Journal
ENVIRONMENTAL POLLUTION
Volume 279, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.116904
Keywords
Polystyrene nanoplastics; Activated sludge; Extracellular polymeric substance; Surface functional groups; Protein secondary structure
Categories
Funding
- National Key Plan for Research and Development of China [2016YFC0401703]
- National Natural Science Foundation of China [51779078]
- National Science Funds for Creative Research Groups of China [51421006]
- Natural Science Foundation of Jiangsu Province of China [BK20171438]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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The study investigated the acute effects of three polystyrene nanoplastics on the extracellular polymeric substance composition of activated sludge. The results showed significant inhibition in EPS and protein production, as well as cellular oxidative stress and cell membrane damage. The influence on EPS and cytotoxicity of activated sludge varied with the surface functional groups of the polystyrene nanoplastics.
Here we investigated the acute effects (12 h exposure) of three polystyrene nanoplastics (PS NPs, including PS, PS-COOH and PS-NH2) on extracellular polymeric substance (EPS) composition of acti-vated sludge. Three PS NPs exhibited the significant inhibition in total EPS and protein (PRO) production. The functional groups involved in the interactions between PS NPs and EPS were C-(C, H), and those between PS-NH2 NPs and EPS were C=O and O-C-O. In addition, the dewaterability of activated sludge were optimized by three PS NPs, especially PS-NH2 NPs. Three PS NPs caused nonnegligible cellular oxidative stress and cell membrane damage in activated sludge (PS NPs exposure concentration: 100 mg/L). Among them, the cell membrane damage caused by PS-NH2 was the most significant. Overall, the degree of influence on EPS and cytotoxicity of activated sludge varies with the surface functional groups of PS NPs. (C) 2021 Elsevier Ltd. All rights reserved.
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