Biological wall-breaking method for improving sludge dewatering performance

A sludge dewatering and biological technology, applied in water/sludge/sewage treatment, sludge treatment, sludge treatment, etc., can solve problems such as unreported, achieve high ecological and hygienic safety, and save energy consumption for treatment and disposal space, the effect is remarkable

CN105254155AActive Publication Date: 2016-01-20余冉 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-01-20

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Abstract

The invention relates to a biological wall-breaking method for improving sludge dewatering performance, and belongs to the technical field of sludge treatment. According to the method, the phagocytosis characteristic that bdellovibrio can widely and effectively decompose Gram-negative bacteria is sufficiently utilized, bdellovibrio is combined with other microorganisms to prepare bdellovibrio complex microbial inoculants which are applied to the treatment process of excess sludge of the biological treatment process of a municipal wastewater treatment plant so that the dewatering performance of treated sludge can be improved by 30% or higher after subsequent plate frame press filtering or centrifugal dewatering or other physical treatment, and therefore the sludge reduction efficiency is improved. The method treats remaining sludge of the municipal wastewater biological treatment process, is little in device investment, easy to operate, safe, free of pollution and low in energy consumption, and has good economic benefits and environment benefits, and a new method for municipal sludge biological dewatering reduction treatment is developed.
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Description

Technical field

[0001] The present invention involves a method of biological wall breaking, mainly involving the method of biological wall breaking the biological wall breaking performance of sludge dehydration, which is the field of sludge treatment technology. Background technique

[0002] In recent years, with the development of society and the increase in public environmental awareness, the treatment rate of municipal sewage has also increased rapidly.As the final ring of municipal sewage treatment, a large amount of water content with a water content of more than 95%(generally accounts for about 0.15%to 1%of the water volume of water) and requires treatment.At present, the cost of sludge treatment is high, accounting for about 25%to 40%of the operating costs of sewage plants.Therefore, the treatment and disposal of municipal sludge has become an environmental issue that is concerned about in the world, and various investigations and statistics at home and abroad have shown t...

Examples

Embodiment 1

[0021] see figure 1 , figure 2 , using this process to carry out batch treatment of sludge in the laboratory, the treated sludge is the secondary sedimentation tank sludge produced by the oxidation ditch process to treat municipal sewage.

[0022] (1) Preparation of Bdellovibrio solution

[0023] Prepare the Bdellovibrio agent in advance, and the concentration of Bdellovibrio in the Bdellovibrio agent reaches 10 7 pfu / mL order of magnitude.

[0024] (2) Pretreatment of sludge

[0025] After natural sedimentation of the sludge, the lower layer of sludge is removed, and its water content basically reaches 97-98%. The pH of the sludge is measured at 6.75, and the temperature of the sludge is measured at 25°C. No adjustment is required. Stir the sludge evenly and begin to pack it to In 1000mL glass bottles, each glass bottle contains 650mL sludge;

[0026] (3) Dosing of Bdellovibrio bacterial agent;

[0027] The experiment is divided into experimental group and control group...

Embodiment 2

[0035] (1) Preparation of a Bdellovibrio composite bacterial agent

[0036] Prepare the mixed bacterial liquid of Bdellovibrio, photosynthetic bacteria and yeast flora in advance as the bacterial liquid of Bdellovibrio composite bacterial agent, wherein the concentration of Bdellovibrio is 10 8 pfu / mL order of magnitude.

[0037] (2) Pretreatment of sludge

[0038] The treated sludge is the oxidation ditch sludge produced by the oxidation ditch process to treat municipal sewage. After natural sedimentation of the sludge, the lower layer of sludge is removed, and its water content basically reaches 97-98%. The result of the sludge pH measurement is 7.0, and the sludge temperature is 18°C. In 1000mL glass bottles, each glass bottle contains 650mL sludge;

[0039] (3) Dosing of Bdellovibrio bacterial agent;

[0040] The dosing method of the bacterial agent is the same as in Example 1, and samples are taken every 12 hours to measure the specific resistance of the sludge and th...

Embodiment 3

[0044] (1) Preparation of a Bdellovibrio composite bacterial agent

[0045] Prepare the mixed bacterial liquid of Bdellovibrio, lactic acid bacteria group and Bacillus pumilus in advance as the bacterial liquid of Bdellovibrio compound bacterial agent, wherein the concentration of Bdellovibrio is 10 7 pfu / mL order of magnitude.

[0046] (2) Pretreatment of sludge

[0047] The treated sludge is the residual sludge produced by the SBR process for treating municipal sewage. After natural sedimentation of the sludge, the lower layer of sludge was removed, and its water content basically reached 96-97%. The pH of the sludge was measured to be 6.9, and the temperature of the sludge was measured to be 28°C. No adjustment is required. Stir the sludge evenly and start distributing to In 1000mL glass bottles, each glass bottle contains 650mL sludge;

[0048] (3) Dosing of Bdellovibrio bacterial agent;

[0049] The dosing method of the bacterial agent is the same as that of Example 1...