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Occurrence characteristics of microplastics in Nanjing urban wastewater treatment plant |
CHEN Yu1,2, ZHANG Yan3, SU Liang-hu1, ZHAO Xin1, BU Yuan-qin1, LI Hui4, ZHANG Sheng-hu1, LI Jiang2 |
1. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China; 2. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China; 3. School of Environment, Nanjing University, Nanjing 210023, China; 4. Beijing Larkworld Environmental Technology Incorporated Company, Beijing 100045, China |
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Abstract The occurrence characteristic of microplastics in one wastewater treatment plant and its downstream inlet in Nanjing was investigated in this study. The results showed that the microplastics in the influent water had the following characteristics: 71.43% was made of nylon, the dominant color was the black (54.76%), fibres accounted for 38.10%, and the particle size was mainly in the range of 50~500μm (69.05%). The abundance of microplastics in influent water, secondary treated sewage and effluent water of wastewater treatment plant were 4.2n/L, 1.6n/L and 0.9n/L, respectively. The removal efficiency of microplastics in this treatment plant was 78.57%. Despite the low pollution load index (50.99) at the river entrance, the potential ecological risks caused by microplastics released from the waste water treatment plant could not be ignored due to the continuous discharge of effluent. The results could provide reference data for the improvement of design on microplastic removal processes in wastewater treatment plants.
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Received: 16 February 2020
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