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Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics

Substantial amounts of extracellular polymeric substances (EPS) are present in sludge from wastewater treatment plants (WWTP), and EPS can significantly affect the fate, bioavailability, and toxicity of microplastics (MPs) that coexist in the effluent, however, the mechanism of action between EPS an...

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Autores principales: Wei, Shuyin, Zeng, Feng, Zhou, Yingyue, Zhao, Jiawei, Wang, Hao, Gao, Rui, Liang, Weiqian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10478482/
https://www.ncbi.nlm.nih.gov/pubmed/37674486
http://dx.doi.org/10.1039/d3ra04027e
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author Wei, Shuyin
Zeng, Feng
Zhou, Yingyue
Zhao, Jiawei
Wang, Hao
Gao, Rui
Liang, Weiqian
author_facet Wei, Shuyin
Zeng, Feng
Zhou, Yingyue
Zhao, Jiawei
Wang, Hao
Gao, Rui
Liang, Weiqian
author_sort Wei, Shuyin
collection PubMed
description Substantial amounts of extracellular polymeric substances (EPS) are present in sludge from wastewater treatment plants (WWTP), and EPS can significantly affect the fate, bioavailability, and toxicity of microplastics (MPs) that coexist in the effluent, however, the mechanism of action between EPS and microplastics remains unclear. In addition, ultraviolet (UV) disinfection is indispensable in the wastewater treatment process in WWTP, which can significantly affect the characteristics of EPS. Therefore, it is of great significance to study the photochemical characteristics of EPS and the effect on binding MPs. In this study, using multispectral technology and two-dimensional correlation spectroscopy analysis, indicates that the molecular weight and aromaticity of EPS after phototransformation were reduced. The results showed that the adsorption of EPS on PSMPs was in the order of TB-EPS > LB-EPS > S-EPS, which was positively correlated with the SUVA(254), but negatively correlated with O/C of EPS. This indicates that the main adsorption mechanisms of PSMPs on EPS were π–π and hydrophobicity. The adsorption capacity of S-EPS, LB-EPS and TB-EPS to PSMPs decreased with the increasing of illumination time. After phototransformation, the adsorption sensitivity and reaction sequence of EPS and PSMPs did not change much. This research provides a theoretical basis for understanding the photochemical transformation of extracellular polymers and the morphology and migration of microplastics in sewage treatment, and evaluating the impact of microplastics on ecosystems.
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spelling pubmed-104784822023-09-06 Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics Wei, Shuyin Zeng, Feng Zhou, Yingyue Zhao, Jiawei Wang, Hao Gao, Rui Liang, Weiqian RSC Adv Chemistry Substantial amounts of extracellular polymeric substances (EPS) are present in sludge from wastewater treatment plants (WWTP), and EPS can significantly affect the fate, bioavailability, and toxicity of microplastics (MPs) that coexist in the effluent, however, the mechanism of action between EPS and microplastics remains unclear. In addition, ultraviolet (UV) disinfection is indispensable in the wastewater treatment process in WWTP, which can significantly affect the characteristics of EPS. Therefore, it is of great significance to study the photochemical characteristics of EPS and the effect on binding MPs. In this study, using multispectral technology and two-dimensional correlation spectroscopy analysis, indicates that the molecular weight and aromaticity of EPS after phototransformation were reduced. The results showed that the adsorption of EPS on PSMPs was in the order of TB-EPS > LB-EPS > S-EPS, which was positively correlated with the SUVA(254), but negatively correlated with O/C of EPS. This indicates that the main adsorption mechanisms of PSMPs on EPS were π–π and hydrophobicity. The adsorption capacity of S-EPS, LB-EPS and TB-EPS to PSMPs decreased with the increasing of illumination time. After phototransformation, the adsorption sensitivity and reaction sequence of EPS and PSMPs did not change much. This research provides a theoretical basis for understanding the photochemical transformation of extracellular polymers and the morphology and migration of microplastics in sewage treatment, and evaluating the impact of microplastics on ecosystems. The Royal Society of Chemistry 2023-09-05 /pmc/articles/PMC10478482/ /pubmed/37674486 http://dx.doi.org/10.1039/d3ra04027e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Wei, Shuyin
Zeng, Feng
Zhou, Yingyue
Zhao, Jiawei
Wang, Hao
Gao, Rui
Liang, Weiqian
Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title_full Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title_fullStr Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title_full_unstemmed Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title_short Phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
title_sort phototransformation of extracellular polymeric substances in activated sludge and their interaction with microplastics
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10478482/
https://www.ncbi.nlm.nih.gov/pubmed/37674486
http://dx.doi.org/10.1039/d3ra04027e
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