Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 314, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.115067
Keywords
Microplastics; Sewage treatment; Retention rates; Fungus; Ecological risk
Categories
Funding
- National Natural Science Foundation of China [42067056]
- Foundation for Distinguished Young Talents of Yunnan Province [202101AV070006]
- Research Fund Program of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2020B1212060022]
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This study investigated the abundance, characteristics, and retention of microplastics (MPs) in different sewage treatment plants (STPs), as well as the ecological risks posed by MPs entering the environment. The results showed that a significant portion of MPs can be trapped and transferred into dewatered sludge during the sewage treatment process. The dominant colors of MPs were transparent, black, blue, red, pale brown, green, and gray, with the main species being polypropylene and polyethylene. Furthermore, MPs were found to be absorbed by oyster mushrooms, with fibrous materials widely distributed in their stipes and pileus.
Many microplastics (MPs) were produced in daily life, which would enter sewage treatment plants (STPs) with the wastewater. Although the STPs has a good interception effect on these MPs, there will still be a part of MPs entering the environment with the effluent and sludge treatment, causing a certain ecological risk. This study investigated the abundance, characteristics and retention of MPs in different STPs, as well as the ecological risks caused by MPs entering the environment. The abundance of MPs in influent and effluent was ranged from 2.02 to 2.50 items L-1 and 0.27-0.48 items L-1, respectively. The abundance of MPs in dewatered sludge and sediment of Lake Dianchi was ranged from 3.719-6.949 x 10(3) items (kg Ds)(-1) and 1.84-5.23 x 10(3) items (kg Ds)(-1), respectively. So roughly 80% of the MPs were trapped and transferred into the dewatered sludge. The observed colors of MPs were transparent, black, blue, red, pale brown, green and gray, and their main species were polypropylene (PP) and polyethylene (PE). To further evaluate the ecological risks of MPs, the oyster mushroom was cultivated in a medium supplemented with MPs. It was found that MPs could be absorbed by oyster mushrooms with a 7-11% of absorption rate, the fibers were widely distributed in the stipes and the pileus. This study had theoretical significance for exploring the distribution of MPs in STPs and clarifying the ecological risk posed by MPs in the environment.
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