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Method for improving dewatering property of sludge by biological conditioning

A sludge dewatering and sludge technology, applied in the field of environmental engineering, can solve problems such as environmental pollution, and achieve the effects of avoiding environmental risks, significant dehydration effect, and obvious volume reduction.

Active Publication Date: 2018-10-26
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the use of elemental sulfur poses a risk of environmental pollution

Method used

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  • Method for improving dewatering property of sludge by biological conditioning

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Cultivate bacillus pumilus, pseudomonasdenitrificans, pseudomonas fluorescens, aquaspirillumgracile, and aquaspirillumdispa according to conventional methods. The total number of cells is 100%, and the number of cells is 15%, 20%, 25%, 30%, and 10% respectively. Mix them and add them to the complex biological culture medium in a sterile environment for multiplication and cultivation. Until the total number of bacteria in the compound bacterial solution reaches 1×10 9 Above cfu / ml, it is a composite biological bacterial liquid.

[0028] Take fresh sludge from a sewage treatment plant in Shanghai, and inoculate the composite biological bacteria into the sludge according to the volume ratio (v / v) of the composite biological bacteria liquid to the sludge. Into the biological fermentation tank, stirring and culturing at room temperature until the total number of complex biological bacteria cells reaches 10 7 Pieces / mL, the required inoculum is obtained.

[0029] Take sludge (slu...

Embodiment 2

[0032] Cultivate bacillus pumilus, seudomonas denitrificans, pseudomonas fluorescens, aquaspirillum gracile and aquaspirillumdispa according to conventional methods to The total number of bacteria is 100%, and the number of bacteria is 20%, 20%, 20%, 25%, and 15% respectively. Mix them and add them to the composite biological culture medium under aseptic environment for multiplication and cultivation. , Until the total number of bacteria in the compound bacterial solution reaches 1×10 9 Above cfu / ml, it is a composite biological bacterial liquid.

[0033] Take the fresh sludge from the municipal sewage treatment plant, inoculate the composite biological bacteria into the sludge according to the volume ratio (v / v) of the composite biological bacteria liquid to the sludge, and place the sludge inoculated with the composite biological bacteria into the sludge. In the biological fermentation tank, stirring and culturing at room temperature until the total number of complex biological...

Embodiment 3

[0037] Cultivate bacillus pumilus, pseudomonasdenitrificans, pseudomonas fluorescens, aquaspirillumgracile, and aquaspirillumdispa according to conventional methods. The total number of cells is 100%, and the number of cells is 20%, 15%, 25%, 25%, and 15% respectively. Mix them and add them to the complex biological culture medium in a sterile environment for multiplication and cultivation. Until the total number of bacteria in the compound bacterial solution reaches 1×10 9 Above cfu / ml, it is a composite biological bacterial liquid.

[0038] Take the fresh sludge from the municipal sewage treatment plant, inoculate the composite biological bacteria into the sludge according to the volume ratio (v / v) of the composite biological bacteria liquid to the sludge, and place the sludge inoculated with the composite biological bacteria into the sludge. In the biological fermentation tank, stirring and culturing at room temperature until the total number of complex biological cells reache...

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Abstract

The invention discloses a method for improving the dewatering property of sludge by biological conditioning. In the method, the effect of compound biological florae is utilized for reducing the content of sludge extracellular polymers and the sludge viscidity and accelerating the endogenous digestion of the sludge, so that the dewatering property of the sludge is greatly improved, and the moisturecontent of the sludge is reduced to 60% or below after the conditioned sludge is subjected to high-pressure plate-frame pressure filtration. The method includes the steps that the sewage of an urbansewage treatment plant is taken, an inoculum and a biological nutritional agent are added, the mixture is introduced into a biological conditioning tank in a continuous flow manner and is continuouslystirred, then the sludge is discharged into a sewage storage tank, a chemical conditioning agent is added according to a conventional conditioning method, and the mixture is conveyed to a high-pressure plate-frame filter press for pressure filtration treatment. The method is high in dewatering rate, low in operation cost and easy to operate and provides a new technical choice for low-cost and high-efficiency dewatering of the sewage treatment plant.

Description

Technical field [0001] The invention relates to a method for improving the dewatering performance of sludge by biological conditioning, and belongs to the technical field of environmental engineering. Background technique [0002] In recent years, with the increase in the number of urban sewage treatment plants, the output of sludge from urban sewage treatment plants has also increased rapidly. The sludge of municipal sewage treatment plant has the characteristics of small particles, high organic content and high moisture content, and its dewatering performance is poor. In order to facilitate the subsequent treatment and disposal of the sludge, the sludge produced by the municipal sewage treatment plant must be dehydrated. However, after the conventional iron salt, aluminum salt, and polyacrylamide are used for mechanical dehydration treatment, the moisture content of the sludge is still as high as 78% or more, which causes the drying energy consumption to remain high when the s...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/12C02F11/14
CPCC02F11/04C02F11/12C02F11/122C02F11/14C02F2303/06C02F2305/06
Inventor 朱南文黄秋杰沈雁文袁海平王玉辉尹常凯苑荣雪
Owner SHANGHAI JIAO TONG UNIV
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