Staggered electrode bio-electro-Fenton groundwater circulation well system, and electro-Fenton assembly

Patent metadata

Field	Value
Publication number	US-12084367-B2
Application number	US-202218028575-A
Country	US
Kind code	B2
Filing date	Sep 21, 2022
Priority date	Jan 11, 2022
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

The disclosure relates to a staggered electrode bio-electro-Fenton groundwater circulation well system, including a groundwater circulation well, a water pumping and injecting assembly and an in-well bio-electro-Fenton assembly. The water pumping and injecting assembly is configured to realize water pumping and injection between different screening sections of the groundwater circulation well. The bio-electro-Fenton assembly arranged in a first screening section of the groundwater circulation well includes at least one electrode device. A cathode and an anode of the electrode device form a spatially staggered arrangement according to different distribution areas. According to the disclosure, the spatially staggered arrangement of the cathode and the anode, the influence of oxygen on an anaerobic environment of an anode chamber in the electrode device is greatly reduced while ensuring the cathode takes oxygen as an electron acceptor, and the constructed bio-electro-Fenton system can accelerate the decomposition of organic pollutants in the groundwater circulation well.

First claim

What is claimed is:

1. A staggered electrode bio-electro-Fenton groundwater circulation well system, at least comprising a groundwater circulation well, a water pumping and injecting assembly and an in-well bio-electro-Fenton assembly, wherein the water pumping and injecting assembly is configured to realize water pumping and injection between different screening sections of the groundwater circulation well;
the bio-electro-Fenton assembly arranged in a first screening section ( 21 ) of the groundwater circulation well comprises at least a plurality of staggered electrode devices; and
a cathode ( 12 ) and an anode ( 11 ) of each electrode device form a spatially staggered arrangement according to different distribution areas;
the cathode ( 12 ) of each electrode device is arranged outside thea chamber coated with a proton exchange membrane ( 8 );
the anode ( 11 ) is arranged inside the chamber coated with the proton exchange membrane ( 8 ); and
the cathode ( 12 ) is arranged on top of the anode ( 11 ); and
the cathode ( 12 ) and the anode ( 11 ) are staggered in an axial direction of each electrode device;
at least one chamber coated with the proton exchange membrane ( 8 ) is arranged in each electrode device to form an anode chamber ( 6 ) for injecting anode liquid therein;
a first part, belonging to an anode section, of the anode chamber ( 6 ) is filled with conductive carrier particles loaded with electroactive microorganisms to form the anode ( 11 );
an outer surface of a second part, belonging to a cathode section, of the anode chamber ( 6 ) is coated with an iron-modified carbon felt electrode to form the cathode ( 12 );
such that the anode ( 11 ) and the cathode ( 12 ) are staggered inside and outside the anode chamber ( 6 );
the anode liquid is organic waste water that has been deoxidized by a deoxidation system, so that the electroactive microorganisms ( 23 ) loaded on surfaces of the conductive carrier particles filled at the anode section inside the anode chamber ( 6 ) are arranged to grow in an anaerobic environment;
when electrified, the electroactive microorganisms ( 23 ) loaded on surfaces of the conductive carrier particles in the anode ( 11 ) are configured to decompose an organic carbon source in the anode liquid to produce protons and electrons; and
the cathode ( 12 ) is configured to take oxygen as an electron acceptor to be bound with protons transferred from the anode to produce H 2 O 2 , and take Fe 3+ as an electron acceptor to produce Fe 2+ , so that a Fenton-like reaction occurs on a surface of the cathode and organic pollutants in the cathode liquid are decomposed, thereby purifying the anode liquid injected into the chamber in the electrode device and the cathode liquid in the groundwater circulation well at a same time;
wherein the anode liquid is organic waste water, and the cathode liquid is organic pollutant-polluted groundwater;
the chamber is formed of a pipe ( 13 ) coated with the proton exchange membrane ( 8 ), a pipe wall of the pipe ( 13 ) is provided with a plurality of holes penetrating the pipe wall;
the groundwater circulation well system further comprises an aeration system, wherein an aeration head ( 14 ) of the aeration system is arranged at a junction of the anode ( 11 ) and the cathode ( 12 ), and the aeration head ( 14 ) is arranged to perform aeration towards a position where the cathode ( 12 ) is located, so that the influence of oxygen on the anaerobic environment of the anode chamber is reduced.

2. The staggered electrode bio-electro-Fenton groundwater circulation well system according to claim 1 , wherein the plurality of electrode devices are provided and arranged in parallel; an electrode group formed by the plurality of electrode devices arranged in parallel is capable of being arranged in the cathode liquid in any posture.

3. The staggered electrode bio-electro-Fenton groundwater circulation well system according to claim 1 , wherein the plurality of electrode devices are provided and arranged vertically in parallel, and the cathode ( 12 ) is located at the top end of the anode ( 11 ).

4. The staggered electrode bio-electro-Fenton groundwater circulation well system according to claim 1 , wherein the anode chamber ( 6 ) in each electrode device is formed of a pipe ( 13 ) coated with the proton exchange membrane ( 8 ), a pipe wall of the pipe ( 13 ) is provided with a plurality of holes penetrating the pipe wall.

5. A bio-electro-Fenton assembly for purifying anode liquid and cathode liquid simultaneously, applied in the staggered electrode bio-electro-Fenton groundwater circulation well system according to claim 1 , wherein the bio-electro-Fenton assembly comprises at least a plurality of staggered electrode devices,
at least one chamber coated with the proton exchange membrane ( 8 ) is arranged in each electrode device to form an anode chamber ( 6 ) for injecting anode liquid therein;
a first part, belonging to an anode section, of the anode chamber ( 6 ) is filled with conductive carrier particles loaded with electroactive microorganisms to form an anode ( 11 );
an outer surface of a second part, belonging to a cathode section, of the anode chamber ( 6 ) is coated with an iron-modified carbon felt electrode to form a cathode ( 12 );
such that the anode ( 11 ) and the cathode ( 12 ) are staggered inside and outside the anode chamber ( 6 ), and
the spatial distribution areas of the cathode ( 12 ) and the anode ( 11 ) of each electrode device form a staggered arrangement.

Assignees

• Univ Chengdu Technology

Inventors

• Pu Shengyan
• Ma Hui
• Yu Dong
• Liu Shibin
• Wang Peng
• Li Bowen
• Wang Xin
• Chen M
• Zhang Tao
• Chen Jinsong
• Tang Qiang

Classifications

• C02F2203/006

  details of construction, e.g. specially adapted seals, modules, connections · CPC title

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title

• C02F2103/06

  Contaminated groundwater or leachate · CPC title

• C02F3/2866 Primary

  Particular arrangements for anaerobic reactors · CPC title

• C02F3/2806

  Anaerobic processes using solid supports for microorganisms · CPC title