Title of Paper:Phenol removal performance and microbial community shift during pH shock in a moving bed biofilm reactor (MBBR).

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Date of Publication:2018-01-01

Journal:Journal of hazardous materials

Included Journals:PubMed、SCIE、EI

Volume:351

Page Number:71-79

ISSN No.:1873-3336

Key Words:Phenol; Moving bed biofilm reactor; Acidic; Microbial community; pH shock

Abstract:A moving bed biofilm reactor (MBBR) effectively removes pollutants and even runs under extreme conditions. However, the pH shock resistance of a biofilm in MBBRs has been rarely reported. In this study, simulated phenol wastewater with acidic shock (pH 7.5-3.0) was used. In the pH shock phase, the phenol and COD removal efficiencies initially decreased and gradually increased to more than 90%. Microscopic studies showed that the superficial biofilm was mainly composed of fungi (yeasts) in the acidic pH shock phase. The microbial community composition in the acidic pH shock phase was significantly different from those in other phases. Firmicutes and Ascomycota were the dominant bacterial and fungal phyla in this stage, respectively. 16S rRNA gene-based functional annotation indicated that functional profiles related to aromatic compound degradation existed in all of the stages. Therefore, MBBRs show potential for the treatment of phenolic wastewater exposed to pH shock. Copyright © 2018 Elsevier B.V. All rights reserved.