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Method for improving production of methane from surplus sludge of wastewater treatment plant

A technology for excess sludge and methane production, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane efficiency, reduce pollution, increase the amount of fatty acids and methane production, and fully recover and reuse.

Inactive Publication Date: 2013-07-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of low methane production efficiency from excess sludge, and provides a method for significantly promoting methane production from excess sludge in sewage plants by adding perennial ryegrass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 7:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, and the concentration of short-chain fatty acids is 50g-COD / kg-TS after fermentation for 11-13 days.

[0025] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 1.6L-CH 4 .

Embodiment 2

[0027] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 10:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, the fermentation is 11-13 days, and the concentration of short-chain fatty acids is 100g-COD / kg-TS.

[0028] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 1.8L-CH 4 .

Embodiment 3

[0030] (1) Add 1kg of residual sludge from the sewage plant into a 2L reactor (made of glass fiber reinforced plastics, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape), and add ryegrass. The sludge and ryegrass are mixed according to the carbon and nitrogen The ratio is 12:1, fully mixed, fermented and hydrolyzed to produce acid; the fermentation temperature is 33-37°C, the pH value is 4.5-5.5, the fermentation is 11-13 days, and the concentration of short-chain fatty acids is 150g-COD / kg-TS.

[0031] (2) Control the pH to 6.5-7.5 and the temperature to 33-37°C. The above mixture undergoes 19-21 days of anaerobic fermentation to produce methane, and the methane output is 2.5L-CH 4 .

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Abstract

The invention belongs to the technical field of environmental protection and relates to a method for improving production of methane from surplus sludge of a wastewater treatment plant. The method comprises the following steps of: (1) thoroughly mixing sludge with ryegrass for fermentation, hydrolysis and acid production; and (2) performing anaerobic fermentation on the mixture obtained in the step (1) to generate methane. The method for prompting the production of methane from surplus sludge of the wastewater treatment plant with energy grass is capable of improving the yield of short chain fatty acids and the yield of methane from sludge at the same time, and also capable of recovering and reutilizing organic matters in the sludge more thoroughly; and pollution of sludge on the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for improving methane production from residual sludge in a sewage plant. Background technique [0002] The methanogenic process of anaerobic fermentation of organic solids can be divided into four stages, namely dissolution stage, hydrolysis stage, acid production stage and methanation stage. Under normal conditions, the dissolution and hydrolysis rate of sludge is slow, which is the rate-limiting step in the biodegradation process of organic matter (for example, literature Waste Manage.2012, 32, 542-549; Bioresour.Technol.2012, 103, 415-424; 2011, 102, 10849-10854). Therefore, in the process of fermentation acid production, if the dissolution and hydrolysis rate of sludge can be increased, not only can the hydraulic retention time of the system be shortened, the removal rate of organic matter can be improved, but also more soluble fermentation can be pro...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 张栋赵建夫王学江王荣昌吴家正夏四清
Owner TONGJI UNIV
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