Method for realizing methanogenesis with surplus sludge by utilizing microbial electrolytic tank

A technology of microbial electrolysis cell and excess sludge, which is applied in biological sludge treatment, waste fuel and other directions, can solve the problems of inability to fully utilize excess sludge and long time, and achieve the effect of short reaction time and reduction of environmental pollution.

Active Publication Date: 2012-10-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional fermentation method cannot fully utilize the excess sludge and takes a long time, and to provide a method for producing methane from the excess sludge by using a microbial electrolytic cell

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  • Method for realizing methanogenesis with surplus sludge by utilizing microbial electrolytic tank

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specific Embodiment approach 1

[0017] Embodiment 1: In this embodiment, the method for utilizing microbial electrolytic cells to realize methane production from excess sludge is realized in the following steps:

[0018] 1. Use excess sludge as a substrate to domesticate anode functional microorganisms and start the microbial electrolytic cell reactor: use a DC power supply as a power source to apply a voltage of 0.4 to 0.8V at both ends of the electrolytic cell, and mix the excess sludge with nutrient solution A to obtain The mixed solution B with a concentration of 9-24g / L is then added to the electrolytic cell, and the new mixed solution B is replaced under the condition that the voltage across the resistance of the closed circuit is lower than half of the initial voltage, and the new mixed solution B is continuously replaced. The anode functional microorganisms are domesticated and enriched until the resistance voltage is continuously stable, and the microbial electrolytic cell reactor can be started;

...

specific Embodiment approach 2

[0029] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, a DC power supply is used as the power source to apply a voltage of 0.6V to both ends of the electrolytic cell. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, a voltage of 0.6 V is applied to both ends of the electrolytic cell by using a DC power supply as the power source. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for realizing methanogenesis with surplus sludge by utilizing a microbial electrolytic tank, relates to a method for methanogenesis, and aims at solving the problems that a conventional fermentation method cannot completely utilize surplus sludge and is longer in time. The method comprises the following steps: firstly, taking surplus sludge as a substrate for acclimatization of anode functional microorganism and starting a microbial electrolytic tank reactor; and secondly, under the condition that the electrolytic tank is stable, taking the surplus sludge as the substrate for methanogenesis. The method completely utilizes the surplus sludge, and is short in reaction time; the methanogenesis rate is 0.10-0.25m<3>H2 / m<3>.d; and the protein removal rate is as high as 38%-58%, and the COD (chemical oxygen demand) removal rate is up to 38%-55%. Due to the higher removal rates of the protein and COD, the method for treating surplus sludge through the microbial electrolytic tank technology and recycling the energy product methane with higher economic value has the characteristic of combining productivity with reduction of environmental pollution.

Description

technical field [0001] The present invention relates to a method for producing methane. Background technique [0002] With the acceleration of my country's economic development and urbanization process, a large number of sewage treatment plants have been built and put into use, and the output of surplus sludge has also increased sharply. The most ideal disposal of excess sludge should be resource utilization, so that it has good ecological, environmental, economic and social benefits. However, the traditional treatment method of excess sludge cannot solve such problems. Therefore, it is of great significance to develop new energy, save energy consumption and purify the environment to produce methane from the excess sludge of sewage treatment plant through microbial electrolysis cell. [0003] Methane is the main component of biogas, and rising energy costs make biogas utilization play a decisive role in the economics of wastewater treatment. At the same time, methane provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 任南琪孙睿邢德峰田雨时张宇
Owner HARBIN INST OF TECH
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