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Multistage anaerobic digestion strengthened gas production method

An anaerobic digestion and anaerobic reaction device technology, which is applied in the process field of multi-stage anaerobic digestion to enhance gas production, can solve the problem of low degradation rate of organic matter in sludge anaerobic digestion, achieve enhanced sludge stabilization effect, and improve The effect of stable sludge quality and effect

Active Publication Date: 2014-02-05
TONGJI UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to solve the technical problem that the degradation rate of organic matter in sludge anaerobic digestion is not high, the present invention provides a process for multi-stage anaerobic digestion to strengthen gas production

Method used

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  • Multistage anaerobic digestion strengthened gas production method

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Embodiment 1

[0023] (1) Dewatered sludge obtained from Shanghai Anting Wastewater Treatment Plant (solid content 20%, VS / TS 51%, pH 7.6, ammonia nitrogen concentration (TAN) 739 mg L -1 ,) and stored at 4°C. 2 hours before feeding, take 400g of dewatered sludge and store it in an incubator at 37°C;

[0024] (2) When feeding, add 400g of dewatered sludge (the solid content of the feed sludge is 20%) into the 1# anaerobic fermentation device with an effective volume of 6L, and the feed amount is 1 / 15 of the inoculated sludge ; The original 6L material in the fermentation device is anaerobic fermentation sludge, the temperature of the material in the fermentation device is controlled at 35±1°C, the residence time of the material in the fermentation device is 15 days, the material is continuously fed in and out every day, and the stirring device is controlled Start every 20 minutes for 10 minutes and stop for 10 minutes;

[0025] (3) After the anaerobic fermentation is stabilized, the organi...

Embodiment 2

[0031] (1) Dewatered sludge obtained from Shanghai Anting Wastewater Treatment Plant (solid content 20%, VS / TS 51%, pH 7.6, ammonia nitrogen concentration (TAN) 739 mg L -1 ,) and stored at 4°C. 2 hours before feeding, take 375g of dewatered sludge and 125g of deionized water and store them in an incubator at 37°C;

[0032] (2) When feeding, add 375g of dewatered sludge and 125g of deionized water (the solid content of the feed sludge is 15%) into the 1# anaerobic fermentation device with an effective volume of 6L, and the amount of feed is inoculation 1 / 12 of the sludge; the original 6L material in the fermentation device is anaerobic fermentation sludge, the temperature of the material in the fermentation device is controlled at 35±1°C, the residence time of the material in the fermentation device is 12 days, and it is continuously in and out every day material, and control the stirring device to start every 20 minutes for 10 minutes and stop for 10 minutes;

[0033] (3) A...

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Abstract

The invention relates to a multistage anaerobic digestion strengthened gas production method mainly comprising the steps of front-stage anaerobic digestion, high-temperature and high-pressure thermal hydrolysis and back-stage anaerobic digestion. After sludge is subjected to the front-stage anaerobic digestion treatment, easily-degraded organic matters are sufficiently decomposed and converted into marsh gas, the residual part mainly comprises difficultly-biodegraded organic matters and facultative bacteria which adapt to the anaerobic environment and can not be digested and utilized, and the organic matters account for over 50% of the total organic matters in the sludge and restrict the development of anaerobic digestion. The discharged material subjected to the front-stage anaerobic digestion is subjected to the high-temperature and high-pressure thermal hydrolysis treatment to force a cell wall to crack, substances in a cell to be dissolved out and a colloid structure of an extracellular polymer to be broken, so that parts of difficultly-biodegraded organic matters are converted into the easily-degraded organic matters; the sludge subjected to the thermal hydrolysis treatment is added into a back-stage anaerobic digestion system to further realize the degradation and anaerobic gas production of the organic matters. By using the multistage anaerobic digestion strengthened gas production method, the degradation rate and gas production rate of the organic matters in the sludge are radically increased, the quantity and volume of the sludge are reduced, the sludge stabilizing effect is enhanced, and the quality of anaerobic digestion sludge is improved.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a multi-stage anaerobic digestion process for enhancing gas production, so as to improve the degradation rate of sludge anaerobic organic matter and gas production efficiency. Background technique [0002] At present, the amount of sewage sludge in my country is increasing year by year. According to statistics, my country's annual sludge production has reached 30 million tons (according to 80% moisture content), according to forecasts, by 2020 the annual sludge production will exceed 60 million tons. Due to the serious phenomenon of "heavy water and light mud" in the construction of sewage treatment plants in our country, a large amount of sludge has not been treated reasonably and safely. Unstabilized sludge contains easily degradable organic matter, malodorous substances, pathogens, etc., which can easily cause pollutants to diffuse during sludge transportation and disposal,...

Claims

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Application Information

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IPC IPC(8): C02F11/04
Inventor 戴晓虎董滨盖鑫赵玉欣高鹏叶宁罗凡戴翎翎
Owner TONGJI UNIV
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