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Method for improving short-chain fatty acid produced by excess sludge through hot alkali combined pretreatment

A short-chain fatty acid and excess sludge technology, applied in the direction of fermentation, can solve the problem of low efficiency of short-chain fatty acid production from excess sludge, reduce resource utilization, improve hydrolysis rate, and realize the effect of sludge

Inactive Publication Date: 2013-06-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that the efficiency of producing short-chain fatty acids from excess sludge is not high, and provides a method for significantly improving the production of short-chain fatty acids from sludge by combining thermal alkali pretreatment with excess sludge

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add 16 liters of excess sludge to four identical 6-liter reactors (the reactor is made of plexiglass, with an inner diameter of 150mm and a height of 350mm, and is cylindrical). The temperature of thermal pretreatment is 60-120°C, and the time 13-17min. The residence time of the sludge in the reactor is 1-2 days, and the anaerobic fermentation temperature is 28-32°C. The optimal conditions for thermal pretreatment of sludge were measured at 98-102°C, and the production of short-chain fatty acids was 268.6 mg per liter (calculated by chemical oxygen demand).

Embodiment 2

[0027] Add 16 liters of excess sludge on average to four identical 6-liter reactors (the reactor is made of plexiglass, with an inner diameter of 150mm and a height of 350mm, and is cylindrical), the temperature of thermal pretreatment is 98-102°C, and the time is respectively 15-60min. The residence time of the sludge in the reactor is 1-2 days, and the anaerobic fermentation temperature is 28-32°C. The optimal conditions for thermal pretreatment of sludge are 98-102°C, time 28-32min, and the production of short-chain fatty acids is 358.2 mg per liter (based on chemical oxygen demand).

Embodiment 3

[0029] Add 4 liters of excess sludge into a 6-liter reactor (the reactor is made of plexiglass, with an inner diameter of 150mm and a height of 350mm, in a cylindrical shape), the temperature of thermal pretreatment is 98-102°C, and the time is 28-32min . The initial pH value of the sludge is adjusted to 7.5-8.5, the residence time of the sludge in the reactor is 1-2 days, and the anaerobic fermentation temperature is 28-32°C. The production of short-chain fatty acids was measured at 897.3 mg / L (calculated as COD).

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Abstract

The invention belongs to the technical field of environmental protection, and relates to a method for improving short-chain fatty acid produced by excess sludge through hot alkali combined pretreatment. According to the method, the excess sludge in a sewage treatment plant serves as raw material, through hot pretreatment, controlling of initial alkaline power of hydrogen (PH) value conditions and the functions of microorganism is conducted, not only are non-aqueous resolvable organic matters in the sludge promoted to be dissolved and are the non-aqueous resolvable organic matters hydrolyzed to be converted to resolvable organic matters, but also the resolvable organic matters such as protein and polysaccharide are fully converted into the short-chain fatty acid, and pollution of the sludge to the environment is reduced. The temperature of the hot pretreatment is 60-120 DEG C, the time of the hot pretreatment is 15-60min, the initial PH value range of the functions of the microorganism is 8-12, the standing time of the sludge in a reactor is 1-12 days, and the temperature is 30-40 DEG C.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for improving the production of short-chain fatty acids in excess sludge through thermal alkali combined pretreatment. Background technique [0002] Activated sludge method is the most widely used sewage biological treatment method at this stage, but it will produce a large amount of residual sludge while purifying sewage. The excess sludge produced by urban sewage treatment plants contains more microorganisms, suspended solids, colloids, nitrogen, phosphorus and other substances. If it is not properly treated and disposed of, it will cause secondary pollution to the environment. Since the excess sludge contains a large amount of organic matter, the use of sludge anaerobic fermentation to produce biogas can not only recycle the organic matter, but also effectively solve the problem of excessive excess sludge produced by sewage treatment plants. The methan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
Inventor 张栋高鹏贾舒婷董滨戴晓虎
Owner TONGJI UNIV
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