Method for promoting degradation of pollutants in excess sludge and producing fatty acid

A technology of excess sludge and fatty acid, applied in fermentation and other directions, can solve the problems of slow reaction rate and insignificant degradation effect of organic matter, and achieve the effect of promoting dissolution, shortening time and improving acid production rate.

Inactive Publication Date: 2018-10-09
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively stable persulfate, the reaction rate is slow at room temperature, and the degradation effect on organic matter is not obvious

Method used

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  • Method for promoting degradation of pollutants in excess sludge and producing fatty acid
  • Method for promoting degradation of pollutants in excess sludge and producing fatty acid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) In a plexiglass reactor with a working volume of 5.0L, the excess 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 as substrates for anaerobic fermentation to produce short-chain fatty acids;

[0027] (2) Add 0.06g / g VSS K to the plexiglass reactor 2 SO 4 , pretreated for 60 min in a water bath at 80 °C with a shaking intensity of 150 rpm. The plexiglass reactor was fed with nitrogen at a rate of 0.5L / min for 1.5min to remove oxygen therein, and the plexiglass reactor was sealed and placed in a shaker for anaerobic fermentation. Through the temperature and the combined action of microorganisms and potassium persulfate in the sludge sample, the organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids, and the sulfate radicals generated oxidize some of the ...

Embodiment 2

[0029] (1) In a plexiglass reactor with a working volume of 5.0L, the excess 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 as substrates for anaerobic fermentation to produce short-chain fatty acids;

[0030] (2) Add 0.06g / g VSS K to the plexiglass reactor 2 SO 4 , pretreated for 60 min in a water bath at 80 °C with a shaking intensity of 150 rpm. The plexiglass reactor was fed with nitrogen at a rate of 0.5L / min for 1.5min to remove oxygen therein, and the plexiglass reactor was sealed and placed in a shaker for anaerobic fermentation. Through the temperature and the combined action of microorganisms and potassium persulfate in the sludge sample, the organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids, and the sulfate radicals generated oxidize some of the ...

Embodiment 3

[0032] (1) In a plexiglass reactor with a working volume of 5.0L, the excess 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 as substrates for anaerobic fermentation to produce short-chain fatty acids;

[0033] (2) Add 0.09g / g VSS K to the plexiglass reactor 2 SO 4, pretreated for 60 min in a water bath at 80 °C with a shaking intensity of 150 rpm. The plexiglass reactor was fed with nitrogen at a rate of 0.5L / min for 1.5min to remove oxygen therein, and the plexiglass reactor was sealed and placed in a shaker for anaerobic fermentation. Through the temperature and the combined action of microorganisms and potassium persulfate in the sludge sample, the organic matter (mainly polysaccharides and proteins) in the sludge sample is converted into short-chain fatty acids, and the sulfate radicals generated oxidize some of the r...

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Abstract

The invention relates to a method for promoting degradation of pollutants in excess sludge and producing fatty acid. The method comprises the following specific steps: firstly, taking excess activatedsludge generated by a secondary sedimentation tank of an urban sewage treatment plant as a fermentation raw material, naturally settling to remove supernate and carrying out concentrated treatment toobtain a sludge sample; secondly, mixing the sludge sample with potassium persulfate, pretreating a mixture in a water bath with the temperature of 80 DEG C for one hour, and fermenting in an anaerobic envirnoment to produce the fatty acid. After the excess sludge is pretreated, dissolution of organic matters in the sludge is accelerated, and the activity of acid-consuming microbes of methanogenic bacteria and the like is sufficiently inhibited, so that acid yield is greatly improved, and the anaerobic fermentation time of the sludge is shortened; meanwhile, kinds and quantity of the pollutants in the sludge are reduced. The method provided by the invention is simple to operate and has important environment-friendly ecological significance for reduction, recycling and stabilization.

Description

technical field [0001] The invention relates to the fields of environmental protection and sludge treatment and disposal, in particular to a method for promoting the degradation of pollutants in excess sludge while producing short-chain fatty acids. technical background [0002] In the past few decades, with the rapid development of industrialization and urbanization, the amount of municipal sewage and industrial wastewater has increased dramatically around the world. As a cost-effective method, activated sludge process has been widely used in various types of wastewater treatment. However, with the increase in the amount of sewage treatment, the output of excess sludge is increasing, and the sludge contains a lot of odorous substances, heavy metals, pathogens and other toxic substances, which will cause major pollution to the environment if not properly treated. The production of a large amount of excess sludge has become a thorny problem in sewage treatment plants all ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
CPCC12P7/40
Inventor 杨静楠刘旭冉王冬波
Owner HUNAN UNIV
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