Polyamide 6 microplastics facilitate methane production during anaerobic digestion of waste activated sludge

doi:10.1016/j.cej.2020.127251

	Polyamide 6 microplastics facilitate methane production during anaerobic digestion of waste activated sludge
	Chen, Hongbo 1; Tang, Mengge 1; Yang, Xiao 2; Tsang, Yiu Fai 3; Wu, Yanxin 1; Wang, Dongbo 4; Zhou, Yaoyu 5
刊名	CHEMICAL ENGINEERING JOURNAL
	2021-03-15
卷号	408 页码:10
关键词	Polyamide 6 Microplastics Methane production Waste activated sludge Anaerobic digestion
ISSN号	1385-8947
DOI	10.1016/j.cej.2020.127251
通讯作者	Chen, Hongbo(chenhongbo@hnu.edu.cn) ; Yang, Xiao(yangx@igsnrr.ac.cn)
英文摘要	Polyamide 6 (PA6) as a typical emerging microplastic pollutant has frequently been featured in wastewater treatment plants (WWTPs), yet its associated impact on waste activated sludge (WAS) anaerobic digestion process have not been fully understood. This study identified the key role of PA6 microplastics (5-50 particles/g TS) in methane production during anaerobic digestion through biochemical methane production testing and model-based analysis, and explored the mechanism involved by monitoring the conversion of metabolic intermediates, the activity of key enzymes, and the effects of leachate caprolactam (CPL). Unlike other microplastics that normally inhibit anaerobic digestion, PA6 significantly enhanced methane production due to the effect of CPL. The presence of 10 particles PA6/g TS improved methane production by 39.5% (from 124 +/- 6 to 173 +/- 8 L CH4/kg VS). Model-based analysis showed that PA6 promoted methane production potential and volatile solids destruction. PA6 offered marginal effect on the solubilization and hydrolysis of WAS, the leaching of CPL improved acidification and methanogenesis due to the promotion of key enzyme activities, which is the main reason why PA6 increased methane production. These findings indicate that PA6 is less toxic to WAS anaerobic digestion than other microplastics, which prompts an understanding of the dual role of microplastics in WWTPs.
资助项目	National Natural Science Foundation of China (NSFC)[51608464] ; Natural Science Foundation of Hunan Province[2020JJ4576]
WOS关键词	CHAIN FATTY-ACIDS ; PROMOTES HYDROGEN-PRODUCTION ; WATER TREATMENT PLANTS ; FREE NITROUS-ACID ; DARK FERMENTATION ; CALCIUM PEROXIDE ; FREE AMMONIA ; MECHANISMS ; BIODEGRADATION ; ENHANCEMENT
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000613346400005
资助机构	National Natural Science Foundation of China (NSFC) ; Natural Science Foundation of Hunan Province
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/160661]
专题	中国科学院地理科学与资源研究所
通讯作者	Chen, Hongbo; Yang, Xiao
作者单位	1.Xiangtan Univ, Coll Environm & Resources, Xiangtan 411105, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China 3.Educ Univ Hong Kong, Dept Sci & Environm Studies, Tai Po, Hong Kong 999077, Peoples R China 4.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China 5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Chen, Hongbo,Tang, Mengge,Yang, Xiao,et al. Polyamide 6 microplastics facilitate methane production during anaerobic digestion of waste activated sludge[J]. CHEMICAL ENGINEERING JOURNAL,2021,408:10.
APA	Chen, Hongbo.,Tang, Mengge.,Yang, Xiao.,Tsang, Yiu Fai.,Wu, Yanxin.,...&Zhou, Yaoyu.(2021).Polyamide 6 microplastics facilitate methane production during anaerobic digestion of waste activated sludge.CHEMICAL ENGINEERING JOURNAL,408,10.
MLA	Chen, Hongbo,et al."Polyamide 6 microplastics facilitate methane production during anaerobic digestion of waste activated sludge".CHEMICAL ENGINEERING JOURNAL 408(2021):10.