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Method of preparing flocculating agent by utilizing sludge and application thereof

A flocculant and sludge technology, which is applied in the preparation of flocculants from sludge and its application fields, can solve the problems of large differences in the application cost of pretreatment effects, etc., to facilitate transportation and storage, improve flocculation activity, and accelerate the settlement of suspensions Effect

Inactive Publication Date: 2013-03-20
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of different pretreatments and the application cost vary greatly

Method used

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  • Method of preparing flocculating agent by utilizing sludge and application thereof

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Effect test

Embodiment 1

[0023] The method of using sludge to prepare flocculant, such as figure 1 As shown, the dewatered sludge is made into a sludge mixture with 6 times the mass of tap water, and the pH is adjusted to 9.0~12.0 with an alkaline solution. It is centrifuged at a speed of 5000r / min, the supernatant is removed, the precipitate is used as a flocculant, the flocculant is washed 2-3 times with clean water, and a flocculant suspension of equal volume before centrifugation is prepared with clean water for use. The flocculation rate of the flocculant suspension to the kaolin suspension can reach 95.4%, and the turbidity removal rate of the dye wastewater is 83.1%.

Embodiment 2

[0025] The method of using sludge to prepare flocculant, such as figure 1 As shown, the remaining sludge suspension in the sewage treatment plant was left to stand to remove the supernatant, and then heated in a high-temperature and high-pressure sterilizer at 100-130°C for 30 minutes, stirred evenly and directly used for flocculation. The flocculant makes the sedimentation speed of the soil suspension 2~3 times of the original, and the turbidity removal rate of the activated carbon suspension can reach 92.6%, and the reaction time can be completed within 3 minutes.

Embodiment 3

[0027] Using sludge to prepare flocculant, use 10 times the mass of tap water to make a sludge mixture from dewatered sludge, adjust the pH to 10.0 with alkaline solution, keep it for 5 minutes, and then heat the reaction at about 90°C for 30 minutes, and the heating is completed , centrifuge it at a speed of 7000r / min, remove the supernatant, take the precipitate as a flocculant, wash the flocculant with water for 2-3 times, and use clean water to prepare a flocculant suspension of equal volume before centrifugation. use. The flocculation rate of the flocculant suspension to the kaolin suspension can reach 95.4%, and the turbidity removal rate of the dye wastewater is 84.6%.

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Abstract

The invention relates to a preparation process of preparing a flocculating agent by utilizing sludge, and discloses a method of preparing flocculating agent by utilizing sludge and application thereof. The method comprises the following steps: mutually connecting the two pretreatments of the sludge in series to change the virtual structure of the sludge, changing physical and chemical properties of the sludge particles and microbial cells in the sludge, and enabling the sludge to possess higher adsorption property of the flocculating agent. The flocculation rate to kaolin can be up to 95% above. The processing method mainly comprises the steps of adjusting the pH value, heating and centrifuging and so on. The process has the characteristics of low cost, simple process, short preparation time, convenience in application and good processing effect and the like.

Description

technical field [0001] The invention relates to a preparation process for flocculant preparation by using excess sludge, in particular to a method and application for preparing flocculant by utilizing excess sludge or dewatered sludge. Background technique [0002] As a by-product of the water treatment process, excess sludge is mainly composed of various microbial cells, and its main components are organic matter such as protein, polysaccharide, nucleic acid, etc., and has certain similarities with microbial flocculants in composition. The use of excess sludge to prepare biological flocculants can not only avoid the secondary pollution of chemical flocculants, but also overcome the high cost of microbial flocculants. Moreover, the daily output of sludge in sewage plants is very large, and its treatment and disposal has always been a difficult problem to solve. This method can effectively solve the problem of sludge treatment and achieve the purpose of resource utilization. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F1/52C02F1/54
Inventor 杨春平彭蓝艳吴斌郭俊元曾光明吕黎何慧军
Owner ZHEJIANG GONGSHANG UNIVERSITY
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