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A microbial fuel cell in-situ coupled persulfate-like Fenton technology to enhance the removal of refractory organic matter

A technology for refractory organics and fuel cells, which is applied in chemical instruments and methods, biological water/sewage treatment, water pollutants, etc., to achieve the effect of improving the reuse rate, overcoming the difficulty of catalyst recovery, and strengthening mineralization removal.

Active Publication Date: 2020-10-16
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this technology is that the MFCs system cathode supports the composite catalyst MnFe 2 o 4 , and add persulfate to the cathode chamber to construct MFCs in-situ Fenton-like technology, improve the ability to mineralize and remove refractory organic matter; the electrons recovered in the anode chamber during the process of processing easily degradable organic matter are transferred to the cathode chamber, which promotes the cathodic catalyst The recovery and utilization of the catalyst improves the service life of the catalyst, reduces the cost, and overcomes the problems of cost increase and secondary pollution caused by continuously adding catalyst to the solution.

Method used

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  • A microbial fuel cell in-situ coupled persulfate-like Fenton technology to enhance the removal of refractory organic matter
  • A microbial fuel cell in-situ coupled persulfate-like Fenton technology to enhance the removal of refractory organic matter
  • A microbial fuel cell in-situ coupled persulfate-like Fenton technology to enhance the removal of refractory organic matter

Examples

Experimental program
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Effect test

Embodiment 1

[0016] (1) Synthesis of MnFe 2 o 4 Nanocrystal: Weigh 0.502g manganese nitrate (Mn(NO 3 ) 2 4H 2 O) and 1.616g iron nitrate (Fe(NO3 ) 3 9H 2 0), added to 25mL of deionized water, that is, the molar ratio of manganese and iron is 1:2, stirred vigorously until completely dissolved, added NaOH solution to adjust pH=13; the above solution was transferred to a 100mL autoclave, and nitrogen gas was introduced Blow for 10 minutes, then place the autoclave in a constant temperature box, control the temperature at 180°C, and react for 12 hours; after the reaction, take out the autoclave, cool to room temperature, collect the solid matter in the autoclave by centrifugation, wash with ultrapure water, centrifuge again, and repeat Wash several times until the pH of the solution is neutral after washing; put the washed solid matter into a drying oven and dry at 60°C for 12 hours to obtain MnFe 2 o 4 nanoparticles.

[0017] (2) Preparation of MnFe 2 o 4 Loaded cathode, the specifi...

Embodiment 2

[0021] (1) Synthesis of MnFe 2 o 4 Nanocrystal: Weigh 0.502g manganese nitrate (Mn(NO 3 ) 2 4H 2 O) and 1.616g iron nitrate (Fe(NO 3 ) 3 9H 2 0), added to 25mL of deionized water, that is, the molar ratio of manganese and iron is 1:2, stirred vigorously until completely dissolved, added NaOH solution to adjust pH=13; the above solution was transferred to a 100mL autoclave, and nitrogen gas was introduced Blow for 10 minutes, then place the autoclave in a constant temperature box, control the temperature at 180°C, and react for 12 hours; after the reaction, take out the autoclave, cool to room temperature, collect the solid matter in the autoclave by centrifugation, wash with ultrapure water, centrifuge again, and repeat Wash several times until the pH of the solution is neutral after washing; put the washed solid matter into a drying oven and dry at 60°C for 12 hours to obtain MnFe 2 o 4 nanoparticles.

[0022] (2) Preparation of MnFe 2 o 4 Loaded cathode, the speci...

Embodiment 3

[0026] (1) Synthesis of MnFe 2 o 4 Nanocrystal: Weigh 0.502g manganese nitrate (Mn(NO 3 ) 2 4H 2 O) and 1.616g iron nitrate (Fe(NO 3 ) 3 9H 2 0), added to 25mL of deionized water, that is, the molar ratio of manganese and iron is 1:2, stirred vigorously until completely dissolved, added NaOH solution to adjust pH=13; the above solution was transferred to a 100mL autoclave, and nitrogen gas was introduced Blow for 10 minutes, then place the autoclave in a constant temperature box, control the temperature at 180°C, and react for 12 hours; after the reaction, take out the autoclave, cool to room temperature, collect the solid matter in the autoclave by centrifugation, wash with ultrapure water, and centrifuge again, repeat Wash several times until the pH of the solution is neutral after washing; put the washed solid matter into a drying oven and dry at 60°C for 12 hours to obtain MnFe 2 o 4 nanoparticles.

[0027] (2) Preparation of MnFe 2 o 4 Loaded cathode, the speci...

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Abstract

The invention relates to a method for improving removal of refractory organic compounds through in-situ coupling of a microbial fuel cell and a persulfate Fenton technology, and belongs to the fieldsof sewage treatment and recycling. The method disclosed by the invention comprises the following steps: preparing a MnFe2O4 nanoparticle supported electrode, which is taken as a cathode of a double-chamber type microbial fuel cell, and adding electrolyte containing persulfate into the cathode chamber to establish the in-situ persulfate Fenton technology, thereby enhancing removal of the refractoryorganic compounds in the cathode chamber by virtue of a combination effect of a free radical SO4.<-> produced by persulfate and HO. produced by electrochemistry, and recovering electric energy. The method is simple and environmental-friendly, has a wide range of refractory organic compounds to be treated, solves the problems such as catalyst recovery difficulty, secondary pollution and the like caused by an operation of directly adding a catalyst into a solution, and is an environmental-friendly water treatment technology integrating degradation of pollutants and energy recovery.

Description

[0001] Technical field [0002] The invention provides a method for in-situ coupling of microbial fuel cells and persulfate-based Fenton technology to improve the ability to remove refractory organic matter, and belongs to the field of sewage treatment and resource utilization. Background technique [0003] Microbial fuel cells (MFCs) is a new sewage treatment technology that integrates pollutant removal and energy recovery. Traditional sewage treatment technologies often require additional energy input, while MFCs require little or no external energy. It can convert organic matter in domestic sewage or industrial wastewater into electrical energy, realize energy recovery and complete removal of pollutants. MFCs can remove organic pollutants through a variety of redox pathways. At present, the application of MFCs to treat high-concentration and easily degradable organic wastewater, such as brewery wastewater, lactic acid wastewater, slaughterhouse wastewater and food processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00C02F101/30
Inventor 全向春徐恒铎陈亮
Owner BEIJING NORMAL UNIVERSITY