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Method of synchronously generating electricity and methane by using excess sludge by microbial fuel cell

A fuel cell and excess sludge technology, applied in biochemical fuel cells, biological sludge treatment, waste fuel, etc., can solve the problems of low efficiency, achieve strong social benefits, reduce volume, and improve utilization efficiency

Active Publication Date: 2014-10-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to overcome the shortcomings of traditional sludge anaerobic digestion, such as the high content of residual organic matter and the low efficiency of microbial fuel cells in utilizing sludge to generate electricity. The synergistic effect of methane microorganisms to synchronously produce electricity and methane, improve the efficiency of sludge electricity production and the conversion rate of sludge organic matter, thereby improving the efficiency of sludge recycling and sludge reduction

Method used

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  • Method of synchronously generating electricity and methane by using excess sludge by microbial fuel cell
  • Method of synchronously generating electricity and methane by using excess sludge by microbial fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A two-chamber microbial fuel cell is used. The volume of the two chambers is 500ml. The two chambers are separated by a proton exchange membrane. Both the positive and negative electrodes are made of carbon felt, and the cathode is plated with 0.25-0.5g / cm 2platinum. After sedimentation and concentration, the remaining sludge taken from the sewage treatment plant was adjusted to a concentration of 15g / L, and then it was mixed with the anaerobic sludge (concentration 15g / L) taken from the sludge anaerobic digestion tank by 10: 1 Mix, adjust the pH value of the mixed sludge to 7.0±0.1, and add 1mmol / L Fe 2+ (add FeCl 2 ), 100nmol / LNi 2+ (plus NiCl 2 ), 50nmol / L Co 2+ (plus CoCl 2 ), and add 10 μmol / L metal ion chelating agent nitrilotriacetic acid. After the mixed sludge is prepared, it is added to the anode chamber of the microbial fuel cell, and the concentrated sludge with a concentration of 10 g / L is added to the cathode chamber. The anode chamber was filled wi...

Embodiment 2

[0030] A single-chamber microbial fuel cell is used, the volume of the anode chamber is 500ml, and the anode uses carbon brushes. After the excess sludge from the sewage treatment plant was adjusted to 25g / L, it was heat treated at 121°C for 30min. Mix the pretreated residual sludge concentration with anaerobic sludge (concentration 10g / L) at a ratio of 2:1, adjust the pH value of the mixed sludge to 7.2±0.1, and add 1mmol / L Fe 2+ , 100nmol / L Ni 2+ 、50nmol / L Co 2+ , and add 10 μmol / L metal ion chelating agent nitrilotriacetic acid. The mixed sludge is then added to the anode chamber of the single-chamber microbial fuel cell. The anode chamber was filled with nitrogen and evacuated for 5 minutes and then sealed, and the two electrodes were connected with 1000Ω resistors. Afterwards, the microbial fuel cell was placed in a constant temperature environment of 37° C., and the anode chamber was stirred and mixed with a magnetic stirrer. Use a pH meter to control the pH value o...

Embodiment 3

[0033] The same dual-chamber microbial fuel cell as in Example 1 was used. After sedimentation and concentration, the remaining sludge from the sewage treatment plant is adjusted to 50g / L, and then it is mixed with the anaerobic sludge from the sludge tank at a ratio of 6:1 to adjust the mixed sludge. pH value to 6.8±0.1, and add 1mmol / L Fe 2+ (add FeCl 2 ), 100nmol / L Ni 2+ (plus NiCl 2 ), 50nmol / L Co 2+ (plus CoCl 2 ), and add 10 μmol / L metal ion chelating agent nitrilotriacetic acid. After the mixed sludge is prepared, it is added to the anode chamber of the microbial fuel cell, and the aerobic sludge with a concentration of 10 g / L is added to the cathode chamber. The anode chamber was filled with nitrogen and evacuated for 5 minutes and then sealed, and the two electrodes were connected with 500Ω resistors. Afterwards, the microbial fuel cell was placed in a constant temperature environment of 30° C., the anode chamber was stirred and mixed with a magnetic stirrer, a...

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Abstract

The invention relates to a sludge treatment method and process of synchronously generating electricity and methane by using excess sludge by a microbial fuel cell. The process mainly comprises anaerobic digestion of sludge and microbial electrogenesis. The operating method comprises the following steps: first, concentrating the excess sludge; mixing with anaerobic digested sludge; adjusting the pH value to an appropriate value; then, adding into an anode chamber of the microbial fuel cell; and controlling mixing and temperature of the mixed sludge in the anode chamber for anaerobic digestion and electrogenesis. The method provided by the invention is simple in process, simple and convenient to operate and control and low in operating cost and energy consumption and can generate electricity and methane by sludge. The output voltage of sludge electrogenesis is improved by 0.02-0.10V compared with that under the condition of just electrogenesis, the electrogenesis power is improved by 10-20%, and the methanogenesis is not affected and even improved by 5-10%. The residual organic matters in sludge after treatment can be reduced by 20-30% compared with those after conventional anaerobic digestion. Therefore, the sludge resource utilization and reduction efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a sludge treatment method and process for synchronous electricity and methane production by microbial fuel cells. Background technique [0002] Residual sludge is a by-product of sewage biological treatment and is an important organic waste that needs further treatment. A large amount of sludge will be produced during the biological treatment of sewage. It is estimated that the sludge yield in sewage treatment plants can reach 0.52-1.22kg SS / kg BOD5. In recent years, my country's economy and people's lives have maintained rapid growth. With the acceleration of urbanization and industrialization in our country, the amount of urban sewage treatment has also increased significantly, and the excess sludge produced after sewage treatment has also increased significantly. , the disposal of these excess sludge has become a difficult problem for relevant government departments. ...

Claims

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Application Information

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IPC IPC(8): C02F11/04H01M8/16
CPCY02E50/30Y02E60/50Y02W10/20
Inventor 肖本益刘俊新陈霞
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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