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Pretreatment method for enhancing anaerobic sludge digestion by virtue of compound microorganism bacterium agent

A compound microbial agent and anaerobic digestion technology, which is applied in biological sludge treatment, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of low biogas production rate, large digester volume, and long digestion cycle, etc. problems, to achieve the effect of accelerating the sludge hydrolysis process, increasing the degradation rate, and improving the sedimentation performance

Active Publication Date: 2014-11-19
河北协同环境科技有限公司
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a pretreatment method for enhancing anaerobic digestion of sludge by using a compound microbial agent, so as to solve the problems of long digestion cycle, bulky digestion tank, and low biogas generation rate in the mesophilic anaerobic digestion process. question

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  • Pretreatment method for enhancing anaerobic sludge digestion by virtue of compound microorganism bacterium agent
  • Pretreatment method for enhancing anaerobic sludge digestion by virtue of compound microorganism bacterium agent
  • Pretreatment method for enhancing anaerobic sludge digestion by virtue of compound microorganism bacterium agent

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Embodiment Construction

[0023] The present invention utilizes the pretreatment method of composite microbial bacterial agent to strengthen the anaerobic digestion of sludge comprising the following steps:

[0024] (1) Concentrate the excess sludge to a suspended solids (SS) concentration of 20,000-35,000 mg / L, preferably 20,000-30,000 mg / L; volatile solids (VSS) / suspended solids in excess sludge (SS) > 50%;

[0025] (2) Pretreatment of excess sludge: Add the concentrated excess sludge into the conditioning tank, then add a certain amount of compound microbial agent, and fully stir for reaction. The dosage of the compound microbial agent can be 0.1-1‰ of the concentrated excess sludge (according to the volume ratio); the stirring speed can be 20-60r / min; the reaction time is preferably 24-72h.

[0026] (3) Connect the pretreated excess sludge in the tempering tank to the anaerobic digestion tank in a certain proportion. The anaerobic digestion tank holds the anaerobic sludge to be treated, and the pr...

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Abstract

The invention discloses a pretreatment method for enhancing anaerobic sludge digestion by virtue of a compound microorganism bacterium agent. The pretreatment method comprises the following steps: concentrating residual sludge, adding a compound microorganism bacterium agent, performing stirring reaction, inoculating the pretreated residual sludge into an anaerobic digestion pond according to a certain ratio, and performing mesophilic anaerobic digestion on anaerobic sludge, wherein the compound microorganism bacterium agent is prepared by mixed fermentation of 5%-20% of each of bacillus subtilis, streptomyces albus, streptomyces griseus, candida utilis, aspergillus sojae, lactobacillus bulgaricus, lactococcus lactis, rhodopseudomonas palustris, rhodopseudomonas capsulate and rhodopseudomonas spheroides, the total viable count is not less than 2*108 / ml, and the pH value of the compound microorganism bacterium agent is 3-4. According to the method, the sludge hydrolysis process can be accelerated, the sludge retention time can be shortened, the biological gas production rate can be increased, and the anaerobic digestion efficiency can be improved.

Description

technical field [0001] The invention relates to a method for treating and disposing of sludge, in particular to a method for pretreating sludge requiring anaerobic digestion treatment by using a compound microbial bacterial agent. Background technique [0002] With the development of the national economy, a large number of sewage treatment plants have been built and operated, and the output of urban sludge is also increasing. At present, sludge is mainly processed in the form of composting, landfilling and random external transportation, which is in a chaotic state. The proportion is roughly 10% for composting, 20% for landfilling, and 70% for simple landfilling and stacking for random external transportation. The sludge problem is gradually attracting the attention of sewage treatment plants and the public. In addition to a large amount of organic matter and nutrients such as nitrogen and phosphorus, sludge also contains a large number of bacteria, pathogenic microorganism...

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Application Information

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IPC IPC(8): C02F11/00C02F11/02C02F11/04
Inventor 卢琼刘洪泉李成义
Owner 河北协同环境科技有限公司
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