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Method for enhancing electron transfer capability of humic acid to promote anaerobic fermentation and acid production of sludge

A sludge anaerobic fermentation and electron transfer technology, applied in chemical instruments and methods, fermentation, sludge treatment, etc., can solve the problems of low yield of volatile fatty acids, low conversion efficiency of organic matter, etc., achieve enhanced effect and improve electron transfer Efficiency, the effect of improving electron transfer ability

Active Publication Date: 2021-05-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is the low conversion efficiency of organic matter in the anaerobic digestion process of excess sludge and the low yield of volatile fatty acids in the acid production stage

Method used

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  • Method for enhancing electron transfer capability of humic acid to promote anaerobic fermentation and acid production of sludge
  • Method for enhancing electron transfer capability of humic acid to promote anaerobic fermentation and acid production of sludge
  • Method for enhancing electron transfer capability of humic acid to promote anaerobic fermentation and acid production of sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 Humic acid redox ability changes

[0042] First, the municipal sludge is adjusted to a water content of 90%, thermally hydrolyzed at a temperature of 180°C for 30 minutes, the organic matter in the sludge is released into the liquid phase, and the solid phase in the thermal hydrolyzate is removed by solid-liquid separation Residue, obtain sludge hydrolyzate; The humic acid concentration of sludge hydrolyzate is 1.0g / L, the sludge hydrolyzate is adjusted to pH neutrality; Then, according to the mass ratio of humic acid and Pd-C catalyst is 1 : 1, add Pd-C catalyst (100% recoverable). Transfer the hydrolyzate (1000ml) together with the Pd-C catalyst to a serum bottle and seal it, then expose to N 2After 20 minutes, empty the oxygen in the serum bottle to ensure an anaerobic environment. Fill 30, 60, 90, 120, 150, 180, 210, 240, 300mLH into the aerated serum bottle respectively 2 , and placed in a shaker at 37°C for 24 hours.

[0043] Will go through Pd-C / ...

Embodiment 2

[0049] First, the municipal sludge is adjusted to a water content of 92%, thermally hydrolyzed at a temperature of 185°C for 35 minutes, the organic matter in the sludge is released into the liquid phase, and the solid phase in the thermal hydrolyzate is removed by solid-liquid separation Residue, obtain sludge hydrolyzate; The humic acid concentration of sludge hydrolyzate is 1.0g / L, sludge hydrolyzate is adjusted to pH=7; Then, be 1 according to the mass ratio of humic acid and Pd-C catalyst : 1, add Pd-C catalyst (100% recoverable). Transfer the humic acid and Pd-C catalyst together into a serum bottle and seal it, then expose to N 2 After 20 minutes, empty the oxygen in the serum bottle to ensure an anaerobic environment. Fill 240mLH into the serum bottle after aeration respectively 2 , and placed in a shaker at 37°C for 30 hours.

[0050] Will go through Pd-C / H 2 Sludge hydrolyzate after catalytic reduction system reaction and without Pd-C / H 2 The sludge hydrolyzate ...

Embodiment 3

[0053] First, the municipal sludge is adjusted to a water content of 92%, thermally hydrolyzed at a temperature of 185°C for 35 minutes, the organic matter in the sludge is released into the liquid phase, and the solid phase in the thermal hydrolyzate is removed by solid-liquid separation Residue, obtain sludge hydrolyzate; The humic acid concentration of sludge hydrolyzate is 1.0g / L, sludge hydrolyzate is adjusted to pH=7; Then, be 1 according to the mass ratio of humic acid and Pd-C catalyst : 1, add Pd-C catalyst (100% recoverable). Transfer the humic acid and Pd-C catalyst together into a serum bottle and seal it, then expose to N 2 After 20 minutes, empty the oxygen in the serum bottle to ensure an anaerobic environment. Fill 270mLH into the serum bottle after aeration respectively 2 , and placed in a shaker at 37°C for 30 hours.

[0054] Will go through Pd-C / H 2 Sludge hydrolyzate after catalytic reduction system reaction and without Pd-C / H 2 The sludge hydrolyzate ...

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Abstract

The invention discloses a method for enhancing the electron transfer capacity of humic acid to promote anaerobic fermentation and acid production of sludge, and belongs to the field of sludge treatment. Humic acid in a sludge hydrolysate is subjected to catalytic reduction through Pd-C / H2, so that the electron transfer capacity of the humic acid is enhanced, the function of the humic acid as an electron intermediate or an anaerobic respiration electron acceptor in a sludge anaerobic fermentation system is enhanced, and by improving electron transfer between a sludge substrate and functional microorganisms, the conversion rate of sludge organic matter is improved. The modified humic acid can increase the yield of volatile fatty acid in the anaerobic fermentation process by 30-50%. According to the method, 100% of the Pd-C catalyst can be recycled, the cost is low, the efficiency is high, the method is a novel method and thought for improving the yield of volatile fatty acid in the anaerobic fermentation process of the sludge, sludge reduction and resource utilization are integrated, and the method has high application value.

Description

technical field [0001] The invention relates to a method for enhancing the electron transfer ability of humic acid and promoting acid production by anaerobic fermentation of sludge, belonging to the field of sludge treatment. Background technique [0002] With the development of the economy and the acceleration of urbanization, the scale and treatment capacity of municipal sewage treatment plants have also increased. As the most mature biological method at present, the activated sludge method is widely used in municipal sewage treatment. However, as a by-product of the biological treatment process, the amount of residual sludge in sewage treatment plants is increasing year by year. It is estimated that in 2020, my country's surplus sludge production will exceed 60 million tons (water content 80%), and the cost of sludge treatment and disposal accounts for about 50%-60% of the operating costs of sewage treatment plants, becoming a serious burden on sewage plants . [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F9/14C12P7/40C02F11/127C02F101/30
CPCC02F11/10C02F9/00C12P7/40C02F11/127C02F2101/30C02F1/66C02F1/72C02F3/28C02F3/286Y02P20/584
Inventor 刘和刘宏波赵成符波郑志永崔敏华张衍
Owner JIANGNAN UNIV
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