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Method for producing volatile fatty acid through heating and circular anaerobic fermentation of sludge

A technology of sludge anaerobic fermentation and volatile fatty acid, applied in fermentation, biological sludge treatment and other directions, can solve the problems of difficult and efficient acid production, difficult hydrolysis and acidification, low organic matter content, etc., to achieve compact structure and prevent water eutrophication. The effect of high efficiency and high processing efficiency

Inactive Publication Date: 2014-12-10
TONGJI UNIV
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Problems solved by technology

[0005] In view of the low content of organic matter in sludge in my country, the difficulty of hydrolysis and acidification, and the difficulty of efficient acid production, the purpose of the present invention is to provide a method for efficient production of volatile fatty acids by anaerobic fermentation of heated circulating sludge

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  • Method for producing volatile fatty acid through heating and circular anaerobic fermentation of sludge

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Effect test

Embodiment 1

[0024] figure 1 A flowchart showing the method for producing volatile fatty acids by anaerobic fermentation of heated circulating sludge of the present invention.

[0025] Take dewatered sludge (water content 79.23%) and thickened sludge (water content 98.12%) from a sewage treatment plant in a certain place to make mixed sludge with water content 98.0% in the sludge blending tank. At this time, its volatile The ratio VS / TS of organic solid concentration to total solid concentration is 65.2%. Pump 10.0L (the corresponding sludge residence time is 3d) into the anaerobic fermentation chamber every day through the sludge pump, wherein the total effective volume of the anaerobic fermentation chamber is 30L, and the pH of the anaerobic fermentation chamber is controlled at 9.0 by adding NaOH ~11.0, and control the temperature at 20°C and the stirring speed at 50rpm. And a bypass is set up on the side of the fermentation chamber to discharge 3L of material per day (reflux ratio is...

Embodiment 2

[0030] Take dewatered sludge (water content 80.31%) and thickened sludge (water content 98.03%) from a sewage treatment plant in a certain place to make mixed sludge with water content 92.0% in the sludge blending tank. At this time, its volatile The ratio VS / TS of organic solid concentration to total solid concentration is 52.3%. Pump 10.0L (corresponding sludge residence time is 5d) into the anaerobic fermentation chamber every day through the sludge pump, wherein the total effective volume of the anaerobic fermentation chamber is 50L, and the pH of the anaerobic fermentation chamber is controlled at 9.0 by adding quicklime ~11.0, and control the temperature at 36°C and the stirring speed at 100rpm. And a bypass is set on the side of the fermentation chamber to discharge 10 L of material per day (reflux ratio is 20%) to the heating pretreatment device, and then circulate and drop into the anaerobic fermentation chamber after heating at 110 degrees for 30 minutes. At the sam...

Embodiment 3

[0035] Take dewatered sludge (water content 82.11%) and thickened sludge (water content 97.89%) from a sewage treatment plant in a certain place to make mixed sludge with water content 88.0% in the sludge blending tank. At this time, its volatile The ratio VS / TS of organic solid concentration to total solid concentration is 34.3%. Pump 2.5L (corresponding sludge residence time is 8d) into the anaerobic fermentation chamber every day through the sludge pump, wherein the total effective volume of the anaerobic fermentation chamber is 20L, and the pH of the anaerobic fermentation chamber is controlled at 9.0 by adding NaOH ~11.0, and control the temperature at 55°C and the stirring speed at 150rpm. And a bypass is set up on the side of the fermentation chamber to discharge 1 L of material per day (reflux ratio is 5%) to the pretreatment device, and then circulate and drop into the anaerobic fermentation chamber after heating at 100 degrees for 30 minutes. At the same time, 2.5L ...

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Abstract

The invention belongs to the technical field of recycling treatment of sludge and discloses a method for producing volatile fatty acid through heating and circular anaerobic fermentation of sludge. The method comprises the following steps of: preparing mixed sludge from concentrated sludge and dewatered sludge, performing alkaline anaerobic fermentation on the mixed sludge serving as a fed material for acid production, discharging sludge of which the volume is the same as that of the mixed sludge, refluxing the sludge, performing heating pretreatment, circularly performing alkaline anaerobic fermentation, and collecting a mixed liquor with high acid content. According to the method, technologies such as an alkaline adjustment technology, a heating wall-breaking strengthening technology, a circulating reflux technology and the like are integrated, so that the combination of a physicochemical enhanced treatment technology and a microbiological treatment technology is realized, the high-efficiency utilization of organic substrates and the high-efficiency production of the volatile fatty acid are truly realized, and the operational stability of the whole system is improved.

Description

technical field [0001] The invention belongs to the technical field of sludge resource treatment, and relates to a method for producing volatile fatty acids by anaerobic fermentation of heated circulating sludge. Background technique [0002] With the enhancement of people's awareness of environmental protection and the improvement of environmental protection requirements, nitrogen and phosphorus removal are usually required in the process of sewage treatment. However, in the process of microbial removal of nutrients such as nitrogen and phosphorus, they need a large amount of dissolved organic compounds as carbon sources, such as easily biodegradable organic compounds (such as methanol, acetic acid, etc.) are conducive to the denitrification process, and short-chain fatty acids (including acetic acid, propionic acid, etc.) are beneficial to the enhanced biological phosphorus removal by phosphorus accumulating bacteria. However, in most cases, the short-chain fatty acids in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40C02F11/04
Inventor 严媛媛陈汉龙杨兰琴戴晓虎周琪
Owner TONGJI UNIV
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