Chemical enhancing pretreatment method of sludge anaerobic digestion

A technology of anaerobic digestion and anaerobic digestion system, which is applied in the field of sludge recycling and reduction treatment and disposal, which can solve the problems of long cycle and the inability of substrate to be utilized by anaerobic microorganisms.

Active Publication Date: 2012-12-26
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

However, the period of sludge anaerobic digestion is longer, the main reason is that due to the presence of microbial cell walls (membranes), the matrix in the cells cannot be utilized by anaerobic microorganisms.

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  • Chemical enhancing pretreatment method of sludge anaerobic digestion

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing and embodiment this patent will be further described.

[0011] In the sludge treatment process of the sewage plant, a sludge pretreatment tank 3 is set between the sludge concentration tank 1 and the anaerobic digestion tank 2, such as figure 1 shown. The sludge pretreatment pool 3 is connected with the ferrate waste liquid pool 4, and a stirring device 5 is arranged in the sludge pretreatment pool 3. The sludge inlet end 6 of the sludge pretreatment tank is connected to the sludge outlet end 7 of the sludge thickening tank, the sludge outlet end of the sludge pretreatment tank is connected to the mud inlet end of the anaerobic digestion tank, and the waste liquid of the sludge pretreatment tank The inlet is connected to the ferrate waste sump. A waste liquid input pump 8 is provided between the waste liquid inlet of the sludge pretreatment tank 3 and the ferrate waste liquid tank 4, and a waste liquid input pump 8 is pro...

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Abstract

The invention relates to a chemical enhancing pretreatment method of sludge anaerobic digestion. The method is characterized in that perferrate production waste liquid is added into sludge, and the pH value of sludge is controlled below 11; the materials are well mixed by stirring; the obtained sludge is added into an anaerobic digestion system, and mesophilic anaerobic digestion is carried out. According to the invention, anaerobic digestion gas yield of the pretreated sludge is improved by more than 60% than that of untreated raw sludge. The invention has the advantage that when the anaerobic digestion efficiency of sludge is improved, a treatment and disposal problem of perferrate production waste liquid is solved. Harms to the environment and to public health caused by discharging are avoided, and perferrate production waste liquid can be utilized as a resource.

Description

technical field [0001] The invention relates to a sludge resource and reduction treatment and disposal method, and more specifically relates to a method for pretreating sludge with industrial waste to improve the efficiency of sludge anaerobic digestion. Background technique [0002] A large amount of sludge is produced in the process of sewage treatment, especially in the beginning of the "Twelfth Five-Year Plan", the treatment and disposal of sludge is one of the current environmental issues that have attracted much attention. Sludge anaerobic digestion technology has been widely used in many countries today. However, the period of sludge anaerobic digestion is longer, mainly because the presence of microbial cell walls (membranes) prevents the intracellular matrix from being utilized by anaerobic microorganisms. At present, there are many methods for sludge pretreatment, such as ultrasonic method, pre-heating method, mechanical method, alkaline hydrolysis method, and com...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 王国华孙晓谭学军刘明明王恩顺
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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