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Pretreatment method of strengthening anaerobic digestion of sludge with compound microbial 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 large digester volume, long digestion cycle, and low biogas generation rate, etc. problems, to achieve the effect of increasing the degradation rate, improving the settling performance, and accelerating the sludge hydrolysis process

Active Publication Date: 2015-09-23
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 of strengthening anaerobic digestion of sludge with compound microbial agent
  • Pretreatment method of strengthening anaerobic digestion of sludge with compound microbial agent
  • Pretreatment method of strengthening anaerobic digestion of sludge with compound microbial agent

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Embodiment Construction

[0023] The pretreatment method for enhancing anaerobic digestion of sludge by using composite microbial agents of the present invention includes the following steps:

[0024] (1) Concentrate the remaining sludge to a suspended solids (SS) concentration of 20000-35000mg / L, preferably to 20000-30000 mg / L; volatile solids (VSS) / suspended solids in the remaining sludge (SS)>50%;

[0025] (2) Pretreatment of surplus sludge: The concentrated surplus sludge is added to the conditioning tank, and then a certain amount of composite microbial agent is added, and the reaction is carried out by fully stirring. The dosage of the composite microbial agent can be 0.1 to 1‰ of the concentrated remaining sludge (by volume ratio); the stirring speed can be 20 to 60 r / min; the reaction time is preferably 24 to 72 hours.

[0026] (3) Connect the pretreated surplus sludge in the conditioning tank to the anaerobic digestion tank according to a certain proportion. The anaerobic digestion tank contains the...

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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 sludge treatment and disposal, in particular to a method for pretreatment of sludge requiring anaerobic digestion treatment by using a composite microbial inoculant. 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 has also increased. At present, sludge is mainly processed in the form of composting, landfilling and random outbound transportation, which is in a chaotic state. The proportion is roughly 10% for composting, 20% for landfilling, and 70% for random outbound simple landfill and stacking. The sludge problem is gradually arousing the attention of sewage treatment plants and the public. In addition to containing a large amount of organic matter and nutrients such as nitrogen and phosphorus, the sludge also contains a large number of bacteria, pathogenic microorganisms, parasites, toxi...

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Application Information

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Patent Type & Authority Patents(China)
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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