WO2017033131A1 - Système d'activation électrochimique - Google Patents

Système d'activation électrochimique Download PDF

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Publication number
WO2017033131A1
WO2017033131A1 PCT/IB2016/055032 IB2016055032W WO2017033131A1 WO 2017033131 A1 WO2017033131 A1 WO 2017033131A1 IB 2016055032 W IB2016055032 W IB 2016055032W WO 2017033131 A1 WO2017033131 A1 WO 2017033131A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrochemical activation
activation system
cells
water
disinfectant
Prior art date
Application number
PCT/IB2016/055032
Other languages
English (en)
Inventor
Abhinav KANTI
Bipin Agarwal
Sundaresan S
Vinay NEHRA
Vivek KACKER
Original Assignee
M/S Faith Innovations
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by M/S Faith Innovations filed Critical M/S Faith Innovations
Publication of WO2017033131A1 publication Critical patent/WO2017033131A1/fr

Links

Classifications

    • 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
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/02—Process control or regulation
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46119—Cleaning the electrodes
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C02F2001/4619—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water only cathodic or alkaline water, e.g. for reducing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4618—Supplying or removing reactants or electrolyte
    • C02F2201/46185—Recycling the cathodic or anodic feed
    • 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
    • C02F2209/42—Liquid level
    • 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
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention

Definitions

  • the invention relates to improved electrochemical activation systems, more particularly, to electrochemical activation systems comprising a flow-through electrochemical ceil (FEM), and electrolvsis of solutions therein.
  • FEM flow-through electrochemical ceil
  • chemical electrolysis generally occurs in an electrochemical cell, wherein an electric current is passed through either a solution of a solute, commonly aqueous, ionic substance or a molten ionic substance. Electrolysis processes produce new chemical species, which can subsequently take part in chemical reactions at the cell cathode and anode to form new compounds.
  • electrolysis cells cannot be used by themselves for producing electrochemically-activated preparations on a continuous and/or industrial scale. In order to enable continuous and industrial scale use, these electrolysis cells must be incorporated into systems that support their functioning and allow them to operate reliably by providing, for example, electricity and suitable feed stock and continuously removing products and waste streams.
  • electrolytic cells In conventional electrochemical activation systems, electrolytic cells have a limited lifespan as foreign matter deposits on electrodes and membranes, eventually coating the electrodes and blocking the membranes beyond operational limits. These deposits are dissolved and cleaned from the electrodes a number of times to extend the lifetime of the electrolytic cells until the electrolytic cells are no longer able to produce activated solutions with the required efficacy, at which time the electrolytic cells are discarded. These deposits also form in other parts of the system, such as connecting tubing and valves.
  • an electrochemical activation operation is periodically interrupted at relatively frequent intervals to clean the electrodes, particularly the cathode, of scale and precipitates that accumulate and form a deposit on it.
  • Another known metbodto de-scale the electrodes is the periodic reversal of polarity between an anode and a cathode.
  • this method suffers from the disadvantages such as in many- cases polarity reversal is not possible or energy efficient. Further, it may have effect the dissolution of the cathode and it may deteriorate the quality of the cathode coating.
  • the devices usually have manually operated cleaning system. Through manual operation a user normally conducts a de-scaling operation on-site.
  • quality of the product(s) is monitored manually and periodically and process variables are adjusted as needed to maintain quality and hence it requires continuous on-site presence of trained personnel.
  • ECA electrochemical activation system
  • Yet another object of the invention is to provide an electrolytic housing suitable for use within the electrochemical activation system.
  • Yet another object of the invention is to provide a method to ensure long life of electrolytic cells within an electrochemical activation system.
  • Yet another object of the invention is to provide a method for the management of an electrochemical activation system.
  • Yet another object of the invention is to provide a method that is adapted for the production of stable electrochemically-activated solutions, on a continuous and industrial scale, and for a longer period.
  • Yet another object of the invention is to provide a method of cleaning the membranes (electrolytic cells) for the production of quality disinfectant for a longer period of time.
  • FIG. 1 is a diagrammatic illustration of an electrochemical activation system of the type described
  • FIG. 2 is a diagrammatic illustration of a control system which controls operation of the system shown in FIG. 1
  • the invention further relates to a method for the management of an electrolytic cell exchange system that is adapted for the production of stable electrochemically-activated solutions, on a continuous and industrial scale, and for a longer period.
  • the electrolysis process used in the present invention is based on the known ECA technology (Electro - Chemical Activation).
  • the ECA technology is based on an electrolysis process with water and possibly salt, for instance sodium chloride, as raw materials.
  • Cell comprises of Cathode and anode segregated by a semi-permeable membrane.
  • a suitable cell is a Flow Electrolyte Module (FEM) cell.
  • FEM Flow Electrolyte Module
  • EOW an anolyte solution and catholyte solution
  • the EOW can be used as disinfectant.lt is possible to envisage disinfection of food, medical instruments, spaces, surfaces and water sources.
  • the EOW can be used in all phases (as ice, liquid or gas).
  • Figure 1 shows a diagram of a device for producing an electrochemically activated solution, such as an anolyte or a catholyte solution, such as Electrolyzed Oxidized Water (EOW).
  • Device comprises a first control unit or processor such as CIC with display connected to main electrochemical unit housing cells, one or more salt reservoirs, one or more treated water reservoirs and a reservoir for the produced solution i.e. disinfectant according to the invention.
  • a first control unit or processor such as CIC with display connected to main electrochemical unit housing cells, one or more salt reservoirs, one or more treated water reservoirs and a reservoir for the produced solution i.e. disinfectant according to the invention.
  • the electrochemical activation system has an array of Solenoid valves and pumps suitably located inside the system. This array is electrically connected to the Central Intelligence Controller.
  • the system accommodates one or more electrolytic cells therein so as to produce anolyte and catholyte with particular physical and chemical characteristics, with specific conductivity and pH and quantity of oxidants as desired.
  • the system further houses FEM cells which produce anolyte at pH level 7+1 and input water after conditioning is also at pH level 7+1.
  • the electrochemical activation system comprises of an inlet for water to water treatment unit with reservoir and an inlet for the electrolyte, which is preferably supplied in the form of a salt solution. Both the water treatment unit and inlet for electrolyte are connected to main electrochemical unit housing cells.
  • the produced disinfectant in this case Electrolyzed Oxidized Water (EOW), is delivered to disinfectant reservoir and the catholyte is discarded
  • the electrochemical activation system further has a mechanism to control the output dilution of the disinfectant.
  • the pressing of button B l opens up Relays Rl, R2, R3 and the pressing of button B l close down Replay R4.
  • the shutdown process of R4 opens up SVl (Solenoid valve 1) and the opening of SVl will start the working of Booster and pump.
  • SV3 always remains open and undiluted disinfectant from disinfectant reservoir passes through S V3 and the treated water from the reservoir comes through SVl.
  • the reservoir may have the treated water.
  • the reducer in line between Booster and SVl is set in such a manner that the quantity of water passing through reducer is 3 times the quantity of Disinfectant coming out of SV3. This is done manually after choosing the booster and pump of required flow rate. This ensures that 1:4 diluted disinfectant comes out of the outlet nozzle.
  • the operator presses button B2 which open the Relays Rl, R2, and R4 are open and the pressing of button B2 close down Relay R3 which leads to opening up of SV2 and SV3.
  • the Booster and pump start working. Reducer in line of booster and SV2 is set in such a manner that same quantity of water and disinfectantis passed through to output. This ensures that 1:2 diluted disinfectant comes out of output nozzle.
  • the operator presses button B3 which opens up the Relays Rl and R2 open and it close down Relays R3 and R4.
  • the closing of Relays R3 and R4 would start the operation of the pump only and it enables SV3 to open. This ensures that undiluted disinfectant comes out of the output nozzle.
  • the electrochemical activation system further incorporates a Central Intelligent Controller (“CIC”) to facilitate control and administration of the (electrochemical system) electrolytic cells.
  • CIC Central Intelligent Controller
  • membranes are used for bringing down Tds of the raw water. These membranes basically absorb the scale forming elements in water and help bringing down the Tds of the water. During regular functioning of such systems it is observed that these systems work for a specific period of time after which they go to stand-by mode. In the prior art it was observed that during this stand-by mode the membranes are filled with high Tds water which causes accelerated choking of the membranes.
  • the CIC further automatically cleans the membranes of the water treatment unit with clean water immediately before the end of the production cycle i.e. during the standby mode of the disinfectant.
  • the water treatment unit has a system with flushing cycle of a predetermined time which can be varied according to the size of the water treatment unit. In one embodiment, the flushing cycle is of 35 minutes. In the present invention, for 30 minutes, hydroprep will function normally and the treated water will be pumped into reservoir. After the cycle of 30 minutes, the hydropep will stop and the treated water is pumped into membranes in reverse and drained out for the last 5 minutes. The system ensures the long life of membranes by cleaning the membranes with clean water after every cycle of production of the treated water.
  • the invention further relates to a novel method of self cleaning wherein the method comprises the steps of automatically cleaning the membranes of the water treatment section with clean water immediately before the end of every production cycle.
  • the method of self-cleaning of the membranes comprises of flushing cycle of a predetermined time which can be varied according to the size of the water treatment unit.
  • the flushing cycle is of 35 minutes.
  • hydroprep will function normally and the treated water will be pumped into reservoir.
  • the hydropep will stop and the treated water is pumped into membranes in reverse and drained out for the last 5 minutes.
  • the novel self-cleaning method ensures the long life of membranes by cleaning the membranes with clean water after every cycle of production of the treated water.
  • the CIC of ECA system gets constant feedback of running time of the system and also feedback of current levels in the cells.
  • the system goes into automated descaling of cells (using weak acid) upon predetermined elapse of time or when the current level goes below a predetermined limit.
  • the CIC of the present invention ensures automatic flushing out of catholyte and anolyte and filling of reactor with clean water during shutdown. This ensures that fresh water is remained inside the cells instead of Catholyte and Anolyte during shutdown which in turn ensures longer life of cells and is the reason of lesser breakdowns lesser scaling of FEM cells.
  • the present invention incorporates a novel method of cleaning the membranes (cells) for the production of quality of disinfectant for a longer period of time.
  • the system ensures automatic flushing out of catholyte and anolyte and filling of reactor with clean water during shutdown.
  • the novel method comprises the step of automatic flushing out of catholyte and anolyte during shutdown, cleaning the cells with the fresh water, removing said water from the cells and filling the cells with the fresh water. This novel method of cleaning the cells results in long life of cells and efficient working of the system.
  • the disinfectant reservoir and water treatment reservoir have sensors which would provide indications to the controller about level of water and the disinfectant. In case of water level being lower than the prescribed limit and /or disinfectant level being lower than the prescribed limit the sensors will provide the input to the controller which would enable the display unit to display the error to the user and in that case the functioning of the electrochemical activation system will stop.
  • the electrochemical activation system also may include a power supply unit (“PSU”), suitable for providing required levels of power to the system during operation of the same.
  • PSU power supply unit
  • the invention enables the system to have efficient control over the quality of solutions produced oyer longer period of time.

Abstract

L'invention concerne un système d'activation électrochimique qui comprend une cellule qui est conçue pour produire la solution activée électro-chimiquement, telle qu'une solution d'anolyte ou de catholyte, au moyen d'un procédé d'électrolyse. Le système d'activation électrochimique tel que décrit ci-dessus présente en outre un nouveau système qui nettoie automatiquement les cellules. Le système pourrait passer en mode de rinçage si le temps est écoulé, ou si la limite de courant passe au-dessous du niveau défini. Le système d'activation électrochimique comprend en outre un indicateur de temps de rinçage conjointement avec un indicateur de courant pour celui-ci. L'invention concerne également un nouveau procédé pour celui-ci.
PCT/IB2016/055032 2015-08-27 2016-08-23 Système d'activation électrochimique WO2017033131A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2674/DEL/2015 2015-08-27
IN2674DE2015 2015-08-27

Publications (1)

Publication Number Publication Date
WO2017033131A1 true WO2017033131A1 (fr) 2017-03-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3378968A1 (fr) * 2017-03-21 2018-09-26 Kabushiki Kaisha Toshiba Dispositif et procédé électrolytiques de dioxyde de carbone

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5858201A (en) * 1994-07-29 1999-01-12 Toto, Ltd. Strong acid sterilizing liquid containing hypochlorous acid at a low concentration, method and apparatus for generating same, and apparatus for generating and dispensing same
WO2011142671A1 (fr) * 2010-05-14 2011-11-17 Watter Holding B.V. Dispositif de production d'une solution activée électrochimiquement grâce à un processus d'électrolyse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5858201A (en) * 1994-07-29 1999-01-12 Toto, Ltd. Strong acid sterilizing liquid containing hypochlorous acid at a low concentration, method and apparatus for generating same, and apparatus for generating and dispensing same
WO2011142671A1 (fr) * 2010-05-14 2011-11-17 Watter Holding B.V. Dispositif de production d'une solution activée électrochimiquement grâce à un processus d'électrolyse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3378968A1 (fr) * 2017-03-21 2018-09-26 Kabushiki Kaisha Toshiba Dispositif et procédé électrolytiques de dioxyde de carbone
CN108624905A (zh) * 2017-03-21 2018-10-09 株式会社东芝 二氧化碳电解装置以及二氧化碳电解方法
US10208385B2 (en) 2017-03-21 2019-02-19 Kabushiki Kaisha Toshiba Carbon dioxide electrolytic device and carbon dioxide electrolytic method

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