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A fuel cell system for degrading coking wastewater

A fuel cell system and fuel cell technology, which are applied in the fields of special compound water treatment, water pollutants, water/sewage treatment, etc., to achieve the effects of effective degradation, stable electricity production, and reduction of COD and ammonia nitrogen concentrations

Active Publication Date: 2021-09-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biological method is the most widely used wastewater treatment method to achieve the degradation of pollutants under the action of microorganisms, but there are still cases where coking wastewater cannot meet the standard and further advanced treatment is required

Method used

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  • A fuel cell system for degrading coking wastewater
  • A fuel cell system for degrading coking wastewater
  • A fuel cell system for degrading coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Photocatalytic coupled microbial fuel cell process for coking wastewater treatment

[0025] The COD concentration of the initial coking wastewater is about 2800mg / L, and the pH is about 9. Firstly, adjust the pH of the coking wastewater to the range of 4-5 with an acidic solution of appropriate concentration. Then it enters the primary microbial fuel cell reactor through a peristaltic pump. The hydraulic retention time is about 10 hours to 15 hours. The treated effluent of the primary microbial fuel cell is collected, and the collected primary effluent enters the secondary microbial fuel cell with the same structure under the action of the peristaltic pump, and the hydraulic retention time is still 10 hours to 15 hours. Collect secondary treatment effluent again. The treated effluent of the secondary microbial fuel cell is subjected to another degradation treatment of the tubular photocatalytic fuel cell, and the coking wastewater is further degraded under...

Embodiment 2

[0026] Embodiment two: the degradation effect of primary microbial fuel cell and secondary microbial fuel cell

[0027] During the 14 days of continuous operation of the secondary microbial fuel cell, the treated effluent of the primary microbial fuel cell and the secondary microbial fuel cell were sampled at the same time every day to ensure the consistency and reliability of the experiment.

[0028] figure 2 Adjust the pH of the original coking wastewater to 4-5, and then after the primary photocatalytic microbial fuel cell treatment, the change trend of COD concentration and the degradation rate of COD can be seen in the continuous operation of 14 days, the COD degradation rate of the effluent has been stable.

[0029] image 3 After the pH of the original coking wastewater is adjusted to 4-5, the COD concentration change trend and COD degradation rate after the secondary photocatalytic fuel cell treatment can be seen. Compared with the primary photocatalytic microbial f...

Embodiment 3

[0030] Example Three: Degradation Effects of Different Persulfate Concentrations in Photocatalytic Fuel Cells

[0031] After the coking wastewater is treated by the secondary microbial fuel cell, the effluent from the secondary microbial fuel cell is treated by the photocatalytic fuel cell again. In order to improve the degradation effect, different concentrations of persulfate were added, Figure 4 Under the condition of different concentrations of persulfate, the secondary effluent of the microbial fuel cell passes through the COD degradation of the photocatalytic fuel cell again. From Figure 4 It can be seen that when the persulfate concentration is 30mM, the degradation effect is relatively optimal, and the COD concentration can reach below 50mg / L.

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Abstract

The invention provides a fuel cell system for degrading coking wastewater, which belongs to the technical field of sewage treatment in environmental protection. The reaction system of the secondary microbial fuel cell is built, in which the structure of the primary microbial fuel cell and the secondary microbial fuel cell are the same. In order to improve the degradation effect, a stainless steel mesh coated with a photocatalytic material of a suitable size is placed in the cathode chamber of the microbial fuel cell. In order to further degrade the pollutants, the treated effluent of the secondary microbial fuel cell is then treated by the photocatalytic fuel cell. Under the action of photoelectric catalysis and persulfate, the effective degradation of coking wastewater is finally realized. Coking wastewater is treated by the system of secondary microbial fuel cell and photocatalytic fuel cell, and the concentration of COD and ammonia nitrogen is significantly reduced. This process realizes the effective degradation of complex, toxic and harmful coking wastewater. And in the effective degradation process of coking wastewater, the system can continue to produce electricity and the electricity production situation is stable.

Description

technical field [0001] The invention discloses a system for degrading coking wastewater, which belongs to the technical field of sewage treatment in environmental protection. It mainly involves the efficient degradation of coking wastewater in the combined system of coupled photocatalytic microbial fuel cells and photocatalytic fuel cells, providing a new idea for the treatment of coking wastewater. Background technique [0002] With the rapid development of my country's coke industry and the continuous increase of coal production, a large amount of coking wastewater will be generated in the process of high-temperature dry distillation, gas purification and chemical product refining of coal, which has a large discharge volume and complex water quality components. Coking wastewater is a very typical industrial wastewater with complex components, large chroma, and high concentration of pollutants. The water quality is complex and contains a variety of organic / inorganic polluta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/00C02F1/461C02F1/30C02F101/16
CPCC02F1/30C02F1/46109C02F3/005C02F3/34C02F2001/46133C02F2101/16C02F2305/10
Inventor 柳丽芬李姝琪
Owner DALIAN UNIV OF TECH