Method of membrane-coupled electrochemical advanced oxidation and its application device for water purification and water purification system using of the same

Patent metadata

Field	Value
Publication number	US-2020055751-A1
Application number	US-201716461098-A
Country	US
Kind code	A1
Filing date	Nov 16, 2017
Priority date	Nov 16, 2016
Publication date	Feb 20, 2020
Grant date	—

Abstract

The present invention relates to an electrochemical advanced oxidation process combined with a membrane in which electrode reactions and membrane filtration occur simultaneously, a water treatment device based on the electrochemical advanced oxidation process, and a water treatment system using the water treatment device. The electrochemical advanced oxidation process includes: providing a membrane electro-oxidation tank where electrodes are combined with a membrane; accommodating wastewater containing pollutants in the membrane electro-oxidation tank; and supplying power to the electrodes to decompose the pollutants and simultaneously separating particles through the membrane (water treatment). The electrodes are arranged downstream of the membrane. Gases released from the electrodes induce a vertical flow of the fluid to improve the contact efficiency between a reactive solution and the electrodes and remove the pollutants attached to the surface of the membrane. According to the present invention, a mechanism of decomposing pollutants using the electrodes and a mechanism of separating particles through the membrane take place simultaneously, enabling effective removal of the pollutants. The electrodes are arranged downstream of the membrane. With this arrangement, gases are produced from the electrodes to improve the electrolysis reactivity and the filtration efficiency of the membrane.

First claim

1 . An electrochemical advanced oxidation process combined with a membrane, comprising: providing a membrane electro-oxidation tank where electrodes are combined with a membrane; accommodating wastewater containing pollutants in the membrane electro-oxidation tank; and supplying power to the electrodes to decompose the pollutants and simultaneously separating particles through the membrane (water treatment), wherein the electrodes are arranged downstream of the membrane and gases released from the electrodes induce a vertical flow of the fluid to improve the contact efficiency between a reactive solution and the electrodes and remove the pollutants attached to the surface of the membrane.

2 . The electrochemical advanced oxidation process according to claim 1 , further comprising circulating the reactive solution added to the pollutants in the treatment tank during or before and/or after the water treatment.

3 . The electrochemical advanced oxidation process according to claim 1 , further comprising spraying the reactive solution or air into the treatment tank.

4 . The electrochemical advanced oxidation process according to claim 3 , wherein nozzles are disposed downstream of the electrodes and a blower for rapid supply of the fluid is connected to the nozzles to spray the reactive solution or air through the nozzles.

5 . An electrochemical advanced oxidation device combined with a membrane, comprising: a membrane filtration unit 400 provided in a treatment tank 100 in which wastewater containing pollutants is accommodated and through which the pollutants pass and are filtered; an electrolysis unit 200 provided in the treatment tank 100 and supplying power to decompose the pollutants based on oxidation and reduction; and a frame 300 interposed between the upstream membrane filtration unit 400 and the downstream electrolysis unit 200 such that the membrane filtration unit 400 and the electrolysis unit 200 are fixedly spaced a predetermined distance from each other, wherein when the electrolysis unit 200 is driven, gases released by the electrolysis induce a vertical flow of the fluid to remove the pollutants attached to the surface of the membrane.

6 . The electrochemical advanced oxidation device according to claim 5 , wherein the membrane filtration unit 400 is a submerged module in the form of a flat sheet, hollow fiber or tube.

7 . The electrochemical advanced oxidation device according to claim 5 , wherein the membrane filtration unit 400 comprises a ceramic or metal-based inorganic membrane and a Teflon-based chemical resistant organic membrane.

8 . The electrochemical advanced oxidation device according to claim 5 , wherein the electrolysis unit 200 comprises a power supply, an anode, and a cathode, and the anode is composed of titanium (Ti), iridium (Ir), ruthenium (Ru), stannum (Sn), tantalum (Ta), bismuth (Bi), carbon (C), boron (B), iron (Fe), aluminum (Al) or a mixture thereof.

9 . The electrochemical advanced oxidation device according to claim 5 , wherein the electrolysis unit 200 comprises a power supply, an anode, and a cathode, and the cathode is composed of titanium (Ti), iridium (Ir), ruthenium (Ru), stannum (Sn), tantalum (Ta), bismuth (Bi), carbon (C), boron (B), iron (Fe), aluminum (Al), stainless steel or a mixture thereof.

10 . A water treatment system comprising: a treatment tank 100 in which wastewater containing pollutants is accommodated; a membrane filtration unit 400 provided in the treatment tank 100 and through which the pollutants pass and the pollutant particles are filtered; and an electrolysis unit 200 provided in the treatment tank 100 and supplying power to decompose the pollutants based on oxidation and reduction, wherein the electrolysis unit 200 is located downstream of the filtration unit 400 such that gases released by the electrolysis induce a vertical flow of the fluid.

11 . The water treatment system according to claim 10 , further comprising a reactive solution circulating unit 800 adapted to suck the pollutants from the treatment tank 100 and resupplying the sucked pollutants to the treatment tank 100 to stir a reactive electrolyte solution.

12 . The water treatment system according to claim 10 , further comprising an air circulating unit 700 adapted to spray the fluid into the treatment tank 100 .

13 . The water treatment system according to claim 12 , wherein the air circulating unit 700 comprises a blower 720 adapted to forcibly circulate a flow of the fluid and nozzles 740 adapted to uniformly spray the fluid supplied through the blower 720 wherein the nozzles 740 are located downstream of the membrane filtration unit 400 or the electrolysis unit 200 .

14 . A water treatment system comprising a treatment tank 100 in which wastewater containing pollutants is accommodated and the electrochemical advanced oxidation device according to claim 5 provided in the treatment tank 100 wherein the electrochemical advanced oxidation device is provided in plurality.

Assignees

• Kyungpook Nat Univ Ind Academic Coop Found

Inventors

• Choo Kwang Ho

Classifications

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• C02F2301/08

  Multistage treatments, e.g. repetition of the same process step under different conditions · CPC title

• C02F2201/4619

  Supplying gas to the electrolyte · CPC title

• C02F2201/4618

  Supplying or removing reactants or electrolyte · CPC title

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title