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Method for producing methane by enhancing anaerobic digestion of municipal sludge based on electron transfer

An anaerobic digestion and municipal sludge technology, applied in biological sludge treatment, waste fuel, etc., can solve the problems of low methane production efficiency, slow hydrolysis acidification rate, etc., to improve methane production, accelerate hydrolysis acidification and methane generation, stable effect

Active Publication Date: 2020-12-18
TONGJI UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of slow hydrolysis acidification rate and low methane production efficiency in the existing anaerobic digestion technology, and to provide a method for strengthening anaerobic digestion of municipal sludge based on electron transfer to accelerate anaerobic digestion. Electron transfer rate in the digestive system, promote hydrolysis and acidification of organic matter and methanogenesis, and increase methane production

Method used

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  • Method for producing methane by enhancing anaerobic digestion of municipal sludge based on electron transfer
  • Method for producing methane by enhancing anaerobic digestion of municipal sludge based on electron transfer
  • Method for producing methane by enhancing anaerobic digestion of municipal sludge based on electron transfer

Examples

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Effect test

Embodiment 1

[0035] A method for enhanced anaerobic digestion of methane from sludge based on electron transport was implemented in batch methanogenesis experiments. Using the residual sludge of the secondary settling tank (TS=2.4%~5.3%, VS / TS=44.9%~60.4%) as the substrate, the digested sludge (TS=2.1%~4.8%) in the anaerobic digestion reactor is stably running, VS / TS=33.5%~47.3%) was used as the inoculum, and the methane production experiment of sludge anaerobic digestion was carried out in a serum bottle with a working volume of 1 L.

[0036] Add the iron-carbon composite conductive material 1 with a core-shell structure to the serum bottle, and the mass ratio of the iron-carbon composite conductive material 1 with the core-shell structure to the volatile solids of the residual sludge in the secondary sedimentation tank is 1:2; Add the inoculum sludge and the residual sludge of the secondary settling tank, and the mass ratio of the volatile solids of the inoculating sludge to the volatile...

Embodiment 2

[0048] This example differs from Example 1 in that the mass ratio of the iron-carbon composite conductive material with a core-shell structure to the volatile solids of the residual sludge in the secondary settling tank is 1:1, and the others are the same as in Example 1.

Embodiment 3

[0053] This example differs from Example 1 in that the mass ratio of the iron-carbon composite conductive material 2 with a core-shell structure to the volatile solids of the residual sludge in the secondary settling tank is 2:1, and the others are the same as in Example 1.

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Abstract

The invention relates to a method for producing methane by enhancing anaerobic digestion of municipal sludge based on electron transfer, which comprises the following steps: adding an iron-carbon composite conductive material with zero-valence iron as a core and a carbon material as a coating layer into an anaerobic digestion system, and enhancing the electron transfer rate of the anaerobic system, thereby promoting the hydrolysis acidification process and methane production process of sludge, and increasing the methane production. Compared with the prior art, the method has the advantages that the electron transfer rate among electro-active microorganisms in the sludge anaerobic system is increased through compounding of iron and carbon; the carbon layer can provide a good attachment point for microorganisms, meanwhile, the carbon layer is used as a protective layer of zero-valence iron to effectively control the dissolution amount of iron and reduce the loss amount of iron, and ironreduction type hydrolysis acidification bacteria can be enriched to promote degradation of organic matters while the zero-valence iron core provides electrons and improves the conductivity of the composite material. The method has the advantages of being low in cost, high in yield and stable in effect, the electron transfer rate in the anaerobic digestion process is increased, and the methane yield is increased.

Description

technical field [0001] The invention relates to the technical field of sludge anaerobic digestion, in particular to a method for strengthening the anaerobic digestion of urban sludge to produce methane based on electron transfer. Background technique [0002] With the wide application of wastewater biological treatment technology, the output of excess sludge is increasing day by day, and the cost of sludge disposal in sewage treatment plants often accounts for more than 50% of the total operating cost. The efficient resource utilization of excess sludge has become one of the key points of sludge treatment. Anaerobic digestion technology can efficiently bioconvert organic matter in sludge into CH with high calorific value 4 , has been widely used in wastewater treatment and sludge treatment. This technology realizes the high-efficiency recovery of energy in sludge, has good environmental and economic benefits, and is a promising biotechnology. [0003] In the traditional a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 戴晓虎刘昊宇李磊
Owner TONGJI UNIV
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