Unravelling ciprofloxacin removal in a nitrifying moving bed biofilm reactor: Biodegradation mechanisms and pathways.

Xu, Y; Gu, Y; Peng, L; Wang, N; Chen, S; Liang, C; Liu, Y; Ni, B-J

Unravelling ciprofloxacin removal in a nitrifying moving bed biofilm reactor: Biodegradation mechanisms and pathways.

Xu, Y Gu, Y Peng, L Wang, N Chen, S Liang, C Liu, Y

Ni, B-J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Chemosphere, 2023, 320, pp. 138099
Issue Date:: 2023-04

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Field	Value	Language
dc.contributor.author	Xu, Y
dc.contributor.author	Gu, Y
dc.contributor.author	Peng, L
dc.contributor.author	Wang, N
dc.contributor.author	Chen, S
dc.contributor.author	Liang, C
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961
dc.contributor.author	Ni, B-J
dc.date.accessioned	2023-03-22T02:29:41Z
dc.date.available	2023-02-07
dc.date.available	2023-03-22T02:29:41Z
dc.date.issued	2023-04
dc.identifier.citation	Chemosphere, 2023, 320, pp. 138099
dc.identifier.issn	0045-6535
dc.identifier.issn	1879-1298
dc.identifier.uri	http://hdl.handle.net/10453/168040
dc.description.abstract	Although moving bed biofilm reactors (MBBRs) have shown excellent antibiotic removal potentials, the information on underlying mechanisms is yet limited. This work assessed the removal of ciprofloxacin in an enriched nitrifying MBBR by clarifying the contribution of adsorption and microbial-induced biodegradation. Results demonstrated the considerable biomass adsorption (55%) in first 30 min. Limiting nitrite oxidizing bacteria growth or inhibiting nitrification would lead to lower adsorption capacities. The highest ciprofloxacin biodegradation rate constant was 0.082 L g SS-1 h-1 in the presence of ammonium, owing to ammonia oxidizing bacteria (AOB)-induced cometabolism, while heterotrophs played an insignificant role (∼9%) in ciprofloxacin biodegradation. The developed model also suggested the importance of AOB-induced cometabolism and metabolism over heterotrophs-induced biodegradation by analyzing the respective biodegradation coefficients. Cometabolic biodegradation pathways of ciprofloxacin mainly involved the piperazine ring cleavage, probably alleviating antimicrobial activities. It implies the feasibility of nitrifying biofilm systems towards efficient antibiotic removal from wastewater.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Chemosphere
dc.relation.isbasedon	10.1016/j.chemosphere.2023.138099
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.classification	Meteorology & Atmospheric Sciences
dc.subject.mesh	Ciprofloxacin
dc.subject.mesh	Biofilms
dc.subject.mesh	Bioreactors
dc.subject.mesh	Wastewater
dc.subject.mesh	Anti-Bacterial Agents
dc.subject.mesh	Nitrification
dc.subject.mesh	Ammonia
dc.subject.mesh	Biofilms
dc.subject.mesh	Ammonia
dc.subject.mesh	Ciprofloxacin
dc.subject.mesh	Anti-Bacterial Agents
dc.subject.mesh	Bioreactors
dc.subject.mesh	Nitrification
dc.subject.mesh	Wastewater
dc.title	Unravelling ciprofloxacin removal in a nitrifying moving bed biofilm reactor: Biodegradation mechanisms and pathways.
dc.type	Journal Article
utslib.citation.volume	320
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-22T02:29:34Z
pubs.publication-status	Published
pubs.volume	320

Abstract:

Although moving bed biofilm reactors (MBBRs) have shown excellent antibiotic removal potentials, the information on underlying mechanisms is yet limited. This work assessed the removal of ciprofloxacin in an enriched nitrifying MBBR by clarifying the contribution of adsorption and microbial-induced biodegradation. Results demonstrated the considerable biomass adsorption (55%) in first 30 min. Limiting nitrite oxidizing bacteria growth or inhibiting nitrification would lead to lower adsorption capacities. The highest ciprofloxacin biodegradation rate constant was 0.082 L g SS-1 h-1 in the presence of ammonium, owing to ammonia oxidizing bacteria (AOB)-induced cometabolism, while heterotrophs played an insignificant role (∼9%) in ciprofloxacin biodegradation. The developed model also suggested the importance of AOB-induced cometabolism and metabolism over heterotrophs-induced biodegradation by analyzing the respective biodegradation coefficients. Cometabolic biodegradation pathways of ciprofloxacin mainly involved the piperazine ring cleavage, probably alleviating antimicrobial activities. It implies the feasibility of nitrifying biofilm systems towards efficient antibiotic removal from wastewater.

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http://hdl.handle.net/10453/168040