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Method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS)

A technology of potassium hydrogen persulfate compound salt and excess sludge, which is applied in the field of short-chain fatty acid production, can solve the problems of serious secondary pollution, large energy consumption, and complicated process control, achieve strong oxidation capacity, and increase the rate of acid production , the effect of reducing environmental pollution

Inactive Publication Date: 2018-08-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have problems such as large energy consumption, serious secondary pollution, and complicated process control, which inhibit the anaerobic fermentation of sludge. Research Hotspots

Method used

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  • Method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS)
  • Method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS)
  • Method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS)

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) In a plexiglass reactor with a working volume of 5.0L, the remaining sludge discharged from the sewage treatment plant was naturally precipitated at 4°C for 24 hours, and the supernatant was discarded and concentrated to obtain the required sludge sample. Sludge samples were used as substrates for the production of short-chain fatty acids by anaerobic fermentation;

[0025] (2) Add 0.09g / gVSS potassium monopersulfate compound salt (PMS) to the plexiglass reactor, first stir rapidly at 300rpm for 5min with a magnetic stirrer, and then stir at 150rpm for 90min to fully mix the agent with the sludge. The plexiglass reactor was filled with nitrogen for 1.5min to remove the oxygen therein, and after sealing the plexiglass reactor, put it into a shaker for anaerobic fermentation. The organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids through the joint action of microorganisms in the sludge sample and potassi...

Embodiment 2

[0027] (1) In a plexiglass reactor with a working volume of 5.0L, the remaining sludge discharged from the sewage treatment plant was naturally precipitated at 4°C for 24 hours, and the supernatant was discarded and concentrated to obtain the required sludge sample. Sludge samples were used as substrates for the production of short-chain fatty acids by anaerobic fermentation.

[0028] (2) Add 0.09g / gVSS potassium monopersulfate compound salt (PMS) to the plexiglass reactor, first stir rapidly at 300rpm for 5min with a magnetic stirrer, and then stir at 150rpm for 90min to fully mix the agent with the sludge. The plexiglass reactor was filled with nitrogen for 1.5min to remove the oxygen therein, and after sealing the plexiglass reactor, put it into a shaker for anaerobic fermentation. The organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids through the joint action of microorganisms in the sludge sample and potassi...

Embodiment 3

[0030] (1) In a plexiglass reactor with a working volume of 5.0L, the remaining sludge discharged from the sewage treatment plant was naturally precipitated at 4°C for 24 hours, and the supernatant was discarded and concentrated to obtain the required sludge sample. Sludge samples were used as substrates for the production of short-chain fatty acids by anaerobic fermentation.

[0031] (2) Add 0.12g / gVSS potassium monopersulfate compound salt (PMS) to the plexiglass reactor, first stir rapidly at 300rpm for 5min with a magnetic stirrer, and then stir at 150rpm for 90min to fully mix the agent with the sludge. The plexiglass reactor was filled with nitrogen for 1.5min to remove the oxygen therein, and after sealing the plexiglass reactor, put it into a shaker for anaerobic fermentation. The organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids through the joint action of microorganisms in the sludge sample and potassi...

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Abstract

The invention relates to a method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS). The method specifically comprises the following steps: (1) treating residual active sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant as a fermentation raw material, and naturally settling to remove liquid supernatant to concentrate and treat to obtain a sludge sample; (2) mixing and pre-treating the sludge sample with potassium peroxymonosulfate sulfate compound salt (PMS), and fermenting under an anaerobic environment to generate fatty acid. After residual sludge is subjected to PMS pretreatment, dissolving of organic substances in sludge is quickened, and activity of acid-consuming microorganisms such as methanogenic bacteria is further inhibited sufficiently, and therefore, the acid yield is greatly increased, and sludge anaerobic fermentation time is shortened; and moreover, the method provided by the invention is simple in operation, and has important environment-friendly ecological significance for reducing, recycling and stabilizing sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and sludge treatment and resource utilization, and in particular relates to a method for producing short-chain fatty acids by anaerobic fermentation of sludge pretreated with potassium monopersulfate compound salt (PMS). technical background [0002] With the increase of urban sewage treatment plants and stricter discharge regulations, a large amount of excess sludge is generated. However, due to the high cost and technical challenges of sludge treatment, only 35% of sludge can be reasonably and safely disposed of in sludge treatment. Sludge contains a large amount of toxic substances such as odorous substances, heavy metals, pathogens, etc. If it is not handled properly, it will cause serious pollution to the environment. Therefore, how to properly treat and dispose of sludge is an urgent problem to be solved. [0003] Anaerobic fermentation of sludge to produce fatty acids is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/54C12P7/52C12P7/40
CPCC12P7/40C12P7/52C12P7/54
Inventor 王冬波杨静楠刘旭冉徐秋翔伍艳馨王玉芬
Owner HUNAN UNIV
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