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Method for enhancing electrogenesis effect of microbial fuel cell taking sludge as fuel

A technology of fuel cells and microorganisms, applied in biochemical fuel cells, fuel cells, fuel cells, etc., can solve problems such as poor power generation effect, achieve the effects of reducing pollution, improving power generation effect, and reducing volume

Inactive Publication Date: 2013-01-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the pretreatment method does not effectively convert the sludge into a carbon source preferentially used by electrogenic microorganisms, the electricity generation effect is still poor.

Method used

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  • Method for enhancing electrogenesis effect of microbial fuel cell taking sludge as fuel
  • Method for enhancing electrogenesis effect of microbial fuel cell taking sludge as fuel
  • Method for enhancing electrogenesis effect of microbial fuel cell taking sludge as fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the air cathode single-chamber microbial fuel cell reactor with a volume of 150mL, adding the total COD concentration is 1000mg / L without any treatment of the original residual sludge as fuel, and the reaction temperature is 25 ± 1 ℃ (the present invention is used for Any conventional temperature, here only 25±1°C is taken as an example, and the following examples are the same). Connect the fuel cell to a 1000Ω external circuit and start running. After the voltage output gradually stabilizes, start to test the power generation effect. The highest voltage produced by the microbial fuel cell is 283mV, and the maximum power density is 432mW / m 2 .

Embodiment 2

[0028] Step 1: Sludge Pretreatment

[0029] The excess sludge with a total COD concentration of 1000mg / L was subjected to ultrasonic pretreatment, and the ultrasonic energy density was 1kW / L.

[0030] Step 2: Microbial fuel cell power generation

[0031] The operating steps of the air cathode single-chamber microbial fuel cell in Example 2 are as described in Example 1. The maximum voltage produced by the microbial fuel cell fueled by ultrasonically pretreated excess sludge is 425mV, and the maximum power density is 720mW / m 2 .

Embodiment 3

[0033] Step 1: Preparation of Sludge Fermentation Supernatant

[0034] The remaining sludge produced by the sewage treatment plant was fermented under the condition of pH 10 for 8 days to obtain a sludge fermentation mixture, and then the sludge fermentation mixture was centrifuged at 6000 rpm for 10 minutes to obtain a sludge fermentation supernatant.

[0035] Step 2: Microbial fuel cell power generation using sludge fermentation supernatant as fuel

[0036] The electricity generation operation steps of Example 3 were as described in Example 1, and the remaining sludge fermentation supernatant with a total COD concentration of 1000 mg / L was added to the air cathode single-chamber microbial fuel cell as fuel. The microbial fuel cell using sludge fermentation supernatant as fuel can produce a maximum voltage of 552mV and a maximum power density of 1121mW / m 2 , The power generation effect is significantly improved compared with Examples 1 and 2.

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Abstract

The invention relates to a method for enhancing the electrogenesis effect of a microbial fuel cell taking sludge as fuel, belonging to the technical field of environmental protection. The method comprises the following steps of: (1) fermenting excess sludge and primary sludge which are generated at a sewage treatment plant or a mixture of the excess sludge and the primary sludge under the condition of alkaline pH value of 9-10 for 6-8 days; (2) centrifugalizing a sludge fermentation mixture under the condition of 6,000 revolutions / minute for 10 minutes so as to obtain a sludge fermentation supernate; and (3) adding the sludge fermentation supernate to an air cathode single-chamber microbial fuel cell as a carbon source of a electrogenesis microbe for electrogenesis. The invention not onlyobviously enhances the electrogenesis effect of the microbial fuel cell taking the sludge as the fuel and realizes the high-efficiency resource utilization of the sludge, but also reduces the volume of the sludge and the pollution caused by the sludge on environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for improving the electricity production effect of a microbial fuel cell using sludge as fuel. Background technique [0002] With the rapid industrialization and urbanization of our country, the discharge of sewage is increasing. According to reports, by the end of September 2010, 2,630 sewage treatment plants had been built nationwide, with a daily sewage treatment capacity of 122 million cubic meters. Many sewage treatment plants have played an important role in solving the problem of water pollution in our country. However, a large amount of sludge is produced during the biological treatment of sewage. It is estimated that by the end of 2010, China's sludge production will reach 4 million tons (dry weight). Sludge usually contains a large amount of toxic and harmful substances such as organic pollutants, pathogenic bacteria, and heavy metals. If it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/16H01M8/06
CPCY02E70/20Y02E60/527Y02E60/50
Inventor 陈银广冯雷雨严媛媛
Owner TONGJI UNIV
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