The evaluation of long term performance of microbial fuel cell based Pb toxicity shock sensor

TY - JOUR

T1 - The evaluation of long term performance of microbial fuel cell based Pb toxicity shock sensor

AU - Xu, Min

AU - Li, Jianfeng

AU - Liu, Bingchuan

AU - Yang, Changzhu

AU - Hou, Huijie

AU - Hu, Jingping

AU - Yang, Jiakuan

AU - Xiao, Keke

AU - Liang, Sha

AU - Wang, Dongliang

N1 - Publisher Copyright: © 2020 Elsevier Ltd

PY - 2021/5

Y1 - 2021/5

N2 - Microbial fuel cell (MFC) sensor exhibits attractive prospects for online monitoring of water toxicity as an early warning device. However, the accumulation of dead cells in anode biofilm might decrease the sensing sensitivity of MFC during long term operation. In addition, with repeated exposure to toxins, the microbial community of anode biofilm would also adjust to build up higher endurance to environmental toxicity. In this study, the long term sensing sensitivity of MFC sensor and the microbial community changes were characterized with Pb2+ as the target toxin. The results show that newly formed biofilm with higher live/dead cell ratio exhibited higher sensitivity than mature biofilm. Modification of anodic biofilm via high current stimulation was applied to increase the ratio of live cells, which led to enhanced sensing sensitivity of MFC with mature anode biofilm. However, the enhancement was relatively limited for biofilm that was previously exposed to repeated Pb2+ shocks. Microbial community analysis revealed that the proportions of microbial species possessing higher environmental robustness, such as Hyphomicrobiaceae and Cloacibacillus, significantly increased in the anode biofilm after long term repeated Pb2+ shocks.

AB - Microbial fuel cell (MFC) sensor exhibits attractive prospects for online monitoring of water toxicity as an early warning device. However, the accumulation of dead cells in anode biofilm might decrease the sensing sensitivity of MFC during long term operation. In addition, with repeated exposure to toxins, the microbial community of anode biofilm would also adjust to build up higher endurance to environmental toxicity. In this study, the long term sensing sensitivity of MFC sensor and the microbial community changes were characterized with Pb2+ as the target toxin. The results show that newly formed biofilm with higher live/dead cell ratio exhibited higher sensitivity than mature biofilm. Modification of anodic biofilm via high current stimulation was applied to increase the ratio of live cells, which led to enhanced sensing sensitivity of MFC with mature anode biofilm. However, the enhancement was relatively limited for biofilm that was previously exposed to repeated Pb2+ shocks. Microbial community analysis revealed that the proportions of microbial species possessing higher environmental robustness, such as Hyphomicrobiaceae and Cloacibacillus, significantly increased in the anode biofilm after long term repeated Pb2+ shocks.

KW - High current stimulation

KW - Live/dead cells

KW - Microbial community

KW - Microbial fuel cell

KW - Toxicity sensor

UR - http://www.scopus.com/inward/record.url?scp=85098586817&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2020.129455

DO - 10.1016/j.chemosphere.2020.129455

M3 - 文章

C2 - 33401074

AN - SCOPUS:85098586817

SN - 0045-6535

VL - 270

JO - Chemosphere

JF - Chemosphere

M1 - 129455

ER -