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Environ Res

Title:		"Deciphering the role of microplastic size on anaerobic sludge digestion: Changes of dissolved organic matter, leaching compounds and microbial community"
Author(s):		Sun M; Xiao K; Zhu Y; Ou B; Yu W; Liang S; Hou H; Yuan S; Gan F; Mi R; Yang J;
Address:		"School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei, 430074, China. School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei, 430074, China. Electronic address: xiaokeke@hust.edu.cn. Yangtze Ecology and Environment Co. Ltd., 96 Xudong Street, Wuhan, Hubei, 430074, China"
Journal Title:		Environ Res
Year:		2022
Volume:		20220808
Issue:		Pt 3
Page Number:		114032 -
DOI:		10.1016/j.envres.2022.114032
ISSN/ISBN:		1096-0953 (Electronic) 0013-9351 (Linking)
Abstract:		"Here the role of microplastic size on dissolved organic matter, leaching compounds and microbial community during anaerobic sludge digestion was evaluated. Compared to that without the addition of polyvinyl chloride (PVC), during the 30 days' incubation, the anaerobic sludge digestion by adding PVC at the size of 75 mum and the concentration of 2.4 g/g volatile solids (VS) showed a 8.5% lower cumulative methane production, while a 17.9% higher cumulative methane production was noted by adding PVC at the size of 3000 mum and the concentration of 2.4 g/g VS. A long-term fed-batch laboratory-scale fermenter test for 147 days further testified, that higher removal efficiencies of total solids, volatile solids, and total chemical oxygen demand, and higher methane production were noted by adding PVC (2.4 g/g VS, 3000 mum) into the fermenter. More interestingly, higher concentrations of proteins, polysaccharides, volatile fatty acids, and soluble microbial by-products component were noted in the liquid phase of sludge drawn from the fermenter added with PVC since the biomass therein showed higher efficiencies of solubilization, hydrolysis, acidification, and methanogenesis. Moreover, as identified from the fermenter added with PVC, dibutyl phthalate (DBP) was the most predominant leaching phthalates compound, although the biomass therein showed a 93.4% anaerobic biodegradability of DBP. The leaching of DBP drove the predominance of microbial community towards Synergistota and Methanosaeta. More irregular elliptical shallow dimples were noted on the PVC surface after 147 days' incubation, accompanied with abundances of Proteobacteria, Actinobacteriota, Chloroflexi, Methanosaeta and Methanobacterium. The results from this study showed that the size of microplastic was a crucial factor in evaluating its impact on anaerobic sludge digestion"
Keywords:		Anaerobiosis Bioreactors Digestion Dissolved Organic Matter Methane *Microbiota Microplastics Plastics Polyvinyl Chloride *Sewage/chemistry Anaerobic sludge digestion Leaching compounds Microbial community Microplastic size;
Notes:		"MedlineSun, Mei Xiao, Keke Zhu, Yuwei Ou, Bei Yu, Wenbo Liang, Sha Hou, Huijie Yuan, Shushan Gan, Fangmao Mi, Rongxi Yang, Jiakuan eng Research Support, Non-U.S. Gov't Netherlands 2022/08/12 Environ Res. 2022 Nov; 214(Pt 3):114032. doi: 10.1016/j.envres.2022.114032. Epub 2022 Aug 8"