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A method for electro-fenton combined biocatalytic degradation of high molecular weight pam in aqueous solution

A catalytic degradation, high molecular weight technology, applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc., can solve the problems of difficult utilization of carbon backbone and difficulty in functioning of intracellular metabolic enzymes, and achieve improvement Biodegradation performance, enhancement of biodegradation efficiency, effect of reducing energy consumption

Active Publication Date: 2019-04-05
合肥庐阳科技创新集团有限公司
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AI Technical Summary

Problems solved by technology

Although microorganisms can use extracellular amidase to hydrolyze the side chain amide group of PAM into ammonia and use it as a nitrogen source, its carbon backbone is difficult to use as a carbon source, because PAM with a long chain structure is not easy to enter through the cell membrane Inside the cell, making it difficult for intracellular metabolic enzymes to function

Method used

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  • A method for electro-fenton combined biocatalytic degradation of high molecular weight pam in aqueous solution

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Embodiment approach

[0023] The anode electrode used in this example is a bioelectrode, which is domesticated in a single-chamber air cathode fuel cell, and the specific domestication process is as follows:

[0024] With 3×7.5cm 2 The carbon felt is used as the anode, and the platinum-loaded carbon paper is used as the cathode, with a concentration of 0.2mol L -1 , pH is 7 phosphate solution as the buffer solution, the PAM degradation solution degraded by the heterogeneous electro-Fenton method is used as the substrate, and the activated sludge with a solid content of 1% is used as the inoculation sludge, 30 ° C constant temperature domestication for 180 days, A functional biofilm is obtained on the anode carbon felt, which is a bioelectrode.

Embodiment 1

[0026] 1. Use the double-chamber electrolytic cell as the reactor to load nano-Fe 3 o 4 The carbon felt is the cathode, and the cathode electrode area is 3×4cm 2 , Fe 3 o 4 The loading capacity is 15wt%; the bioelectrode is used as the anode, and the anode electrode area is 3×7.5cm 2 . The cathode electrode and the anode electrode are respectively inserted into the cathode chamber and the anode chamber of the reactor and connected to the DC power supply through wires, and the cathode chamber and the anode chamber are separated by a proton exchange membrane;

[0027] 2. The electrolyte in the cathode chamber is high molecular weight PAM and Na 2 SO 4 neutral solution, at 30mL·s -1 The flow rate is continuously blown into the air from the bottom, and an electric Fenton catalytic degradation reaction occurs on the surface of the cathode electrode by applying a 2V external voltage through a DC power supply; the concentration of high molecular weight PAM in the electrolyte i...

Embodiment 2

[0030] 1. Use the double-chamber electrolytic cell as the reactor to load nano-Fe3 o 4 The carbon felt is the cathode, and the cathode electrode area is 3×4cm 2 , Fe 3 o 4 The loading capacity is 35wt%; the bioelectrode is used as the anode, and the anode electrode area is 3×7.5cm 2 . The cathode electrode and the anode electrode are respectively inserted into the cathode chamber and the anode chamber of the reactor and connected to the DC power supply through wires, and the cathode chamber and the anode chamber are separated by a proton exchange membrane;

[0031] 2. The electrolyte in the cathode chamber is high molecular weight PAM and Na 2 SO 4 neutral solution, at 30mL·s -1 The flow rate is continuously blown into the air from the bottom, and an electric Fenton catalytic degradation reaction occurs on the surface of the cathode electrode by applying a 2V external voltage through a DC power supply; the concentration of high molecular weight PAM in the electrolyte in ...

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Abstract

The invention discloses an electro-Fenton and biological catalytic degradation method for high-molecular-weight PAM (polyacrylamide) in an aqueous solution. According to the method, a two-chamber electrolytic cell is taken as a reactor, nano-Fe3O4 supported carbon felt is taken as a cathode, a bioelectrode is taken as an anode, the cathode and the anode are inserted into a cathode chamber and an anode chamber of the reactor and connected with a direct-current power source through wires, and the cathode chamber and the anode chamber are isolated through a proton exchange membrane, wherein a cathode chamber electrolyte is a neutral solution containing high-molecular-weight PAM with certain concentration and Na2SO4, air is blown in continuously from the bottom, and an electro-Fenton catalytic reaction is performed on the electrode surface; an anode chamber solution is a PAM degradation solution from the cathode chamber after electro-Fenton processing, and a bioelectrocatalytic reaction is performed on the electrode surface. After system processing, high-molecular-weight PAM can be degraded, and the COD (chemical oxygen demand) removal rate of the aqueous solution reaches 75%.

Description

1. Technical field [0001] The invention relates to a method for degrading PAM in waste water, in particular to a method for degrading high-molecular-weight PAM in aqueous solution with electro-Fenton combined with biocatalysis. 2. Background technology [0002] Polyacrylamide (PAM) is widely used in petroleum exploration, agriculture, papermaking, water treatment, textile, ore dressing and other fields, and the potential hazards of PAM residue, migration, transformation and degradation products in the environment are becoming more and more serious. For PAM in wastewater, the more effective method is to carry out degradation treatment to completely solve its pollution problem. Research on efficient, clean and economical PAM degradation technology and process has positive social and environmental benefits. [0003] PAM can be broken by thermal degradation, photodegradation or ultrasonic degradation, and it can also be degraded into small molecular substances by using oxidants ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/467C02F1/72H01M8/16C02F101/38
CPCC02F1/4672C02F1/725C02F2101/38C02F2201/46C02F2305/026H01M8/16Y02E60/50
Inventor 孙敏汪军翟林峰王华林
Owner 合肥庐阳科技创新集团有限公司
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