Release Time:2020-02-19  Hits:

Indexed by: Journal Papers

Date of Publication: 2020-02-01

Journal: BIORESOURCE TECHNOLOGY

Included Journals: SCIE、EI、PubMed

Volume: 297

Page Number: 122382

ISSN: 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.