Device for decomplexation and enhanced removal of copper based on self-induced fenton-like reaction constructed by electrochemistry coupled with membrane separation, and use thereof

Patent metadata

Field	Value
Publication number	US-11739009-B2
Application number	US-202016934054-A
Country	US
Kind code	B2
Filing date	Jul 21, 2020
Priority date	Dec 25, 2019
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A device for decomplexation and enhanced removal of copper based on self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation is disclosed. The device includes a reactor, two electrocatalytic anodes capable of generating hydroxyl radicals, an electrocatalytic cathode membrane assembly, a direct current power supply, an aeration system, an inlet pipe and an outlet pipe. The device of the present invention has a simple construction. Using this device to treat industrial wastewater containing copper complexes under specific conditions allows the decomplexation and the removal of the industrial wastewater containing the copper complexes to be simultaneously realized at a low consumption and a high efficiency. The coupling of electrochemistry with membrane separation can be achieved to protect the cathode from being contaminated by pollutants in the sewage and prolong the service life of the electrode.

First claim

What is claimed is:

1. A device for decomplexation and enhanced removal of copper based on a self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation, comprising a reactor, two electrocatalytic anodes, an electrocatalytic cathode membrane assembly, a direct current power supply, an aeration system, an inlet pipe, and a first outlet pipe; wherein
the two electrocatalytic anodes generate hydroxyl radicals, wherein each of the two electrocatalytic anodes is one selected from the group consisting of an activated carbon fiber felt and a metal oxide active electrode,
the two electrocatalytic anodes and the electrocatalytic cathode membrane assembly are both located in the reactor,
the two electrocatalytic anodes are connected to a positive pole of the direct current power supply via a first wire, and
the electrocatalytic cathode membrane assembly is located between the two electrocatalytic anodes, wherein
the electrocatalytic cathode membrane assembly comprises a membrane bracket, a composite conductive microfiltration membrane and a second outlet pipe, wherein the composite conductive microfiltration membrane is prepared by placing a titanium wire mesh on a non-woven fabric, and knife coating a casting solution on the titanium wire mesh for a phase inversion, the composite conductive microfiltration membrane is embedded with the titanium wire mesh, and the composite conductive microfiltration membrane has a membrane pore size of 0.1-0.4 μm,
the composite conductive microfiltration membrane is attached on both sides of the membrane bracket,
the composite conductive microfiltration membrane is connected to a negative pole of the direct current power supply via a second wire, and
the membrane bracket has an inner cavity in communication with the second outlet pipe through a suction port provided on the membrane bracket, wherein
the aeration system comprises an aeration tube, a flow meter, and an air pump,
the aeration tube is located below the electrocatalytic cathode membrane assembly, and the flow meter is configured to regulate a flow rate of intake air, wherein
the inlet pipe is in communication with a water inlet provided in an upper portion of the reactor, and a water inlet pump is provided on the inlet pipe, and wherein
the first outlet pipe is in communication with a water outlet of the second outlet pipe, and a water outlet pump is provided on the first outlet pipe.

2. A method of using the device according to claim 1 in a treatment of industrial wastewater containing copper complexes, wherein the industrial wastewater contains copper ions with a concentration of 1-32 mg/L and the copper complexes with a concentration of 0-0.5 mM at a pH of 3-7, and the method comprises the following steps:
(1) allowing the industrial wastewater to enter the reactor through the inlet pipe and the water inlet under an action of the water inlet pump;
(2) turning on the air pump, and adjusting the flow meter to aerate air into the reactor through the aeration tube;
(3) switching on the direct current power supply for an electrolysis at a voltage controlled to 1.5-4 V for a time period of 1.5-2.5 hours; and
(4) turning on the water outlet pump to withdraw the industrial wastewater in the reactor through the electrocatalytic cathode membrane assembly.

3. The method according to claim 2 , wherein in step (2), the aeration tube has an aeration flow rate of 0.3 L/min.

Assignees

• Univ Tongji
• Univ Tianjin Polytechnic

Inventors

• Wang Zhiwei
• Zhang Hongwei
• Wang Liang
• Li Jiayi
• Wang Xueye
• Chen Mei
• Dai Ruobin

Classifications

• B01D61/425 Primary

  Electro-ultrafiltration · CPC title

• B01D2325/02834

  more than 0.1 and up to 1 µm · CPC title

• C02F1/4672 Primary

  by electrooxydation · CPC title

• B01D61/147

  Microfiltration · CPC title

• B01D67/0013

  Casting processes · CPC title