Method used for improving waste active sludge dehydration performance through adding of bacterial broth

A technology of microbial fermentation liquid and activated sludge, applied in biological sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of poor dehydration performance, high treatment and disposal cost, secondary pollution, etc., and achieve flocculation capacity Strong, simplified sludge dewatering process, high stability effect

Active Publication Date: 2019-08-09
ZHEJIANG GONGSHANG UNIVERSITY
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Problems solved by technology

[0005] The patent of the present invention aims at the poor dehydration performance of sludge in urban and industrial sewage treatment plants and the high cost of subsequent treatment and disposal of mud cakes, and overcomes the economic limitations of conventional physical and chemical means to treat sludge, and provides a method of adding microbial fermentation liquid to condition sludge The method and the waste activated sludge prepared by the method and the application of the waste activated sludge can improve the dehydration performance of the sludge, the cost is low, and the purpose of realizing sludge reduction and resource disposal can be achieved while avoiding problems such as secondary pollution

Method used

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  • Method used for improving waste active sludge dehydration performance through adding of bacterial broth

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Culture of microorganisms

[0035] 1.1 Cultivation of Aspergillus niger

[0036] 1) Separation and purification of Aspergillus niger: Dilute the Aspergillus niger spore suspension in sequence with different concentration gradients (10 2 ~10 8 ), Aspergillus niger was inoculated on Sabouraud dextrose agar medium (SDA) by the spread plate method, and sterilized by high-pressure steam at 121° C. for 30 minutes. After inoculation, the petri dish was inverted and incubated in a biochemical incubator at 28°C for 48 hours. Pick the colony on the glass petri dish by streaking on the plate, repeat the above steps 4 times, pick a little bacterial lawn of a single colony, apply it on a glass slide, observe the individual morphology under the microscope, and comprehensively analyze the morphological characteristics of the colony. If it is not pure, it is necessary to continue the separation and purification with the plate streak method. If it is pure, inoculate it on the sl...

Embodiment 2

[0055] (1) For the cultivation of microorganisms, refer to Example 1.

[0056] (2) Preparation of waste molasses fermentation culture liquid: take waste molasses, a by-product of industrial sugar production, and add it to the dilution tank, add water and stir to dilute to 40%, and the dilution of waste molasses by volume: waste activated sludge is 4-8:1 mixed , making waste molasses fermentation culture liquid, and the fermentation culture liquid was sterilized by high-pressure steam at 120° C. for 30 minutes for later use.

[0057] (3) Preparation of composite microbial fermentation broth: inoculate each microorganism into waste molasses fermentation broth at 35 ℃, 160-180r / min under the conditions of fermentation for 2 days to obtain a complex microbial fermentation broth.

[0058] (4) Sludge dehydration treatment: According to the volume ratio of composite microbial fermentation broth:activated sludge ratio of 1:12, the composite microbial fermentation broth was directly p...

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Abstract

The invention discloses a method used for improving waste active sludge dehydration performance through adding of bacterial broth. According to the method, aspergillus niger, Pseudomonas aeruginosa, Streptococcus thermophilus, and Rhodococcus rhodococcus are adopted, a fermentation culture solution is prepared from a waste molasses diluted solution and waste active sludge; the fermentation culturesolution is inoculated with the above four microbes respectively at certain ratios, fermentation is carried out for 2 to 5d at 25 to 35 DEG C 160-180r/min so as to obtain a composite bacterial broth;the composite bacterial broth is added into waste active sludge, stirring reaction is carried out for 4h, dehydration is carried out, and after conditioning, sludge water content is reduced to be lower than 50%. The bacterial broth is excellent in adaptability on temperature and pH value, and excellent in flocculation capability, dehydration effect is improved obviously; the method is simple; cost is low; sludge obtained through dehydration treatment can be taken as a plantation substrate or a microbial fertilizer; and sludge resource utilization is promoted.

Description

technical field [0001] The invention relates to the technical fields of environmental engineering and sludge treatment, in particular to a method for improving the dewatering performance of waste activated sludge by adding microbial fermentation liquid. Background technique [0002] In recent years, with the acceleration of my country's urbanization process and the improvement of environmental quality standards, the amount of sewage to be treated has increased sharply. Therefore, various sewage treatment processes such as oxidation ditch, biological filter and oxidation pond have been widely used at this stage, and finally Lead to a large amount of another pollutant (sludge) in sewage treatment. [0003] At present, the treatment and disposal methods of sludge mainly include sanitary landfill, incineration, manufacturing fertilizer, manufacturing building materials, etc., all of which require sludge to be dehydrated and dried, that is, to reduce the moisture content in the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/12
CPCC02F11/02C02F11/12
Inventor 蔡美强张昱温玉婷宋志军连广浒金米聪沈晓庆徐子雨施跃锦
Owner ZHEJIANG GONGSHANG UNIVERSITY
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