Responses of electroactive biofilms to chronic chlorine exposure: Insights from the composition and spatial structure of extracellular polymeric substances.
Bioelectrochemistry
; 142: 107894, 2021 Dec.
Article
in English
| MEDLINE | ID: covidwho-1330658
ABSTRACT
Extensive amounts of chlorine disinfectants have been applied to wastewater system since the outbreak of coronavirus disease 2019 (COVID-19), which inevitably affects the pollutant degradation via interfering with electron transfer mediated by electroactive bacteria. Herein, the response of electroactive biofilm (EAB) to chronic chlorine exposure was investigated. Results showed the EAB formed without exposure (EAB-0) exhibited a 53% and 123% higher current output than that formed with 0.1â¯mg L-1 (EAB-0.1) and 0.5â¯mg L-1 (EAB-0.5) chlorine, respectively. The chronic chlorine exposure of EAB boosted the contents of extracellular polymeric substances (EPS) in EAB-0.1 and EAB-0.5 by over secretion of extracellular polysaccharides. The EAB-0.1 and EAB-0.5 also presented lower electron exchange capacities (EECs) of EPS, coincided with reduced relative abundance of Geobacter from 61% in EAB-0 to 52% in EAB-0.5. This study provided new insights into the application of engineered EAB for wastewater treatment in a disinfection environment.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Chlorine
/
Biofilms
/
Disinfectants
/
Extracellular Polymeric Substance Matrix
Language:
English
Journal:
Bioelectrochemistry
Journal subject:
Biochemistry
Year:
2021
Document Type:
Article
Affiliation country:
J.bioelechem.2021.107894
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