城市污泥生物沥浸法和化学法调理的效果比较——对污泥理化性质及其深度脱水性能的影响研究

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Abstract Three widely used conditioning methods, including bioleaching (BC), Fenton oxidation (FC), and chemical addition of lime/FeCl₃/PAM (LC), were investigated to determine their effects on sludge dewaterability and physicochemical properties. The results showed that the BC, FC, and LC conditioning methods significantly improved sludge dewatering performance, as exhibiting that specific resistance to filtration (SRF) of already-conditioned sludge by BC, FC and LC only were 0.43%~6.12% of that by conventional PAM addition treatment (CC). Furthermore, compared to chemical treatments (FC and LC), relatively high quantities of plant nutrients (56.9% of organic matter, 4.66% of total nitrogen, 0.47% of water soluble nitrogen, 1.80% of mineralized nitrogen, and 1.60% of total phosphorus) were retained in the dewatered sludge of bioleaching treatment. Meanwhile, after bioleaching treatment, 18.7% of Cr, 50.0% of Mn, 48.7% of Ni and 72.9% of Zn were removed from sludge, respectively. Flow cytometry was further used to examine the variation of sludge cell apoptosis before and after the three conditioning methods. It was found that dosing chemical conditioners (FC and LC) lead to the obvious lysis of the sludge cells and accordingly a large amount of internal water and intracellular substances within the sludge flocs were released, which may be responsible for their increased plant nutrients release and improved sludge dewaterability. The results suggested that bioleaching treatment exhibited excellent performance in improving sludge dewatering and heavy metal removal and maintaining sludge nutrients, therefore it's promising conditioning approach for sludge disposal.

Key words： sewage sludge conditioning dewaterability bioleaching chemical conditioners physicochemical properties

Received: 02 August 2018

PACS:

X703

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	Articles by authors
	HE Zu-dao
	WANG Dian-zhan
	YAN Cheng
	FANG Di
	ZHENG Guan-yu
	ZHANG Wei-hua
	ZHOU Li-xiang

Cite this article:

HE Zu-dao,WANG Dian-zhan,YAN Cheng等. Effects of bioleaching and chemical conditioning on sludge dewaterability and physicochemical properties[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1019-1025.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1019

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