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Self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system and application thereof

An electrocatalytic oxidation and fuel cell technology, applied in biochemical fuel cells, electrochemical biocombination treatment, water pollutants, etc., can solve the problems of large chromaticity, long startup time, and low catalytic efficiency.

Inactive Publication Date: 2020-07-14
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The characteristics of dye wastewater are: (1) The concentration of COD is high, while the value of BOD / COD is small, and the biodegradability is poor
The dyes lost in the dye production process lead to a high COD concentration in the water. Due to the complexity of the type and structure of the dye itself, its biodegradability is very low, and it is difficult to treat with conventional biological treatment technologies.
(2) Large chroma and complex components
However, there are still some major problems in engineering application of electrocatalytic oxidation technology: 1) low catalytic efficiency; 2) poor mass transfer effect; 3) high energy consumption
Despite such outstanding advantages, the characteristics of dye wastewater make the MFC system still face the characteristics of microbial domestication, long start-up time, and poor treatment effect when treating it.

Method used

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  • Self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system and application thereof
  • Self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The dye wastewater used in this example is wastewater containing methyl orange, the concentration of methyl orange is 1100 mg / L, and the COD is 540 mg / L.

[0059] The anode of the electrocatalytic oxidation degradation module includes: a titanium substrate casing, an Ir / Ru oxide layer deposited on the titanium substrate casing, a magnetic substance attached to the Ir / Ru oxide layer, the The magnetic substance is a magnetic particle wrapped by a functional layer, and the material of the functional layer is Sb-SnO 2 , the magnetic particles are Fe 3 o 4 , the interior of the titanium matrix casing is filled with magnets; the cathode is a titanium mesh cathode, and is performed in a two-electrode system without a diaphragm. When the treatment voltage used is 4V, the hydraulic retention time is 12h, the decolorization rate of dye wastewater is 100%, and the COD removal rate is 12.5%. The resulting wastewater enters the subsequent microbial fuel cell stack modules.

[00...

Embodiment 2

[0064] The wastewater used in this example is wastewater containing acid red G, the concentration of acid red G is 100 mg / L, and the COD concentration of wastewater is 27.8 mg / L.

[0065] The anode of the electrocatalytic oxidation degradation module includes: a titanium substrate casing, a lead dioxide layer deposited on the titanium substrate casing, and a magnetic substance attached to the lead dioxide layer, the magnetic substance being coated with Pb 3 o 4 wrapped Fe 3 o 4 Particles are filled with magnets inside the titanium matrix casing, and the cathode is a copper sheet; it is carried out in a two-electrode system without a diaphragm. The treatment current density used was 5.0mA / cm 2 (The corresponding treatment voltage is 4.7V), the hydraulic retention time is 2h, the decolorization rate of dye wastewater is 87.8%, and the COD removal rate of wastewater is 8.19%. The resulting wastewater enters the subsequent microbial fuel cell stack modules.

[0066] The MFC s...

Embodiment 3

[0070] The wastewater used in this example is wastewater containing aniline yellow, the concentration of aniline yellow is 105 mg / L, and the COD concentration of wastewater is 420 mg / L.

[0071] The electrocatalytic oxidation degradation module uses a graphite anode and a stainless steel cathode. No external magnetic particles are used on the surface of the anode, and it is carried out in a two-electrode system without a diaphragm. When the treatment voltage used is 2.0V, the hydraulic retention time is 12h, the decolorization rate of dye wastewater is 86.1%, and the COD removal rate of wastewater is 20.8%. The resulting wastewater enters the subsequent microbial fuel cell stack modules.

[0072] The MFC startup process is divided into three stages as in Embodiment 1. After the third stage, the system enters the stable operation stage, and the output voltage is finally stabilized at 0.55±0.05mV, indicating that the electrogenic microorganisms have adapted to the characteristi...

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Abstract

The invention provides a self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system and application thereof, and relates to the field of electrochemical water treatment. Accordingto the self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system provided by the invention, the electrocatalytic oxidation degradation module can improve the biodegradability of wastewater, that is, structural damage (decolorization process completion) and toxicity reduction of macromolecular organic matters in the wastewater are completed, and subsequent treatment of a microbial fuel cell stack module is facilitated. The microbial fuel cell stack module can remove COD in the wastewater, so that the wastewater is discharged after reaching the standard. In addition, the microbial fuel cell stack module can stably generate electricity, and supplies power to the electro-catalytic oxidation degradation module through the electric energy storage-adjustment module, so that self-sustaining is achieved. The coupling system provided by the invention can well remove the color and COD of the dye wastewater.

Description

technical field [0001] The invention relates to the field of electrochemical water treatment, in particular to a self-sustaining electrocatalytic oxidation-microbial fuel cell coupling system and its application. Background technique [0002] At present, printing and dyeing and related industries have become the largest dischargers of industrial wastewater in my country. According to statistics, the wastewater discharge of national printing and dyeing and related industries is about 3×10 6 ~4×10 6 m 3 / d. Due to the high COD value, large chroma and high salt content of dye wastewater, it has the characteristics of high toxicity, carcinogenicity and difficulty in biodegradation, making it a difficult point for industrial wastewater treatment. According to the chemical structure classification (mainly according to the structure of the conjugated system contained in the dye), it can be divided into: azo, phthalocyanine, anthraquinone, cyanine, indigo, aromatic methane, nitr...

Claims

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Application Information

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IPC IPC(8): C02F9/14H01M8/16C02F101/30
CPCC02F1/4672C02F3/005C02F2101/308H01M8/16Y02E60/50
Inventor 徐浩郭华许志成陈诗雨李珊珊唐卫华
Owner XI AN JIAOTONG UNIV