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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AI-Extracted 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 p...

Method used

The inventive method first with residual sludge and ryegrass according to different carbon-nitrogen ratios (C/N) 7:1,10:1,12:1,14:1,16:1,18:1,20: 1. 22:1, 24:1, 26:1 mixed, the temperature is 30-40°C, the pH value is 4-7, after 8-16 days of full hydrolysis and acid production stage. In this way, not only the hydrolysis rate of sludge can be significantly increased, and more soluble carbohydrates can be produced, but also the amount of short-chain fatty acids generated from soluble carbohydrates can also be increased, which provides abundant resources for the subsequent anaerobic methanogenesis stage. carbon source.

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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.

Application Domain

Waste based fuelBiological sludge treatment

Technology Topic

ChemistryAcid production +8

Examples

Experimental program(14)

Example Embodiment

[0023] Example 1

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

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

Example Embodiment

[0026] Example 2

[0027] (1) Add 1kg of sludge from the sewage plant to a 2L reactor (made of glass fiber reinforced plastic, working volume of 1.5L, inner diameter of 10cm, height of 26cm, cylindrical shape), and add ryegrass. The sludge and ryegrass are in accordance with carbon and nitrogen The ratio of 10:1 is mixed to fully mix and ferment to produce acid; the fermentation temperature is 33-37°C, the pH 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 anaerobic fermentation for 19-21 days to produce methane, and the methane output is 1.8L-CH 4.

Example Embodiment

[0029] Example 3

[0030] (1) Add 1kg of sludge from the sewage plant to a 2L reactor (made of glass fiber reinforced plastic, working volume of 1.5L, inner diameter of 10cm, height of 26cm, cylindrical shape), and add ryegrass. The sludge and ryegrass are in accordance with carbon and nitrogen The ratio of 12:1 is mixed to fully mix and ferment to produce acid; the fermentation temperature is 33-37°C, the pH 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 anaerobic fermentation to produce methane, and the methane output is 2.5L-CH 4.

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Description & Claims & Application Information

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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.

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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