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Method for producing volatile fatty acid by using sludge as substrate

A volatile fatty acid and substrate technology, applied in the field of fatty acids, can solve problems such as long production cycle, achieve the effects of reducing pollution, reducing investment and operating costs, and increasing the speed

Inactive Publication Date: 2010-05-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods can promote sludge hydrolysis to produce acid to a certain extent, but the production cycle is long, and it takes 6-12 days to reach the maximum acid production

Method used

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  • Method for producing volatile fatty acid by using sludge as substrate
  • Method for producing volatile fatty acid by using sludge as substrate
  • Method for producing volatile fatty acid by using sludge as substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Determination of volatile fatty acids: The qualitative and quantitative analysis of various VFAs is carried out by gas chromatography. Before the detection, the samples are first centrifuged at 15,000 rpm for 5 minutes, and then the supernatant is filtered with a 0.45 μm filter membrane. Gas chromatograph (GC9560) analysis conditions: chromatographic column: SE-30 capillary column; carrier gas: nitrogen; pre-column pressure: 0.06MPa; injector: 170°C; column temperature: 140°C; detector temperature: 200°C; Injection volume: 5 μL. The detection conditions of standard samples of volatile fatty acids such as acetic acid, propionic acid, butyric acid and valeric acid are the same as above.

Embodiment 2

[0020] Put 1L MLSS (mixed liquid suspended solids concentration) of 41g / L sludge as substrate sludge into a 1L Erlenmeyer flask, add 12mL of anaerobic sludge with a concentration of 45g / L as inoculum, and then Under magnetic stirring. After 60 hours of reaction, volatile fatty acids with a concentration of 1.08 g / L were obtained. The result is as figure 1 Shown (0. Blank control: no pretreatment).

Embodiment 3

[0022] Add 7g sodium hydroxide to 1L MLSS of 41g / L sludge, and treat it for 30min under the condition of magnetic stirring at room temperature. Use hydrochloric acid solution to adjust the pH value to 7.5, put it as substrate sludge in a 1L conical flask, add 12mL of anaerobic sludge with a concentration of 45g / L as inoculum, and stir magnetically at room temperature. After 48 hours of reaction, volatile fatty acids with a concentration of 2.13 g / L were obtained. The result is as figure 1 Shown (1. Temperature: room temperature, NaOH: 7g / L, time: 30min).

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Abstract

The invention provides a method for producing volatile fatty acid by using sludge as a substrate and relates to a fatty acid. The method comprises the following steps of: using mixed sludge of primary sludge and residual sludge of a sewage treatment plant as a raw material, adding sodium hydroxide, stirring the mixture, naturally cooling to a room temperature after heating, and adjusting a pH value with hydrochloric acid until neutral; and using anaerobic sludge as an inoculum, stirring the anaerobic sludge under an anaerobic condition, and carrying out anaerobic fermentation to obtain the volatile fatty acid. The method produces acid by using the residual sludge of the urban sewage treatment plant, realizes reclamation of the sludge, reduces pollution of organic matters in the sludge to environment at the same time, and is a recycling economic mode of the urban sewage treatment plant. The hydrolysis acidification rate of the sludge is greatly improved and the volatile fatty acid is accumulated in a short time in a pretreatment way. Meanwhile, because of greatly improving the hydrolysis rate of the sludge and shortening anaerobic fermentation time of the sludge, the method has significance for improving and optimizing the conventional sludge treatment systems and reducing investment and running cost.

Description

technical field [0001] The invention relates to a fatty acid, in particular to a method for producing high value-added volatile fatty acids (VFAs) by using pretreated sludge as a substrate. Background technique [0002] Sludge is a by-product of sewage treatment, which is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles and colloids. According to the construction plan of my country's sewage treatment, it is predicted that by 2010, the output of dry sludge will reach about 20,000 tons / day, and the wet sludge with a moisture content of 80% will be about 100,000 tons / day (about 36.65 million tons for the whole year). [0003] The content of organic matter in the sludge is high, and the water content is also high, so anaerobic digestion is easy to occur under anaerobic conditions. Volatile fatty acids (VFAs) produced during sludge anaerobic digestion, such as acetic acid, propionic acid, butyric acid and valeric acid, are ...

Claims

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Application Information

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IPC IPC(8): C12P7/54C12P7/52C12P7/40
Inventor 李清彪孙弘王远鹏何宁刘正贵王海涛孙道华
Owner XIAMEN UNIV
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