Sludge dewatering method using microbial cracking pretreatment coupled with PAM flocculant chemical flocculation

A technology of chemical flocculation and sludge dehydration, applied in biological sludge treatment, chemical instruments and methods, sludge treatment, etc., can solve the secondary pollution of factory sludge, hygiene and safety, reduce the use of chemical flocculants, and sludge treatment Process difficulties and other problems, to achieve the effect of reducing the biological reaction time and the frequency of microbial agent dosing, increasing the dehydration capacity, and reducing the biological reaction time

Pending Publication Date: 2020-01-14
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The present invention is aimed at the technical and environmental problems existing in sludge dehydration pretreatment using only PAM single chemical flocculant, specifically for the large amount of flocculant dosage in the existing sludge dewatering method, high cost and difficult dehydration. The effect is unsatisfactory and it will lead to problems such as difficulty in sludge subsequent disposal and secondary pollution. The present invention provides for the first time a sludge dehydration method using microbial cracking pretreatment coupled with PAM flocculant chemical flocculation. The technical problem to be solved is to provide a Using the biochemical combination technology of microbial pretreatment coupled with PAM flocculant sludge dewatering, comprehensively using the principles of microbial cracking, EPS and SMP degradation, combined with PAM chemical flocculant flocculation, to achieve increased sludge dewatering capacity, shortened reaction time, and chemical flocculation Reduce the amount of chemical agent used, reduce the effect of harmful bacteria in the sludge, solve the difficulties in the sludge treatment process, secondary pollution and health and safety problems of the sludge from the factory

Method used

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  • Sludge dewatering method using microbial cracking pretreatment coupled with PAM flocculant chemical flocculation
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  • Sludge dewatering method using microbial cracking pretreatment coupled with PAM flocculant chemical flocculation

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Experimental program
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Effect test

Embodiment 1

[0030] 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.

[0031] (1) Preparation of phage-type bacterial compound bacterial agent

[0032] Preparing phage-type Bdellovibrio, Bdellovibrio Stoop, and Bdellovibrio Starr in advance as a phage-type bacterial compound agent The mixed concentration is 10 8 pfu / mL order of magnitude. Among them, the phage-type Bdellovibrio strain is named SDWB01, which was deposited in the General Microbiology Center of China Committee for the Collection of Microorganisms on May 12, 2016, and the preservation number is CGMCC No. 11671.

[0033] Bdellovibrio Stoop and Bdellovibrio Starr can be obtained from common strains by routine screening in sludge.

[0034] (2) Preparation of PAM flocculant solution

[0035] Prepare the PAM flocculant solution in advance: select ...

Embodiment 2

[0049] see image 3 , using this process to carry out batch treatment of sludge in the laboratory, the treated sludge is the secondary sedimentation tank sludge produced by MBR membrane bioreactor process treatment of municipal sewage.

[0050] (1) Preparation of phage-type bacterial compound bacterial agent

[0051] Prepare Bdellovibrio phage, yeast group, and Gram-positive actinomycetes in advance as a bacteriophage-type bacterial compound bacterial liquid, in which Bdellovibrio phage, yeast group, and Gram-positive actinomycetes The mixing concentration is 10 9 pfu / mL order of magnitude. Among them, the bacteriophage Bdellovibrio strain is named SDWB01, which has been preserved in the General Microorganism Center of China Committee for the Collection of Microbial Cultures on May 12, 2016, and the preservation number is CGMCC No. 11671.

[0052] Yeasts and Gram-positive actinomycetes are selected from the yeast products (product number 20205) and gram-positive actinomycet...

Embodiment 3

[0069] see Figure 4 , 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 A2 / O process to treat municipal sewage.

[0070] (1) Preparation of phage-type bacterial compound bacterial agent

[0071] Prepare Bdellovibrio phage, Gram-positive actinomycetes, and filamentous bacteria of the fermentation system in advance as a bacteriophage-type bacterial compound bacterial agent, in which Bdellovibrio phage, Gram-positive actinomycetes , The mixed concentration of the filamentous flora of the fermentation system is 10 6 pfu / mL order of magnitude. Among them, the bacteriophage Bdellovibrio strain is named SDWB01, which has been preserved in the General Microorganism Center of China Committee for the Collection of Microbial Cultures on May 12, 2016, and the preservation number is CGMCC No. 11671. Gram-positive actinomycetes and filamentous bacteria are selected from the Gram-posi...

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Abstract

The invention relates to a sludge dewatering method using microbial pretreatment coupled with PAM flocculant chemical flocculation, and belongs to the technical field of sludge treatment. Aiming at the problem in an existing sludge dewatering method that a flocculant addition amount is large, the cost is high, dewatering effects are unsatisfactory, and difficulty in subsequent disposal of sludge and secondary pollution can be caused, the method makes full use of a series of bacteria with bacteriophage ability, the bacteria parasitize and crack sludge bacterial cells to obtain proteins and other substances required for growth, the bacteria is prepared into a bacteriophage-type bacterial complex, and is used in coordination with PAM to pretreat excess sludge of a municipal sewage treatment plant, and thereby the sludge structure is effectively destroyed, the sludge dewatering performance is improved, and then a conventional mechanical dewatering apparatus of the sewage plant is used to carry out the whole process of sludge dewatering. On the basis of reducing a use amount of a conventional PAM flocculant by 20-35%, the sludge dewatering performance can be improved by 5% or more. Themethod is used to treat excess sludge of a municipal sewage biological treatment process, the sludge dewatering performance is improved, the use of chemical agents is reduced, harmful pathogenic bacteria in the sludge are reduced, the resource potential of sludge subsequent disposal is improved, and thereby the method has good economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to a sludge dewatering method, in particular to a sludge dewatering method using microbial cracking pretreatment coupled with PAM flocculant chemical flocculation, and belongs to the technical field of sludge treatment coupled with biotechnology and chemical technology. Background technique [0002] Municipal sewage treatment plants generally use biological methods to purify wastewater, resulting in a large amount of residual sludge with a water content of more than 95%. With the popularization of urban sewage treatment facilities in our country, the improvement of treatment rate and the deepening of treatment degree, the amount of surplus sludge has increased tremendously. Excess sludge has the characteristics of large output, high moisture content, perishable and smelly, and its treatment and disposal costs are high. Therefore, the effective and safe reduction of sludge is a worldwide problem. At present, the sludge dehydration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/147
CPCC02F11/02C02F11/147
Inventor 余冉高磊崔崟丁江涛张涛崔婷婷张钰淇张杉魏昕薛源
Owner SOUTHEAST UNIV
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