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Indexed by:Journal Papers

Date of Publication:2020-02-01

Journal:BIORESOURCE TECHNOLOGY

Included Journals:PubMed、EI、SCIE

Volume:297

Page Number:122382

ISSN No.:0960-8524

Key Words:Anaerobic digestion; Antagonistic; Inhibition; ZnO NPs; Surfactant

Abstract:The objective of this study was to evaluate the antagonistic effect of emerging pollutants of zinc oxide nano-particles (ZnO NPs) and sodium dodecyl sulfate (SDS) on anaerobic digestion and explore their potential mechanism. The results indicated that at a low inhibitory concentration of ZnO NPs (1.0 mM), the practical co-inhibition was decreased by 24% and 18% in co-existence of 50 mg/L SDS and 300 mg/L SDS, respectively. More importantly, the co-existence of 300 mg/L SDS greatly enhanced methanogenesis of organics in seriously inhibited case (2.0 mM of ZnO NPs). The microbial community analysis showed that co-existed SDS enhanced the growth of Methanothrix, Methanosarcina and Methanobacterium. The antagonistic enhancement could be attributed to the net charge reversal, partially agglomeration of ZnO NPs and/or reduction of Zn2+ release in the presence of SDS. These findings could provide useful information for evaluating the co-inhibition of SDS and ZnO NPs on biological processes.