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Method for promoting anaerobic digestion of residual activated sludge to generate methane by pretreatment combined electrochemical technology

An electrochemical technology and anaerobic digestion technology, which is applied in the field of pretreatment combined with electrochemical technology to promote anaerobic digestion of residual activated sludge to produce methane, can solve the problems of long anaerobic fermentation time and low efficiency, and improve biodegradability , to achieve the effect of reduction

Inactive Publication Date: 2016-06-01
LIAONING UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for pretreatment combined with electrochemical technology to promote the anaerobic digestion of excess activated sludge to produce methane, aiming at the shortcomings of long anaerobic fermentation time and low efficiency in traditional sludge anaerobic digestion Combined pretreatment of sludge, and then use MEC-AD coupling reactor to promote anaerobic digestion of excess activated sludge to produce methane with microbial electrolysis hydrogen production technology, so as to realize the reduction and resource utilization of sludge in urban sewage treatment plants

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  • Method for promoting anaerobic digestion of residual activated sludge to generate methane by pretreatment combined electrochemical technology
  • Method for promoting anaerobic digestion of residual activated sludge to generate methane by pretreatment combined electrochemical technology
  • Method for promoting anaerobic digestion of residual activated sludge to generate methane by pretreatment combined electrochemical technology

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Embodiment 1

[0031] Example 1 A method of pretreatment combined with electrochemical technology to promote anaerobic digestion of excess activated sludge to produce methane

[0032] The sludge was taken from the remaining activated sludge in the secondary settling tank of a sewage treatment plant in Harbin.

[0033] The steps are

[0034] 1) Acclimatization and cultivation of anode carbon brushes in microbial electrolytic cells

[0035] The anode carbon brush is made of the anode with a diameter of 25.0mm, a length of 25.0mm, and a surface area of ​​0.22m 2The carbon brushes are made by first soaking the carbon brushes in acetone for 24 hours, and then burning them in a muffle furnace at a temperature of 450°C for 30 minutes. The cathode is a carbon cloth coated with a Pt / C catalytic layer, only one side of the carbon cloth is coated with a catalytic layer, and the area of ​​the catalytic layer is 7.0cm 2 With breathable waterproof layer.

[0036] Under the conditions of high temperatu...

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Abstract

The invention discloses a method for promoting anaerobic digestion of residual activated sludge to generate methane by a pretreatment combined electrochemical technology. The method comprises the following steps: 1) concentration treatment of sludge; 2) combined pretreatment of sludge: performing ultrasonic pretreatment of sludge and alkaline pretreatment to obtain pretreated sludge; and 3) microbial electrolysis cell coupling with anaerobic digestion of sludge to generate methane: feeding the sludge after the combined pretreatment into a MEC-AD coupling reactor and fermenting to generate methane. In the method, the pretreatment combined microbial electrolysis cell hydrogen generation technology is used for the first time, and the reduction and resource utilization of the sludge from a municipal sewage treatment plant are realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for promoting the anaerobic digestion of residual activated sludge to produce methane by combining pretreatment with electrochemical technology. Background technique [0002] In recent years, due to the accelerated development of urbanization, more and more sewage has entered urban sewage treatment plants, resulting in a large amount of excess sludge. At present, the operating cost of sludge treatment and disposal has accounted for more than 50% of sewage treatment plants, which is becoming an urgent problem to be solved. The remaining sludge contains a large amount of non-toxic organic matter, and the main component is the bacteria gelatin group composed of microorganisms in the water treatment process, which is an important recycling resource. However, due to the long time required and low efficiency of the hydrolytic fermentation stage of sl...

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Application Information

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IPC IPC(8): C02F11/00C02F11/04C02F11/12
CPCC02F11/006C02F11/04C02F11/121C02F2303/06C02F2303/10Y02E50/30
Inventor 包红旭张浩杨华蔡伟伟王爱杰刘文宗张晋沈曼莉陈春晓李丽丹
Owner LIAONING UNIVERSITY
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