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Enhancement of fipronil degradation with eliminating its toxicity in a microbial fuel cell and the catabolic versatility of anodic biofilm

Author:
Zhang, Qinghua, Zhang, Lei, Li, Zehua, Zhang, Lixia, Li, Daping
Source:
Bioresource technology 2019 v.290 pp. 121723
ISSN:
0960-8524
Subject:
Azoarcus, Azospirillum, Chryseobacterium, Danio rerio, Pseudomonas, acute toxicity, azoxystrobin, bacteria, biofilm, energy, fipronil, fluoroglycofen, mathematical models, microbial communities, microbial fuel cells, pH, pollution, sulfanilamide, wastes
Abstract:
The degradation of fipronil was investigated in microbial fuel cells (MFCs). Almost 79% of 30 mg/L fipronil was rapidly degraded within 12 h by MFC biofilm. Based on the constructed quadratic polynomial model, a maximum fipronil degradation rate of 94.22% could be theoretically achieved at pH of 7.01, 33.39 °C, and the initial fipronil concentration 74 mg/L after incubation for 72 h. The high acute toxicity of fipronil toward zebrafish was largely eliminated after degradation by the MFC. In addition, the MFC biofilm showed catabolic versatility to 4-chloronitrobenzene, sulfanilamide, fluoroglycofen, and azoxystrobin. The microbial community analysis revealed that the functional bacteria Sphaerochaeta, Pseudomonas, Azospirillum, Azoarcus, and Chryseobacterium were major predominant bacteria in the anodic biofilm. Therefore, the MFC offers a promising approach in treating the environmental contaminants due to its abilities of energy capture from waste substances and catabolic versatility to different organic compounds.
Agid:
6495790