Microwave-acid pretreatment: A potential process for sludge dewaterability

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	Microwave-acid pretreatment: A potential process for sludge dewaterability
	Liu, Jibao; Wei, Yuansong; Li, Kun; Tong, Juan; Wang, Yawei; Jia, Ruilai
刊名	WATER RESEARCH
	2016-03-01
卷号	90 期号:0 页码:225-234
关键词	Activated sludge Dewaterability Microwave Acid Regression model
英文摘要	Activated sludge is hard to be dewatered due to the highly water bounded in sludge flocs. This study investigated the hybrid treatment of microwave irradiation and acidification on sludge dewaterability as well as its mechanism. Results showed that the combined microwave-acid treatment (T = 100 degrees C, initial pH = 2.5) was effective for improving sludge dewaterability, e.g. capillary suction time (CST) decreased from 37.7 s to 9.2 s, bound water content decreased from 1.96 +/- 0.19 g/g Dry Sludge (DS) to 0.88 +/- 0.24 g/g DS. The treated sludge showed more fluidity and less thixotropy. Both MW heating temperature and pH played important roles in improving sludge dewaterability. Higher temperature was beneficial for sludge disintegration, but the released polymers resulted in highly negative zeta potential and deteriorated sludge dewaterability. The acidification was capable of reducing the negative zeta potential, increasing flocs size and finally improving sludge dewaterability. According to the analysis of molecule weight distribution and 3D-EEM, the fractions of polymers especially protein-like substances at molecule weight of 10(4)-10(5) Da were the key organics related to sludge dewaterability, but not the humic acid-like and fulvic acid-like substances. (C) 2015 Elsevier Ltd. All rights reserved.
收录类别	SCI
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/35758]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Liu, Jibao,Wei, Yuansong,Li, Kun,et al. Microwave-acid pretreatment: A potential process for sludge dewaterability[J]. WATER RESEARCH,2016,90(0):225-234.
APA	Liu, Jibao,Wei, Yuansong,Li, Kun,Tong, Juan,Wang, Yawei,&Jia, Ruilai.(2016).Microwave-acid pretreatment: A potential process for sludge dewaterability.WATER RESEARCH,90(0),225-234.
MLA	Liu, Jibao,et al."Microwave-acid pretreatment: A potential process for sludge dewaterability".WATER RESEARCH 90.0(2016):225-234.