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Method for improving yield and purity of short-chain fatty acid in residual sludge and waste oil co-fermentation system

A technology for short-chain fatty acids and excess sludge, applied in fermentation, biological sludge treatment, etc., can solve the problems of SCFA production inhibition and LCFA anaerobic degradation difficult to carry out, to improve yield and purity, improve acid production efficiency, significantly Effect of carbon offset effect

Pending Publication Date: 2021-11-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although LCFA can be converted into SCFA through β-oxidation, there is a lack of corresponding functional flora in the alkaline fermentation system, so the anaerobic degradation of LCFA is difficult, and the production of SCFA is severely inhibited.

Method used

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  • Method for improving yield and purity of short-chain fatty acid in residual sludge and waste oil co-fermentation system
  • Method for improving yield and purity of short-chain fatty acid in residual sludge and waste oil co-fermentation system
  • Method for improving yield and purity of short-chain fatty acid in residual sludge and waste oil co-fermentation system

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Embodiment 1

[0033] The embodiment of the present invention provides a method for improving the output and purity of short-chain fatty acids in the co-fermentation system of excess sludge and waste oil, which specifically includes the following steps:

[0034] S1. Concentrate the excess sludge from a sewage plant to 9000mg / L (VSS), then mix the concentrated excess sludge and waste oil in a reaction vessel with an effective volume of 500mL to obtain a fermentation substrate. The mass ratio of C and N elements in the substance is 105:5;

[0035] S2. Sodium sulfate is added to the fermentation substrate obtained in step S1 to obtain a primary modulation fermentation substrate, and the mass ratio of C and S elements in the primary modulation fermentation substrate is 9:1;

[0036] S3, adding granular activated carbon to the primary modulation fermentation substrate obtained in step S2, to obtain the target modulation fermentation substrate;

[0037] Wherein, the mass ratio of the dosage of gr...

Embodiment 2

[0041] The method for improving the output and purity of short-chain fatty acids in the co-fermentation system of excess sludge and waste oil provided by the embodiments of the present invention specifically includes the following steps:

[0042] S1. Concentrate the excess sludge from a sewage plant to a VS of 9000mg / L, then mix the concentrated excess sludge and waste oil in a reaction vessel with an effective volume of 500mL to obtain a fermentation substrate. The mass ratio of C and N elements is 100:5;

[0043] S2. Sodium sulfate is added to the fermentation substrate obtained in step S1 to obtain a primary modulation fermentation substrate, and the mass ratio of C and S elements in the primary modulation fermentation substrate is 8:1;

[0044] S3, adding granular activated carbon to the primary modulation fermentation substrate obtained in step S2, to obtain the target modulation fermentation substrate;

[0045] Wherein, the mass ratio of the dosage of granular activated...

Embodiment 3

[0049] The method for improving the production of short-chain fatty acids in the co-fermentation system of excess sludge and waste oil provided by the embodiments of the present invention specifically includes the following steps:

[0050] S1. Concentrate the excess sludge from a sewage plant to a VS of 9000mg / L, then mix the concentrated excess sludge and waste oil in a reaction vessel with an effective volume of 500mL to obtain a fermentation substrate. The mass ratio of C and N elements is 110:5;

[0051] S2. Sodium sulfate is added to the fermentation substrate obtained in step S1 to obtain a primary modulation fermentation substrate, and the mass ratio of C and S elements in the primary modulation fermentation substrate is 10:1;

[0052] S3, adding granular activated carbon to the primary modulation fermentation substrate obtained in step S2, to obtain the target modulation fermentation substrate;

[0053] Wherein, the mass ratio of the dosage of granular activated carbo...

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Abstract

The invention discloses a method for improving yield and purity of short-chain fatty acid in a residual sludge and waste oil co-fermentation system. The method comprises the following steps of: sequentially adding residual sludge and waste oil into a reaction container in proportion in a fermentation device with stable and controllable reaction pH, additionally adding sodium sulfate and granular activated carbon in a specific proportion, and controlling the reaction temperature and pH in the reaction container in the whole fermentation process; and after the fermentation is finished, filtering twice to recover the granular activated carbon and obtain a fermentation liquid rich in short-chain fatty acid. According to the method disclosed by the invention, on the basis of alkaline fermentation, an exogenous electron acceptor (sulfate) is introduced to strengthen the sulfate reductive metabolism process, and then the catabolism of long-chain fatty acid to acetic acid in an anaerobic fermentation system is synergistically strengthened. The method disclosed by the invention can significantly improve the yield and purity of the short-chain fatty acid in the terminal fermentation liquid while relieving the inhibition of the long-chain fatty acid, and can effectively promote the large-scale application of fermentation acid production of waste biomass containing oil.

Description

technical field [0001] The invention belongs to the field of waste biomass treatment and resource utilization, and specifically relates to a method for increasing the output and purity of short-chain fatty acids in a co-fermentation system of excess sludge and waste oil. Background technique [0002] The biological treatment unit of sewage treatment facilities usually discharges a large amount of residual sludge. If this part of sludge is not properly disposed of, it may cause human and animal diseases, and there is a huge environmental risk. Traditional treatment and disposal technologies have high costs and low returns. [0003] The technical practice of fermenting and producing short-chain fatty acids (SCFA) using excess sludge as a substrate has attracted attention in recent years. SCFA has a large market demand and has a wide range of uses in environmental protection, chemical and other fields: 1) as an external carbon source to improve the efficiency of nitrogen and p...

Claims

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Application Information

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IPC IPC(8): C12P7/54C12P7/52C12P7/40C02F11/04
CPCC12P7/54C12P7/52C12P7/40C02F11/04Y02W30/74
Inventor 黄龙赵刘义宋亚丽许颖
Owner ZHENGZHOU UNIV
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