污水处理厂中微塑料的去除效能与全流程分析——以北京某下沉式三级污水处理厂为例

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Abstract The effluents from wastewater treatment plants (WWTPs) is one of the important pathways for microplastics entering natural environments. This study analysed the occurrence characteristics and removal efficiencies of microplastics in eight processes of an underground tertiary WWTP in Beijing. The results showed that microplastics in this WWTP were mainly in form of fiber, with major compositions of polypropylene, polyester and polyethylene and the primary size ≤500μm. The overall removal efficiency of microplastics in this WWTP was 91.7%, which mainly benefits from interception, filtration and sedimentation units. Among all the processes, the double-deck horizontal sedimentation tank (the secondary sedimentation tank) showed the highest removal efficiency of microplastics, and biochemical treatment processes did not present significant removal efficiency. As a whole, the microplastics showed a migration trend from wastewater to sludge. In the effluent of this WWTP, the microplastic concentration was 1.3n/L with the composition of polyester fiber. The effluent discharge did not increase the microplastic concentrations in surrounding water body, but affected the microplastic compositions in downstream surface water. The results indicate that advanced treatment processes are necessary guarantees to control the pollution risk of microplastics in surrounding water.

Key words： microplastics wastewater treatment plant occurrence characteristics tertiary treatment polyester fiber

Received: 23 July 2020

PACS:

X703.1

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	XING Wei
	LIU Meng-yao
	LI Di
	WEI Fan-qin
	ZUO Jian-e

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XING Wei,LIU Meng-yao,LI Di等. Removal efficiency and whole process analysis of microplastics in a wastewater treatment plant: Taking an underground tertiary wastewater treatment plant in Beijing as an example[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1140-1147.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1140

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