碱度类型及浓度对剩余污泥中温厌氧消化的影响

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Abstract

To explore the effects of different alkalinity substances (Na₂CO₃, KHCO₃, NaHCO₃) and concentration ranges (2000, 3000, 4000mg/L (as CaCO₃)) on the middle-temperature anaerobic digestion system, a static batch semi-continuous stirred tank was used in the experiment. The comprehensive reactor operation and microbial high-throughput sequencing analysis showed that Na₂CO₃ could promote the hydrolysis and acidification process in three different types of alkalinity, while NaHCO₃ was more prominent in gas production and reduction. It indicated that Na₂CO₃ was more likely to promote hydrolysis and acidification in the limiting stage compared to other samples, when the alkalinity of the system was adjusted. Under different concentrations, the hydrolysis capacity was enhanced by increasing the concentration of added basicity, which led to the deterioration of the dehydration performance, while the Volatile Fatty Acids changed little, and the excess basicity will reduce the gas production and reduction of the system.

Key words： waste activated sludge alkalinity moderate-temperature anaerobic digestion hydrolysis acidizing bacteria methanogens

Received: 26 September 2018

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X703

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	Articles by authors
	ZHAO Ming-ming
	LI Xi-yao
	LI Lu-kai
	PENG Yong-zhen
	ZHANG Qiong

Cite this article:

ZHAO Ming-ming,LI Xi-yao,LI Lu-kai等. Effects of alkalinity type and concentration on mesophilic anaerobic digestion of excess sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1954-1960.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/1954

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