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| Occurrence and removal efficiency of microplastics in the upper Yellow River water supply plants |
| MIN Rui1,2, ZHOU Tian-hong1,2, ZHANG Hong-wei1,2, SONG Shang-jian1,2, LIU Xin1,2, ZHANG Guo-zhen1,2 |
1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China |
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Abstract The abundance, physical morphology, and composition of microplastics＞1μm in a water supply plant were investigated in the upper reaches of the Yellow River. The results showed that the abundance of microplastics in the raw water, coagulation and sedimentation, filtration, UV disinfection and terminal effluent were (1964.5±212.5) microplastics/L, (795±136) microplastics/L, (386±21) microplastics/L, (377±20) microplastics/L, and (374.5±13.5) microplastics/L, with an overall removal rate of 80.97%. Microplastics from raw water to terminal effluent were predominantly in the form of fragments of ＜10 μm (89.60%~100%), and their removal efficiency was related to shape and size. 15 different polymer types were identified by laser direct infrared spectrometry and Raman spectroscopy with qualitative analysis. Polyethylene terephthalate, polypropylene, polyethylene, and polymethylmethacrylate were mainly manifested. The basis for the presence of microplastics in urban water supplies and the reference for the removal of microplastics during water supply treatment were provided in the experiment.
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Received: 18 October 2023
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