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Method for promoting anaerobic digestion of sludge through microbial electrical mediation

An anaerobic digestion and electrical mediated technology, applied in biological sludge treatment, chemical instruments and methods, sludge treatment, etc. Sludge organic matter utilization rate is low and methane recovery rate is low, which can achieve the effect of sludge treatment effect and energy gain promotion, promoting sludge anaerobic digestion, and improving VSS removal rate.

Active Publication Date: 2014-07-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems existing in the existing sludge anaerobic fermentation process, such as difficulty in breaking the wall of sludge flocs, difficulty in fully releasing organic matter in sludge microbial cells to the liquid phase, low utilization rate of sludge organic matter and low recovery rate of methane , providing a method for microbial electro-mediated promotion of sludge anaerobic digestion

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  • Method for promoting anaerobic digestion of sludge through microbial electrical mediation
  • Method for promoting anaerobic digestion of sludge through microbial electrical mediation

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specific Embodiment approach 1

[0020] Specific embodiment 1: The method for promoting the anaerobic digestion of sludge by microbial electrical mediation in this embodiment is carried out according to the following steps:

[0021] 1. Sludge pretreatment: adjust the sludge concentration to 14000mg / L, use dual-frequency ultrasound to pretreat the sludge for 10 minutes, adjust the pH value of the sludge to 10 with sodium hydroxide solution, and then refrigerate for use;

[0022] 2. Microbiological acclimatization of anode electrolytic flora function: the single-chamber MEC reactor is used as the anaerobic acclimation device for microbial electrolysis, and a fixed microvoltage of 0.6-0.9V is added to both ends of the electrode, cultivated at 30°C, and the single-chamber MEC reactor is started. , 24h is a cycle, and the medium is replaced every 24h. After the medium is changed in the single-chamber MEC reactor, nitrogen with a purity of 99.998% is continuously introduced into the reaction chamber for 20min to rem...

specific Embodiment approach 2

[0025] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the dual-frequency ultrasonic treatment of the sludge in step 1 is carried out in a trough ultrasonic instrument equipped with ultrasonic generators with frequencies of 28kHz and 40kHz , The sound energy density of ultrasonic pretreatment is 0.25 ~ 1.0kW / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in step 2, an additional 0.8V microvoltage is added to both ends of the electrodes. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for promoting anaerobic digestion of sludge through microbial electrical mediation, and relates to a method for fast generating methane from organic waste biomass and at the method is used for solving the technical problems that the existing sludge anaerobic fermentation technology is difficult in sludge floc wall breakage, organic matters in sludge microbial cells is difficult to fully release to a liquid phase, and the utilization rate of organic matters of the sludge and the recovery rate of methane are low. The method comprises the following steps: I, pretreating sludge; II, performing the function microbial acclimation of an anode electrolysis flora; III, promoting the anaerobic digestion of sludge through microbial electrical mediation. According to the method, protons in a system can be more quickly converted by means of the electric mediation action of a microbial catalytic electrolysis system, complicated organic acid ingredients can be effectively converted in an electronic manner so as to eliminate the inhibition role of acid accumulation in the system, and the anaerobic digestion of sludge and the speed and yield of the generated methane can be effectively promoted. The method belongs to the fields of promoting sludge to generate methane through microbial electrolysis.

Description

technical field [0001] The invention relates to a method for rapidly producing methane from organic waste biomass. Background technique [0002] The potential harm of municipal sludge to the environment and the high cost of treatment make the reduction and resource utilization of sludge a worldwide concern, and the use of surplus sludge to produce methane is one of the most important ways to realize its resource utilization First, the anaerobic digestion process is currently the most feasible sludge stabilization process. Compared with other biochemical methods, the advantages of the anaerobic digestion process include (1) good treatment effect, and can degrade the organic matter in the sludge to the greatest extent; ( 2) The dehydration of digested sludge is good, which can greatly reduce the volume of sludge and realize the reduction and stabilization of sludge; (3) It can produce high-energy biogas, and the overall energy consumption of the process is low. [0003] Due t...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04
Inventor 王爱杰刘文宗蔡伟伟郭泽冲王羚周爱娟杨春雪
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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