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Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment

A technology for excess sludge and methane production, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane production efficiency of excess sludge, and achieve the effects of shortening time, increasing acid production rate, and increasing hydrolysis rate.

Active Publication Date: 2014-12-10
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that the methane production efficiency of excess sludge is not high, and provides a method for improving methane production of excess sludge by combined thermal alkali pretreatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10 liters of excess sludge to 10 identical 2-liter reactors on average (the reactor is made of plexiglass, with an inner diameter of 100mm and a height of 260mm, and is cylindrical). 15-60min, adjust the initial pH value to 8-12, the residence time of the sludge in the reactor is 1-12 days, and the temperature is 30-40°C. The best conditions for thermal hydrolysis of sludge are 98-102°C, and the time is 28-32 minutes. The best conditions for the acid production stage are initial pH value 10.5-11.5, and the residence time in the reactor is 5-7 days. At a temperature of 33-37°C, the obtained short-chain fatty acid is 4361.4 mg per liter (based on chemical oxygen demand).

Embodiment 2

[0023] Add 1 liter of excess sludge into a 2 liter reactor, heat pretreatment temperature is 98-102°C, time is 28-32min, the initial pH value of microbial action is 10.5-11.5, anaerobic fermentation is 5-7 days , adjust the pH of the mixture to neutral, add anaerobic granular sludge with a volume percentage of 8%, control the temperature at 28-32°C, ferment for 5-7 days, and produce 0.8 liters of methane.

Embodiment 3

[0025] Add 1 liter of excess sludge into a 2 liter reactor, heat pretreatment temperature is 98-102°C, time is 28-32min, the initial pH value of microbial action is 10.5-11.5, anaerobic fermentation is 5-7 days , adjust the pH of the mixture to neutral, add anaerobic granular sludge with a volume percentage of 10%, control the temperature at 28-32°C, ferment for 5-7 days, and produce 1.2 liters of methane.

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Abstract

The invention belongs to the technical field of environmental protection and relates to a method for improving the methanogenesis of residual sludge by heat and alkali combined pretreatment. According to the method, after the residual sludge is thermally pretreated, the dissolving in water of organic matters such as protein and polysaccharide in the residual sludge can be improved significantly so that abundant water-soluble organic matrixes can be provided for the fermentation of the sludge and the generation of acids; and in addition, after the residual sludge is pretreated under the initial alkaline condition, the dissolving and the dehydrating of the sludge can be promoted further and short chain fatty acids can be produced continuously. Therefore, the residual sludge dehydrating efficiency and the acid generating efficiency can be improved greatly by the combination of thermal pretreatment and the initial alkaline condition so that the yield of methane can be increased to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for improving methane production of excess sludge through thermal alkali combined pretreatment. Background technique [0002] During the sewage treatment process, about 45-50% of the organic matter in the sewage will be converted into primary sludge and residual sludge. These sludges contain a large amount of organic substances and microorganisms and other pollutants, which will easily cause secondary pollution if not treated. In addition, since the cost of sludge treatment and disposal usually accounts for more than 60% of the total operating cost of sewage treatment, the rapid growth of urban surplus sludge will inevitably lead to an increase in sewage treatment costs. Therefore, it is necessary to develop economically effective treatment and disposal technologies for urban sludge It is imperative. The excess sludge contains a large amount of organic s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 张栋高鹏贾舒婷董滨戴晓虎
Owner TONGJI UNIV
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