Method utilizing sludge anaerobic fermentation to produce fatty acid

A technology of sludge anaerobic fermentation and fatty acid, applied in the field of environmental protection and resource utilization, can solve the problems of high investment and operating costs, application limitations of pretreatment methods, etc., to increase production, improve dissolution efficiency and hydrolysis efficiency, reduce The effect of investment and operating costs

Inactive Publication Date: 2014-10-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of these pretreatment methods is greatly limited due to the high investment and operating costs required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) In a plexiglass reactor with a working volume of 5.0L, the activated sludge discharged from the sewage treatment plant after sewage treatment was naturally settled at 4°C for 24 hours, and the required sludge was obtained after discarding the supernatant liquid A sample, the sludge sample is used as a substrate for anaerobic fermentation to produce short-chain fatty acids;

[0024] (2) Add alkyl glycosides to the plexiglass reactor, the ratio of the added weight to the dry weight of the sludge sample is 0.05:1, fill the plexiglass reactor with nitrogen for 10 minutes to remove the oxygen therein, and seal the plexiglass Reactor for fermentation. Through the combined action of microorganisms in sludge samples and alkyl glycosides, organic matter (mainly polysaccharides and proteins) in sludge samples was converted into short-chain fatty acids. Among them, the fermentation temperature is 25±1°C, the stirring speed is 100rpm / min, the fermentation time (that is, the re...

Embodiment 2

[0026] (1) In a plexiglass reactor with a working volume of 5.0L, the activated sludge discharged from the sewage treatment plant after sewage treatment was naturally settled at 4°C for 24 hours, and the supernatant liquid was discarded to obtain the required sludge sample , using the sludge sample as a substrate for anaerobic fermentation to produce short-chain fatty acids;

[0027] (2) Add alkyl glycosides to the plexiglass reactor, the ratio of the weight added to the dry weight of the sludge sample is 0.10:1, fill the plexiglass reactor with nitrogen for 10 minutes to remove the oxygen therein, and seal the plexiglass Reactor for fermentation. Through the joint action of microorganisms in the sludge sample and alkyl glycosides, the organic matter in the sludge sample is converted into short-chain fatty acids. Wherein, the fermentation temperature is 25±1° C., the stirring speed is 100 rpm / min, the fermentation time is 4 days, and the content of short-chain fatty acids pro...

Embodiment 3

[0029] (1) In a plexiglass reactor with a working volume of 5.0L, the activated sludge discharged from the sewage treatment plant was naturally settled at 4°C for 24 hours, and the required sludge sample was obtained after discarding the supernatant liquid. Sludge samples were used as substrates for the production of short-chain fatty acids by anaerobic fermentation;

[0030] (2) Add alkyl glycosides to the plexiglass reactor, the ratio of the added weight to the dry weight of the sludge sample is 0.20:1, fill the plexiglass reactor with nitrogen for 10 minutes to remove the oxygen therein, and seal the plexiglass Reactor for fermentation. Through the joint action of microorganisms in the sludge sample and alkyl glycosides, the organic matter in the sludge sample is converted into short-chain fatty acids. Wherein, the fermentation temperature is 25±1° C., the stirring speed is 100 rpm / min, the fermentation time is 4 days, and the content of short-chain fatty acids produced is...

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Abstract

The invention provides a method utilizing sludge anaerobic fermentation to produce fatty acid. The method comprises the following steps: taking sludge obtained from sewage treatment as a raw material; removing the supernatant after natural settlement to obtain a sludge sample, mixing the sludge sample and alkyl glycoside serving as a surfactant, and fermenting the mixture in the anaerobic environment to produce the fatty acid. The method can prevent the sludge sample from producing methane and improve the organic acid production capability of the sludge sample; the obtained organic acid can be continually applied in the sewage treatment process to improve the effect in removing nitrogen and phosphorus from sewage, so that reduction, harmlessness and recycling of sludge treatment can be realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and relates to a production method of fatty acid. Background technique [0002] As one of the important processes of sewage treatment adopted by urban sewage treatment plants, the biological treatment method mainly uses the microorganisms existing in the sewage treatment system to degrade the organic pollutants in the sewage, so as to remove the suspended or soluble and biological pollutants. Degraded organic matter, so as to meet the requirements of water purification. Biological treatment has been widely used because of its high treatment efficiency and low operating cost. However, although this sewage biological treatment process removes some organic matter in sewage, it also produces a large amount of sludge. By the end of 2013, my country's sludge production had reached 30 million tons (calculated at a moisture content of 80%). Sludge contains a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/64
Inventor 冯雷雨罗景阳孙寒刘鹏陈银广
Owner TONGJI UNIV
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