鼠李糖脂-热对污泥厌氧发酵中脱水性能的影响

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Abstract To explore the effect of rhamnolipid and low-temperature thermolysis on the variation of sludge dewaterability, capillary absorption time (CST) was used to quantify the alteration while particle size distribution, the content and fluorescent property of the dissolved organic matter were analyzed to understand relevant mechanism. The results showed that the dewaterability of the sludge became worse after pretreatment and anaerobic fermentation. In comparison, thermolysis and that combined with rhamnolipid could improve the dewaterability of the sludge after anaerobic fermentation. Decreased particle size contributed to worse dewaterability of the pretreated sludge, but increased particle size after fermentation presented no obvious effect on the improvement of sludge dewaterability. Dissolution of organic matter (SCOD), soluble carbohydrate (SC) and soluble protein (SP) indicates that the decrease of particle size is due to of sludge cracking. Three dimensional fluorescence with parallel factor analysis (PARAFAC) showed that before and after sludge pretreatment and anaerobic fermentation the dissolved organic matter(DOM) contained humic acid C1 (386nm / 462nm) and C3 (342nm / 438nm), tyrosine protein C2 (278nm / 306nm) and tryptophan protein C4 (290nm / 358nm). The increased content of humic acid is related to the worsened dewaterability of the thermolyzed sludge. The accumulation of tyrosine protein after anaerobic fermentation seems correlate to the adverse change of sludge dewaterability, while the decomposition of humic acid contributes partly to the improvement on the dewaterability of the thermolyzed sludge after fermentation.

Key words： excess sludge rhamnolipid thermolysis anaerobic fermentation dewaterability

Received: 21 April 2021

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X705

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	Articles by authors
	LI Shuai-shuai
	LIU Yu-ling
	SUN Rui-hao
	DOU Chuan-chuan
	ZHU Ni-ping
	ZHAO Peng-he

Cite this article:

LI Shuai-shuai,LIU Yu-ling,SUN Rui-hao等. Effect of rhamnolipid and heat on dewatering performance of sludge in anaerobic fermentation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5747-5754.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5747

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