Method used for increasing sludge anaerobic fermentation production of volatile short-chain fatty acids

A technology for anaerobic fermentation of volatile fatty acids and sludge, which is applied in the fields of environmental protection and resource utilization, and achieves the effects of simple operation, reduced pollution and low cost.

Inactive Publication Date: 2019-04-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the increase of short-chain volatile fatty acids by calcium peroxide combined with free ammonia fermentation has not been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Fermentation substrate: take the remaining sludge (water content 99.3%, PH=6.7) from the sewage treatment plant and put it into a laboratory container, naturally settle for 24 hours at 4°C, and drain the supernatant to obtain Fermentation base.

[0031] (2) Pretreatment: Add the fermented substrate obtained in step (1) to the reactor, then add calcium peroxide and ammonium chloride, and fill the reactor with nitrogen for 10 minutes to drive away oxygen, at a temperature of 25 ± 0.1 Mechanically stir and mix at 100rmp / min at ℃ for 72 hours, and control the calcium peroxide in the anaerobic reactor to 0.02g CaO 2 / g VSS,NH 4 + -N concentration is 68.21mg NH 4 + -N / L, PH control to 9.0, through NH 4 + The concentration of -N, PH and temperature calculate the concentration of free ammonia to be 60mg NH 3 -N / L.

[0032] (3) Anaerobic fermentation: The temperature of the reactor is controlled at 35±1° C. for anaerobic fermentation, and the content of short-chain v...

Embodiment 2

[0034] (1) Fermentation substrate: take the remaining sludge (water content 99.3%, PH=6.7) from the sewage treatment plant and put it into a laboratory container, naturally settle for 24 hours at 4°C, and drain the supernatant to obtain Fermentation base.

[0035] (2) Pretreatment: Add the fermented substrate obtained in step (1) to the reactor, then add calcium peroxide and ammonium chloride, and fill the reactor with nitrogen for 10 minutes to drive away oxygen, at a temperature of 25 ± 0.1 Mechanically stir and mix at 100rmp / min at ℃ for 72 hours, and control the calcium peroxide in the anaerobic reactor to 0.02g CaO 2 / g VSS,NH 4 + -N concentration is 136.41mg NH 4 + -N / L, PH control to 9.0, through NH 4 + The concentration of -N, PH and temperature calculate the concentration of free ammonia to be 120mg NH 3 -N / L.

[0036] (3) Anaerobic fermentation: The temperature of the reactor is controlled at 35±1° C. for anaerobic fermentation, and the content of short-chain...

Embodiment 3

[0038] (1) Fermentation substrate: take the remaining sludge (water content 99.3%, PH=6.7) from the sewage treatment plant and put it into a laboratory container, naturally settle for 24 hours at 4°C, and drain the supernatant to obtain Fermentation base.

[0039] (2) Pretreatment: Add the fermented substrate obtained in step (1) to the reactor, then add calcium peroxide and ammonium chloride, and fill the reactor with nitrogen for 10 minutes to drive away oxygen, at a temperature of 25 ± 0.1 Mechanically stir and mix at 100rmp / min at ℃ for 72 hours, and control the calcium peroxide in the anaerobic reactor to 0.02g CaO 2 / g VSS, NH 4 + -N concentration is 204.61mg NH 4 + -N / L, PH control to 9.0, through NH 4 + The concentration of -N, PH and temperature calculate the concentration of free ammonia to be 180mg NH 3 -N / L.

[0040] (3) Anaerobic fermentation: The temperature of the reactor is controlled at 35±1° C. for anaerobic fermentation, and the content of short-chai...

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Abstract

The invention discloses a method used for increasing sludge anaerobic fermentation production of volatile short-chain fatty acids, and belongs to the technical field of sludge resource recycling, andmore specifically relates to a calcium peroxide (CaO2) combined free ammonia (FA) method used for increasing sludge anaerobic fermentation production of volatile short-chain fatty acids. The method comprises following steps: sludge obtained through removing supernatant of municipal sewage plant residual sludge after natural static precipitation is taken as a fermentation base material, the fermentation base material is uniformly mixed with calcium peroxide (CaO2) and ammonium chloride (NH4Cl), at a certain temperature, pH is adjusted to convert ammonia nitrogen into free ammonia (FA), pre-treatment reaction is carried out for 72h, and at stirring conditions, anaerobic fermentation is carried out continuously, wherein under the calcium peroxide (CaO2) combined free ammonia (FA) pre-treatment effect, hydrolysis rate is increased obviously, acidifying phase is promoted, methanogen activity is inhibited at the same time, and large amount accumulation of volatile short-chain fatty acids canbe realized. The method is capable of increasing the amount of volatile short-chain fatty acids obviously; the produced volatile short-chain fatty acids can be applied in sewage processing; sewage nitrogen and phosphorus removal effect is improved; sludge quantitative reduction, harmlessness treatment, and resource recycling are realized.

Description

technical field [0001] The invention mainly relates to the technical field of environmental protection and resource utilization, in particular to a method for improving the anaerobic fermentation of sludge to produce short-chain volatile fatty acids. technical background [0002] As an important means of biological treatment of urban sewage, biological nitrogen and phosphorus removal process utilizes the metabolism of microorganisms in activated sludge to complete the degradation of organic pollutants to remove suspended or soluble biodegradable organic pollutants. In order to meet the sewage discharge requirements. Due to the advantages of high treatment efficiency and low operating cost of biological treatment technology, the number of sewage biological treatment plants in my country is increasing year by year. However, although the sewage biological treatment process can effectively remove organic pollutants in sewage, it will also produce a large amount of residual slud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
CPCC12P7/40
Inventor 王冬波帅昆徐秋翔段玉莹张丹秦玉格黎一夫何丹丹刘旭冉
Owner HUNAN UNIV
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