Method for treating sludge through refluxing of acidified fermentation liquor and application of method

A technology of acidification fermentation and fermentation liquid, which is applied in the direction of biological sludge treatment, waste fuel, etc., can solve the problems of process pollution and energy consumption, save operation and investment costs, increase the amount of methane produced by digestion, and improve the efficiency of gas production by digestion Effect

Inactive Publication Date: 2012-07-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these treatment methods often require the addition of certain substances, and will produce certain procedures of pollution and consume some energy

Method used

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  • Method for treating sludge through refluxing of acidified fermentation liquor and application of method
  • Method for treating sludge through refluxing of acidified fermentation liquor and application of method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The solid content of the sludge in the pretreatment tank is 2.6%, the reflux ratio of the fermentation broth is 65%, and the sludge is stirred to make it evenly mixed. The pretreatment time was 18h, and the TCOD in the sludge liquid phase increased by 1564mg / L after pretreatment. The sludge after acidification pretreatment enters the hydrolysis acidification tank through the sludge pump, the hydraulic retention time is 48h, and the pH value of the fermentation broth drops to 4.73. The sludge after hydrolysis and acidification enters the methanation pool through the sludge pump, the hydraulic retention time is 150h, the methane gas production is 334.2ml / g VS, and the gas production is increased by 46.2%.

Embodiment 2

[0018] The solid content of the sludge in the pretreatment tank is 2.9%, the reflux ratio of the fermentation broth is 80%, and the sludge is stirred to make it evenly mixed. The pretreatment time was 40h, and the TCOD in the sludge liquid phase increased by 2234mg / L after pretreatment. The sludge after acidification pretreatment enters the hydrolysis acidification tank through the sludge pump, the hydraulic retention time is 20h, and the pH value of the fermentation broth drops to 3.96. The hydrolyzed and acidified sludge enters the methanation tank through the sludge pump, the hydraulic retention time is 190h, the methane gas production is 363.4ml / g VS, and the gas production is increased by 58.9%.

Embodiment 3

[0020] The solid content of the sludge in the pretreatment tank is 3.5%, the reflux ratio of the fermentation broth is 96%, and the sludge is stirred to make it evenly mixed. The pretreatment time was 72h, and the TCOD in the sludge liquid phase increased by 2765mg / L after pretreatment. The sludge after acidification pretreatment enters the hydrolysis acidification tank through the sludge pump, the hydraulic retention time is 75h, and the pH value of the fermentation broth drops to 2.36. The hydrolyzed and acidified sludge enters the methanation tank through the sludge pump, the hydraulic retention time is 220h, the methane gas production is 403.8ml / g VS, and the gas production is increased by 76.6%.

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Abstract

The invention discloses a method for treating sludge through the refluxing of acidified fermentation liquor and application of the method. The method comprises the following steps of: performing hydrolytic acidification on the sludge, refluxing the acidified fermentation liquor of the sludge, performing acidification pretreatment on the sludge, and performing hydrolytic acidification fermentation on the pretreated sludge and producing methane by using a product. The sludge is subjected to acidification pretreatment by using the fermentation liquor of the sludge, so that the time required by anaerobic digestion is shortened, the gas yield is improved, and the operating cost is reduced.

Description

technical field [0001] The invention belongs to the field of sludge treatment and disposal, and more specifically, mainly relates to a method for pretreating sludge by refluxing sludge acidification fermentation liquid. Background technique [0002] Sewage plant sludge needs to be stabilized before landfilling. Anaerobic digestion is an effective method, and anaerobic digestion has attracted more and more attention because of its ability to generate energy. Anaerobic digestion can achieve the purpose of sludge reduction and resource utilization, but the anaerobic digestion process of excess sludge is a slow and difficult process, mainly because the cell wall protects cells from osmotic lysis, which hinders the digestion of intracellular substances . Acid pretreatment is an effective method to promote anaerobic digestion, mainly to crack the cell wall, which is manifested in shortened digestion time and increased gas production. General pretreatment methods include: chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 王芬季民王拓
Owner TIANJIN UNIV
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