污泥焚烧细颗粒物中重金属赋存形态的研究

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Abstract The sludge samples were obtained from a wastewater treatment plant in Shenyang, Liaoning province, China. The sludge was incinerated in a lab-scale fluidized bed and the fine particulate matter was collected by the bag and electrical low-pressure impactor plus (ELPI+). Effects of incineration temperature, particle size and the addition of CaO on the occurrence characteristics of heavy metals and morphology of fine particulate matter were studied. The entire incineration process of sludge was simulated using the Equilib module of FactSage 7.2. The results showed that as the temperature increases, the changes of residual state were most obvious. The increase of residual state of Cd, Cr, Cu, Pb, and Zn was more than 15%. Among them, the change of Cd was most obvious, and the increase in residue state was as high as 29%. As the increases of particle size, the degree of crushing of minerals and coke particles decreased, and eventually the number of fine particles with larger particle sizes derived from the crushing of minerals and coke were increased and in general, the occurrence form of heavy metals was developing towards a stable trend. CaO could be used as a good binder between the particles, promoting the growth and agglomeration of fine particles during the incineration process. With the addition of CaO, the fine particles were aggregated into a larger spherical particle as a whole.

Key words： sludge fine particulate matter heavy metals occurrence characteristics incineration condition

Received: 11 September 2019

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X705

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	Articles by authors
	FANG Zhen-quan
	MAN Jia-qi
	LIU Fei-fei
	LI Yan-long
	LI Run-dong

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FANG Zhen-quan,MAN Jia-qi,LIU Fei-fei等. Study on the occurrence characteristics of heavy metals in fine particulate matter during sludge incineration[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 3044-3053.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/3044

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