KR20170033611A - Water treatment system and water treatment method - Google Patents

Water treatment system and water treatment method Download PDF

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Publication number
KR20170033611A
KR20170033611A KR1020150131560A KR20150131560A KR20170033611A KR 20170033611 A KR20170033611 A KR 20170033611A KR 1020150131560 A KR1020150131560 A KR 1020150131560A KR 20150131560 A KR20150131560 A KR 20150131560A KR 20170033611 A KR20170033611 A KR 20170033611A
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South Korea
Prior art keywords
reverse osmosis
water
filtration unit
osmosis membrane
membrane
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KR1020150131560A
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Korean (ko)
Inventor
최석호
조환철
안혜련
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두산중공업 주식회사
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Priority to KR1020150131560A priority Critical patent/KR20170033611A/en
Publication of KR20170033611A publication Critical patent/KR20170033611A/en

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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
    • 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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • 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
    • B01D61/14—Ultrafiltration; Microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/02—Elements in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/04—Elements in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • B01D2321/185—Aeration

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Provided is a water treatment system. According to an embodiment of the present invention, the water treatment system comprises: a pretreatment filtration unit primarily filtrating introduced water; a continuous filtration unit filtrating the pretreated water by allowing the same to continuously pass through a recycling reverse osmotic membrane and a cartridge filter; and a reverse osmotic filtration unit treating the filtrated water by allowing the same to pass through a reverse osmotic membrane. According to the present invention, it is possible to remarkably reduce time and costs required in a water treatment process.

Description

[0001] Water treatment system and water treatment method [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment system and a water treatment method, and more particularly, to a water treatment system and a water treatment method capable of reusing a long-life reverse osmosis membrane and a back washable cartridge filter.

Water (water) treatment focuses on water safety, water pollution prevention, and water resource recycling, thereby reducing the use of chemicals rather than existing physico-chemical and biological processes, increasing the efficiency of installation space, and converting to a highly membrane- .

The membrane separation process is a process of passing a desired substance through a membrane and removing unwanted substances, or conversely, passing undesired substances and separating and recovering a desired substance.

For example, it is known that dissolved materials can be separated from the solvent using various types of selective membranes. Although the membrane separation process has not been considered technically important a short time ago, its use has been emphasized in many applications.

The separation membrane is generally divided into an ultrafiltration membrane, a microfiltration membrane, a nanofiltration membrane, and a reverse osmosis membrane. The membrane is divided into tubular, flat, spiral, wound, and hollow type.

Reverse osmosis membranes are useful for the desalination of semi-saline or seawater. They can be used to remove desalination from freshwater or pure water suitable for industrial, agricultural or household use. It can be provided in a large amount.

In more detail, the desalination process of semi-saline or seawater using a reverse osmosis membrane is a filtration process in which water passes through the brine but is separated by pressurization so that salts and other dissolved ions or molecules can not pass through.

In this filtration process, osmotic pressure is inevitably generated. The higher the concentration of the raw water, the higher the osmotic pressure is generated. Therefore, a higher pressure is required to treat the osmotic pressure. Therefore, in order for the reverse osmosis membrane to be commercially dechlorinated in large quantities in the semi-saline or seawater, it is necessary to have a high salt removal rate (salt removal rate). That is, for the commercial application of the reverse osmosis membrane, the salt rejection rate should be about 97% or more, and more preferably about 98.5% or more.

It is also necessary to meet permeate flow characteristics that allow relatively large amounts of water to pass through the membrane at relatively low pressures. Typically, the permeate flow rate of the membrane is at least 10 gallon / ft2day (gfd) at 800 psi for seawater, Above 15gallon / ft2day (gfd) at 225psi pressure is required. Generally, depending on the application, a higher permeate flux than the salt exclusion rate may be important, and conversely, the salt exclusion rate may be important.

An example of a conventional water treatment system using such a reverse osmosis membrane is shown in FIGS. 1 and 2. FIG.

1 and 2, a conventional water treatment system is configured such that water supplied by the feed pump 42 is treated in the pretreatment filtration facility 10 and then passed through the cartridge filter 20 by the feed pump 40 And the filtered water is configured to flow into the reverse osmosis membrane filtration facility 30.

In the conventional water treatment system, the pretreatment and filtration apparatus 10 and the cartridge filter 20 are separately installed and operated in the stage prior to the reverse osmosis membrane filtration facility 30.

For example, when the water treatment system is continuously operated, foreign matter adheres to the pretreatment filtration apparatus 10 and the cartridge filter 20, and the function thereof is lost. At this time, the pretreatment filtration apparatus 10 Foreign matter is removed at regular intervals by the air introduced from the air blower 50 and / or the backwash water supplied through the backwash water supply pump 43. However, since the cartridge filter 20 is used in a single use and then discarded and replaced, This increases the cost of operating the system.

In addition, the lifetime of RO membranes is determined by permeate flow rate and salt rejection rate. If it is not recovered by washing due to decrease of flow rate due to membrane contamination during operation or deterioration of salt rejection rate due to oxidation, However, conventionally, there has been a problem in that, in the same system, the cartridge filter and the reverse osmosis membrane are separately purchased separately and then discarded separately after use.

Korean Patent Publication No. 10-2013-0032137

The present invention can reuse the reusable reverse osmosis membrane and the cartridge filter which are difficult to process and have a high disposal cost by reusing the reusable reverse osmosis membrane and using the backwashable cartridge filter once more, And the water treatment system and the water treatment method which can improve the economical efficiency and the efficiency can be provided.

The objects of the present invention are not limited to those described above, and other objects of the present invention which are not mentioned can be deduced from the following description.

A water treatment system according to an embodiment of the present invention includes: a continuous filtration unit for continuously passing water through a reuse reverse osmosis membrane and a cartridge filter to perform filtration; And a reverse osmosis filtration unit for treating the filtered water through a reverse osmosis membrane.

In one embodiment, the continuous filtration unit comprises: a vessel; At least one reusable reverse osmosis membrane disposed on an inlet side of the vessel; And at least one cartridge filter installed at the outlet side of the vessel.

In one embodiment, the continuous filtration unit may be arranged in a pressure or gravity manner.

In one embodiment, the continuous filtration unit may be installed horizontally or vertically.

In one embodiment, the reusable reverse osmosis membrane is used in the reverse osmosis filtration unit and the aged reverse osmosis membrane is applied in the form of a cartridge.

In one embodiment, the cartridge filter may be a back washable cartridge filter.

In one embodiment, the continuous filtration unit may further include a pretreatment filtration unit to which at least one of an ultrafiltration membrane, a microfiltration membrane, a reuse reverse osmosis membrane, a pressurized floating unit, and a double filtration unit is applied to a front end of the continuous filtration unit.

In one embodiment, the pretreatment filtration unit and the continuous filtration unit may further include a backwash water tank connected via a backwash water supply pump.

In one embodiment, chlorine may be introduced into the backwash water supplied to the pretreatment filtration unit and the continuous filtration unit.

In one embodiment, the air filtering apparatus may further include an air blower for supplying air to the pre-filtration unit.

According to another aspect of the present invention, there is provided a water treatment method including: a water supply step of supplying water to be treated; A pretreatment filtration step in which the suspended solids and contaminants contained in the water are primarily filtered; A continuous filtration step in which the primary filtered water is filtered through a continuous cartridge filter having a reverse osmosis membrane and a cartridge filter; And a reverse osmosis step of passing the filtered water through a reverse osmosis membrane.

In one embodiment, the first filtration step may be performed using at least one of an ultrafiltration membrane, a microfiltration membrane, a reuse reverse osmosis membrane, a pressure floating unit, and a double filtration unit.

In one embodiment, in the continuous filtration step, the aged reverse osmosis membrane is immersed in an oxidizing agent solution, washed, and then reused.

In one embodiment, in the continuous filtration step, the cartridge filter and the aged reverse osmosis membrane may be reused after being cleaned using micro bubbles.

According to the embodiment of the present invention, it is possible to recycle the reusable reverse osmosis membrane, which is difficult to process and has a high disposal cost, and can reduce the time and cost consumed in the water treatment process by using the back washable cartridge filter.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a conceptual diagram showing a general water treatment system.
Fig. 2 is a process diagram schematically showing the water treatment system according to Fig. 1;
3 is a conceptual diagram showing a water treatment system according to the present invention.
FIG. 4 is a process diagram schematically showing the water treatment system according to FIG. 3; FIG.
5 is a perspective view showing a filtering apparatus of the water treatment system according to FIG.
6A to 6D are schematic views showing application examples of the water treatment system of the present invention, respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3, the water treatment system according to one embodiment includes a pre-treatment filtration unit 100, a continuous filtration unit 200, and a reverse osmosis filtration unit 300.

The pretreatment filtration unit 100 is for primarily filtering impurities contained in the water before sending the introduced water to the continuous filtration unit 200.

In the embodiment of the present invention, the continuous filtration unit 200 and the reverse osmosis filtration unit (hereinafter, referred to as " water filtration unit " 300, a relatively rough filtration process can be performed.

The pretreatment filtration unit 100 may include at least one of an ultrafiltration membrane (UF), a microfiltration membrane (MF), a reuse reverse osmosis membrane (RO), a pressurized floating apparatus (DAF), and a double filtration apparatus (DMF). Details thereof will be described later with reference to Figs. 6A to 6D.

The continuous filtration unit 200 may filter the pretreated and filtered water, and at least one of the reuse reverse osmosis membrane 220 and the cartridge filter 230 may be used.

As the solute of the raw water is blocked by the separation membrane, clogging and fouling and scaling due to the adhered layer may occur and the filtration function may be deteriorated.

In the embodiment of the present invention, the continuous filtration unit 200 is a continuous arrangement of a reuse reverse osmosis membrane and a cartridge filter so as to prevent deterioration of the filtration function of the separation membrane and to reduce the cost of the water treatment process.

The reusable reverse osmosis membrane 220 can be used in the reverse osmosis filtration unit 300 so that the aged reverse osmosis membrane can be used in the form of a cartridge so that the coarse particles can be filtered though the fine filtration function can not be performed. Therefore, the reusable reverse osmosis membrane 220 filters coarse particles, and the cartridge filter 230 can filter the fine particles. At this time, as the cartridge filter, a backwash cartridge filter may be applied.

In FIG. 3, the reusable reverse osmosis membrane 220 is disposed at the front end of the cartridge filter 230, but is not limited thereto. For example, the reusable reverse osmosis membrane may be disposed at the rear end of the cartridge filter or at both the front end and the rear end.

The reverse osmosis filtration unit 300 can simultaneously reduce or eliminate the chemical oxygen demand (COD), the biochemical oxygen demand (BOD), the TN, the total phosphorus (TP), the coliform bacteria, the appearance and the smell in the discharged wastewater.

The reverse osmosis filtration unit 300 is in the form of a polyamide composite membrane comprising a porous support and a polyamide membrane formed by interfacial polymerization of a polyfunctional amine and a polyfunctional acyl halide on a porous support.

The lifetime of the reverse osmosis filtration unit 300 is determined by the permeation flow rate and the salt rejection rate. If the reverse osmosis filtration unit 300 is not recovered by washing due to a decrease in flow rate due to film contamination occurring during normal operation or a decrease in salt rejection rate due to oxidation However, according to the embodiment of the present invention, the aged reverse osmosis membrane can be installed in the continuous filtration unit 200 and reused to induce a cost saving effect.

The water treatment process using the water treatment system will be described with reference to FIG.

The water treatment process according to an embodiment of the present invention includes a water supply step, a pre-treatment filtration step, a continuous filtration step, and a reverse osmosis filtration step.

The water supply step is a step of supplying water to be treated, and the water is supplied to a pre-treatment filtration step through a village water supply pump or a feed pump of an underground water supply source.

For reference, the area where the water treatment system according to one embodiment can be installed may be a book site, a military site, a short-term camp site, a sewage-contaminated site, a place requiring maintenance of water facilities, a training center, a social welfare facility, etc. have.

In the present invention, when the water quality of ground water or village water intake is contaminated with nitrate nitrogen, fluorine, residual pesticide, bacteria, chlorine-resistant protozoa, etc., Can be removed and the minerals necessary for the human body can be maintained to produce / supply safe and delicious drinking water.

The capacity of the water tank in which the water is stored in the water supply step can be determined according to the water intake amount, and the storage capacity adjustment method can be automatically controlled and operated by the water level sensor.

The pretreatment filtration step is a step of removing solids, foreign matter, taste, odor, etc. from the water supplied from the water tank. In the pretreatment filtration step, an appropriate water treatment process can be selectively performed according to the water quality of the supplied water.

The water after the pre-filtration step is subjected to a continuous filtration step at a constant pressure. At this time, a feed pump may be used to apply sufficient pressure. The raw water supply pump can regulate the water pressure of the raw water provided to the continuous filtration step.

In the continuous filtration step, the water is filtered while continuously passing the reuse reverse osmosis membrane (220) and the cartridge filter (230). The cartridge filter may be provided with an appropriate size of activated carbon so as to have a sufficient filtering function.

Through the continuous filtration step, the organic matter such as taste, odor component and residual pesticide component in the water can be adsorbed and the turbidity-inducing substance can be removed therefrom.

Next, the water is transferred from the continuous filtration step to the reverse osmosis filtration step. In the reverse osmosis filtration step, a module type reverse osmosis filtration unit 300 using a reverse osmosis membrane is used. The reverse osmosis filtration unit 300 is composed of a porous support, And the polyamide thin film formed by the interfacial polymerization of the polyfunctional acyl halide may be made of a spiral wound type and poly amide is used as the material but the material is not limited as long as it has the same action and effect .

A feed pump may be installed to increase the water pressure of the water before the water enters the reverse osmosis filtration step.

The operating pressure varies depending on the water quality and the temperature production capacity, but can be operated at about 8 kg / cm 2 to 12 kg / cm 2. The application pH is preferably in the range of 3 to 10, There is a number.

The reverse osmosis membrane used in the reverse osmosis filtration unit 300 used in the embodiment of the present invention has a salt removal rate of 99% or more, and nitrate nitrogen, organic matter, fluorine, heavy metal components and the like are removed by 90% or more.

In this case, 100% of the protozoa such as bacteria and 3-6 μm sized Cryptosporidium and Giadia are removed.

The concentrated water including the nitrate nitrogen component, the organic matter, the protozoa, etc. filtered by the reverse osmosis filtration unit 300 can be discharged without being supplied to the purified water tank (not shown).

As the water passes through the continuous filtration step and the reverse osmosis filtration step, it meets the drinking water quality standard and can be safely eaten. However, there is a possibility that the inside of the pipe may be contaminated by bacteria during the long- , Chlorine can be added to maintain the residual chlorine 0.2 mg / ℓ defined in the water law of Korea.

In the embodiment of the present invention, each filtering step can be controlled at the site where the operation conditions and the water quality conditions are installed, but remote monitoring and control are also possible if necessary communication equipments are provided.

When the water treatment process is performed to some extent, contaminants gradually get caught in the pre-treatment filtration unit 100 and the continuous filtration unit 200, and the speed of the water passing through each filtration unit gradually decreases.

At this time, the pre-treatment filtration unit 100 can be cleaned by allowing air to flow in through the air blower 500. In addition, the cleaning of the reuse reverse osmosis membrane 220 and the cartridge filter 230, which constitute the continuous filtration unit 200, You can proceed at the same time.

5, the continuous filtration unit 200 according to one embodiment includes a vessel 210 having a predetermined volume, a reuse reverse osmosis membrane 220 installed at one side of the vessel 210, a vessel 210 And a cartridge filter 230 installed on the other side of the cartridge filter 230.

The vessel 210 is formed of a hollow cylindrical body having an inlet through which the water to be filtered flows in one side and an outlet through which the filtered water is discharged in the other side.

The reusable reverse osmosis membrane 220 recycles the reverse osmosis membrane used in the reverse osmosis filtration unit 300 and may be configured in the form of a cartridge. For example, the reusable reverse osmosis membrane 220 has a case having a corresponding outer diameter to be inserted into the vessel 210, and a water flow path 221 may be formed at the longitudinal center thereof.

A plurality of cartridge filters 230 may be disposed behind the reuse reverse osmosis membrane 220. Each cartridge filter 230 has a casing having an outer diameter smaller than the inner diameter of the vessel 210, and a water flow passage 231 may be formed at the longitudinal center thereof. A plurality of hollow fiber membranes (not shown) may be provided inside the case, and activated carbon may be adhered to the hollow fiber membranes. In particular, fibrous activated carbon in staple form can be applied as activated carbon.

The fibrous activated carbon in the form of staple may be made of phenol, viscose precursor, acrylonitrile or petroleum pitch as the raw material, and the size of the staple may be 3 to 20 mm.

Therefore, the water introduced from the pre-filtration step passes through the inlet of the vessel 210 and the flow path of the reuse reverse osmosis membrane 220, and a part of the water can be filtered through the plurality of cartridge filters 230, The remainder may be discharged to the outlet of the vessel through the gap between the cartridge filter and the cartridge filter.

On the other hand, when the continuous filtration unit 200 is to be washed, the backwash water supplied from the backwash water supply pump 420 is introduced into the vessel 210 of the continuous filtration unit 200, Is simultaneously injected into the reuse reverse osmosis membrane (220) and the backwashing cartridge filter (230), and foreign substances adhered to each of them can be removed by micro bubbles of the backwash water thus introduced.

In addition, the aged reverse osmosis membrane may be washed using an oxidizing agent solution. For example, when the aged reverse osmosis membrane is immersed in an oxidant tank storing a sufficient amount of the oxidizing agent solution, foreign substances adhering to the aged reverse osmosis membrane can be removed after a predetermined time.

Examples of application of the water treatment system of the present invention as described above are shown in Figs. 6A to 6D.

6A, the water treatment system of the present invention includes a pretreatment filtration unit, a continuous filtration unit 200 and a reverse osmosis filtration unit 300, and an ultrafiltration membrane or microfiltration membrane 101 can be used as a pretreatment filtration unit have.

The ultrafiltration membrane is one of the polymer separation membranes with pressure propulsion. It blocks the polymer and colloidal materials in the solution, while it permeates water and relatively small molecules.

The membrane has a two-layer structure and is divided into a thin film of a surface having a pore size of 40 Å or less and a fine pore film of 100 Å or more. The surface thin film has a separating function. Examples of the material of the membrane include cellulose and polyacrylonitrile.

The microfiltration membrane is one of the polymer separation membranes, and has micropores of about 0.01 to 10 μm, and inhibits the suspension, colloidal particles, bacteria and the like.

Since the pores of the membrane are extremely minute, it is important that the pores are not blocked, and the structure of the membrane, such as the shape and distribution of the pores, is more important than the material of the membrane. For this reason, cellulosic, vinyl chloride, polycarbonate, fluororesin, and the like can be applied as the material of the film.

The structure of the ultrafiltration membrane and the microfiltration membrane may be formed of a hollow fiber type or a spiral wound type and the material thereof may be selected from the group consisting of PS (Poly Sulfone), PVDF (Poly Vinylidene Floride), PE (Poly Ethylene) (Poly Acyryl Nitrile) or the like is used, but materials having the same action and effect are not limited.

Referring to FIG. 6B, the water treatment system of the present invention may use the reuse reverse osmosis membrane 102 as a pretreatment filtration unit.

When a solution having a concentration difference is separated into a semi-permeable membrane, water of a low concentration solution moves toward a high concentration solution after a certain time, and a water level difference occurs. This phenomenon is called osmotic phenomenon, and the level difference that occurs at this time is called osmotic pressure. On the other hand, when the pressure of the osmotic pressure is applied to the high concentration solution again, the water moves toward the low concentration solution. This phenomenon is called reverse osmosis, and the semipermeable membrane used at this time is called reverse osmosis membrane.

The process of separating the materials using the reverse osmosis phenomenon is performed by combining the physical and chemical characteristics of the reverse osmosis membrane, the physical and chemical characteristics of the materials to be separated, and the pressure difference as the driving force.

Normally, the reverse osmosis membrane separates inorganic compounds more than organic compounds and electrolytes better than non-electrolytes. The charge is higher in the electrolyte, and the larger the ion radius or the larger the size of the molecule, the better the separation. The area that can be filtered by RO membranes can remove not only particulate matter but also ionic substances having a particle size of 1 nm or less.

In an embodiment of the present invention, the reverse osmosis membrane used in the reverse osmosis filtration unit 300 may be applied to the reuse RO membrane.

Referring to FIG. 6C, the water treatment system of the present invention can use the pressurized floating apparatus 103 as the pretreatment filtration unit.

Dissolved Air Flotation (DAF) is a device that causes air bubbles to float on the surface of solid particles contained in the source water.

In other words, it is difficult to process the organic material because it is hard to sink even when it is flocculated. However, if the pressurized floating device is used, the flock can be removed by floating lightly have.

Referring to FIG. 6D, a dual filtration unit 104 may be used as a pretreatment filtration unit for use in the water treatment system of the present invention.

A dual media filter (DMF) is a device that removes solid particles contained in source water through a granular layer (Ex.

The double filtration device uses anthracite, sand, garnet, gravel, activated carbon, etc. as a filter material to be filled therein, and filters the water by filling a filter material of different particle size in each filling step.

The filtration speed varies depending on the used filter medium. In general, filtration by sand is performed at a flow rate of 7 to 8 m / hr, and an anthracite or activated carbon is designed at a flow rate of 15 m / hr.

In addition to suspended substances, water contains various metals, organic substances, flavors, and odors. By using activated carbon as a filter medium, it is possible to selectively adsorb organic matter, taste, and odor in water.

The principle of the treatment is to fill the inside of the device with activated carbon, and when the water passes through the upper part of the device, the taste, smell and the like of the water is absorbed by the numerous pores of the activated carbon.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be.

That is, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

Accordingly, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100; Pretreatment filtration unit
200; Continuous filtration unit 210; Bessel
220; A reuse RO membrane 230; Cartridge filter
300; Reverse osmosis filtration unit
400; Pump
500; Air blower

Claims (14)

A continuous filtration unit for continuously passing the water through a reuse-use reverse osmosis membrane and a cartridge filter to perform filtration;
A reverse osmosis filtration unit for treating the filtered water through a reverse osmosis membrane;
≪ / RTI >
The method according to claim 1,
The continuous filtration unit includes:
Bessel;
At least one reusable reverse osmosis membrane disposed on an inlet side of the vessel;
At least one cartridge filter installed at an outlet side of the vessel;
Wherein the water treatment system comprises:
3. The method of claim 2,
Wherein the continuous filtration unit is arranged in a pressure or gravity manner.
3. The method of claim 2,
Wherein the continuous filtration unit is installed horizontally or vertically.
The method according to claim 1,
Wherein the reusable reverse osmosis membrane is used in the reverse osmosis filtration unit and the aged reverse osmosis membrane is applied in the form of a cartridge.
The method according to claim 1,
Wherein the cartridge filter is a back washable cartridge filter.
The method according to claim 1,
Further comprising a pretreatment filtration unit to which at least one of an ultrafiltration membrane, a microfiltration membrane, a reuse reverse osmosis membrane, a pressurized floating unit, and a double filtration unit is applied to a front end of the continuous filtration unit.
The method according to claim 1,
And a backwash water tank connected to the pre-filtration unit and the continuous filtration unit via a backwash water supply pump.
9. The method of claim 8,
And chlorine is introduced into the backwash water supplied to the pre-treatment filtration unit and the continuous filtration unit.
The method according to claim 1,
Further comprising an air blower for supplying air to the pre-filtration unit.
A water supply step of supplying water to be treated;
A pretreatment filtration step in which the suspended solids and contaminants contained in the water are primarily filtered;
A continuous filtration step in which the primary filtered water is filtered through a continuous cartridge filter having a reverse osmosis membrane and a cartridge filter;
A reverse osmosis step of passing the water filtered by the continuous filtration unit through a reverse osmosis membrane;
≪ / RTI >
12. The method of claim 11,
Wherein the pre-filtration step is performed using at least one of an ultrafiltration membrane, a microfiltration membrane, a reuse reverse osmosis membrane, a pressurized floating unit, and a double filtration unit.
12. The method of claim 11,
Wherein the aged reverse osmosis membrane is immersed in an oxidant solution to be washed and reused in the continuous filtration step.
12. The method of claim 11,
Wherein in the continuous filtration step, the cartridge filter and the aged reverse osmosis membrane are washed using microbubbles of backwash water and then reused.
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CN108793331A (en) * 2018-06-12 2018-11-13 合肥丰洁生物科技有限公司 A kind of film concentrator easy to clean
KR20190088180A (en) * 2018-01-18 2019-07-26 두산중공업 주식회사 Seawater Desalination Plant and Control Method for the same
KR102029623B1 (en) * 2019-03-29 2019-10-08 김귀봉 Method and and apparatus for recycling livestock excretions using reverse osmosis

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KR20130032137A (en) 2011-09-22 2013-04-01 (주) 정수엔지니어링 An activated carbon watertreatment device and the watertreatment system and the method using thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190088180A (en) * 2018-01-18 2019-07-26 두산중공업 주식회사 Seawater Desalination Plant and Control Method for the same
CN108793331A (en) * 2018-06-12 2018-11-13 合肥丰洁生物科技有限公司 A kind of film concentrator easy to clean
KR102029623B1 (en) * 2019-03-29 2019-10-08 김귀봉 Method and and apparatus for recycling livestock excretions using reverse osmosis

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