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Simultaneous aerobic denitrification and antibiotics degradation by strain Marinobacter hydrocarbonoclasticus RAD-2
Institute of Agricultural Bio-Environmental Engineering, College of Bio-systems, Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
Högskolan i Borås, Akademin för textil, teknik och ekonomi. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
Laboratory of Microbial Resources, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310035, China.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
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2020 (engelsk)Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 313Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Simultaneous denitrification and antibiotics (oxytetracycline, OTC and ciprofloxacin, CFX) degradation was evaluated using a typical aerobic denitrifying strain Marinobacter hydrocarbonoclasticus RAD-2. There was no significant influence on the aerobic nitrate removal efficiency of strain RAD-2 in the presence of these two antibiotics. Along with denitrification, the average degradation rate of 2.92 mu g OTC L(-1)h(-1) was achieved, while no degradation was observed for CFX. The growth behavior indicated that an insignificant inhibition effect could have occurred at an antibiotics dosage lower than 300 mu g/L. The transcriptional results revealed that antibiotics exposure caused (< 2h) down-regulation of the denitrifying related genes, but triggered a significant subsequent up-regulation (4 h). Less nitrous oxide productions were observed in both aerobic and anoxic denitrification processes with antibiotics. Overall, the hormesis effect caused by antibiotics exposure indicated a potential approach to enhance the co-metabolism degradation performance for nitrate and antibiotics in aerobic denitrification.

sted, utgiver, år, opplag, sider
Elsevier, 2020. Vol. 313
Emneord [en]
Aerobic denitrification, Antibiotics degradation, Strain growth characteristics, Denitrifying gene expression, N2O production
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Identifikatorer
URN: urn:nbn:se:hb:diva-24812DOI: 10.1016/j.biortech.2020.123609ISI: 000551494900011Scopus ID: 2-s2.0-85085766105OAI: oai:DiVA.org:hb-24812DiVA, id: diva2:1521871
Tilgjengelig fra: 2021-01-25 Laget: 2021-01-25 Sist oppdatert: 2021-10-21bibliografisk kontrollert

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