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.
李帅帅, 刘玉玲, 孙瑞浩, 窦川川, 朱妮平, 赵鹏鹤. 鼠李糖脂-热对污泥厌氧发酵中脱水性能的影响[J]. 中国环境科学, 2021, 41(12): 5747-5754.
LI Shuai-shuai, LIU Yu-ling, SUN Rui-hao, DOU Chuan-chuan, ZHU Ni-ping, ZHAO Peng-he. Effect of rhamnolipid and heat on dewatering performance of sludge in anaerobic fermentation. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5747-5754.
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