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Long-term impacts of polyethylene terephthalate (PET) microplastics in membrane bioreactor by Kaixin Yi; Jinhui Huang; Xue Li; Suzhou Li; Haoliang Pang; Zhexi Liu; Wei Zhang; Si Liu; Chunhua Liu; Wenli Shu is a Environmental Science article available to read on EtoBox.

What is Long-term impacts of polyethylene terephthalate (PET) microplastics in membrane bioreactor about?

Due to the mass production and daily use of plastic products, the potential toxicity of microplastics to the water environment has attracted worldwide attention. In this work, the effect of typical microplastics (PET) on the performance of activated sludge from membrane bioreactors (MBR) was evaluated. The impacts on biological removal efficiency were unconspicuous with continuous dosing of 60 particles/L. However, further investigations revealed that PET particle accumulation caused adverse impacts on settleability and dewaterability. The SVI value increased from 53.3 ml/g MLSS to 69.9 ml/g MLSS and the CST in the PET reactor increased by 22%. Nevertheless, hydrophobicity was reduced by 49.2%. Mechanism studies exposed that the PET microplastics accumulation improved extracellular polymeric substances (EPS) from 116.96 mg/L to 138.70 mg/L and caused cell membrane damage. The abundance and diversity of microbial community reduced in activated sludge in PET reactor compared with control reactor. These phenomena revealed a possible hypothesis that the microplastic particles increased EPS and cytotoxicity of activated sludge. However, the rate of transmembrane pressure (TMP) build-up

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Author

Kaixin Yi; Jinhui Huang; Xue Li; Suzhou Li; Haoliang Pang; Zhexi Liu; Wei Zhang; Si Liu; Chunhua Liu; Wenli Shu

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)