A biological wall breaking method for improving sludge dewatering performance

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

Active Publication Date: 2018-07-20
余冉 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the application of Bdellovibrio in the cell wall breaking and sludge reduction of surplus sludge in municipal sewage treatment plants

Method used

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  • A biological wall breaking method for improving sludge dewatering performance
  • A biological wall breaking method for improving sludge dewatering performance
  • A biological wall breaking method for improving sludge dewatering performance

Examples

Experimental program
Comparison scheme
Effect test

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 was removed, and its water content basically reached 97-98%. The pH of the sludge was measured to be 6.75, and the temperature of the sludge was measured to be 25°C. 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.

[0028] The same batch of pretreated sludge was used as the s...

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...

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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.

Description

technical field [0001] The invention relates to a biological wall-breaking method, mainly relates to a biological wall-breaking method for improving sludge dehydration performance, and belongs to the technical field of sludge treatment. Background technique [0002] In recent years, with the development of society and the increase of public awareness of environmental protection, the rate of municipal sewage treatment has also increased rapidly. As the last step of municipal sewage treatment, a large amount of excess sludge with a moisture content of over 95% (generally accounting for about 0.15% to 1% of the treated water volume) is generated and needs to be treated and disposed of. 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 of common concern in the world, and various investigations and statistical data a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/02C02F11/12
CPCY02W10/20
Inventor 余冉张诗文黄瑛陈舟凯叶蓉康诗佳高磊苏文强杨安康
Owner 余冉
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