants.
- a water source such as municipal water, well water, brackish water and water containing foulants.
- Other applications of the system would be in the treatment and processing of foods and beverages, sugars, various industries, such as the chemical, pharmaceutical, food and beverage, wastewater treatments and power-generating industries.
- the present invention will be described using water as the fluid but should not be limited as such. For example, where reference is made to treated water, it is believed that other fluids can be treated according to the present invention.
- the fluid to be treated may be a fluid that is a mixture comprising water.
- the fluid can be a liquid that can comprise water.
- the water purification or treatment system in accordance with one or more embodiments of the present invention typically receives water from the water source or a point of entry and purifies the water containing at least some undesirable species before delivering the treated water to a point of use.
- the treatment system typically has a reservoir system in line with a water purification or treatment apparatus such as, but not limited to, an electrodeionization device, a reverse osmosis device, an electrodialysis device, a capacitive deionization device, a microfiltration device, and/or an ultrafiltration device.
- the treatment system in some embodiments of the present invention, further comprises a sensor for measuring at least one property of the water or an operating condition of the treatment system.
- the treatment system also includes a controller for adjusting or regulating at least one operating parameter of the treatment system or a component of the treatment system.
- FIG. 1 shows a schematic flow diagram of a treatment system according to one embodiment of the present invention.
- Treatment system 10 includes a reservoir system 12 fluidly connected, typically, to a liquid source or a point of entry 14 and to a purification or treatment device 16 , typically downstream of the point of entry.
- Treatment system 10 typically includes a point of use 18 , which is typically fluidly connected downstream of reservoir system 12 .
- treatment system 10 also has a sensor 20 and a controller 22 for controlling or regulating power source 24 which provides power to treatment device 16 .
- Treatment device 16 typically removes at least a portion of any undesirable species from the liquid to be treated, flowing from point of entry 14 , to produce treated liquid, such was treated water, for storage in reservoir system 12 and ultimate delivery to point of use 18 .
- Undesirable species removed by treatment device 16 can be transferred to an auxiliary use or a drain 26 .
- treatment system 10 further includes pretreatment system 28 , which is typically fluidly connected upstream of reservoir system 12 or treatment device 16 .
- pretreatment system 28 typically also includes one or more fluid control components, such as pump 30 and valve 32 .
- pressurized refers to a system or component that has a pressure, internal or applied, that is above atmospheric pressure.
- pressurized reservoir system 12 has an internal pressure that is greater than atmospheric pressure.
- Pressure in the pressurized reservoir system can be created by various methods and techniques, for example, by pressurizing the water with a water pump or by elevating the water source, thus creating head pressure.
- treated water or fluid the treated water can be softened water, low Langelier Saturation Index (LSI) water or low conductivity water.
- LSI Langelier Saturation Index
- low LSI water has a LSI of less than about 2, preferably, less than about 1, and more preferably, less than about zero.
- treatment device or “purification device” or apparatus pertains to any apparatus that can be used to remove or reduce the concentration any undesirable species from a fluid to be treated.
- treatment apparatus include, but are not limited to, those that rely on techniques such as ion-exchange resin reverse osmosis, electrodeionization, electrodialysis, ultrafiltration, microfiltration, capacitive deionization.
- Electrodeionization device 16 such reference is meant to be exemplary and other electrochemical devices such as, but not limited to, electrodeionization devices, electrodialysis devices, and, in some cases, capacitive deionization devices, may be used in accordance with the principles of the present invention as long as such use is not inconsistent or contrary to operation of such devices and/or the techniques of the present invention.
- electrochemical devices such as “electrodeionization device 16 ”
- electrodialysis devices such as, in some cases, capacitive deionization devices
- capacitive deionization devices may be used in accordance with the principles of the present invention as long as such use is not inconsistent or contrary to operation of such devices and/or the techniques of the present invention.
- capacitive deionization devices may be used in accordance with the principles of the present invention as long as such use is not inconsistent or contrary to operation of such devices and/or the techniques of the present invention.
- a number of apparatus may be used as a treatment device, the applicability of such
- FIG. 2 schematically shows a cross-sectional view of fluid and ion flow paths through one embodiment of an electrodeionization device of the present invention.
- the electrodeionization module or device 16 includes ion-depleting (depleting) compartments 34 and ion-concentrating (concentrating) compartments 36 , positioned between depleting compartments 34 .
- Depleting compartments 34 are typically bordered by an anolyte compartment 38 and a catholyte compartment 40 .
- end blocks (not shown) are positioned adjacent to end plates (not shown) to house an anode 42 and a cathode 44 in the respective compartments.
- the compartments include cation-selective membranes 46 and anion-selective membranes 48 .
- the cation-selective membranes and anion-selective membranes typically comprise ion exchange powder, a polyethylene powder binder and a glycerin lubricant.
- the cation- and anion-selective membranes are typically heterogeneous polyolefin-based membranes, which are typically extruded by a thermoplastic process using heat and pressure to create a composite sheet.
- the present invention contemplates the use of the other types of membranes including homogeneous membranes.
- Suitable ion-selective membranes include, for example, web supported using styrene-divinyl benzene with sulphonic acid or quaternary ammonium functional groups, web supported using styrene-divinyl benzene in a polyvinylidene fluoride binder, and unsupported-sulfonated styrene and quarternized vinyl benzyl amine grafts on polyethylene sheet.
- Concentrating compartments 36 are typically filled with electroactive media such as cation exchange resin beads 50 and depleting compartments 34 are typically filled with a mixture of cation exchange resin beads 50 and anion exchange resin beads 52 .
- the cation exchange and anion exchange resin beads can be arranged in layers within any of the depleting, concentrating and electrode compartments so that a number of layers in a variety of arrangements can be assembled.
- a liquid to be treated 54 typically from an upstream water source entering the treatment system at point of entry 14 , having dissolved cationic and anionic components, including hardness ion species, can be introduced into depleting compartments 34 through manifold 60 , wherein the cationic components are typically attracted to the cation exchange resin beads 50 and the anionic components are attracted to the anion exchange resin beads 52 .
- An electric field applied across electrodeionization device 16 through anode 42 and cathode 44 , which are typically positioned on opposite ends of electrodeionization device 16 , typically passes perpendicularly relative to the fluid flow direction. Under the influence of the electric field, cationic and anionic components in the liquid tend to migrate in a direction corresponding to their attracting electrodes. Cationic components can migrate through cation-selective membrane 46 into adjacent concentrating compartment 36 .
- Anion-selective membrane 48 positioned on the opposite side of concentrating compartment 36 , prevents migration into adjacent compartments, thereby trapping the cationic components in the concentrating compartment.
- anionic components migrate through the ion-selective membranes, but in a direction that is opposite relative to the migration direction of the cationic components.
- Anionic components migrate through anion-selective membrane 48 , from depleting compartment 34 , into adjacent concentrating compartment 36 .
- Cation-selective membrane 46 positioned on the other side of concentrating compartment 36 , prevents further migration, thus trapping anionic components in the concentrating compartment.
- ionic components are removed or depleted from the liquid 54 flowing in depleting compartments 34 and collected in concentrating compartments 36 resulting in a treated water product stream 56 and a concentrate or waste stream 58 .
- the applied electric field on electrodeionization device 16 creates a polarization phenomenon, which typically leads to the dissociation of water into hydrogen and hydroxyl ions.
- the hydrogen and hydroxyl ions regenerate the ion exchange resin beads 50 and 52 in depleting compartments 34 and in some embodiments, concentrating compartments 36 , so that removal of dissolved ionic components can occur continuously and without a separate step for regenerating exhausted electroactive media.
- the applied electric field on electrodeionization device 16 is typically a direct current.
- any applied electric current that creates a bias or a potential difference between one electrode and another can be used to promote migration of ionic species by, for example, ionic attraction. Therefore, an alternating current may be used, provided that there is a potential difference between electrodes that is sufficient to attract cationic and anionic species to the respective attracting electrodes.
- an alternating current may be rectified, for example, by using a diode or a bridge rectifier, to convert an alternating current to a pulsating current with sufficient potential to attract the charged species.
- the electroactive media, ion exchange resin beads 50 and 52 can have a variety of functional groups on their surface regions including, but not limited to, tertiary, alkyl amino groups and dimethyl ethanolamine. These materials can also be used in combination with materials having various functional groups on their surface regions, such as quaternary ammonium groups.
- Other modifications and equivalents of the electrodeionization device, as part of the water treatment system disclosed, will occur to persons skilled in the art using no more than routine experimentation.
- various other types of electroactive media may be used such as heterogeneous and homogeneous types.
- other variations in arrangements of depleting and concentrating compartments are believed to be within the scope and spirit of the invention.
- Reservoir system 12 serves to store or accumulate water from point of entry 14 or a water source and can also serve to store treated water from product stream 56 from electrodeionization device 16 and can also provide water, typically treated water, or treated water mixed with water from point of entry 14 , to point of use 18 through a distribution system.
- reservoir system 12 comprises a pressurized vessel or a vessel that has inlets and outlets for fluid flow such as an inlet 62 and an outlet 64 .
- Inlet 62 is typically fluidly connected to point of entry 14 and outlet 64 is typically fluidly connected to a water distribution system or a point of use 18 .
- Reservoir system 12 can have several vessels, each vessel, in turn, can have several inlets positioned at various locations.
- outlet 64 can be positioned on each vessel at various locations depending on, among other things, demand or flow rate to point of use 18 , capacity or efficiency of electrodeionization device 16 and capacity or hold-up of reservoir system 12 .
- Reservoir system 12 can further comprise various components or elements that perform desirable functions or avoid undesirable consequences.
- reservoir system 12 can have vessels having internal components, such as baffles that are positioned to disrupt any internal flow currents within the vessels of reservoir system 12 .
- reservoir system 12 has a heat exchanger for heating or cooling the fluid.
- reservoir system 12 can comprise a vessel with a heating coil, which can have a heating fluid at an elevated temperature relative to the temperature of the fluid in the vessel.
- the heating fluid can be hot water in closed-loop flow with a furnace or other heating generating unit operation so that the heating fluid temperature is raised in the furnace.
- the heating fluid raises the vessel fluid temperature by heat transfer.
- auxiliary or additional components include, but are not limited to, pressure relief valves designed to relieve internal pressure of any vessels and avoid or at least reduce the likelihood of vessel rupture and thermal expansion tanks that are suitable for maintaining a desired operating pressure.
- the size and capacity of the thermal expansion tank will depend on factors including, but not limited to, the total volume of water, the operating temperature and pressure of the reservoir system.
- the reservoir system is connected in or in thermal communication with the heat exchanger and, optionally, to a fluid treatment device.
- the fluid treatment device can be an electrodeionization device, a reverse osmosis device, an ion-exchange resin bed, an electrodialysis device, a capacitive deionization device, or combinations thereof.
- reservoir system 12 is typically connected downstream of point of entry 14 and fluidly connected in-line, such as in a circulation loop, with electrodeionization device 16 .
- water from point of entry 14 can flow into inlet 62 and can mix with the bulk water contained within reservoir system 12 .
- Bulk water can exit reservoir system 12 through outlet 64 and can be directed to point of use 18 or through pump 30 into electrodeionization device 16 for treatment or removal of any undesirable species.
- Treated water leaving electrodeionization device 16 can mix with water from point of entry 14 and enter reservoir system 12 through inlet 62 . In this way, a loop can be formed between reservoir system 12 and electrodeionization device 16 and feedwater from point of entry 14 can replenish water demand created by and flowing to point of use 18 .
- Point of entry 14 provides or connects water from a water source to the water treatment system.
- the water source can be a potable water source, such as municipal water source or well water or it can be a non-potable water source, such as a brackish or salt-water source.
- an intermediate treatment or treatment system typically purifies the water for human consumption before it reaches point of entry 14 .
- the water typically contains dissolved salts or ionic or ionizable species including sodium, chloride, chlorine, calcium ions, magnesium ions, carbonates, sulfates or other insoluble or semi-soluble species or dissolved gases, such as silica and carbon dioxide.
- the water can contain additives, such as fluoride, chlorate and bromate.
- treatment system 10 includes a fluid distribution system (not shown), which in turn connects to a point of use.
- the distribution system can comprise components that are fluidly connected to provide, for example, water, typically treated water, from reservoir system 12 to point of use 18 .
- the distribution system can comprise any arrangement of pipes, valves, tees, pumps and manifolds to provide water from reservoir system 12 to one or several points of use 18 or to any component of treatment system 10 .
- the distribution system comprises a household or residential water distribution system including, but not limited to, connections to one or more points of use such, but not limited to, a sink faucet, a shower head, a washing machine and a dishwasher.
- system 10 may be connected to the cold or hot, or both, water distribution system of a household.
- Point of use 18 is typically any device or appliance that requires or demands water.
- point of use 18 can be an appliance, such as a washing machine or a dishwasher, or can be a faucet serving to provide water to a kitchen sink or a showerhead.
- point of use 18 comprises a system for providing water suitable for household or residential use.
- water treatment system 10 also comprises a sensor, such as a water property sensor, which measures at least one physical property in treatment system 10 .
- sensor 20 can be a device that can measure water conductivity, pH, temperature, pressure, composition or flow rate.
- Sensor 20 can be installed or positioned within treatment system 10 to measure a particularly preferred water property.
- sensor 20 can be a water conductivity sensor installed in reservoir system 12 so that sensor 20 measures the conductivity of the water, which can provide an indication of the quality of the water available for service in point of use 18 .
- sensor 20 can comprise a series or a set of sensors in any various configurations or arrangements in treatment system 10 .
- the set of sensors can be constructed, arranged or connected to controller 22 so that controller 22 can monitor, intermittently or continuously, the quality of water in, for example, reservoir system 12 .
- the performance of treatment system 10 can be optimized as described below.
- Other embodiments may comprise a combination of sets of sensors in various locations throughout treatment system 10 .
- sensor 20 can be a flow sensor measuring a flow rate to a point of use 18 and further include any of a pH meter, nephelometer, composition analyzer, temperature and pressure sensor monitoring the operating condition of treatment system 10 .
- water treatment system 10 can further comprise a pretreatment system 28 designed to remove a portion of any undesirable species from the water before the water is introduced to, for example, reservoir system 12 or the electrodeionization device 16 .
- pretreatment systems include, but are not limited to, reverse osmosis devices, which are typically used to desalinate brackish or salt water.
- a carbon or charcoal filter may be used to remove at least a portion of any chlorine, including active chlorine, or any species that may foul or interfere with the operation of electrodeionization device 16 .
- Pretreatment system 28 can be positioned anywhere within water treatment system 10 .
- pretreatment system 28 can be positioned upstream of reservoir system 12 or downstream of system 12 but upstream of electrodeionization device 16 so that at least some chlorine species are retained in reservoir system 12 but are removed before water enters electrodeionization device 16 .
- disinfecting and/or cleaning apparatus or systems may be utilized with the treatment system.
- Such disinfecting or cleaning system can comprise any apparatus that destroys or renders inactive, at least partially, any microorganisms, such as bacteria, that can accumulate in any component of the treatment system.
- cleaning or disinfecting systems include those that can introduce a disinfectant or disinfecting chemical compounds, such as halogens, halogen-donors, acids or bases, as well as systems that expose wetted components of the treatment system to hot water at a temperature capable of sanitization.
- the treatment system can include final stage or post treatment systems or subsystems that provide final purification of the fluid prior to delivery at a point of use. Examples of such post treatment systems include, but are not limited to those that expose the fluid to actinic radiation or ultraviolet radiation, and/or ozone or remove undesirable compounds by micro filtration or ultrafiltration.
- the treatment system may be utilized for household service and installed, for example, under a sink and provide treated water, which is treated by exposure to ultraviolet radiation, before being delivered to a point of use, such as a faucet.
- treatment system 10 can further comprise a controller 22 that is capable of monitoring and regulating the operating conditions of treatment system 10 and its components.
- Controller 22 typically comprises a microprocessor-based device, such as a programmable logic controller (PLC) or a distributed control system that receives or sends input and output signals to components of treatment system 10 .
- controller 22 can comprise a PLC that sends a signal to power source 24 , which supplies power to electrodeionization device 16 or can provide a signal to a motor control center that provides power to pumps 30 .
- controller 22 regulates the operating conditions of water treatment system 10 in open-loop or closed-loop control scheme.
- controller 22 in open-loop control, can provide signals to the water treatment system such that water is treated without measuring any operating condition. Controller 22 can control the operating conditions in closed-loop control so that operating parameters can be adjusted depending on an operating condition measured by, for example, sensor 20 . In yet another embodiment, controller 22 can further comprise a communication system such as a remote communication device for transmitting or sending the measured operating condition or operating parameter to a remote station.
- a communication system such as a remote communication device for transmitting or sending the measured operating condition or operating parameter to a remote station.
- controller 22 can provide a signal that actuates a valve 32 in treatment system 10 so that fluid flow in treatment system 10 is adjusted based on a variety of parameters including, but not limited to, the quality of water from point of entry 14 , the quality of water to point of use 18 , the demand or quantity of water to point of use 18 , the operating efficiency or capacity of electrodeionization device 16 , or any of a variety of operating conditions, such as the water conductivity, pH, turbidity, composition, temperature, pressure and flow rate.
- controller 22 receives signals from sensor 20 so that controller 22 is capable of monitoring the operating parameters of treatment system 10 .
- sensor 20 can be a water conductivity sensor positioned within reservoir system 12 so that the water conductivity in reservoir system 12 is monitored by controller 22 .
- Controller 22 can, based on, for example, the water quality measured by sensor 20 , control power source 24 , which provides an electric field to electrodeionization device 16 . So, in operation, controller 22 can increase or decrease or otherwise adjust the voltage and current or both supplied from power source 24 to electrodeionization device 16 .
- Controller 22 typically includes algorithms that can change an operating parameter of treatment system 10 based on one or more measured properties of the liquid flowing in the system.
- controller 22 can increase or decrease or otherwise adjust the period between operating cycles of electrodeionization device 16 , such as, but not limited to, cycles of reversing applied electric field and the associated fluid flow.
- controller 22 can reverse the direction of the applied current from power source 24 to electrodeionization device 16 according to a predetermined schedule or according to an operating condition, such as the water quality or any other operating parameter.
- Polarity reversal has been described by, for example, Giuffrida et al., in U.S. Pat. No. 4,956,071, which is incorporated herein by reference in its entirety.
- Controller 22 can be configured or configurable by programming or can be self-adjusting such that it is capable of maximizing, for example, any of the service life and the efficiency of or reducing the operating cost of treatment system 10 .
- controller 22 can comprise a microprocessor having user-selectable set points or self-adjusting set points that adjusts the applied voltage and current to electrodeionization device 16 , the flow rate through the concentrating and depleting compartments of the electrodeionization device or the discharge flow rate to drain 26 from the electrodeionization device or the pretreatment system or both.
- Other modifications and equivalents of the controller, as part of the water treatment system disclosed, will occur to persons skilled in the art using no more than routine experimentation.
- the use of adaptive, self-adjusting, or self-diagnosing controllers capable of changing the operating parameters based on a variety of input parameters such as rate of water use or time of water use, are believed to be within the scope and spirit of the invention.
- controller 22 can calculate a control parameter that can be used to adjust or vary a control signal to a component of the water treatment system.
- controller 22 can calculate a LSI based on the measured operating conditions of the streams of the water treatment system. LSI can then be used in another or the same control loop, in the same or another controller, as an input variable that can be compared to a set-point and generate an output signal that actuates, adjusts or otherwise regulates a component of the water treatment system.
- LSI can be calculated according to, for example, ASTM D 3739.
- Controller 22 can incorporate dead band control to reduce the likelihood of unstable on/off control or chattering.
- Dead band refers to the range of signal outputs that a sensor provides without necessarily triggering a responsive control signal.
- the dead band may reside, in some cases, intrinsically in the sensor or may be programmed as part of the control system, or both.
- Dead band control can avoid unnecessary intermittent operation by smoothing out measurement excursions.
- Such control techniques can prolong the operating life or mean time before failure of the components of treatment system 10 .
- Other techniques that can be used include the use of voting, time-smoothing or time-averaging measurements or combinations thereof.
- discharge water typical from waste stream 58 , to auxiliary use can serve or provide additional or secondary benefits.
- waste stream 58 rather than going to drain 26 , may be used to provide, for example, irrigating water to any residential, commercial or industrial use, such as for irrigating, for recycling or for recovery of collected or concentrated salts.
- the treatment system includes a mixing system that is fluidly connected to at least one of the distribution system and the reservoir system.
- the mixing or blending system can include a fluid connection in the distribution system as well as a fluid connection to the point of entry.
- the mixing system can provide fluid mixing of, for example, untreated water with treated water to produce service water that can be used at the point of use.
- the mixing system can include at least one a tee and a mixing tank, or both, that fluidly connects an outlet of the reservoir system and the point of entry.
- the mixing system in some cases, can include a valve that regulates the flow of any of the untreated water stream and the treated water stream flowing to the point of use.
- the valve can be a proportional valve that mixes the treated water with untreated water according to a predetermined ratio.
- the valve can be actuated by the controller depending on any of the flow rate, the water property and the particular service associated with the point of use.
- the controller can regulate the amount of untreated water, if any, that can be mixed with treated water by actuating a valve, which regulates the flow rate of the untreated water, in closed-loop control with a sensor measuring the conductivity of the mixed water stream.
- the valve can regulate the flow rate of the treated water that would be mixed with the untreated water according to the requirements of the point of use.
- the treatment device can be operated to reach a set-point that is lower than any required by various points of use so that any mixing of treated water with untreated water can produce service water that satisfies the particular requirements of each point of use.
- the present invention can be adjustable to accommodate fluctuations in demand as well as variations in water quality requirements.
- the present invention can provide a water treatment system that can produce low LSI water, which would be available to the system as a whole, during extended idle periods.
- the low LSI water in some embodiments, can be used to flush the wetted components of the treatment system, which can reduce the likelihood of scaling and should increase the service life of the components, individually, as well as the treatment system as a whole.
- the present invention provides a system for producing treated liquids, such as water, having a low conductivity.
- a low conductivity liquid has a conductivity of less than about 300 ⁇ S/cm, preferably less than about 220 ⁇ S/cm and more preferably, less than about 200 ⁇ S/cm.
- the treatment system can comprise a fluid circuit that can provide treated or, in some cases, softened water or, in other cases, low conductivity water or low LSI water, to an electrode compartment of the treatment device such as an electrodeionization device.
- the fluid circuit can comprise fluid connections from a treated water source to the electrode compartments of the electrodeionization device.
- the fluid circuit can also comprise a pretreatment unit, such as a carbon filter that can remove any species, such as chlorine, which can interfere with the operation of the electrodeionization device.
- the fluid circuit can also include fluid connections to at least one of the depleting and the concentrating compartments of the electrodeionization device, for example, downstream of the pretreatment unit.
- the fluid circuit connections in accordance with one or more embodiments of the present invention provides connections so that fluid exiting the electrode compartments can be, for example, mixed together or mixed with fluid to be treated in the depleting compartment.
- the fluid circuit can also comprise pumps and valves that can direct fluid flow to and from the electrodeionization device as well as to and from the reservoir system.
- the fluid circuit is arranged to provide fluid connections that creates parallel flow paths through the electrode compartments of the electrodeionization device.
- the treatment system can comprise a fluid circuit that provides fluid connections from a depleting compartment to at least one electrode compartment of the electrodeionization device. Such an arrangement can provide treated water, preferably water having low LSI or low conductivity, or both, to the electrode compartment.
- the fluid circuit can be arranged so that the fluid flow paths can be in series or in parallel through the electrode compartments.
- the fluid circuit can also comprise fluid connections to allow the fluid that would exit the electrode compartment to be delivered to a point of use via, for example, a water distribution system or to a reservoir system, or to both.
- the fluid circuit can comprise fluid connections so that untreated fluid can be mixed with fluid that would exit any of electrode compartments; the mixture can be delivered to the point of use.
- the fluid circuit can further comprise fluid connections to and from a reservoir system so that, for example, treated fluid that would exit the depleting compartment can be transferred to the reservoir system and mixed with untreated fluid from the point of entry and the mixture can be delivered to the point of use and, optionally, to the electrode compartments of the electrodeionization device in parallel or series flow paths.
- Other arrangements and combinations including, for example, the mixing of treated and untreated water to produce a mixed electrode compartment flushing fluid is considered to be within the scope of the present invention.
- FIG. 3 An in-line pressurized water treatment system in accordance with one or more embodiments of the systems and techniques of the present invention, schematically shown in FIG. 3 , was evaluated for performance.
- the water treatment system 10 had an electrodeionization module 16 with a pretreatment system (not shown) and a pressurized storage vessel 12 .
- Water, from point of entry 14 was introduced into pressurized vessel 12 and was circulated through electrodeionization module 16 .
- the water treatment system was controlled by a programmable controller (not shown) based on a measured water conductivity, as measured by sensors 20 b and 20 c , upstream of an inlet 62 and downstream of an outlet 64 of pressurized vessel 12 .
- Electrodeionization device 16 comprised of a 10-cell pair stack with 13-inch flowpaths. Each cell was filled with about 40% AMBERLITE® SF 120 resin and about 60% AMBERLITE® IRA 458 resin, both available from Rohm & Haas Company, Philadelphia, Pa.
- the electrodeionization device had an expanded titanium electrode, which was coated with ruthenium oxide.
- the pretreatment system comprised of an aeration type iron-filter with a 25-micron rating, a 20 inch ⁇ 4 inch sediment filter and a 20 inch ⁇ 4 inch carbon block filter.
- Pressurized vessel 12 was about a 10 inch diameter fiberglass vessel with about a 17-gallon capacity. The pressurized vessel was fitted with a valve head and a center manifold pipe.
- the concentrate stream leaving the electrodeionization device was partially circulated and partially rejected to a drain 26 by regulating valves 32 b , 32 c , 32 e , 32 f , 32 g , 32 h , 32 j and 32 l .
- Make-up water, from point of entry 14 was fed into the circulating stream to compensate for any water that was rejected to drain 26 by actuating valves 32 b , 32 c and 32 d , in proper sequence.
- Treated water exited electrodeionization device 16 and was returned to vessel 12 through a return fluid circuit having a liquid conduit and valves 32 i and 32 k.
- the flow rate of treated water to a point of use 18 from outlet 64 of pressurized vessel 12 was regulated by adjusting valve 32 a .
- Several sensors measuring operating conditions and water properties were installed throughout water treatment system 10 including pressure indicators 20 d , 20 f , 20 g , 20 h and 20 i , flow rate indicators 20 a , 20 e , 20 j and 20 k and conductivity sensors 20 b , 20 c and 201 .
- the controller was a MICROLOGIXTM 1000 programmable controller available from Allen-Bradley Company, Inc., Milwaukee, Wis., which was used to control the valve sequencing as well as to monitor and record the operating conditions of the system.
- the controller fluidly isolated the electrodeionization device when a set-point was reached.
- the controller started the electrodeionization device depending on whether a flow switch signal triggered operation or when the water conductivity of the outlet stream leaving the pressurized vessel was higher than the set point.
- the feed from the electrodeionization device was circulated from the pressurized vessel via a second feed pump.
- the polarity of the electric field applied to the electrodeionization device was reversed by the controller every 15 minutes.
- the water treatment system was operated until a set point was reached.
- the applied voltage to the electrodeionization device was about 50 volts.
- the flow rate through the electrodeionization device was maintained at about 2000 ml/min.
- Tables 1 and 2 summarize the measured properties of the various streams of the water treatment system at the start and end of the test, respectively. Notably, the data presented in Table 1 showed that the initial feed stream into electrodeionization device 16 , with a conductivity of about 462 ⁇ S/cm, was treated to produce an initial dilute stream having a conductivity of about 374 ⁇ S/cm without a substantial pH change.
- feed water was treated from a conductivity of about 255 ⁇ S/cm to produce a dilute stream with a conductivity of about 158 ⁇ S/cm.
- the lower conductivity of the feed stream at the end of the test run reflected the effect of circulation, which effectively removed undesirable species over several passes.
- FIG. 4 shows the conductivity of the water along with the applied current through the electrodeionization device during the test run.
- FIG. 4 also shows that the conductivity of the product stream, to service such as a point of use and labeled as tank outlet and dilute feed, was reduced to less than about 300 ⁇ S/cm.
- FIG. 4 shows that the applied current was reduced, as expected, with decreasing concentration of hardness species.
- the water treatment system of the present invention reduced the hardness, as measured by conductivity, by about 70% while delivering about 80 gallons per day.
- FIG. 5 An in-line pressurized water treatment system in accordance with one or more embodiments of the present invention, schematically shown in FIG. 5 , was evaluated for performance.
- the water treatment system 10 had an electrodeionization module 16 and a pressurized storage vessel 12 .
- Water, from point of entry 14 was introduced into pressurized storage vessel 12 through inlet 62 and was circulated using pumps 30 a and 30 b and treated through pretreatment units 28 a and 28 b and electrodeionization module 16 .
- the water treatment system was controlled by a programmable controller (not shown) based on the measured water conductivity, as measured by sensors any of 20 a , 20 b , and 20 c.
- Electrodeionization device 16 comprised of a 10-cell pair stack with flowpaths that were about 7.5 inches long and about 2.5 inches wide. Each cell was filled with about 40% AMBERLITE® SF 120 resin and about 60% AMBERLITE® IRA 458 resin, both available from Rohm & Haas Company, Philadelphia, Pa. The electrodeionization device had an expanded titanium electrode coated with ruthenium oxide.
- the controller was a MICROLOGIXTM 1000 programmable controller available from Allen-Bradley Company, Inc., Milwaukee, Wis.
- the electrodeionization device was set to start up either by a flow switch signal or when the water conductivity of the outlet stream leaving the pressurized vessel was higher than a set point.
- the electrodeionization device operated until the conductivity reached the set point.
- the feed from the electrodeionization device was circulated from the pressurized vessel via a second feed pump.
- the polarity of the electric field applied to the electrodeionization device was reversed about every 15 minutes.
- the PLC collected, stored and transmitted measured data from sensors 20 a , 20 b , 20 c and 20 d.
- Pressurized vessel 12 was a 10-inch diameter fiberglass vessel with a 30-gallon capacity. Pressurized vessel 12 was fitted with a valve head and a center manifold pipe. The concentrate stream leaving the electrodeionization device was partially circulated and partially rejected to a drain 26 by regulating valves 32 c , 32 d , 32 e , 32 f and 32 g . Make-up water, from point of entry 14 , was fed into the circulating stream to compensate for any water that was rejected to drain 26 .
- the pretreatment system comprised of an aeration iron-filter with a 25-micron rating, a 20 inch ⁇ 4 inch sediment filter and a 20 inch ⁇ 4 inch carbon block filter.
- water from pressure vessel 12 was pumped by pump 30 a , from pressure vessel 12 through valve 32 c , to pretreatment unit 28 a before being introduced to the depleting compartments (not shown) of electrodeionization device 16 .
- Treated water from electrodeionization device 16 was directed by valve 32 f to storage in pressure vessel 12 .
- Fluid collecting removed ionic species was circulated by pump 30 b through pretreatment unit 28 b , the concentrating and electrode compartments (not shown) of electrodeionization device 16 and valve 32 e .
- the flow rate of treated water, as measured by flow indicator 20 d , to a point of use 18 from outlet 64 of pressurized vessel 12 was regulated by adjusting valves 32 a and 32 b .
- valve 32 g was operated as necessary. Water from point of entry 14 was used to replace fluid that was discharged to drain 26 .
- the water treatment system was operated until a target set point of about 220 ⁇ S/cm was reached and stable for about one minute.
- the applied voltage to the electrodeionization device was about 46 volts.
- the flow rates into the depleting and concentrating compartments were maintained at about 4.4 liters per minute.
- the reject flow rate was controlled to discharge about 270 ml of the concentrate stream about every 30 seconds.
- the pressure in the vessel was about 15 psig to about 20 psig.
- FIG. 6 shows the measured conductivity of the various streams in the water treatment system, against run time.
- Tables 3 and 4 summarize the measured properties of the various streams of the water treatment system at the start and end of the test, respectively.
- the data presented in Table 3 showed that the initial feed stream, labeled as tankout conductivity in FIG. 6 , into electrodeionization device 16 with a conductivity of about 412 ⁇ S/cm was treated to produce an initial dilute stream, labeled as stackout conductivity in FIG. 6 , having a conductivity of about 312 ⁇ S/cm, without a substantial pH change.
- water having a conductivity of about 221 ⁇ S/cm was treated to produce lower conductivity water of about 164 ⁇ S/cm without a substantial pH change.
- Example 2 shows that the treatment system of the present invention, schematically illustrated in FIG. 5 , can treat water that is suitable for household or residential use.
- TABLE 3 Stream properties at the start of the test run. Feed Stream Reject Stream Product Stream pH 8.19 8.3 8.02 Conductivity 412 944.9 312.0 ( ⁇ S/cm)
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Abstract
Description
- 1. Field of the Invention
- The present invention relates generally to a system and method of treating or purifying a fluid and, more particularly, to a water treatment system incorporating an electrochemical device with a reservoir system for delivering treated water to a point of use.
- 2. Description of Related Art
- Water that contains hardness species such as calcium and magnesium may be undesirable for some uses in industrial, commercial and household applications. The typical guidelines for a classification of water hardness are: zero to 60 milligrams per liter (mg/l) as calcium carbonate is classified as soft; 61 to 120 mg/l as moderately hard; 121 to 180 mg/l as hard; and more than 180 mg/l as very hard.
- Hard water can be treated by removing the hardness ion species. Examples of systems that remove such species include those that use ion exchange beds. In such systems, the hardness ions become ionically bound to oppositely charged ionic species that are mixed on the surface of the ion exchange resin. The ion exchange resin eventually becomes saturated with ionically bound hardness ion species and must be regenerated. Regeneration typically involves replacing the bound hardness species with more soluble ionic species, such as sodium chloride. The hardness species bound on the ion exchange resin are replaced by the sodium ions and the ion exchange resins are ready again for a subsequent water softening step.
- Other systems have been disclosed. For example, Dosch, in U.S. Pat. No. 3,148,687 teaches a washing machine including a water softening arrangement using ion exchange resins. Similarly, Gadini et al., in International Application Publication No. WO00/64325, disclose a household appliance using water with an improved device for reducing the water hardness. Gadini et al. teach of a household appliance having a control system, a water supply system from an external source and a softening system with an electrochemical cell. McMahon, in U.S. Pat. No. 5,166,220, teaches of a regeneration of ion exchange resin with a brine solution in a water softening process.
- Systems and techniques that utilize electrodeionization (EDI) can be used to demineralize, purify or treat water. EDI is a process that removes ionizable species from liquids using electrically active media and an electrical potential to influence ion transport. The electrically active media may function to collect and discharge ionizable species, or to facilitate the transport of ions by ionic or electronic substitution mechanisms. EDI devices can include media having permanent or temporary charge and can be operated to cause electrochemical reactions designed to achieve or enhance performance. These devices may also include electrically active membranes such as semi-permeable ion exchange or bipolar membranes.
- Continuous electrodeionization (CEDI) is a process that relies on ion transport through electrically active media or electroactive media. A typical CEDI device includes alternating electroactive semi-permeable anion and cation selective membranes. The spaces between the membranes are configured to create liquid flow compartments with inlets and outlets. A transverse DC electrical field is imposed by an external power source through electrodes at the bounds of the compartments. In some configurations, electrode compartments are provided so that reaction product from the electrodes can be separated from the other flow compartments. Upon imposition of the electric field, ions in the liquid to be treated in one compartment, the ion-depleting compartment, are attracted to their respective attracting electrodes. The ions migrate through the selectively permeable membranes into the adjoining compartments so that the liquid in the adjoining ion-concentrating compartments become ionically concentrated. The volume within the depleting compartments and, in some embodiments, within the concentrating compartments, includes electrically active media. In CEDI devices, the electroactive media may include intimately mixed anion and cation exchange resin beads. Such electroactive media typically enhances the transport of ions within the compartments and may participate as a substrate for controlled electrochemical reactions. Electrodeionization devices have been described by, for example, Giuffrida et al. in U.S. Pat. Nos. 4,632,745, 4,925,541, and 5,211,823, by Ganzi in U.S. Pat. Nos. 5,259,936 and 5,316,637, by Oren et al. in U.S. Pat. No. 5,154,809 and by Kedem in U.S. Pat. No. 5,240,579.
- Other systems that can be used to demineralize water have been described. For example, Gaysowski, in U.S. Pat. No. 3,407,864, teaches of an apparatus that involves both ion exchange and electrodialysis. Johnson, in U.S. Pat. No. 3,755,135, teaches of a demineralizing apparatus using a DC potential.
- The present invention is directed to a water purification or treatment system comprising a pressurized reservoir system fluidly connected to a point of entry, a water treatment device fluidly connected to the pressurized reservoir system, a water distribution system fluidly connected to the pressurized reservoir system and at least one point of use fluidly connected to the water distribution system.
- In another aspect of the present invention, a treatment system is provided comprising a reservoir system fluidly connected to a point of entry, an electrochemical device fluidly connected to the reservoir system, a point of use fluidly connected to the reservoir system, and an auxiliary use fluidly connected downstream of the electrochemical device.
- In another aspect of the present invention, a method is provided for treating water comprising introducing water to a pressurized reservoir system, transferring a portion of the water from the pressurized reservoir system to a water treatment device, removing at least a portion of any undesirable species from the water from the pressurized reservoir system in the water treatment device to produce a treated water, transferring the treated water from the water treatment device to the pressurized reservoir system and distributing a portion of the treated water from the pressurized reservoir system to a point of use.
- In another aspect of the present invention, a method is provided for treating water comprising introducing water from a point of use to a reservoir system, removing at least a portion of any undesirable species from the water in the reservoir system in an electrochemical device to produce treated water and discharge water, transferring at least a portion of the treated water from the electrochemical device to the reservoir system, transferring a portion of the discharge water to an auxiliary use, and distributing a portion of the treated water from the reservoir system to a point of use.
- In another aspect of the present invention, a water distribution system is provided comprising a first pretreatment system fluidly connected to a point of entry, a pressurized reservoir system fluidly connected downstream of the first pretreatment system, a second pretreatment system fluidly connected to the pressurized reservoir system and an electrochemical device fluidly connected downstream of the second pretreatment system and to the pressurized reservoir system.
- In another aspect of the present invention, a water treatment system is provided comprising means for accumulating water from a water source at a pressure above atmospheric pressure and an electrochemical device fluidly connected to the means for accumulating water.
- In another aspect of the present invention, a method is provided for treating water comprising mixing water from a point of entry with a treated water to produce a mixed water, removing a portion of any undesirable species from a portion of the mixed water in an electrochemical device to produce the treated water and distributing a portion of the mixed water to a point of use.
- In another aspect of the present invention, a method is provided for treating water comprising accumulating water from a point of use, removing at least a portion of any undesirable species from the water in an electrochemical device to produce treated water, and supplying at least a portion of the treated water to a household.
- In another aspect of the present invention, a method is provided for treating water comprising accumulating water from a point of use at a pressure that is above atmospheric pressure, providing an electrochemical device electrochemical device, transferring at least a portion of the accumulated water to the electrochemical device, removing at least a portion of any undesirable species from the water in the electrochemical device to produce a treated water, and adjusting at least one operating parameter of the electrochemical device.
- In another embodiment, the present invention provides a system comprising a fluid reservoir in thermal communication with a heat exchanger and a fluid treatment device fluidly connected to the fluid reservoir.
- In another embodiment, the present invention provides a method for facilitating water treatment. The method can comprises providing a system comprising a pressurizable reservoir system that is fluidly connectable to a point of entry and an electrochemical device fluidly connected to the pressurizable reservoir system and fluidly connectable to a water distribution system.
- Other advantages, novel features and objects of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings, which are schematic and are not intended to be drawn to scale. In the figures, each identical or substantially similar component that is illustrated in various figures is represented by a single numeral or notation. For purposes of clarity, not every component is labeled in every figure, nor is every component of each embodiment of the invention shown where illustration is not necessary to allow those of ordinary skill in the art to understand the invention.
- Preferred, non-limiting embodiments of the present invention will be described by way of example and with reference to the accompanying drawings, in which:
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FIG. 1 is a process flow diagram of a water treatment system showing an in-line system with a pressurized reservoir system and a treatment device in accordance with one or more embodiments of the invention; -
FIG. 2 is a schematic, sectional view through a typical electrochemical device in accordance with one or more embodiments of the present invention, illustrating the fluid and ion flow directions through depleting and concentrating compartments; -
FIG. 3 is a schematic flow diagram of a water treatment system in accordance with one or more embodiments of the invention as discussed in Example 1; -
FIG. 4 is a graph showing conductivity of water treated in the water treatment system exemplarily illustrated inFIG. 3 and discussed in Example 1; -
FIG. 5 is a schematic flow diagram of a water treatment system in accordance with one or more embodiments of the invention as discussed in Example 2; and -
FIG. 6 is a graph showing conductivity of water treated in the water treatment system exemplarily illustrated inFIG. 5 and discussed in Example 2. - United States patent applications titled WATER TREATMENT SYSTEM AND METHOD by Wilkins et al. and filed on even date herewith; WATER TREATMENT SYSTEM AND METHOD by Ganzi et al. and filed on even date herewith; WATER TREATMENT SYSTEM AND METHOD by Freydina et al. and filed on even date herewith; WATER TREATMENT SYSTEM AND METHOD by Wilkins et al. and filed on even date herewith; WATER TREATMENT SYSTEM AND METHOD by Freydina et al. and filed on even date herewith; WATER TREATMENT SYSTEM AND METHOD by Wilkins et al. and filed on even date herewith; and WATER TREATMENT SYSTEM AND METHOD by Jha et al. and filed on even date herewith are hereby incorporated by reference herein.
- The present invention is directed to a water treatment or purification system and method of providing treated water in industrial, commercial and residential settings. The treatment system can provide treated water to a point of use by removing at least a portion of any hardness-causing species contained in water from a water source, such as municipal water, well water, brackish water and water containing foulants. Other applications of the system would be in the treatment and processing of foods and beverages, sugars, various industries, such as the chemical, pharmaceutical, food and beverage, wastewater treatments and power-generating industries. The present invention will be described using water as the fluid but should not be limited as such. For example, where reference is made to treated water, it is believed that other fluids can be treated according to the present invention. Moreover, where reference is made to a component of the system or to the method of the present invention that adjusts, modifies, measures or operates on water or water property, the present invention is believed to be applicable as well. Thus, the fluid to be treated may be a fluid that is a mixture comprising water. Accordingly, the fluid can be a liquid that can comprise water.
- The water purification or treatment system in accordance with one or more embodiments of the present invention typically receives water from the water source or a point of entry and purifies the water containing at least some undesirable species before delivering the treated water to a point of use. The treatment system typically has a reservoir system in line with a water purification or treatment apparatus such as, but not limited to, an electrodeionization device, a reverse osmosis device, an electrodialysis device, a capacitive deionization device, a microfiltration device, and/or an ultrafiltration device. The treatment system, in some embodiments of the present invention, further comprises a sensor for measuring at least one property of the water or an operating condition of the treatment system. In other embodiments, the treatment system also includes a controller for adjusting or regulating at least one operating parameter of the treatment system or a component of the treatment system.
-
FIG. 1 shows a schematic flow diagram of a treatment system according to one embodiment of the present invention.Treatment system 10 includes areservoir system 12 fluidly connected, typically, to a liquid source or a point ofentry 14 and to a purification ortreatment device 16, typically downstream of the point of entry.Treatment system 10 typically includes a point ofuse 18, which is typically fluidly connected downstream ofreservoir system 12. In certain embodiments,treatment system 10 also has asensor 20 and acontroller 22 for controlling or regulatingpower source 24 which provides power totreatment device 16.Treatment device 16 typically removes at least a portion of any undesirable species from the liquid to be treated, flowing from point ofentry 14, to produce treated liquid, such was treated water, for storage inreservoir system 12 and ultimate delivery to point ofuse 18. Undesirable species removed bytreatment device 16 can be transferred to an auxiliary use or adrain 26. - In certain embodiments of the present invention,
treatment system 10, as, for example, a water treatment system, further includespretreatment system 28, which is typically fluidly connected upstream ofreservoir system 12 ortreatment device 16. Moreover,treatment system 10 typically also includes one or more fluid control components, such aspump 30 andvalve 32. - The present invention will be further understood in light of the following definitions. As used herein, “pressurized” refers to a system or component that has a pressure, internal or applied, that is above atmospheric pressure. For example,
pressurized reservoir system 12 has an internal pressure that is greater than atmospheric pressure. Pressure in the pressurized reservoir system can be created by various methods and techniques, for example, by pressurizing the water with a water pump or by elevating the water source, thus creating head pressure. Furthermore, where reference is made to “treated” water or fluid, the treated water can be softened water, low Langelier Saturation Index (LSI) water or low conductivity water. As used herein, low LSI water has a LSI of less than about 2, preferably, less than about 1, and more preferably, less than about zero. As used herein, the phrase “treatment device” or “purification device” or apparatus pertains to any apparatus that can be used to remove or reduce the concentration any undesirable species from a fluid to be treated. Such treatment apparatus include, but are not limited to, those that rely on techniques such as ion-exchange resin reverse osmosis, electrodeionization, electrodialysis, ultrafiltration, microfiltration, capacitive deionization. Further, where reference is made to an electrochemical device, such as “electrodeionization device 16,” such reference is meant to be exemplary and other electrochemical devices such as, but not limited to, electrodeionization devices, electrodialysis devices, and, in some cases, capacitive deionization devices, may be used in accordance with the principles of the present invention as long as such use is not inconsistent or contrary to operation of such devices and/or the techniques of the present invention. Although a number of apparatus may be used as a treatment device, the applicability of such apparatus is not intended to imply that each or all of the apparatus utilize the same principles but that such apparatus may be used, alone or in combination, as a treatment device in accordance with one or more systems and techniques of the present invention. -
FIG. 2 schematically shows a cross-sectional view of fluid and ion flow paths through one embodiment of an electrodeionization device of the present invention. The electrodeionization module ordevice 16 includes ion-depleting (depleting) compartments 34 and ion-concentrating (concentrating) compartments 36, positioned between depletingcompartments 34. Depletingcompartments 34 are typically bordered by ananolyte compartment 38 and acatholyte compartment 40. Typically, end blocks (not shown) are positioned adjacent to end plates (not shown) to house ananode 42 and acathode 44 in the respective compartments. In certain embodiments, the compartments include cation-selective membranes 46 and anion-selective membranes 48. The cation-selective membranes and anion-selective membranes typically comprise ion exchange powder, a polyethylene powder binder and a glycerin lubricant. - In accordance with one or more embodiments of the present invention, the cation- and anion-selective membranes are typically heterogeneous polyolefin-based membranes, which are typically extruded by a thermoplastic process using heat and pressure to create a composite sheet. However, the present invention contemplates the use of the other types of membranes including homogeneous membranes. Representative suitable ion-selective membranes include, for example, web supported using styrene-divinyl benzene with sulphonic acid or quaternary ammonium functional groups, web supported using styrene-divinyl benzene in a polyvinylidene fluoride binder, and unsupported-sulfonated styrene and quarternized vinyl benzyl amine grafts on polyethylene sheet.
- Concentrating
compartments 36 are typically filled with electroactive media such as cationexchange resin beads 50 and depletingcompartments 34 are typically filled with a mixture of cationexchange resin beads 50 and anionexchange resin beads 52. In some embodiments, the cation exchange and anion exchange resin beads can be arranged in layers within any of the depleting, concentrating and electrode compartments so that a number of layers in a variety of arrangements can be assembled. Other configurations and/or arrangements are believed to be within the scope of the invention including, for example, the use of mixed bed ion exchange resin beads in any of the depleting, concentrating and electrode compartments, the use of inert resin between layer beds of anionic and cationic exchange resin beads, the use of various types and arrangements of anionic and cationic resin beads including, but not limited to, those described by DiMascio et al., in U.S. Pat. No. 5,858,191, which is incorporated herein by reference in its entirety. - In operation, a liquid to be treated 54, typically from an upstream water source entering the treatment system at point of
entry 14, having dissolved cationic and anionic components, including hardness ion species, can be introduced into depletingcompartments 34 throughmanifold 60, wherein the cationic components are typically attracted to the cationexchange resin beads 50 and the anionic components are attracted to the anionexchange resin beads 52. An electric field applied acrosselectrodeionization device 16, throughanode 42 andcathode 44, which are typically positioned on opposite ends ofelectrodeionization device 16, typically passes perpendicularly relative to the fluid flow direction. Under the influence of the electric field, cationic and anionic components in the liquid tend to migrate in a direction corresponding to their attracting electrodes. Cationic components can migrate through cation-selective membrane 46 into adjacent concentratingcompartment 36. - Anion-
selective membrane 48, positioned on the opposite side of concentratingcompartment 36, prevents migration into adjacent compartments, thereby trapping the cationic components in the concentrating compartment. Similarly, anionic components migrate through the ion-selective membranes, but in a direction that is opposite relative to the migration direction of the cationic components. Anionic components migrate through anion-selective membrane 48, from depletingcompartment 34, into adjacent concentratingcompartment 36. Cation-selective membrane 46, positioned on the other side of concentratingcompartment 36, prevents further migration, thus trapping anionic components in the concentrating compartment. In net effect, ionic components are removed or depleted from the liquid 54 flowing in depletingcompartments 34 and collected in concentratingcompartments 36 resulting in a treatedwater product stream 56 and a concentrate orwaste stream 58. - In accordance with some embodiments of the present invention, the applied electric field on
electrodeionization device 16 creates a polarization phenomenon, which typically leads to the dissociation of water into hydrogen and hydroxyl ions. The hydrogen and hydroxyl ions regenerate the ionexchange resin beads compartments 34 and in some embodiments, concentratingcompartments 36, so that removal of dissolved ionic components can occur continuously and without a separate step for regenerating exhausted electroactive media. - The applied electric field on
electrodeionization device 16 is typically a direct current. However, any applied electric current that creates a bias or a potential difference between one electrode and another can be used to promote migration of ionic species by, for example, ionic attraction. Therefore, an alternating current may be used, provided that there is a potential difference between electrodes that is sufficient to attract cationic and anionic species to the respective attracting electrodes. In yet another embodiment, an alternating current may be rectified, for example, by using a diode or a bridge rectifier, to convert an alternating current to a pulsating current with sufficient potential to attract the charged species. - The electroactive media, ion
exchange resin beads compartments 34, can have a variety of functional groups on their surface regions including, but not limited to, tertiary, alkyl amino groups and dimethyl ethanolamine. These materials can also be used in combination with materials having various functional groups on their surface regions, such as quaternary ammonium groups. Other modifications and equivalents of the electrodeionization device, as part of the water treatment system disclosed, will occur to persons skilled in the art using no more than routine experimentation. For example, various other types of electroactive media may be used such as heterogeneous and homogeneous types. Similarly, other variations in arrangements of depleting and concentrating compartments are believed to be within the scope and spirit of the invention. -
Reservoir system 12 serves to store or accumulate water from point ofentry 14 or a water source and can also serve to store treated water fromproduct stream 56 fromelectrodeionization device 16 and can also provide water, typically treated water, or treated water mixed with water from point ofentry 14, to point ofuse 18 through a distribution system. - In accordance with some embodiments of the present invention,
reservoir system 12 comprises a pressurized vessel or a vessel that has inlets and outlets for fluid flow such as aninlet 62 and anoutlet 64.Inlet 62 is typically fluidly connected to point ofentry 14 andoutlet 64 is typically fluidly connected to a water distribution system or a point ofuse 18.Reservoir system 12 can have several vessels, each vessel, in turn, can have several inlets positioned at various locations. Similarly,outlet 64 can be positioned on each vessel at various locations depending on, among other things, demand or flow rate to point ofuse 18, capacity or efficiency ofelectrodeionization device 16 and capacity or hold-up ofreservoir system 12.Reservoir system 12 can further comprise various components or elements that perform desirable functions or avoid undesirable consequences. For example,reservoir system 12 can have vessels having internal components, such as baffles that are positioned to disrupt any internal flow currents within the vessels ofreservoir system 12. In some embodiments,reservoir system 12 has a heat exchanger for heating or cooling the fluid. For example,reservoir system 12 can comprise a vessel with a heating coil, which can have a heating fluid at an elevated temperature relative to the temperature of the fluid in the vessel. The heating fluid can be hot water in closed-loop flow with a furnace or other heating generating unit operation so that the heating fluid temperature is raised in the furnace. The heating fluid, in turn, raises the vessel fluid temperature by heat transfer. Other examples of auxiliary or additional components include, but are not limited to, pressure relief valves designed to relieve internal pressure of any vessels and avoid or at least reduce the likelihood of vessel rupture and thermal expansion tanks that are suitable for maintaining a desired operating pressure. The size and capacity of the thermal expansion tank will depend on factors including, but not limited to, the total volume of water, the operating temperature and pressure of the reservoir system. - In accordance with one or more embodiments of the present invention, the reservoir system is connected in or in thermal communication with the heat exchanger and, optionally, to a fluid treatment device. The fluid treatment device can be an electrodeionization device, a reverse osmosis device, an ion-exchange resin bed, an electrodialysis device, a capacitive deionization device, or combinations thereof.
- In operation,
reservoir system 12 is typically connected downstream of point ofentry 14 and fluidly connected in-line, such as in a circulation loop, withelectrodeionization device 16. For example, water from point ofentry 14 can flow intoinlet 62 and can mix with the bulk water contained withinreservoir system 12. Bulk water can exitreservoir system 12 throughoutlet 64 and can be directed to point ofuse 18 or throughpump 30 intoelectrodeionization device 16 for treatment or removal of any undesirable species. Treated water leavingelectrodeionization device 16 can mix with water from point ofentry 14 and enterreservoir system 12 throughinlet 62. In this way, a loop can be formed betweenreservoir system 12 andelectrodeionization device 16 and feedwater from point ofentry 14 can replenish water demand created by and flowing to point ofuse 18. - Point of
entry 14 provides or connects water from a water source to the water treatment system. The water source can be a potable water source, such as municipal water source or well water or it can be a non-potable water source, such as a brackish or salt-water source. In some instances, an intermediate treatment or treatment system typically purifies the water for human consumption before it reaches point ofentry 14. The water typically contains dissolved salts or ionic or ionizable species including sodium, chloride, chlorine, calcium ions, magnesium ions, carbonates, sulfates or other insoluble or semi-soluble species or dissolved gases, such as silica and carbon dioxide. Moreover, the water can contain additives, such as fluoride, chlorate and bromate. - In accordance with another embodiment of the present invention,
treatment system 10 includes a fluid distribution system (not shown), which in turn connects to a point of use. The distribution system can comprise components that are fluidly connected to provide, for example, water, typically treated water, fromreservoir system 12 to point ofuse 18. The distribution system can comprise any arrangement of pipes, valves, tees, pumps and manifolds to provide water fromreservoir system 12 to one or several points ofuse 18 or to any component oftreatment system 10. In one embodiment, the distribution system comprises a household or residential water distribution system including, but not limited to, connections to one or more points of use such, but not limited to, a sink faucet, a shower head, a washing machine and a dishwasher. For example,system 10 may be connected to the cold or hot, or both, water distribution system of a household. - Point of
use 18 is typically any device or appliance that requires or demands water. For example, point ofuse 18 can be an appliance, such as a washing machine or a dishwasher, or can be a faucet serving to provide water to a kitchen sink or a showerhead. In another embodiment, point ofuse 18 comprises a system for providing water suitable for household or residential use. - In accordance with another embodiment of the present invention,
water treatment system 10 also comprises a sensor, such as a water property sensor, which measures at least one physical property intreatment system 10. For example,sensor 20 can be a device that can measure water conductivity, pH, temperature, pressure, composition or flow rate.Sensor 20 can be installed or positioned withintreatment system 10 to measure a particularly preferred water property. For example,sensor 20 can be a water conductivity sensor installed inreservoir system 12 so thatsensor 20 measures the conductivity of the water, which can provide an indication of the quality of the water available for service in point ofuse 18. In another embodiment,sensor 20 can comprise a series or a set of sensors in any various configurations or arrangements intreatment system 10. The set of sensors can be constructed, arranged or connected tocontroller 22 so thatcontroller 22 can monitor, intermittently or continuously, the quality of water in, for example,reservoir system 12. In such an arrangement, the performance oftreatment system 10 can be optimized as described below. Other embodiments may comprise a combination of sets of sensors in various locations throughouttreatment system 10. For example,sensor 20 can be a flow sensor measuring a flow rate to a point ofuse 18 and further include any of a pH meter, nephelometer, composition analyzer, temperature and pressure sensor monitoring the operating condition oftreatment system 10. - In accordance with another embodiment of the present invention,
water treatment system 10 can further comprise apretreatment system 28 designed to remove a portion of any undesirable species from the water before the water is introduced to, for example,reservoir system 12 or theelectrodeionization device 16. Examples of pretreatment systems include, but are not limited to, reverse osmosis devices, which are typically used to desalinate brackish or salt water. A carbon or charcoal filter may be used to remove at least a portion of any chlorine, including active chlorine, or any species that may foul or interfere with the operation ofelectrodeionization device 16.Pretreatment system 28 can be positioned anywhere withinwater treatment system 10. For example,pretreatment system 28 can be positioned upstream ofreservoir system 12 or downstream ofsystem 12 but upstream ofelectrodeionization device 16 so that at least some chlorine species are retained inreservoir system 12 but are removed before water enterselectrodeionization device 16. In accordance with further embodiments of the present invention, disinfecting and/or cleaning apparatus or systems may be utilized with the treatment system. Such disinfecting or cleaning system can comprise any apparatus that destroys or renders inactive, at least partially, any microorganisms, such as bacteria, that can accumulate in any component of the treatment system. Examples of such cleaning or disinfecting systems include those that can introduce a disinfectant or disinfecting chemical compounds, such as halogens, halogen-donors, acids or bases, as well as systems that expose wetted components of the treatment system to hot water at a temperature capable of sanitization. In accordance with still further embodiments, of the present invention, the treatment system can include final stage or post treatment systems or subsystems that provide final purification of the fluid prior to delivery at a point of use. Examples of such post treatment systems include, but are not limited to those that expose the fluid to actinic radiation or ultraviolet radiation, and/or ozone or remove undesirable compounds by micro filtration or ultrafiltration. Thus, in accordance with one or more embodiments of the present invention, the treatment system may be utilized for household service and installed, for example, under a sink and provide treated water, which is treated by exposure to ultraviolet radiation, before being delivered to a point of use, such as a faucet. - In accordance with other embodiments of the present invention,
treatment system 10 can further comprise acontroller 22 that is capable of monitoring and regulating the operating conditions oftreatment system 10 and its components.Controller 22 typically comprises a microprocessor-based device, such as a programmable logic controller (PLC) or a distributed control system that receives or sends input and output signals to components oftreatment system 10. In one embodiment,controller 22 can comprise a PLC that sends a signal topower source 24, which supplies power toelectrodeionization device 16 or can provide a signal to a motor control center that provides power to pumps 30. In certain embodiments,controller 22 regulates the operating conditions ofwater treatment system 10 in open-loop or closed-loop control scheme. For example,controller 22, in open-loop control, can provide signals to the water treatment system such that water is treated without measuring any operating condition.Controller 22 can control the operating conditions in closed-loop control so that operating parameters can be adjusted depending on an operating condition measured by, for example,sensor 20. In yet another embodiment,controller 22 can further comprise a communication system such as a remote communication device for transmitting or sending the measured operating condition or operating parameter to a remote station. - In accordance with another embodiment of the present invention,
controller 22 can provide a signal that actuates avalve 32 intreatment system 10 so that fluid flow intreatment system 10 is adjusted based on a variety of parameters including, but not limited to, the quality of water from point ofentry 14, the quality of water to point ofuse 18, the demand or quantity of water to point ofuse 18, the operating efficiency or capacity ofelectrodeionization device 16, or any of a variety of operating conditions, such as the water conductivity, pH, turbidity, composition, temperature, pressure and flow rate. In one embodiment,controller 22 receives signals fromsensor 20 so thatcontroller 22 is capable of monitoring the operating parameters oftreatment system 10. For example,sensor 20 can be a water conductivity sensor positioned withinreservoir system 12 so that the water conductivity inreservoir system 12 is monitored bycontroller 22.Controller 22 can, based on, for example, the water quality measured bysensor 20,control power source 24, which provides an electric field toelectrodeionization device 16. So, in operation,controller 22 can increase or decrease or otherwise adjust the voltage and current or both supplied frompower source 24 toelectrodeionization device 16.Controller 22 typically includes algorithms that can change an operating parameter oftreatment system 10 based on one or more measured properties of the liquid flowing in the system. Thus, in some embodiments of the present invention,controller 22 can increase or decrease or otherwise adjust the period between operating cycles ofelectrodeionization device 16, such as, but not limited to, cycles of reversing applied electric field and the associated fluid flow. - In accordance with another embodiment of the invention,
controller 22 can reverse the direction of the applied current frompower source 24 toelectrodeionization device 16 according to a predetermined schedule or according to an operating condition, such as the water quality or any other operating parameter. Polarity reversal has been described by, for example, Giuffrida et al., in U.S. Pat. No. 4,956,071, which is incorporated herein by reference in its entirety. -
Controller 22 can be configured or configurable by programming or can be self-adjusting such that it is capable of maximizing, for example, any of the service life and the efficiency of or reducing the operating cost oftreatment system 10. For example,controller 22 can comprise a microprocessor having user-selectable set points or self-adjusting set points that adjusts the applied voltage and current to electrodeionizationdevice 16, the flow rate through the concentrating and depleting compartments of the electrodeionization device or the discharge flow rate to drain 26 from the electrodeionization device or the pretreatment system or both. Other modifications and equivalents of the controller, as part of the water treatment system disclosed, will occur to persons skilled in the art using no more than routine experimentation. For example, the use of adaptive, self-adjusting, or self-diagnosing controllers capable of changing the operating parameters based on a variety of input parameters such as rate of water use or time of water use, are believed to be within the scope and spirit of the invention. - In accordance with another embodiment of the present invention,
controller 22 can calculate a control parameter that can be used to adjust or vary a control signal to a component of the water treatment system. For example,controller 22 can calculate a LSI based on the measured operating conditions of the streams of the water treatment system. LSI can then be used in another or the same control loop, in the same or another controller, as an input variable that can be compared to a set-point and generate an output signal that actuates, adjusts or otherwise regulates a component of the water treatment system. LSI can be calculated according to, for example, ASTM D 3739. -
Controller 22 can incorporate dead band control to reduce the likelihood of unstable on/off control or chattering. Dead band refers to the range of signal outputs that a sensor provides without necessarily triggering a responsive control signal. The dead band may reside, in some cases, intrinsically in the sensor or may be programmed as part of the control system, or both. Dead band control can avoid unnecessary intermittent operation by smoothing out measurement excursions. Such control techniques can prolong the operating life or mean time before failure of the components oftreatment system 10. Other techniques that can be used include the use of voting, time-smoothing or time-averaging measurements or combinations thereof. - In accordance with another embodiment of the present invention, discharge water, typical from
waste stream 58, to auxiliary use can serve or provide additional or secondary benefits. For example,waste stream 58, rather than going to drain 26, may be used to provide, for example, irrigating water to any residential, commercial or industrial use, such as for irrigating, for recycling or for recovery of collected or concentrated salts. In yet another embodiment, the treatment system includes a mixing system that is fluidly connected to at least one of the distribution system and the reservoir system. The mixing or blending system can include a fluid connection in the distribution system as well as a fluid connection to the point of entry. The mixing system can provide fluid mixing of, for example, untreated water with treated water to produce service water that can be used at the point of use. The mixing system can include at least one a tee and a mixing tank, or both, that fluidly connects an outlet of the reservoir system and the point of entry. The mixing system, in some cases, can include a valve that regulates the flow of any of the untreated water stream and the treated water stream flowing to the point of use. In another embodiment, the valve can be a proportional valve that mixes the treated water with untreated water according to a predetermined ratio. In another embodiment, the valve can be actuated by the controller depending on any of the flow rate, the water property and the particular service associated with the point of use. For example, if a low hardness water is required by the point of use, then the controller can regulate the amount of untreated water, if any, that can be mixed with treated water by actuating a valve, which regulates the flow rate of the untreated water, in closed-loop control with a sensor measuring the conductivity of the mixed water stream. In another embodiment, the valve can regulate the flow rate of the treated water that would be mixed with the untreated water according to the requirements of the point of use. In another embodiment, the treatment device can be operated to reach a set-point that is lower than any required by various points of use so that any mixing of treated water with untreated water can produce service water that satisfies the particular requirements of each point of use. Those of ordinary skill should recognize that the present the treatment system can be adjustable to accommodate fluctuations in demand as well as variations in water quality requirements. For example, the present invention can provide a water treatment system that can produce low LSI water, which would be available to the system as a whole, during extended idle periods. The low LSI water, in some embodiments, can be used to flush the wetted components of the treatment system, which can reduce the likelihood of scaling and should increase the service life of the components, individually, as well as the treatment system as a whole. In accordance with some embodiments, the present invention provides a system for producing treated liquids, such as water, having a low conductivity. As used herein, a low conductivity liquid has a conductivity of less than about 300 μS/cm, preferably less than about 220 μS/cm and more preferably, less than about 200 μS/cm. - The treatment system can comprise a fluid circuit that can provide treated or, in some cases, softened water or, in other cases, low conductivity water or low LSI water, to an electrode compartment of the treatment device such as an electrodeionization device. The fluid circuit can comprise fluid connections from a treated water source to the electrode compartments of the electrodeionization device. The fluid circuit can also comprise a pretreatment unit, such as a carbon filter that can remove any species, such as chlorine, which can interfere with the operation of the electrodeionization device. The fluid circuit can also include fluid connections to at least one of the depleting and the concentrating compartments of the electrodeionization device, for example, downstream of the pretreatment unit. The fluid circuit connections, in accordance with one or more embodiments of the present invention provides connections so that fluid exiting the electrode compartments can be, for example, mixed together or mixed with fluid to be treated in the depleting compartment. The fluid circuit can also comprise pumps and valves that can direct fluid flow to and from the electrodeionization device as well as to and from the reservoir system. In some cases, the fluid circuit is arranged to provide fluid connections that creates parallel flow paths through the electrode compartments of the electrodeionization device. Other arrangements and configurations are considered to be within the scope of the present invention including, for example, serial flow paths from one electrode compartment to the other, the use of single, multiple or dedicated pretreatment units as well as multiple or staged treatment units including, but not limited to, reverse osmosis, ion exchange and electrodeionization devices, or combinations thereof, in the fluid circuit.
- The treatment system can comprise a fluid circuit that provides fluid connections from a depleting compartment to at least one electrode compartment of the electrodeionization device. Such an arrangement can provide treated water, preferably water having low LSI or low conductivity, or both, to the electrode compartment. The fluid circuit can be arranged so that the fluid flow paths can be in series or in parallel through the electrode compartments. The fluid circuit can also comprise fluid connections to allow the fluid that would exit the electrode compartment to be delivered to a point of use via, for example, a water distribution system or to a reservoir system, or to both. In some arrangements, the fluid circuit can comprise fluid connections so that untreated fluid can be mixed with fluid that would exit any of electrode compartments; the mixture can be delivered to the point of use. In another embodiment, the fluid circuit can further comprise fluid connections to and from a reservoir system so that, for example, treated fluid that would exit the depleting compartment can be transferred to the reservoir system and mixed with untreated fluid from the point of entry and the mixture can be delivered to the point of use and, optionally, to the electrode compartments of the electrodeionization device in parallel or series flow paths. Other arrangements and combinations including, for example, the mixing of treated and untreated water to produce a mixed electrode compartment flushing fluid is considered to be within the scope of the present invention.
- The present invention will be further illustrated through the following examples, which are illustrative in nature and are not intended to limit the scope of the invention.
- An in-line pressurized water treatment system in accordance with one or more embodiments of the systems and techniques of the present invention, schematically shown in
FIG. 3 , was evaluated for performance. Thewater treatment system 10 had anelectrodeionization module 16 with a pretreatment system (not shown) and apressurized storage vessel 12. Water, from point ofentry 14, was introduced intopressurized vessel 12 and was circulated throughelectrodeionization module 16. The water treatment system was controlled by a programmable controller (not shown) based on a measured water conductivity, as measured bysensors 20 b and 20 c, upstream of aninlet 62 and downstream of anoutlet 64 ofpressurized vessel 12. -
Electrodeionization device 16 comprised of a 10-cell pair stack with 13-inch flowpaths. Each cell was filled with about 40% AMBERLITE® SF 120 resin and about 60% AMBERLITE® IRA 458 resin, both available from Rohm & Haas Company, Philadelphia, Pa. The electrodeionization device had an expanded titanium electrode, which was coated with ruthenium oxide. The pretreatment system comprised of an aeration type iron-filter with a 25-micron rating, a 20 inch×4 inch sediment filter and a 20 inch×4 inch carbon block filter.Pressurized vessel 12 was about a 10 inch diameter fiberglass vessel with about a 17-gallon capacity. The pressurized vessel was fitted with a valve head and a center manifold pipe. - The concentrate stream leaving the electrodeionization device was partially circulated and partially rejected to a
drain 26 by regulatingvalves entry 14, was fed into the circulating stream to compensate for any water that was rejected to drain 26 by actuatingvalves electrodeionization device 16 and was returned tovessel 12 through a return fluid circuit having a liquid conduit andvalves - The flow rate of treated water to a point of
use 18 fromoutlet 64 ofpressurized vessel 12 was regulated by adjustingvalve 32 a. Several sensors measuring operating conditions and water properties were installed throughoutwater treatment system 10 includingpressure indicators 20 d, 20 f, 20 g, 20 h and 20 i, flowrate indicators conductivity sensors - The controller was a
MICROLOGIX™ 1000 programmable controller available from Allen-Bradley Company, Inc., Milwaukee, Wis., which was used to control the valve sequencing as well as to monitor and record the operating conditions of the system. The controller fluidly isolated the electrodeionization device when a set-point was reached. The controller started the electrodeionization device depending on whether a flow switch signal triggered operation or when the water conductivity of the outlet stream leaving the pressurized vessel was higher than the set point. The feed from the electrodeionization device was circulated from the pressurized vessel via a second feed pump. The polarity of the electric field applied to the electrodeionization device was reversed by the controller every 15 minutes. - The water treatment system was operated until a set point was reached. The applied voltage to the electrodeionization device was about 50 volts. The flow rate through the electrodeionization device was maintained at about 2000 ml/min. Tables 1 and 2 summarize the measured properties of the various streams of the water treatment system at the start and end of the test, respectively. Notably, the data presented in Table 1 showed that the initial feed stream into
electrodeionization device 16, with a conductivity of about 462 μS/cm, was treated to produce an initial dilute stream having a conductivity of about 374 μS/cm without a substantial pH change. At the end of the run, feed water was treated from a conductivity of about 255 μS/cm to produce a dilute stream with a conductivity of about 158 μS/cm. Notably, the lower conductivity of the feed stream at the end of the test run reflected the effect of circulation, which effectively removed undesirable species over several passes.TABLE 1 Stream properties at the start of the test run. Feed Stream Reject Stream Dilute Stream pH 7.23 7.51 7.41 Conductivity 462 1394 374 (μS/cm) -
TABLE 2 Stream properties at the end of the test run. Feed Stream Reject Stream Dilute Stream pH 6.79 7.77 6.62 Conductivity 255 1024 158 (μS/cm) -
FIG. 4 shows the conductivity of the water along with the applied current through the electrodeionization device during the test run. The conductivity of the treated water from the electrodeionization device, labeled as dilute, was reduced to less than about 175 μS/cm in less than about 45 minutes.FIG. 4 also shows that the conductivity of the product stream, to service such as a point of use and labeled as tank outlet and dilute feed, was reduced to less than about 300 μS/cm. Furthermore,FIG. 4 shows that the applied current was reduced, as expected, with decreasing concentration of hardness species. Thus, the water treatment system of the present invention reduced the hardness, as measured by conductivity, by about 70% while delivering about 80 gallons per day. - An in-line pressurized water treatment system in accordance with one or more embodiments of the present invention, schematically shown in
FIG. 5 , was evaluated for performance. Thewater treatment system 10 had anelectrodeionization module 16 and apressurized storage vessel 12. Water, from point ofentry 14, was introduced intopressurized storage vessel 12 throughinlet 62 and was circulated usingpumps 30 a and 30 b and treated through pretreatment units 28 a and 28 b andelectrodeionization module 16. The water treatment system was controlled by a programmable controller (not shown) based on the measured water conductivity, as measured by sensors any of 20 a, 20 b, and 20 c. -
Electrodeionization device 16 comprised of a 10-cell pair stack with flowpaths that were about 7.5 inches long and about 2.5 inches wide. Each cell was filled with about 40% AMBERLITE® SF 120 resin and about 60% AMBERLITE® IRA 458 resin, both available from Rohm & Haas Company, Philadelphia, Pa. The electrodeionization device had an expanded titanium electrode coated with ruthenium oxide. - The controller was a
MICROLOGIX™ 1000 programmable controller available from Allen-Bradley Company, Inc., Milwaukee, Wis. The electrodeionization device was set to start up either by a flow switch signal or when the water conductivity of the outlet stream leaving the pressurized vessel was higher than a set point. The electrodeionization device operated until the conductivity reached the set point. The feed from the electrodeionization device was circulated from the pressurized vessel via a second feed pump. The polarity of the electric field applied to the electrodeionization device was reversed about every 15 minutes. In addition to controlling the components ofelectrodeionization device 16, the PLC collected, stored and transmitted measured data fromsensors -
Pressurized vessel 12 was a 10-inch diameter fiberglass vessel with a 30-gallon capacity.Pressurized vessel 12 was fitted with a valve head and a center manifold pipe. The concentrate stream leaving the electrodeionization device was partially circulated and partially rejected to adrain 26 by regulatingvalves entry 14, was fed into the circulating stream to compensate for any water that was rejected to drain 26. The pretreatment system comprised of an aeration iron-filter with a 25-micron rating, a 20 inch×4 inch sediment filter and a 20 inch×4 inch carbon block filter. - In the one flow direction, water from
pressure vessel 12 was pumped bypump 30 a, frompressure vessel 12 throughvalve 32 c, to pretreatment unit 28 a before being introduced to the depleting compartments (not shown) ofelectrodeionization device 16. Treated water fromelectrodeionization device 16 was directed byvalve 32 f to storage inpressure vessel 12. Fluid collecting removed ionic species was circulated by pump 30 b through pretreatment unit 28 b, the concentrating and electrode compartments (not shown) ofelectrodeionization device 16 andvalve 32 e. When the direction of the applied electric field was reversed, the flow directions were correspondingly adjusted so thatpump 30 a, pretreatment unit 28 a, andvalves electrodeionization device 16. Similarly, water to be treated was pumped frompressure vessel 12 using pump 30 b throughvalve 32 d to pretreatment unit 28 b before being introduced and treated in the depleting compartments ofelectrodeionization device 16. Fromelectrodeionization device 16, treated water was directed byvalve 32 e to flow intopressure vessel 12. - The flow rate of treated water, as measured by flow indicator 20 d, to a point of
use 18 fromoutlet 64 ofpressurized vessel 12 was regulated by adjustingvalves 32 a and 32 b. To discharge the concentrate stream, valve 32 g was operated as necessary. Water from point ofentry 14 was used to replace fluid that was discharged to drain 26. The water treatment system was operated until a target set point of about 220 μS/cm was reached and stable for about one minute. The applied voltage to the electrodeionization device was about 46 volts. The flow rates into the depleting and concentrating compartments were maintained at about 4.4 liters per minute. The reject flow rate was controlled to discharge about 270 ml of the concentrate stream about every 30 seconds. The pressure in the vessel was about 15 psig to about 20 psig. -
FIG. 6 shows the measured conductivity of the various streams in the water treatment system, against run time. Tables 3 and 4 summarize the measured properties of the various streams of the water treatment system at the start and end of the test, respectively. The data presented in Table 3 showed that the initial feed stream, labeled as tankout conductivity inFIG. 6 , intoelectrodeionization device 16 with a conductivity of about 412 μS/cm was treated to produce an initial dilute stream, labeled as stackout conductivity inFIG. 6 , having a conductivity of about 312 μS/cm, without a substantial pH change. Similarly, at the end of the test run, water having a conductivity of about 221 μS/cm was treated to produce lower conductivity water of about 164 μS/cm without a substantial pH change. - As similarly noted in Example 1, the lower conductivity of the feed stream at the end of the test run reflected the effect of circulation, which effectively removed undesirable species over several passes. Thus, this example shows that the treatment system of the present invention, schematically illustrated in
FIG. 5 , can treat water that is suitable for household or residential use.TABLE 3 Stream properties at the start of the test run. Feed Stream Reject Stream Product Stream pH 8.19 8.3 8.02 Conductivity 412 944.9 312.0 (μS/cm) -
TABLE 4 Stream properties at the end of the test run. Feed Stream Reject Stream Product Stream pH 8.37 8.33 7.75 Conductivity 221 833.8 164 (μS/cm) - Those skilled in the art would readily appreciate that all parameters and configurations described herein are meant to be exemplary and that actual parameters and configurations will depend upon the specific application for which the systems and methods of the present invention are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. For example, those skilled in the art may recognize that the present invention may further comprise a network of systems or be a component of a system such as a household or residential management system. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, the invention may be practiced otherwise than as specifically described. The present invention is directed to each individual feature, system, or method described herein. In addition, any combination of two or more such features, systems or methods, if such features, systems or methods are not mutually inconsistent, is included within the scope of the present invention.
Claims (70)
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TW93134566A TW200516059A (en) | 2003-11-13 | 2004-11-12 | Water treatment system and method |
PCT/US2004/037706 WO2005049510A2 (en) | 2003-11-13 | 2004-11-12 | Water treatment system and method |
EP04810774A EP1685071A2 (en) | 2003-11-13 | 2004-11-12 | Water treatment system and method |
US12/962,064 US8658043B2 (en) | 2003-11-13 | 2010-12-07 | Water treatment system and method |
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Cited By (69)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030089609A1 (en) * | 2001-10-15 | 2003-05-15 | United States Filter Corporation | Apparatus for fluid purification and methods of manufacture and use thereof |
US20050016932A1 (en) * | 2000-09-28 | 2005-01-27 | United States Filter Corporation | Electrodeionization device and methods of use |
US20050263457A1 (en) * | 2004-05-27 | 2005-12-01 | Wilkins Frederick C | Water treatment system and process |
US20060096920A1 (en) * | 2004-11-05 | 2006-05-11 | General Electric Company | System and method for conditioning water |
US20060157422A1 (en) * | 2003-11-13 | 2006-07-20 | Evgeniya Freydina | Water treatment system and method |
US20060231495A1 (en) * | 2005-04-13 | 2006-10-19 | Usfilter Corporation | Regeneration of adsorption media within electrical purification apparatuses |
US20060231406A1 (en) * | 2005-04-13 | 2006-10-19 | Usfilter Corporation | Regeneration of adsorption media within electrical purification apparatuses |
US20070215531A1 (en) * | 2006-03-17 | 2007-09-20 | Andreas Wawrla | Water-treatment appliance |
US7276155B1 (en) | 2006-05-04 | 2007-10-02 | Wastewater Technology, Inc. | Waste treatment apparatus with integral membrane apparatus |
US20070284252A1 (en) * | 2006-06-13 | 2007-12-13 | Ganzi Gary C | Method and system for irrigation |
US20070284251A1 (en) * | 2006-06-13 | 2007-12-13 | Zuback Joseph E | Method and system for providing potable water |
US20070295604A1 (en) * | 2006-06-23 | 2007-12-27 | Siemens Water Technologies Corporation | Electrically-driven separation apparatus |
EP1885655A2 (en) * | 2005-06-01 | 2008-02-13 | Siemens Water Technologies Holding Corp. | Water treatment system and process |
US20080067125A1 (en) * | 2006-09-20 | 2008-03-20 | Wilkins Frederick C | Method and apparatus for desalination |
US20080156710A1 (en) * | 2005-03-18 | 2008-07-03 | Kurita Water Industries Ltd. | Pure Water Producing Apparatus |
US20080164209A1 (en) * | 2007-01-05 | 2008-07-10 | Orest Zacerkowny | Water treatment systems and methods |
US20080203023A1 (en) * | 2002-06-06 | 2008-08-28 | Nxstage Medical, Inc. | Last-chance quality check and/or air/pathogen filtger for infusion systems |
US20080230450A1 (en) * | 2005-01-07 | 2008-09-25 | Burbank Jeffrey H | Filtration System for Preparation of Fluids for Medical Applications |
WO2007118235A3 (en) * | 2006-04-07 | 2008-12-04 | Nxstage Medical Inc | Filtration system for preparation of fluids for medical applications. |
US20090090667A1 (en) * | 2005-08-31 | 2009-04-09 | Trojan Technologies Inc. | Ultraviolet radiation lamp and source module and treatment system containing same |
US20090127119A1 (en) * | 2004-11-02 | 2009-05-21 | The Water Company Llc | Electronic components associated and apparatus for deionization and electrochemical purification and regeneration of electrodes |
US20090211975A1 (en) * | 2003-01-07 | 2009-08-27 | Brugger James M | Batch Filtration System for Preparation of Sterile Fluid for Renal Replacement Therapy |
US20100044286A1 (en) * | 2008-08-22 | 2010-02-25 | Takashi Menju | Water-Purification Pretreatment System |
US20110120886A1 (en) * | 2003-11-13 | 2011-05-26 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US20110120953A1 (en) * | 2003-11-13 | 2011-05-26 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US20110220371A1 (en) * | 2010-03-11 | 2011-09-15 | Halliburton Energy Services, Inc. | System and method for fluid treatment |
US20110303606A1 (en) * | 2009-05-28 | 2011-12-15 | Mitsubishi Heavy Industries, Ltd. | Co-producing apparatus for salt and fresh water and co-producing method of the same |
US20120024390A1 (en) * | 2009-03-03 | 2012-02-02 | Carsten Dopslaff | Method for Operating a Water Softening System Comprising Target Value Control by a Water Removal Station |
US8114260B2 (en) | 2003-11-13 | 2012-02-14 | Siemens Industry, Inc. | Water treatment system and method |
US20120181028A1 (en) * | 2011-01-14 | 2012-07-19 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
US20120181014A1 (en) * | 2011-01-14 | 2012-07-19 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
US8337686B2 (en) | 2006-10-18 | 2012-12-25 | Kinetico Incorporated | Electroregeneration apparatus and water treatment method |
US8377279B2 (en) | 2003-11-13 | 2013-02-19 | Siemens Industry, Inc. | Water treatment system and method |
US20130092530A1 (en) * | 2011-10-14 | 2013-04-18 | Samsung Electronics Co., Ltd. | Apparatus for producing electrolytic reduced water and control method thereof |
US8585882B2 (en) | 2007-11-30 | 2013-11-19 | Siemens Water Technologies Llc | Systems and methods for water treatment |
US8671985B2 (en) | 2011-10-27 | 2014-03-18 | Pentair Residential Filtration, Llc | Control valve assembly |
US20140262233A1 (en) * | 2013-03-14 | 2014-09-18 | Ecolab Usa Inc. | Monitoring produced water |
WO2014153475A2 (en) * | 2013-03-21 | 2014-09-25 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US8961770B2 (en) | 2011-10-27 | 2015-02-24 | Pentair Residential Filtration, Llc | Controller and method of operation of a capacitive deionization system |
US9010361B2 (en) | 2011-10-27 | 2015-04-21 | Pentair Residential Filtration, Llc | Control valve assembly |
US9023185B2 (en) | 2006-06-22 | 2015-05-05 | Evoqua Water Technologies Llc | Low scale potential water treatment |
US9038725B2 (en) | 2012-07-10 | 2015-05-26 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
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US9596973B2 (en) | 2013-03-21 | 2017-03-21 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US9616388B2 (en) | 2013-03-15 | 2017-04-11 | Culligan International Company | Reverse osmosis system with an automated modulated bypass |
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US9695070B2 (en) | 2011-10-27 | 2017-07-04 | Pentair Residential Filtration, Llc | Regeneration of a capacitive deionization system |
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Citations (95)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2681320A (en) * | 1950-12-23 | 1954-06-15 | Rohm & Haas | Permselective films of cationexchange resins |
US2681319A (en) * | 1951-01-10 | 1954-06-15 | Rohm & Haas | Permselective films of anionexchange resins |
US2777814A (en) * | 1954-12-02 | 1957-01-15 | Gen Electric | Water heating and demineralizing apparatus |
US2788319A (en) * | 1956-02-07 | 1957-04-09 | Clayton Manufacturing Co | Ion exchange method and apparatus |
US2794777A (en) * | 1956-08-27 | 1957-06-04 | Clayton Manufacturing Co | Electrolytic deionization |
US2923674A (en) * | 1958-02-03 | 1960-02-02 | Permutit Co Ltd | Process for the removal of dissolved solids from liquids |
US3074864A (en) * | 1959-04-21 | 1963-01-22 | Gen Electric | Methods of and apparatus for demineralizing raw water |
US3165460A (en) * | 1962-04-11 | 1965-01-12 | American Mach & Foundry | Electrolytic acid generator |
US3375208A (en) * | 1967-07-26 | 1968-03-26 | Esb Inc | Method for preparing a microporous thermoplastic resin material |
US3645884A (en) * | 1969-07-10 | 1972-02-29 | Edwin R Gilliland | Electrolytic ion exchange apparatus |
US3786924A (en) * | 1971-07-22 | 1974-01-22 | Delro Inc | Water purification system |
US3869375A (en) * | 1970-12-23 | 1975-03-04 | Asahi Chemical Ind | Gasket structure |
US3869376A (en) * | 1973-05-14 | 1975-03-04 | Alvaro R Tejeda | System for demineralizing water by electrodialysis |
US3870033A (en) * | 1973-11-30 | 1975-03-11 | Aqua Media | Ultra pure water process and apparatus |
US3876565A (en) * | 1972-09-01 | 1975-04-08 | Mitsubishi Petrochemical Co | Ion exchanger - polyolefin membranes |
US4032452A (en) * | 1975-11-13 | 1977-06-28 | Sybron Corporation | Electrically regenerated ion exchange system |
US4089758A (en) * | 1974-05-24 | 1978-05-16 | Imperial Chemical Industries Limited | Electrolytic process |
US4153761A (en) * | 1978-04-21 | 1979-05-08 | The United States Of America As Represented By The Secretary Of The Army | Method of removing foulants from ion exchange resins |
US4191811A (en) * | 1977-03-01 | 1980-03-04 | Ionics, Incorported | Ion exchange membranes based upon polyphenylene sulfide and fluorocarbon polymeric binder |
US4197206A (en) * | 1978-09-13 | 1980-04-08 | Karn William S | Heat sealable ion permeable membranes |
US4321145A (en) * | 1980-06-11 | 1982-03-23 | Carlson Lee G | Ion exchange treatment for removing toxic metals and cyanide values from waste waters |
US4330654A (en) * | 1980-06-11 | 1982-05-18 | The Dow Chemical Company | Novel polymers having acid functionality |
US4374232A (en) * | 1979-01-26 | 1983-02-15 | Gelman Sciences Inc. | Graft copolymer membrane and processes of manufacturing and using the same |
US4430226A (en) * | 1981-03-09 | 1984-02-07 | Millipore Corporation | Method and apparatus for producing ultrapure water |
US4505797A (en) * | 1983-03-24 | 1985-03-19 | Ionics, Incorporated | Ion-exchange membranes reinforced with non-woven carbon fibers |
US4574049A (en) * | 1984-06-04 | 1986-03-04 | Arrowhead Industrial Water, Inc. | Reverse osmosis system |
US4636296A (en) * | 1983-08-18 | 1987-01-13 | Gerhard Kunz | Process and apparatus for treatment of fluids, particularly desalinization of aqueous solutions |
US4655909A (en) * | 1983-12-20 | 1987-04-07 | Nippon Paint Co., Ltd. | Water-deionizing system |
US4661411A (en) * | 1986-02-25 | 1987-04-28 | The Dow Chemical Company | Method for depositing a fluorocarbonsulfonic acid polymer on a support from a solution |
US4671863A (en) * | 1985-10-28 | 1987-06-09 | Tejeda Alvaro R | Reversible electrolytic system for softening and dealkalizing water |
US4747929A (en) * | 1986-10-01 | 1988-05-31 | Millipore Corporation | Depletion compartment and spacer construction for electrodeionization apparatus |
US4747955A (en) * | 1987-04-13 | 1988-05-31 | The Graver Company | Purification of liquids with treated polyester fibers |
US4751153A (en) * | 1987-01-02 | 1988-06-14 | Continental Can Company, Inc. | Frame for a cell construction |
US4753681A (en) * | 1986-09-30 | 1988-06-28 | Millipore Corporation | Method for defouling electrodeionization apparatus |
US4804451A (en) * | 1986-10-01 | 1989-02-14 | Millipore Corporation | Depletion compartment for deionization apparatus and method |
US4808287A (en) * | 1987-12-21 | 1989-02-28 | Hark Ernst F | Water purification process |
US4915803A (en) * | 1988-09-26 | 1990-04-10 | The Dow Chemical Company | Combination seal and frame cover member for a filter press type electrolytic cell |
US4925541A (en) * | 1984-07-09 | 1990-05-15 | Millipore Corporation | Electodeionization apparatus and method |
US4931160A (en) * | 1987-05-11 | 1990-06-05 | Millipore Corporation | Electrodeionization method and apparatus |
US4983267A (en) * | 1988-10-18 | 1991-01-08 | Innova/Pure Water, Inc. | Water deionization and contaminants removal or degradation |
US5026465A (en) * | 1989-08-03 | 1991-06-25 | Ionics, Incorporated | Electrodeionization polarity reversal apparatus and process |
US5082472A (en) * | 1990-11-05 | 1992-01-21 | Mallouk Robert S | Composite membrane for facilitated transport processes |
US5084148A (en) * | 1990-02-06 | 1992-01-28 | Olin Corporation | Electrochemical process for producing chloric acid - alkali metal chlorate mixtures |
US5092970A (en) * | 1989-12-20 | 1992-03-03 | Olin Corporation | Electrochemical process for producing chlorine dioxide solutions from chlorites |
US5106465A (en) * | 1989-12-20 | 1992-04-21 | Olin Corporation | Electrochemical process for producing chlorine dioxide solutions from chlorites |
US5107896A (en) * | 1991-07-09 | 1992-04-28 | John J. Gianfrancesco | Multi-functional valve |
US5116509A (en) * | 1989-09-08 | 1992-05-26 | Millipore Corporation | Electrodeionization and ultraviolet light treatment method for purifying water |
US5120416A (en) * | 1990-03-19 | 1992-06-09 | Ionics, Incorporated | Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack |
US5126026A (en) * | 1990-09-28 | 1992-06-30 | Allied-Signal Inc. | Guard membranes for use in electrodialysis cells |
US5176828A (en) * | 1991-02-04 | 1993-01-05 | Millipore Corporation | Manifold segment stack with intermediate feed manifold |
US5196115A (en) * | 1990-04-23 | 1993-03-23 | Andelman Marc D | Controlled charge chromatography system |
US5203976A (en) * | 1990-03-19 | 1993-04-20 | Ionics, Incorporated | Introducing and removing ion-exchange and other particulates rom an assembled electrodeionization stack |
US5211823A (en) * | 1991-06-19 | 1993-05-18 | Millipore Corporation | Process for purifying resins utilizing bipolar interface |
US5292422A (en) * | 1992-09-15 | 1994-03-08 | Ip Holding Company | Modules for electrodeionization apparatus |
US5308467A (en) * | 1991-03-13 | 1994-05-03 | Ebara Corporation | Electrically regenerable demineralizing apparatus |
US5308466A (en) * | 1990-12-17 | 1994-05-03 | Ip Holding Company | Electrodeionization apparatus |
US5411641A (en) * | 1993-11-22 | 1995-05-02 | E. I. Du Pont De Nemours And Company | Electrochemical conversion of anhydrous hydrogen halide to halogen gas using a cation-transporting membrane |
US5425858A (en) * | 1994-05-20 | 1995-06-20 | The Regents Of The University Of California | Method and apparatus for capacitive deionization, electrochemical purification, and regeneration of electrodes |
US5489370A (en) * | 1989-05-08 | 1996-02-06 | Ionex | Removal of ions from a bulk source by electropotential ion transport using a host receptor matrix |
US5503729A (en) * | 1994-04-25 | 1996-04-02 | Ionics Incorporated | Electrodialysis including filled cell electrodialysis (electrodeionization) |
US5518627A (en) * | 1994-03-01 | 1996-05-21 | Mitsubishi Chemical Corporation | Method for treating water or an aqueous solution |
US5518626A (en) * | 1993-12-23 | 1996-05-21 | United Technologies Corporation | Process employing thermally sterilizable aqueous polishing agents |
US5593563A (en) * | 1996-04-26 | 1997-01-14 | Millipore Corporation | Electrodeionization process for purifying a liquid |
US5599614A (en) * | 1995-03-15 | 1997-02-04 | W. L. Gore & Associates, Inc. | Integral composite membrane |
US5714521A (en) * | 1994-04-07 | 1998-02-03 | Yeda Research And Development Company Ltd. | Ion exchange membranes |
US5736023A (en) * | 1994-05-20 | 1998-04-07 | U.S. Filter/Ionpure, Inc. | Polarity reversal and double reversal electrodeionization apparatus and method |
US5759373A (en) * | 1995-01-19 | 1998-06-02 | Asahi Glass Company Ltd. | Porous ion exchanger and method for producing deionized water |
US5762774A (en) * | 1996-12-20 | 1998-06-09 | Glegg Water Conditioning, Inc. | Apparatus for the purification of liquids and a method of manufacturing and of operating same |
US5766479A (en) * | 1995-08-07 | 1998-06-16 | Zenon Environmental Inc. | Production of high purity water using reverse osmosis |
US5858191A (en) * | 1996-09-23 | 1999-01-12 | United States Filter Corporation | Electrodeionization apparatus and method |
US5868937A (en) * | 1996-02-13 | 1999-02-09 | Mainstream Engineering Corporation | Process and system for recycling and reusing gray water |
US5891328A (en) * | 1995-03-23 | 1999-04-06 | Ionics, Incorporated | Membrane-frame for processes including electrodialysis |
US6056878A (en) * | 1998-08-03 | 2000-05-02 | E-Cell Corporation | Method and apparatus for reducing scaling in electrodeionization systems and for improving efficiency thereof |
US6171374B1 (en) * | 1998-05-29 | 2001-01-09 | Ballard Power Systems Inc. | Plate and frame fluid exchanging assembly with unitary plates and seals |
US6187162B1 (en) * | 1999-09-13 | 2001-02-13 | Leon Mir | Electrodeionization apparatus with scaling control |
US6187154B1 (en) * | 1997-10-23 | 2001-02-13 | Hoshizaki Denki Kabushiki Kaisha | Electrolyzed water production system |
US6190553B1 (en) * | 1998-12-01 | 2001-02-20 | Sangeul Lee | Purification system for disposal of polluted or waste water using water plants |
US6190558B1 (en) * | 1999-04-01 | 2001-02-20 | Nimbus Water Systems, Inc. | Reverse osmosis purification system |
US6190528B1 (en) * | 1998-03-19 | 2001-02-20 | Xiang Li | Helical electrodeionization apparatus |
US6193869B1 (en) * | 1996-02-09 | 2001-02-27 | Glegg Water Conditioning, Inc. | Modular apparatus for the demineralization of liquids |
US6197174B1 (en) * | 1998-11-25 | 2001-03-06 | E-Cell Corporation | Method and apparatus for electrodeionization of water using mixed bed and single phase ion exchange materials in the diluting compartment |
US6197189B1 (en) * | 1997-06-19 | 2001-03-06 | Oxygen8, Inc. | Oxygenated water cooler |
US6214204B1 (en) * | 1999-08-27 | 2001-04-10 | Corning Incorporated | Ion-removal from water using activated carbon electrodes |
US6228240B1 (en) * | 1996-03-21 | 2001-05-08 | Asahi Glass Company Ltd. | Method and apparatus for producing deionized water |
US6235166B1 (en) * | 1999-06-08 | 2001-05-22 | E-Cell Corporation | Sealing means for electrically driven water purification units |
US20010003329A1 (en) * | 1999-12-10 | 2001-06-14 | Asahi Glass Company, Limited | Electro-regenerating type apparatus for producing deionized water |
US6248226B1 (en) * | 1996-06-03 | 2001-06-19 | Organo Corporation | Process for producing deionized water by electrodeionization technique |
US6375812B1 (en) * | 2000-03-13 | 2002-04-23 | Hamilton Sundstrand Corporation | Water electrolysis system |
US6398965B1 (en) * | 1998-03-31 | 2002-06-04 | United States Filter Corporation | Water treatment system and process |
US6402916B1 (en) * | 1993-10-27 | 2002-06-11 | Richard L. Sampson | Electrolytic process and apparatus controlled regeneration of modified ion exchangers to purify aqueous solutions and adjust ph |
US20030080467A1 (en) * | 1999-02-09 | 2003-05-01 | Andrews Craig C. | Microorganism control of point of use potable water sources |
US20030089609A1 (en) * | 2001-10-15 | 2003-05-15 | United States Filter Corporation | Apparatus for fluid purification and methods of manufacture and use thereof |
US20030098266A1 (en) * | 2001-09-07 | 2003-05-29 | Lih-Ren Shiue | Fully automatic and energy-efficient deionizer |
US20040079700A1 (en) * | 2002-10-23 | 2004-04-29 | Jonathan Wood | Production of water for injection using reverse osmosis |
US6733646B2 (en) * | 2001-01-05 | 2004-05-11 | Kurita Water Industries Ltd. | Method and apparatus for electrodeionization of water |
Family Cites Families (205)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2535035A (en) | 1945-04-30 | 1950-12-26 | Robert E Briggs | Method of electrolytic water softening and ph adjustment |
US2514415A (en) | 1946-02-27 | 1950-07-11 | Carl H Rasch | Storage battery paste with ion exchange expander |
NL96481C (en) | 1950-07-21 | |||
US2815320A (en) | 1953-10-23 | 1957-12-03 | Kollsman Paul | Method of and apparatus for treating ionic fluids by dialysis |
GB776469A (en) | 1953-12-17 | 1957-06-05 | Tno | Process and apparatus for the electrolytic deionisation of salt-containing liquids |
US2854394A (en) | 1954-11-01 | 1958-09-30 | Kollsman Paul | Method of and apparatus for fractionation by electrodialysis |
US2912372A (en) | 1955-05-12 | 1959-11-10 | Gen Electric | Water treatment methods |
NL95176C (en) | 1955-07-30 | |||
US2906684A (en) | 1956-01-30 | 1959-09-29 | Gen Electric | Water demineralizing units |
US3296112A (en) | 1957-07-16 | 1967-01-03 | Kollsman Paul | Method of modifying the chemical composition of substances by ion transfer |
GB877239A (en) | 1957-12-24 | 1961-09-13 | Permutit Co Ltd | Improvements relating to electrodialytic cells |
GB882601A (en) | 1958-05-07 | 1961-11-15 | Permutit Co Ltd | Improvements relating to the treatment of aqueous liquids by electro-dialysis |
GB880344A (en) | 1958-06-19 | 1961-10-18 | Permutit Co Ltd | Improvements relating to electrodialytic cells |
GB893051A (en) | 1959-04-30 | 1962-04-04 | John Thompson Kennicott Ltd | Improvements in or relating to an electrodialysis apparatus |
US3091583A (en) | 1959-10-27 | 1963-05-28 | Aqua Ionics Inc | Electrodialysis cell |
GB942762A (en) | 1960-05-13 | 1963-11-27 | John Thompson Kennicott Ltd | A method of packing a receptacle with comminuted material |
US3099615A (en) | 1961-02-13 | 1963-07-30 | Kollsman Paul | Electrodialysis involving periodic current reversal |
DE1225569B (en) | 1961-05-20 | 1966-09-22 | Paul Dosch | Method and device for water softening for washing machines and dishwashers |
NL288721A (en) | 1962-02-19 | |||
GB1038777A (en) | 1962-05-04 | 1966-08-10 | American Mach & Foundry | Improvements relating to ion-exchange materials |
NL294289A (en) | 1962-06-20 | |||
DE1201055B (en) | 1962-09-27 | 1965-09-16 | Wolfen Filmfab Veb | Process for the production of heterogeneous ion exchange membranes |
US3341441A (en) | 1964-01-07 | 1967-09-12 | Ionics | Method for preventing scale buildup during electrodialysis operation |
US3291713A (en) | 1964-05-27 | 1966-12-13 | Ionics | Removal of weakly basic substances from solution by electrodeionization |
GB1137679A (en) | 1965-02-24 | 1968-12-27 | Wallace Tiernan Inc | Procedures and apparatus for electrodialytic treatment of liquids |
FR1547493A (en) | 1967-07-25 | 1968-11-29 | Improvements to the means for removing ions from a solution | |
US3630378A (en) | 1968-05-24 | 1971-12-28 | Dow Chemical Co | Novel water treating and storage apparatus |
US3627703A (en) | 1968-10-31 | 1971-12-14 | Mitsubishi Petrochemical Co | Polypropylene resin composites and production thereof |
GB1318036A (en) | 1969-10-29 | 1973-05-23 | Permutit Co Ltd | Ion-exchange treatment of liquids and apparatus for use therein |
US3679055A (en) | 1970-07-15 | 1972-07-25 | Polymetrics Inc | Reverse osmosis water purifier |
US3755135A (en) | 1971-01-20 | 1973-08-28 | A Johnson | Electric demineralizing apparatus |
US3989615A (en) | 1971-07-06 | 1976-11-02 | Nippon Soda Company Limited | Diaphragm process electrolytic cell |
BE794634A (en) | 1972-01-28 | 1973-07-26 | Rhone Poulenc Sa | DIAPHRAGM SEPARATOR |
US4359789A (en) | 1972-01-31 | 1982-11-23 | Monogram Industries, Inc. | Sewerless disposal system |
JPS532160B2 (en) | 1973-08-17 | 1978-01-25 | ||
US4167551A (en) | 1974-10-21 | 1979-09-11 | Mitsubishi Petrochemical Company Limited | Process for the production of an ion exchange membrane |
CH586059A5 (en) | 1974-11-29 | 1977-03-31 | Yeda Res & Dev | |
US4130473A (en) | 1976-03-05 | 1978-12-19 | Eddleman William L | Electrode structure for use in metal in exchange apparatus useful in purifying spent acids and the like |
US4102752A (en) | 1976-07-09 | 1978-07-25 | Rugh Ii John L | Municipal water supply system |
US4116889A (en) | 1976-08-19 | 1978-09-26 | Allied Chemical Corporation | Bipolar membranes and method of making same |
US4119581A (en) | 1977-02-23 | 1978-10-10 | California Institute Of Technology | Membrane consisting of polyquaternary amine ion exchange polymer network interpenetrating the chains of thermoplastic matrix polymer |
US4162218A (en) | 1977-06-27 | 1979-07-24 | Mccormick Gerald L | Water reuse system |
IL52757A0 (en) | 1977-08-16 | 1977-10-31 | Yeda Res & Dev | Dimensionally stable ion exchange membranes for electrodialysis |
IL52758A0 (en) | 1977-08-16 | 1977-10-31 | Yeda Res & Dev | Improved device for electrodialysis |
JPS5512141A (en) | 1978-07-13 | 1980-01-28 | Mitsubishi Petrochem Co Ltd | Manufacturing of ion exchange membrane |
US4228000A (en) | 1979-01-08 | 1980-10-14 | Hoeschler Frank A | Water treatment apparatus with means for automatic disinfection thereof |
US4216073A (en) | 1979-05-29 | 1980-08-05 | Ionics Inc. | Ion exchange resin containing activated carbon |
US4358545A (en) | 1980-06-11 | 1982-11-09 | The Dow Chemical Company | Sulfonic acid electrolytic cell having flourinated polymer membrane with hydration product less than 22,000 |
US4298442A (en) | 1980-08-04 | 1981-11-03 | Ionics, Incorporated | Electrodialysis process for silica removal |
US4465573A (en) | 1981-05-12 | 1984-08-14 | Hare Harry M O | Method and apparatus for the purification of water |
WO1983003984A1 (en) | 1982-05-13 | 1983-11-24 | Gerhard Kunz | Method for the treatment of a liquid phase, particularly method for desalting aqueous solutions, as well as device for its implementation |
DE3238280A1 (en) | 1982-10-15 | 1984-04-19 | Hans-Wilhelm Prof. Dr.-Ing. 1000 Berlin Lieber | Process for desalting solutions |
US4473450A (en) | 1983-04-15 | 1984-09-25 | Raychem Corporation | Electrochemical method and apparatus |
US4610790A (en) | 1984-02-10 | 1986-09-09 | Sterimatics Company Limited Partnership | Process and system for producing sterile water and sterile aqueous solutions |
DE3423653A1 (en) | 1984-06-27 | 1986-01-09 | Gerhard K. Dipl.-Chem. Dr.-Ing. 5628 Heiligenhaus Kunz | Method and device for metering in ions into liquids, in particular aqueous solutions |
EP0170895B1 (en) | 1984-07-09 | 1989-03-22 | Millipore Corporation | Improved electrodeionization apparatus and method |
US5154809A (en) | 1984-07-09 | 1992-10-13 | Millipore Corporation | Process for purifying water |
USRE35741E (en) * | 1984-07-09 | 1998-03-10 | Millipore Corporation | Process for purifying water |
US4956071A (en) | 1984-07-09 | 1990-09-11 | Millipore Corporation | Electrodeionization apparatus and module |
GB8513114D0 (en) | 1985-05-23 | 1985-06-26 | Ici Plc | Membranes |
US4614576A (en) | 1985-10-22 | 1986-09-30 | Ionics, Incorporated | Microliter scale electrodialysis apparatus |
ZA87553B (en) | 1986-01-31 | 1988-03-30 | Water Res Commission | Dewatering slurries |
EP0253119A3 (en) | 1986-06-13 | 1989-07-19 | Asahi Glass Company Ltd. | Ion exchange membrane for electrolysis |
US4707240A (en) | 1986-09-15 | 1987-11-17 | Ionics Incorporated | Method and apparatus for improving the life of an electrode |
IT1202425B (en) * | 1987-01-26 | 1989-02-09 | Giuseppe Bianchi | ELECTROCHEMICAL DEOXYGENATION PROCESS FOR THE CONTROL OF CORROSION IN DEIONIZED WATERS |
US4849102A (en) | 1988-05-31 | 1989-07-18 | Filtron Technology Corporation | Bidirectional ultrafiltration apparatus |
US4969983A (en) * | 1988-07-11 | 1990-11-13 | Ionics, Incorporated | Apparatus and process for the removal of acidic and basic gases from fluid mixtures using bipolar membranes |
US4871431A (en) * | 1988-07-11 | 1989-10-03 | Ionics, Incorporated | Apparatus for the removal of dissolved solids from liquids using bipolar membranes |
US4964970A (en) | 1988-10-05 | 1990-10-23 | Hoh Water Technology Corp. | Compact low volume water purification apparatus |
CN1021828C (en) | 1989-01-24 | 1993-08-18 | 上海市合成树脂研究所 | Continuous prepn. of ion exchange membrane used for different phase |
US5254227A (en) | 1989-06-16 | 1993-10-19 | Olin Corporation | Process for removing catalyst impurities from polyols |
JPH0647105B2 (en) | 1989-12-19 | 1994-06-22 | 株式会社荏原総合研究所 | Purification method and device for pure water or ultrapure water |
US5066375A (en) | 1990-03-19 | 1991-11-19 | Ionics, Incorporated | Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack |
US5059330A (en) | 1990-04-02 | 1991-10-22 | Burkhardt Donald O | Gray water reclamation method and apparatus |
US5192432A (en) | 1990-04-23 | 1993-03-09 | Andelman Marc D | Flow-through capacitor |
DE4016000C2 (en) | 1990-05-18 | 1993-10-21 | Hager & Elsaesser | Device for the treatment of metal-containing liquids by ion exchange and simultaneous or periodic regeneration of the ion exchange resin by electrodialysis |
US5032265A (en) | 1990-06-20 | 1991-07-16 | Millipore Corporation | Method and system for producing sterile aqueous solutions |
WO1992003202A2 (en) | 1990-08-20 | 1992-03-05 | Abbott Laboratories | Medical drug formulation and delivery system |
FR2666245B1 (en) | 1990-08-31 | 1992-10-23 | Lyonnaise Eaux | METHOD FOR CONTROLLING THE OPERATING MODES OF AN AUTOMATIC WATER FILTRATION APPARATUS ON TUBULAR MEMBRANES. |
US5064097A (en) | 1990-10-10 | 1991-11-12 | Water Center International Ltd. | Compact water purification and beverage dispensing apparatus |
FR2668077B1 (en) | 1990-10-22 | 1992-12-04 | Commissariat Energie Atomique | REVERSE OSMOSIS OR NANOFILTRATION MEMBRANE AND MANUFACTURING METHOD THEREOF. |
USH1206H (en) | 1991-01-24 | 1993-07-06 | The United States Of America As Represented By The Secretary Of The Air Force | Cascade crossflow tower |
US5128043A (en) | 1991-02-13 | 1992-07-07 | Wildermuth Glen W | Method and apparatus for purifying liquids |
IL97543A (en) | 1991-03-14 | 1994-11-11 | Yeda Res & Dev | Electrodialysis reversal process and apparatus with bipolar membranes for hard-water softening |
US5259936A (en) | 1991-06-19 | 1993-11-09 | Millipore Corporation | Purified ion exchange resins and process |
JPH05262902A (en) | 1992-03-23 | 1993-10-12 | Tanaka Kikinzoku Kogyo Kk | Preparation of ion-exchange membrane |
US5316740A (en) | 1992-03-26 | 1994-05-31 | Los Alamos Technical Associates, Inc. | Electrolytic cell for generating sterilization solutions having increased ozone content |
EP0570341B1 (en) | 1992-05-15 | 1996-09-18 | Christ AG | Apparatus for the continuous electrochemical desalination of aqueous solutions |
US5166220A (en) | 1992-06-01 | 1992-11-24 | Mcmahon John M | Water softening process |
FR2692882B1 (en) | 1992-06-29 | 1994-10-07 | Trailigaz | Process for treating, in particular drinking water, with ozone. Installation for the implementation of the process. |
US5358640A (en) | 1992-07-20 | 1994-10-25 | Nalco Chemical Company | Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems |
US5346924B1 (en) | 1992-09-23 | 2000-04-25 | Ionpure Techn Corp | Heterogenous ion exchange materials comprising polyethylene of linear low density or high density high molecular weight |
DE4238532A1 (en) | 1992-11-14 | 1994-05-19 | Kunz Gerhard K | Method and device for desalting aqueous solutions using ion exchange materials |
US5286354A (en) * | 1992-11-30 | 1994-02-15 | Sachem, Inc. | Method for preparing organic and inorganic hydroxides and alkoxides by electrolysis |
US5346624A (en) | 1993-01-11 | 1994-09-13 | The Graver Company | Method and apparatus for treatment of aqueous solutions |
IN181196B (en) | 1993-01-20 | 1998-04-25 | Raju Manjarabad Venkataramanas | |
US5356849A (en) | 1993-01-21 | 1994-10-18 | Calgon Carbon Corporation | Catalytic carbon |
US5444031A (en) | 1993-01-21 | 1995-08-22 | Calgon Carbon Corporation | Process for making catalytic carbon |
JP2751090B2 (en) | 1993-04-21 | 1998-05-18 | 日本錬水株式会社 | Pure water production equipment |
US5538611A (en) | 1993-05-17 | 1996-07-23 | Marc D. Andelman | Planar, flow-through, electric, double-layer capacitor and a method of treating liquids with the capacitor |
US5434020A (en) | 1993-11-15 | 1995-07-18 | The Regents Of The University Of California | Continuous-feed electrochemical cell with nonpacking particulate electrode |
JP3187629B2 (en) | 1993-12-16 | 2001-07-11 | オルガノ株式会社 | Reverse osmosis membrane treatment method |
US5460728A (en) | 1993-12-21 | 1995-10-24 | Shell Oil Company | Method for inhibiting the plugging of conduits by gas hydrates |
WO1995026821A1 (en) | 1994-03-30 | 1995-10-12 | Tingsheng Wang | Process and apparatus for regeneration of resins in fixed double-bed type |
US5584981A (en) | 1994-05-06 | 1996-12-17 | United Kingdom Atomic Energy Authority | Electrochemical deionization |
EP0680932B1 (en) | 1994-05-06 | 2001-08-08 | AEA Technology plc | Electrochemical deionisation |
EP0683136A3 (en) | 1994-05-06 | 1998-05-13 | AEA Technology plc | Silver removal |
US5451309A (en) | 1994-05-09 | 1995-09-19 | B&W Nuclear Technologies, Inc. | Ion exchange resin regeneration apparatus |
US6309532B1 (en) | 1994-05-20 | 2001-10-30 | Regents Of The University Of California | Method and apparatus for capacitive deionization and electrochemical purification and regeneration of electrodes |
DE4418812C2 (en) | 1994-05-30 | 1999-03-25 | Forschungszentrum Juelich Gmbh | Single and multiple electrolysis cells and arrangements thereof for the deionization of aqueous media |
US20030038089A1 (en) | 1994-06-17 | 2003-02-27 | Ehud Levy | Method of reducing contaminants in drinking water |
US6241893B1 (en) | 1994-06-17 | 2001-06-05 | Ehud Levy | Water filtration media, apparatus and processes |
US5538746A (en) | 1994-06-17 | 1996-07-23 | Levy; Ehud | Process for filtering water prior to carbonation |
US5460725A (en) | 1994-06-21 | 1995-10-24 | The Dow Chemical Company | Polymeric adsorbents with enhanced adsorption capacity and kinetics and a process for their manufacture |
US5538655A (en) | 1994-06-29 | 1996-07-23 | Arthur D. Little, Inc. | Molecular complexes for use as electrolyte components |
US5520816A (en) | 1994-08-18 | 1996-05-28 | Kuepper; Theodore A. | Zero waste effluent desalination system |
US5458787A (en) | 1994-10-27 | 1995-10-17 | Uop | Extraction of certain metal cations from aqueous solutions |
US5547551A (en) | 1995-03-15 | 1996-08-20 | W. L. Gore & Associates, Inc. | Ultra-thin integral composite membrane |
US5783050A (en) | 1995-05-04 | 1998-07-21 | Eltech Systems Corporation | Electrode for electrochemical cell |
US5670053A (en) | 1995-08-07 | 1997-09-23 | Zenon Environmental, Inc. | Purification of gases from water using reverse osmosis |
DE19542475C2 (en) | 1995-11-15 | 1999-10-28 | Ballard Power Systems | Polymer electrolyte membrane fuel cell and method for producing a distributor plate for such a cell |
JP3518112B2 (en) | 1995-12-06 | 2004-04-12 | 東京瓦斯株式会社 | Fuel cell water treatment equipment |
GB9600633D0 (en) | 1996-01-12 | 1996-03-13 | Glegg Water Conditioning Inc | Elecrodeionization apparatus having geometric arrangement of ion exchange material |
RO114874B1 (en) | 1996-06-21 | 1999-08-30 | Sc Ind Etans Srl | Process for making support boards for filter cells, fluid distribution system of micro- and ultrafiltration filter and mould for manufacturing the same |
JPH10128338A (en) | 1996-10-29 | 1998-05-19 | Ebara Corp | Method and device for preventing scale from being deposited in electric regeneration type continuous desalting apparatus |
US5788826A (en) | 1997-01-28 | 1998-08-04 | Pionetics Corporation | Electrochemically assisted ion exchange |
US6267891B1 (en) | 1997-03-03 | 2001-07-31 | Zenon Environmental Inc. | High purity water production using ion exchange |
US6258278B1 (en) | 1997-03-03 | 2001-07-10 | Zenon Environmental, Inc. | High purity water production |
JPH10277557A (en) | 1997-04-10 | 1998-10-20 | Asahi Glass Co Ltd | Deionized water making apparatus |
US5925240A (en) | 1997-05-20 | 1999-07-20 | United States Filter Corporation | Water treatment system having dosing control |
WO1998058727A1 (en) | 1997-06-20 | 1998-12-30 | Ionics, Incorporated | Fluid purification devices and methods employing deionization followed by ionization followed by deionization |
US6780328B1 (en) * | 1997-06-20 | 2004-08-24 | Li Zhang | Fluid purification devices and methods employing deionization followed by ionization followed by deionization |
US6146524A (en) | 1997-09-15 | 2000-11-14 | Story; Craig W. | Multi-stage ozone injection water treatment system |
US5971368A (en) | 1997-10-29 | 1999-10-26 | Fsi International, Inc. | System to increase the quantity of dissolved gas in a liquid and to maintain the increased quantity of dissolved gas in the liquid until utilized |
US6017433A (en) * | 1997-11-12 | 2000-01-25 | Archer Daniels Midland Company | Desalting aqueous streams via filled cell electrodialysis |
KR100299139B1 (en) | 1997-12-31 | 2001-11-14 | 윤종용 | Decimation filter and method for the same |
US6402917B1 (en) | 1998-02-09 | 2002-06-11 | Otv Societe Anonyme | Electrodialysis apparatus |
US6099716A (en) | 1998-05-26 | 2000-08-08 | Proton Energy Systems, Inc. | Electrochemical cell frame |
US6149788A (en) | 1998-10-16 | 2000-11-21 | E-Cell Corporation | Method and apparatus for preventing scaling in electrodeionization units |
US6315886B1 (en) * | 1998-12-07 | 2001-11-13 | The Electrosynthesis Company, Inc. | Electrolytic apparatus and methods for purification of aqueous solutions |
US6428689B1 (en) | 1999-01-27 | 2002-08-06 | Sanyo Electric Co., Ltd. | Water purifying and dispensing apparatus, and method of purifying chlorine-containing water |
US6284124B1 (en) | 1999-01-29 | 2001-09-04 | United States Filter Corporation | Electrodeionization apparatus and method |
IT1309792B1 (en) | 1999-04-22 | 2002-01-30 | Eltek Spa | HOUSEHOLD APPLIANCES USING WATER, IN PARTICULAR A WASHING MACHINE, WITH PERFECTED DEVICE FOR BLAST CHILLING |
ATE284164T1 (en) | 1999-04-22 | 2004-12-15 | Eltek Spa | WATER-CHARGING HOUSEHOLD APPLIANCE, NAMELY WASHING MACHINE, HAVING AN IMPROVED WATER SOFTENING DEVICE |
US6482304B1 (en) | 1999-05-07 | 2002-11-19 | Otv Societe Anonyme | Apparatus and method of recirculating electrodeionization |
AU5380600A (en) | 1999-06-08 | 2000-12-28 | E-Cell Corporation | Sealing means for electrically driven water purification units and method of manufacturing thereof |
JP2001015526A (en) * | 1999-06-28 | 2001-01-19 | Nec Kansai Ltd | Field effect transistor |
JP3389889B2 (en) * | 1999-07-13 | 2003-03-24 | 栗田工業株式会社 | Electric deionizer |
US6254741B1 (en) | 1999-08-05 | 2001-07-03 | Stuart Energy Systems Corporation | Electrolytic cells of improved fluid sealability |
JP3570304B2 (en) | 1999-08-11 | 2004-09-29 | 栗田工業株式会社 | Sterilization method of deionized water production apparatus and method of producing deionized water |
US6379518B1 (en) | 1999-08-11 | 2002-04-30 | Kurita Water Industries Ltd. | Electrodeionization apparatus and pure water producing apparatus |
DE19942347B4 (en) | 1999-09-04 | 2004-07-22 | Dechema Gesellschaft Für Chemische Technik Und Biotechnologie E.V. | Electrochemically regenerable ion exchanger |
US6296751B1 (en) | 1999-09-13 | 2001-10-02 | Leon Mir | Electrodeionization apparatus with scaling control |
US6284399B1 (en) | 1999-09-17 | 2001-09-04 | Plug Power Llc | Fuel cell system having humidification membranes |
JP3508647B2 (en) | 1999-10-07 | 2004-03-22 | 栗田工業株式会社 | Electrodeionization equipment |
JP4110689B2 (en) | 1999-10-14 | 2008-07-02 | 栗田工業株式会社 | Electrodeionization equipment |
JP4172117B2 (en) | 1999-10-14 | 2008-10-29 | 栗田工業株式会社 | Electrodeionization equipment |
US6258265B1 (en) | 1999-10-15 | 2001-07-10 | James Phillip Jones | Water purifying apparatus having a plurality of purifying stages and modular ion exchange media containers |
JP3593932B2 (en) | 1999-10-18 | 2004-11-24 | 栗田工業株式会社 | High-purity water production apparatus and high-purity water production method |
JP3801821B2 (en) | 1999-10-29 | 2006-07-26 | 株式会社荏原製作所 | Electric desalination equipment |
US6503957B1 (en) | 1999-11-19 | 2003-01-07 | Electropure, Inc. | Methods and apparatus for the formation of heterogeneous ion-exchange membranes |
US6627073B2 (en) | 1999-12-16 | 2003-09-30 | Sanyo Electric Co, Ltd. | Water treatment device |
FR2803284B1 (en) | 2000-01-03 | 2002-04-12 | Michel Bernard | AUTOMATIC DRINKING WATER PURIFICATION DEVICE |
EP1129765A1 (en) | 2000-03-02 | 2001-09-05 | Asahi Glass Company Ltd. | Method for producing deionized water |
US6274019B1 (en) * | 2000-03-08 | 2001-08-14 | Organo Corporation | Electrodeionization apparatus |
US6365023B1 (en) * | 2000-06-22 | 2002-04-02 | Millipore Corporation | Electrodeionization process |
GB0016846D0 (en) | 2000-07-10 | 2000-08-30 | United States Filter Corp | Electrodeionisation Apparatus |
US6391178B1 (en) * | 2000-07-13 | 2002-05-21 | Millipore Corporation | Electrodeionization system |
KR100465580B1 (en) | 2000-07-13 | 2005-01-13 | 쿠리타 고교 가부시키가이샤 | Electro-deionization device and method for operating the same |
JP4778664B2 (en) * | 2000-08-11 | 2011-09-21 | ジーイー・アイオニクス・インコーポレイテッド | Apparatus and method for electrodialysis |
US6495014B1 (en) | 2000-08-17 | 2002-12-17 | University Of Chicago | Electrodeionization substrate, and device for electrodeionization treatment |
US6645383B1 (en) | 2000-08-25 | 2003-11-11 | Usf Consumer & Commercial Watergroup, Inc. | Process and apparatus for blending product liquid from different TFC membranes |
US7147785B2 (en) | 2000-09-28 | 2006-12-12 | Usfilter Corporation | Electrodeionization device and methods of use |
US20020144954A1 (en) | 2000-09-28 | 2002-10-10 | Arba John W. | Electrodeionization device and methods of use |
US20020103724A1 (en) | 2000-12-01 | 2002-08-01 | Stephen Huxter | Courier independent system and method for the delivery of goods ordered by the internet |
US6607647B2 (en) | 2001-04-25 | 2003-08-19 | United States Filter Corporation | Electrodeionization apparatus with expanded conductive mesh electrode and method |
US6649037B2 (en) * | 2001-05-29 | 2003-11-18 | United States Filter Corporation | Electrodeionization apparatus and method |
US6579445B2 (en) | 2001-06-01 | 2003-06-17 | Sartorius Ag | System for the production of laboratory grade ultrapure water |
JP4507270B2 (en) | 2001-06-26 | 2010-07-21 | 三浦工業株式会社 | Water softening device and regeneration control method thereof |
US6607668B2 (en) * | 2001-08-17 | 2003-08-19 | Technology Ventures, Inc. | Water purifier |
JP4997678B2 (en) | 2001-09-27 | 2012-08-08 | 栗田工業株式会社 | Electrodeionization equipment |
EP1440041B1 (en) | 2001-11-05 | 2009-10-14 | Bionomics Ltd. | Apparatus and method for producing purified water having high microbiological purity by using a reverse osmosis membrane assembly |
US6896814B2 (en) | 2001-12-20 | 2005-05-24 | Aquatech International Corporation | Fractional deionization process |
US20030155243A1 (en) | 2002-02-21 | 2003-08-21 | Eet Corporation | Multi-path split cell spacer and electrodialysis stack design |
US6808608B2 (en) | 2002-03-13 | 2004-10-26 | Dionex Corporation | Water purifier and method |
US6758954B2 (en) | 2002-04-11 | 2004-07-06 | U.S. Filter Corporation | Electrodeionization apparatus with resilient endblock |
WO2003097536A1 (en) | 2002-05-17 | 2003-11-27 | Ebara Corporation | Electric demineralizer |
US20040118780A1 (en) | 2002-12-20 | 2004-06-24 | Barnstead/Thermolyne Corporation | Water purification system and method |
US6929748B2 (en) * | 2003-03-28 | 2005-08-16 | Chemitreat Pte Ltd | Apparatus and method for continuous electrodeionization |
JP4384444B2 (en) | 2003-05-29 | 2009-12-16 | 株式会社荏原製作所 | Electric demineralizer and electrodialyzer |
JP2005007347A (en) | 2003-06-20 | 2005-01-13 | Matsushita Electric Ind Co Ltd | Electrodialysis type water purifier |
JP2005007348A (en) | 2003-06-20 | 2005-01-13 | Matsushita Electric Ind Co Ltd | Electric deionizer |
US20050103717A1 (en) * | 2003-11-13 | 2005-05-19 | United States Filter Corporation | Water treatment system and method |
US7083733B2 (en) | 2003-11-13 | 2006-08-01 | Usfilter Corporation | Water treatment system and method |
US8377279B2 (en) * | 2003-11-13 | 2013-02-19 | Siemens Industry, Inc. | Water treatment system and method |
US7862700B2 (en) * | 2003-11-13 | 2011-01-04 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US7338595B2 (en) * | 2003-11-13 | 2008-03-04 | Culligan International Company | Flow-through tank for water treatment |
US7563351B2 (en) | 2003-11-13 | 2009-07-21 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US7582198B2 (en) | 2003-11-13 | 2009-09-01 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US7846340B2 (en) * | 2003-11-13 | 2010-12-07 | Siemens Water Technologies Corp. | Water treatment system and method |
US7604725B2 (en) | 2003-11-13 | 2009-10-20 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US7329358B2 (en) | 2004-05-27 | 2008-02-12 | Siemens Water Technologies Holding Corp. | Water treatment process |
AU2005285052C1 (en) * | 2004-09-13 | 2011-01-20 | University Of South Carolina | Water desalination process and apparatus |
US20060231403A1 (en) | 2005-04-14 | 2006-10-19 | Riviello John M | Chambered electrodeionization apparatus with uniform current density, and method of use |
KR100991794B1 (en) | 2007-12-31 | 2010-11-03 | 엘지전자 주식회사 | Method For Reducing Inter-Cell Interference |
-
2003
- 2003-11-13 US US10/712,621 patent/US20050103717A1/en not_active Abandoned
-
2004
- 2004-11-12 TW TW93134566A patent/TW200516059A/en unknown
- 2004-11-12 EP EP04810774A patent/EP1685071A2/en not_active Withdrawn
- 2004-11-12 WO PCT/US2004/037706 patent/WO2005049510A2/en active Application Filing
- 2004-11-12 JP JP2006539872A patent/JP2007513748A/en active Pending
-
2010
- 2010-12-07 US US12/962,064 patent/US8658043B2/en not_active Expired - Lifetime
Patent Citations (101)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2681320A (en) * | 1950-12-23 | 1954-06-15 | Rohm & Haas | Permselective films of cationexchange resins |
US2681319A (en) * | 1951-01-10 | 1954-06-15 | Rohm & Haas | Permselective films of anionexchange resins |
US2777814A (en) * | 1954-12-02 | 1957-01-15 | Gen Electric | Water heating and demineralizing apparatus |
US2788319A (en) * | 1956-02-07 | 1957-04-09 | Clayton Manufacturing Co | Ion exchange method and apparatus |
US2794777A (en) * | 1956-08-27 | 1957-06-04 | Clayton Manufacturing Co | Electrolytic deionization |
US2923674A (en) * | 1958-02-03 | 1960-02-02 | Permutit Co Ltd | Process for the removal of dissolved solids from liquids |
US3074864A (en) * | 1959-04-21 | 1963-01-22 | Gen Electric | Methods of and apparatus for demineralizing raw water |
US3165460A (en) * | 1962-04-11 | 1965-01-12 | American Mach & Foundry | Electrolytic acid generator |
US3375208A (en) * | 1967-07-26 | 1968-03-26 | Esb Inc | Method for preparing a microporous thermoplastic resin material |
US3645884A (en) * | 1969-07-10 | 1972-02-29 | Edwin R Gilliland | Electrolytic ion exchange apparatus |
US3869375A (en) * | 1970-12-23 | 1975-03-04 | Asahi Chemical Ind | Gasket structure |
US3786924A (en) * | 1971-07-22 | 1974-01-22 | Delro Inc | Water purification system |
US3876565A (en) * | 1972-09-01 | 1975-04-08 | Mitsubishi Petrochemical Co | Ion exchanger - polyolefin membranes |
US3869376A (en) * | 1973-05-14 | 1975-03-04 | Alvaro R Tejeda | System for demineralizing water by electrodialysis |
US3870033A (en) * | 1973-11-30 | 1975-03-11 | Aqua Media | Ultra pure water process and apparatus |
US4089758A (en) * | 1974-05-24 | 1978-05-16 | Imperial Chemical Industries Limited | Electrolytic process |
US4032452A (en) * | 1975-11-13 | 1977-06-28 | Sybron Corporation | Electrically regenerated ion exchange system |
US4191811A (en) * | 1977-03-01 | 1980-03-04 | Ionics, Incorported | Ion exchange membranes based upon polyphenylene sulfide and fluorocarbon polymeric binder |
US4153761A (en) * | 1978-04-21 | 1979-05-08 | The United States Of America As Represented By The Secretary Of The Army | Method of removing foulants from ion exchange resins |
US4197206A (en) * | 1978-09-13 | 1980-04-08 | Karn William S | Heat sealable ion permeable membranes |
US4374232A (en) * | 1979-01-26 | 1983-02-15 | Gelman Sciences Inc. | Graft copolymer membrane and processes of manufacturing and using the same |
US4321145A (en) * | 1980-06-11 | 1982-03-23 | Carlson Lee G | Ion exchange treatment for removing toxic metals and cyanide values from waste waters |
US4330654A (en) * | 1980-06-11 | 1982-05-18 | The Dow Chemical Company | Novel polymers having acid functionality |
US4430226A (en) * | 1981-03-09 | 1984-02-07 | Millipore Corporation | Method and apparatus for producing ultrapure water |
US4505797A (en) * | 1983-03-24 | 1985-03-19 | Ionics, Incorporated | Ion-exchange membranes reinforced with non-woven carbon fibers |
US4636296A (en) * | 1983-08-18 | 1987-01-13 | Gerhard Kunz | Process and apparatus for treatment of fluids, particularly desalinization of aqueous solutions |
US4655909A (en) * | 1983-12-20 | 1987-04-07 | Nippon Paint Co., Ltd. | Water-deionizing system |
US4574049A (en) * | 1984-06-04 | 1986-03-04 | Arrowhead Industrial Water, Inc. | Reverse osmosis system |
US4574049B1 (en) * | 1984-06-04 | 1999-02-02 | Ionpure Filter Us Inc | Reverse osmosis system |
US4925541A (en) * | 1984-07-09 | 1990-05-15 | Millipore Corporation | Electodeionization apparatus and method |
US4925541B1 (en) * | 1984-07-09 | 1994-08-02 | Millipore Corp | Electrodeionization apparatus and method |
US4671863A (en) * | 1985-10-28 | 1987-06-09 | Tejeda Alvaro R | Reversible electrolytic system for softening and dealkalizing water |
US4661411A (en) * | 1986-02-25 | 1987-04-28 | The Dow Chemical Company | Method for depositing a fluorocarbonsulfonic acid polymer on a support from a solution |
US4753681A (en) * | 1986-09-30 | 1988-06-28 | Millipore Corporation | Method for defouling electrodeionization apparatus |
US4747929A (en) * | 1986-10-01 | 1988-05-31 | Millipore Corporation | Depletion compartment and spacer construction for electrodeionization apparatus |
US4804451A (en) * | 1986-10-01 | 1989-02-14 | Millipore Corporation | Depletion compartment for deionization apparatus and method |
US4751153A (en) * | 1987-01-02 | 1988-06-14 | Continental Can Company, Inc. | Frame for a cell construction |
US4747955A (en) * | 1987-04-13 | 1988-05-31 | The Graver Company | Purification of liquids with treated polyester fibers |
US4931160A (en) * | 1987-05-11 | 1990-06-05 | Millipore Corporation | Electrodeionization method and apparatus |
US4808287A (en) * | 1987-12-21 | 1989-02-28 | Hark Ernst F | Water purification process |
US4915803A (en) * | 1988-09-26 | 1990-04-10 | The Dow Chemical Company | Combination seal and frame cover member for a filter press type electrolytic cell |
US4983267A (en) * | 1988-10-18 | 1991-01-08 | Innova/Pure Water, Inc. | Water deionization and contaminants removal or degradation |
US5489370A (en) * | 1989-05-08 | 1996-02-06 | Ionex | Removal of ions from a bulk source by electropotential ion transport using a host receptor matrix |
US5026465A (en) * | 1989-08-03 | 1991-06-25 | Ionics, Incorporated | Electrodeionization polarity reversal apparatus and process |
US5116509A (en) * | 1989-09-08 | 1992-05-26 | Millipore Corporation | Electrodeionization and ultraviolet light treatment method for purifying water |
US5106465A (en) * | 1989-12-20 | 1992-04-21 | Olin Corporation | Electrochemical process for producing chlorine dioxide solutions from chlorites |
US5092970A (en) * | 1989-12-20 | 1992-03-03 | Olin Corporation | Electrochemical process for producing chlorine dioxide solutions from chlorites |
US5084148A (en) * | 1990-02-06 | 1992-01-28 | Olin Corporation | Electrochemical process for producing chloric acid - alkali metal chlorate mixtures |
US5223103A (en) * | 1990-02-06 | 1993-06-29 | Olin Corporation | Electrochemical process for producing chloric acid-alkali metal chlorate mixtures |
US5120416A (en) * | 1990-03-19 | 1992-06-09 | Ionics, Incorporated | Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack |
US5203976A (en) * | 1990-03-19 | 1993-04-20 | Ionics, Incorporated | Introducing and removing ion-exchange and other particulates rom an assembled electrodeionization stack |
US5196115A (en) * | 1990-04-23 | 1993-03-23 | Andelman Marc D | Controlled charge chromatography system |
US5126026A (en) * | 1990-09-28 | 1992-06-30 | Allied-Signal Inc. | Guard membranes for use in electrodialysis cells |
US5082472A (en) * | 1990-11-05 | 1992-01-21 | Mallouk Robert S | Composite membrane for facilitated transport processes |
US5316637A (en) * | 1990-12-17 | 1994-05-31 | Ip Holding Company | Electrodeionization apparatus |
US5308466A (en) * | 1990-12-17 | 1994-05-03 | Ip Holding Company | Electrodeionization apparatus |
US5176828A (en) * | 1991-02-04 | 1993-01-05 | Millipore Corporation | Manifold segment stack with intermediate feed manifold |
US5308467A (en) * | 1991-03-13 | 1994-05-03 | Ebara Corporation | Electrically regenerable demineralizing apparatus |
US5425866A (en) * | 1991-03-13 | 1995-06-20 | Ebara Corporation | Electrically regenerable demineralizing apparatus |
US5211823A (en) * | 1991-06-19 | 1993-05-18 | Millipore Corporation | Process for purifying resins utilizing bipolar interface |
US5107896A (en) * | 1991-07-09 | 1992-04-28 | John J. Gianfrancesco | Multi-functional valve |
US5292422A (en) * | 1992-09-15 | 1994-03-08 | Ip Holding Company | Modules for electrodeionization apparatus |
US6402916B1 (en) * | 1993-10-27 | 2002-06-11 | Richard L. Sampson | Electrolytic process and apparatus controlled regeneration of modified ion exchangers to purify aqueous solutions and adjust ph |
US5411641A (en) * | 1993-11-22 | 1995-05-02 | E. I. Du Pont De Nemours And Company | Electrochemical conversion of anhydrous hydrogen halide to halogen gas using a cation-transporting membrane |
US5518626A (en) * | 1993-12-23 | 1996-05-21 | United Technologies Corporation | Process employing thermally sterilizable aqueous polishing agents |
US5518627A (en) * | 1994-03-01 | 1996-05-21 | Mitsubishi Chemical Corporation | Method for treating water or an aqueous solution |
US5714521A (en) * | 1994-04-07 | 1998-02-03 | Yeda Research And Development Company Ltd. | Ion exchange membranes |
US5503729A (en) * | 1994-04-25 | 1996-04-02 | Ionics Incorporated | Electrodialysis including filled cell electrodialysis (electrodeionization) |
US5736023A (en) * | 1994-05-20 | 1998-04-07 | U.S. Filter/Ionpure, Inc. | Polarity reversal and double reversal electrodeionization apparatus and method |
US5425858A (en) * | 1994-05-20 | 1995-06-20 | The Regents Of The University Of California | Method and apparatus for capacitive deionization, electrochemical purification, and regeneration of electrodes |
US5759373A (en) * | 1995-01-19 | 1998-06-02 | Asahi Glass Company Ltd. | Porous ion exchanger and method for producing deionized water |
US5599614A (en) * | 1995-03-15 | 1997-02-04 | W. L. Gore & Associates, Inc. | Integral composite membrane |
US5891328A (en) * | 1995-03-23 | 1999-04-06 | Ionics, Incorporated | Membrane-frame for processes including electrodialysis |
US5766479A (en) * | 1995-08-07 | 1998-06-16 | Zenon Environmental Inc. | Production of high purity water using reverse osmosis |
US6193869B1 (en) * | 1996-02-09 | 2001-02-27 | Glegg Water Conditioning, Inc. | Modular apparatus for the demineralization of liquids |
US5868937A (en) * | 1996-02-13 | 1999-02-09 | Mainstream Engineering Corporation | Process and system for recycling and reusing gray water |
US6228240B1 (en) * | 1996-03-21 | 2001-05-08 | Asahi Glass Company Ltd. | Method and apparatus for producing deionized water |
US5593563A (en) * | 1996-04-26 | 1997-01-14 | Millipore Corporation | Electrodeionization process for purifying a liquid |
US6248226B1 (en) * | 1996-06-03 | 2001-06-19 | Organo Corporation | Process for producing deionized water by electrodeionization technique |
US5868915A (en) * | 1996-09-23 | 1999-02-09 | United States Filter Corporation | Electrodeionization apparatus and method |
US5858191A (en) * | 1996-09-23 | 1999-01-12 | United States Filter Corporation | Electrodeionization apparatus and method |
US5762774A (en) * | 1996-12-20 | 1998-06-09 | Glegg Water Conditioning, Inc. | Apparatus for the purification of liquids and a method of manufacturing and of operating same |
US6197189B1 (en) * | 1997-06-19 | 2001-03-06 | Oxygen8, Inc. | Oxygenated water cooler |
US6187154B1 (en) * | 1997-10-23 | 2001-02-13 | Hoshizaki Denki Kabushiki Kaisha | Electrolyzed water production system |
US6190528B1 (en) * | 1998-03-19 | 2001-02-20 | Xiang Li | Helical electrodeionization apparatus |
US6398965B1 (en) * | 1998-03-31 | 2002-06-04 | United States Filter Corporation | Water treatment system and process |
US6171374B1 (en) * | 1998-05-29 | 2001-01-09 | Ballard Power Systems Inc. | Plate and frame fluid exchanging assembly with unitary plates and seals |
US6056878A (en) * | 1998-08-03 | 2000-05-02 | E-Cell Corporation | Method and apparatus for reducing scaling in electrodeionization systems and for improving efficiency thereof |
US6197174B1 (en) * | 1998-11-25 | 2001-03-06 | E-Cell Corporation | Method and apparatus for electrodeionization of water using mixed bed and single phase ion exchange materials in the diluting compartment |
US6190553B1 (en) * | 1998-12-01 | 2001-02-20 | Sangeul Lee | Purification system for disposal of polluted or waste water using water plants |
US20030080467A1 (en) * | 1999-02-09 | 2003-05-01 | Andrews Craig C. | Microorganism control of point of use potable water sources |
US6190558B1 (en) * | 1999-04-01 | 2001-02-20 | Nimbus Water Systems, Inc. | Reverse osmosis purification system |
US6235166B1 (en) * | 1999-06-08 | 2001-05-22 | E-Cell Corporation | Sealing means for electrically driven water purification units |
US6214204B1 (en) * | 1999-08-27 | 2001-04-10 | Corning Incorporated | Ion-removal from water using activated carbon electrodes |
US6187162B1 (en) * | 1999-09-13 | 2001-02-13 | Leon Mir | Electrodeionization apparatus with scaling control |
US20010003329A1 (en) * | 1999-12-10 | 2001-06-14 | Asahi Glass Company, Limited | Electro-regenerating type apparatus for producing deionized water |
US6375812B1 (en) * | 2000-03-13 | 2002-04-23 | Hamilton Sundstrand Corporation | Water electrolysis system |
US6733646B2 (en) * | 2001-01-05 | 2004-05-11 | Kurita Water Industries Ltd. | Method and apparatus for electrodeionization of water |
US20030098266A1 (en) * | 2001-09-07 | 2003-05-29 | Lih-Ren Shiue | Fully automatic and energy-efficient deionizer |
US20030089609A1 (en) * | 2001-10-15 | 2003-05-15 | United States Filter Corporation | Apparatus for fluid purification and methods of manufacture and use thereof |
US20040079700A1 (en) * | 2002-10-23 | 2004-04-29 | Jonathan Wood | Production of water for injection using reverse osmosis |
Cited By (126)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050016932A1 (en) * | 2000-09-28 | 2005-01-27 | United States Filter Corporation | Electrodeionization device and methods of use |
US8721862B2 (en) | 2001-10-15 | 2014-05-13 | Evoqua Water Technologies Llc | Apparatus for fluid purification and methods of manufacture and use thereof |
US8101058B2 (en) | 2001-10-15 | 2012-01-24 | Siemens Industry, Inc. | Apparatus for fluid purification |
US20030089609A1 (en) * | 2001-10-15 | 2003-05-15 | United States Filter Corporation | Apparatus for fluid purification and methods of manufacture and use thereof |
US20080105548A1 (en) * | 2001-10-15 | 2008-05-08 | Siemens Water Technologies Corp. | Apparatus for fluid purification and methods of manufacture and use thereof |
US8192387B2 (en) | 2002-06-06 | 2012-06-05 | Nxstage Medical, Inc. | Last-chance quality check and/or air/pathogen filter for infusion systems |
US20080203023A1 (en) * | 2002-06-06 | 2008-08-28 | Nxstage Medical, Inc. | Last-chance quality check and/or air/pathogen filtger for infusion systems |
US10130746B2 (en) | 2003-01-07 | 2018-11-20 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US8202420B2 (en) | 2003-01-07 | 2012-06-19 | Nxstage Medical, Inc. | Batch filtration system for preparation of sterile fluid for renal replacement therapy |
US20100228177A1 (en) * | 2003-01-07 | 2010-09-09 | Brugger James M | Batch filtration system for preparation of sterile fluid for renal replacement therapy |
US7749393B2 (en) | 2003-01-07 | 2010-07-06 | Nxstage Medical, Inc. | Batch filtration system for preparation of sterile fluid for renal replacement therapy |
US8679348B2 (en) | 2003-01-07 | 2014-03-25 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
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US9388059B2 (en) | 2003-01-07 | 2016-07-12 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US8460558B2 (en) | 2003-01-07 | 2013-06-11 | Nxstage Medical, Inc. | Batch filtration system for preparation of sterile fluid for renal replacement therapy |
US20110186521A1 (en) * | 2003-01-07 | 2011-08-04 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US10420871B2 (en) | 2003-01-07 | 2019-09-24 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US11446417B2 (en) | 2003-01-07 | 2022-09-20 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US20090211975A1 (en) * | 2003-01-07 | 2009-08-27 | Brugger James M | Batch Filtration System for Preparation of Sterile Fluid for Renal Replacement Therapy |
US8114260B2 (en) | 2003-11-13 | 2012-02-14 | Siemens Industry, Inc. | Water treatment system and method |
US20110120886A1 (en) * | 2003-11-13 | 2011-05-26 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US20060157422A1 (en) * | 2003-11-13 | 2006-07-20 | Evgeniya Freydina | Water treatment system and method |
US8377279B2 (en) | 2003-11-13 | 2013-02-19 | Siemens Industry, Inc. | Water treatment system and method |
US8658043B2 (en) | 2003-11-13 | 2014-02-25 | Siemens Water Technologies Llc | Water treatment system and method |
US20110120953A1 (en) * | 2003-11-13 | 2011-05-26 | Siemens Water Technologies Holding Corp. | Water treatment system and method |
US8894834B2 (en) | 2003-11-13 | 2014-11-25 | Evoqua Water Technologies Llc | Water treatment system and method |
US8864971B2 (en) | 2003-11-13 | 2014-10-21 | Evoqua Water Technologies Llc | Water treatment system and method |
US20050263457A1 (en) * | 2004-05-27 | 2005-12-01 | Wilkins Frederick C | Water treatment system and process |
US20090127119A1 (en) * | 2004-11-02 | 2009-05-21 | The Water Company Llc | Electronic components associated and apparatus for deionization and electrochemical purification and regeneration of electrodes |
US20060096920A1 (en) * | 2004-11-05 | 2006-05-11 | General Electric Company | System and method for conditioning water |
US9700663B2 (en) | 2005-01-07 | 2017-07-11 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US11896750B2 (en) | 2005-01-07 | 2024-02-13 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US10973969B2 (en) | 2005-01-07 | 2021-04-13 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US20080230450A1 (en) * | 2005-01-07 | 2008-09-25 | Burbank Jeffrey H | Filtration System for Preparation of Fluids for Medical Applications |
US7955503B2 (en) * | 2005-03-18 | 2011-06-07 | Kurita Water Industries Ltd. | Pure water producing apparatus |
US20080156710A1 (en) * | 2005-03-18 | 2008-07-03 | Kurita Water Industries Ltd. | Pure Water Producing Apparatus |
US20060231406A1 (en) * | 2005-04-13 | 2006-10-19 | Usfilter Corporation | Regeneration of adsorption media within electrical purification apparatuses |
US7658828B2 (en) | 2005-04-13 | 2010-02-09 | Siemens Water Technologies Holding Corp. | Regeneration of adsorption media within electrical purification apparatuses |
US20060231495A1 (en) * | 2005-04-13 | 2006-10-19 | Usfilter Corporation | Regeneration of adsorption media within electrical purification apparatuses |
EP1885655A2 (en) * | 2005-06-01 | 2008-02-13 | Siemens Water Technologies Holding Corp. | Water treatment system and process |
EP1885655A4 (en) * | 2005-06-01 | 2012-05-02 | Siemens Industry Inc | Water treatment system and process |
US8318007B2 (en) * | 2005-08-31 | 2012-11-27 | Trojan Technologies | Ultraviolet radiation lamp and source module and treatment system containing same |
US20090090667A1 (en) * | 2005-08-31 | 2009-04-09 | Trojan Technologies Inc. | Ultraviolet radiation lamp and source module and treatment system containing same |
US20070215531A1 (en) * | 2006-03-17 | 2007-09-20 | Andreas Wawrla | Water-treatment appliance |
WO2007118235A3 (en) * | 2006-04-07 | 2008-12-04 | Nxstage Medical Inc | Filtration system for preparation of fluids for medical applications. |
US10926016B2 (en) | 2006-04-07 | 2021-02-23 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US20090182263A1 (en) * | 2006-04-07 | 2009-07-16 | Burbank Jeffrey H | Filtration system for preparation of fluids for medical applications |
US11633527B2 (en) | 2006-04-07 | 2023-04-25 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US9636444B2 (en) | 2006-04-07 | 2017-05-02 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US8469331B2 (en) | 2006-04-07 | 2013-06-25 | Nxstage Medical, Inc. | Filtration system for preparation of fluids for medical applications |
US7276155B1 (en) | 2006-05-04 | 2007-10-02 | Wastewater Technology, Inc. | Waste treatment apparatus with integral membrane apparatus |
US10550020B2 (en) | 2006-06-06 | 2020-02-04 | Evoqua Water Technologies Llc | Ultraviolet light activated oxidation process for the reduction of organic carbon in semiconductor process water |
US10343939B2 (en) | 2006-06-06 | 2019-07-09 | Evoqua Water Technologies Llc | Ultraviolet light activated oxidation process for the reduction of organic carbon in semiconductor process water |
US9592472B2 (en) | 2006-06-13 | 2017-03-14 | Evoqua Water Technologies Llc | Method and system for irrigation |
US8277627B2 (en) | 2006-06-13 | 2012-10-02 | Siemens Industry, Inc. | Method and system for irrigation |
US10625211B2 (en) | 2006-06-13 | 2020-04-21 | Evoqua Water Technologies Llc | Method and system for water treatment |
US8114259B2 (en) | 2006-06-13 | 2012-02-14 | Siemens Industry, Inc. | Method and system for providing potable water |
US20070284252A1 (en) * | 2006-06-13 | 2007-12-13 | Ganzi Gary C | Method and system for irrigation |
US20070284251A1 (en) * | 2006-06-13 | 2007-12-13 | Zuback Joseph E | Method and system for providing potable water |
US10252923B2 (en) | 2006-06-13 | 2019-04-09 | Evoqua Water Technologies Llc | Method and system for water treatment |
US9023185B2 (en) | 2006-06-22 | 2015-05-05 | Evoqua Water Technologies Llc | Low scale potential water treatment |
US9586842B2 (en) | 2006-06-22 | 2017-03-07 | Evoqua Water Technologies Llc | Low scale potential water treatment |
US20070295604A1 (en) * | 2006-06-23 | 2007-12-27 | Siemens Water Technologies Corporation | Electrically-driven separation apparatus |
US7820024B2 (en) | 2006-06-23 | 2010-10-26 | Siemens Water Technologies Corp. | Electrically-driven separation apparatus |
US20080067125A1 (en) * | 2006-09-20 | 2008-03-20 | Wilkins Frederick C | Method and apparatus for desalination |
US8182693B2 (en) | 2006-09-20 | 2012-05-22 | Siemens Industry, Inc. | Method and apparatus for desalination |
US7744760B2 (en) | 2006-09-20 | 2010-06-29 | Siemens Water Technologies Corp. | Method and apparatus for desalination |
US8337686B2 (en) | 2006-10-18 | 2012-12-25 | Kinetico Incorporated | Electroregeneration apparatus and water treatment method |
US20080164209A1 (en) * | 2007-01-05 | 2008-07-10 | Orest Zacerkowny | Water treatment systems and methods |
US9764968B2 (en) | 2007-04-03 | 2017-09-19 | Evoqua Water Technologies Llc | Method and system for providing ultrapure water |
US9011660B2 (en) | 2007-11-30 | 2015-04-21 | Evoqua Water Technologies Llc | Systems and methods for water treatment |
US9637400B2 (en) | 2007-11-30 | 2017-05-02 | Evoqua Water Technologies Llc | Systems and methods for water treatment |
US8585882B2 (en) | 2007-11-30 | 2013-11-19 | Siemens Water Technologies Llc | Systems and methods for water treatment |
US20100044286A1 (en) * | 2008-08-22 | 2010-02-25 | Takashi Menju | Water-Purification Pretreatment System |
US9223322B2 (en) * | 2009-03-03 | 2015-12-29 | Judo Wasseraufbereitung Gmbh | Method for operating a water softening system comprising target value control by a water removal station |
US20120024390A1 (en) * | 2009-03-03 | 2012-02-02 | Carsten Dopslaff | Method for Operating a Water Softening System Comprising Target Value Control by a Water Removal Station |
US8795531B2 (en) * | 2009-05-28 | 2014-08-05 | Mitsubishi Heavy Industries, Ltd. | Co-producing apparatus for salt and fresh water and co-producing method of the same |
US20110303606A1 (en) * | 2009-05-28 | 2011-12-15 | Mitsubishi Heavy Industries, Ltd. | Co-producing apparatus for salt and fresh water and co-producing method of the same |
US20110220371A1 (en) * | 2010-03-11 | 2011-09-15 | Halliburton Energy Services, Inc. | System and method for fluid treatment |
US20120181014A1 (en) * | 2011-01-14 | 2012-07-19 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
US20120181028A1 (en) * | 2011-01-14 | 2012-07-19 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
EP2665683A4 (en) * | 2011-01-17 | 2017-05-10 | Evoqua Water Technologies LLC | Method and system for providing ultrapure water |
US20130092530A1 (en) * | 2011-10-14 | 2013-04-18 | Samsung Electronics Co., Ltd. | Apparatus for producing electrolytic reduced water and control method thereof |
US9637397B2 (en) | 2011-10-27 | 2017-05-02 | Pentair Residential Filtration, Llc | Ion removal using a capacitive deionization system |
US8961770B2 (en) | 2011-10-27 | 2015-02-24 | Pentair Residential Filtration, Llc | Controller and method of operation of a capacitive deionization system |
US9695070B2 (en) | 2011-10-27 | 2017-07-04 | Pentair Residential Filtration, Llc | Regeneration of a capacitive deionization system |
US9903485B2 (en) | 2011-10-27 | 2018-02-27 | Pentair Residential Filtration, Llc | Control valve assembly |
US9010361B2 (en) | 2011-10-27 | 2015-04-21 | Pentair Residential Filtration, Llc | Control valve assembly |
US8671985B2 (en) | 2011-10-27 | 2014-03-18 | Pentair Residential Filtration, Llc | Control valve assembly |
US10189728B2 (en) * | 2011-12-13 | 2019-01-29 | Nxstage Medical, Inc. | Fluid purification methods, devices, and systems |
US10189727B2 (en) * | 2011-12-13 | 2019-01-29 | Nxstage Medical, Inc. | Fluid purification methods, devices, and systems |
US10947135B2 (en) | 2011-12-13 | 2021-03-16 | Nxstage Medical, Inc. | Fluid purification methods, devices, and systems |
US9724645B2 (en) | 2012-02-02 | 2017-08-08 | Tangent Company Llc | Electrochemically regenerated water deionization |
US9038725B2 (en) | 2012-07-10 | 2015-05-26 | Halliburton Energy Services, Inc. | Method and system for servicing a wellbore |
US10131553B2 (en) | 2013-01-30 | 2018-11-20 | 3M Innovative Properties Company | Electrochemical cells for supply of acid water |
US20140262233A1 (en) * | 2013-03-14 | 2014-09-18 | Ecolab Usa Inc. | Monitoring produced water |
US9341058B2 (en) * | 2013-03-14 | 2016-05-17 | Ecolab Usa Inc. | Monitoring produced water |
US9616388B2 (en) | 2013-03-15 | 2017-04-11 | Culligan International Company | Reverse osmosis system with an automated modulated bypass |
US9596973B2 (en) | 2013-03-21 | 2017-03-21 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US10702124B2 (en) | 2013-03-21 | 2020-07-07 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
WO2014153475A2 (en) * | 2013-03-21 | 2014-09-25 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
WO2014153475A3 (en) * | 2013-03-21 | 2014-11-20 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US11330960B2 (en) | 2013-03-21 | 2022-05-17 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US10105033B2 (en) | 2013-03-21 | 2018-10-23 | Seven Hour Drive, LLC | Auxiliary gray water source device for commercial kitchens |
US11084740B2 (en) | 2013-12-23 | 2021-08-10 | Coway Co., Ltd. | CDI-type water treatment method |
EP3088366A4 (en) * | 2013-12-23 | 2016-11-23 | Coway Co Ltd | Cdi-type water treatment device |
GB2557005A (en) * | 2016-10-13 | 2018-06-13 | Vws Uk Ltd | Method and apparatus for providing ultrapure water |
US10961144B2 (en) | 2016-10-13 | 2021-03-30 | Vws (Uk) Ltd. | Method and apparatus for providing ultrapure water |
GB2557005B (en) * | 2016-10-13 | 2022-02-02 | Vws Uk Ltd | Method of maintaining a capacitive deionisation unit |
US11684892B2 (en) | 2016-12-01 | 2023-06-27 | Pentair Residential Filtration, Llc | Water filtration system and method |
WO2018128757A3 (en) * | 2016-12-12 | 2018-08-09 | A. O. Smith Corporation | Water filtration system with recirculation to reduce total dissolved solids creep effect |
US11072551B2 (en) | 2016-12-12 | 2021-07-27 | A. O. Smith Corporation | Water filtration system with recirculation to reduce total dissolved solids creep effect |
US11820689B2 (en) | 2017-08-21 | 2023-11-21 | Evoqua Water Technologies Llc | Treatment of saline water for agricultural and potable use |
US11242269B2 (en) * | 2017-08-22 | 2022-02-08 | Allflow Equipamentos Industriais E Comercio Ltda. | System for recycling wastewater from reverse osmosis filtering processes and method for treating wastewater |
WO2019141724A1 (en) * | 2018-01-19 | 2019-07-25 | Gambro Lundia Ab | A water purification apparatus, and a method for optimizing efficiency of a water purification apparatus |
CN111836783A (en) * | 2018-01-19 | 2020-10-27 | 巴克斯特国际公司 | Water purification device and method for optimizing the efficiency of a water purification device |
US11939234B2 (en) | 2018-01-19 | 2024-03-26 | Baxter International Inc. | Optimizing efficiency of a water purification apparatus |
US11608282B2 (en) * | 2019-09-27 | 2023-03-21 | Magna Imperio Systems Corp. | Hybrid electrochemical and membrane-based processes for treating water with high silica concentrations |
US20210094846A1 (en) * | 2019-09-27 | 2021-04-01 | Magna Imperio Systems Corp. | Hybrid electrochemical and membrane-based processes for treating water with high silica concentrations |
CN110713230A (en) * | 2019-10-22 | 2020-01-21 | 珠海格力电器股份有限公司 | Water purifier recovery rate control method, device and system and water purifier |
WO2021077891A1 (en) * | 2019-10-22 | 2021-04-29 | 珠海格力电器股份有限公司 | Water purifier recovery rate control method, apparatus and system, and water purifier |
CN113401987A (en) * | 2020-03-16 | 2021-09-17 | 佛山市云米电器科技有限公司 | Water quality control method, household water purifying device and computer readable storage medium |
CN111646607A (en) * | 2020-07-07 | 2020-09-11 | 上海博丹环境工程技术股份有限公司 | Method and system for electrochemical oxidation treatment of organic wastewater applicable to low-salt condition |
US20220032215A1 (en) * | 2020-07-31 | 2022-02-03 | Cameron International Corporation | Separator electrical analysis |
WO2023028313A1 (en) * | 2021-08-27 | 2023-03-02 | Robert Bosch Gmbh | Deionization system with heat management |
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US8658043B2 (en) | 2014-02-25 |
WO2005049510A3 (en) | 2005-09-09 |
EP1685071A2 (en) | 2006-08-02 |
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TW200516059A (en) | 2005-05-16 |
JP2007513748A (en) | 2007-05-31 |
US20110120886A1 (en) | 2011-05-26 |
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