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Article

Insight into the Removal of Enoxacin in an Anaerobic Sulfur-Mediated Wastewater Treatment System: Performance, Kinetics and Mechanisms

by 1,†, 1,†, 1, 1,*, 2,3 and 2,3,*
1
School of Ecology, Shenzhen Campus, Sun Yat-sen University, Shenzhen 518107, China
2
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
3
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Pierre Buffière
Water 2022, 14(18), 2896; https://doi.org/10.3390/w14182896
Received: 24 July 2022 / Revised: 4 September 2022 / Accepted: 9 September 2022 / Published: 16 September 2022
The removal of enoxacin (ENO), a broad-spectrum fluoroquinolone antibiotic, was firstly examined in a sulfate-reducing up-flow sludge bed (SRUSB) bioreactor over a long-term operation (366 days). Over 94% of the ENO was removed in the SRUSB bioreactor via adsorption and biodegradation at different initial ENO concentrations (i.e., 25–1000 μg/L). Based on the results of the batch tests, the sulfate-reducing sludge exhibited a high ENO adsorption capacity within a kd of 22.7–28.9 L/g-SS. The adsorption of ENO by the sulfate-reducing sludge was a spontaneous (ΔG° < 0 KJ/mol) and exothermic (ΔH° < 0 KJ/mol) process including physisorption and chemisorption (absolute value of ΔH° = 51.882 KJ/mol). Moreover, ENO was effectively biodegraded by the sulfate-reducing sludge within specific rates of 2.5–161.3 μg/g-SS/d. The ENO biodegradation process in the sulfate-reducing sludge system was most accurately described by the first-order kinetic model. Collectively, our findings provide insight into the applicability of a sulfate-reducing sludge system for ENO-contaminated wastewater treatment. View Full-Text
Keywords: enoxacin (ENO); adsorption; biodegradation; sulfate-reducing sludge enoxacin (ENO); adsorption; biodegradation; sulfate-reducing sludge
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MDPI and ACS Style

Yan, Y.; Ou, Y.; Yang, B.; Jia, Y.; Sun, L.; Lu, H. Insight into the Removal of Enoxacin in an Anaerobic Sulfur-Mediated Wastewater Treatment System: Performance, Kinetics and Mechanisms. Water 2022, 14, 2896. https://doi.org/10.3390/w14182896

AMA Style

Yan Y, Ou Y, Yang B, Jia Y, Sun L, Lu H. Insight into the Removal of Enoxacin in an Anaerobic Sulfur-Mediated Wastewater Treatment System: Performance, Kinetics and Mechanisms. Water. 2022; 14(18):2896. https://doi.org/10.3390/w14182896

Chicago/Turabian Style

Yan, Yujian, Yuyi Ou, Boyi Yang, Yanyan Jia, Lianpeng Sun, and Hui Lu. 2022. "Insight into the Removal of Enoxacin in an Anaerobic Sulfur-Mediated Wastewater Treatment System: Performance, Kinetics and Mechanisms" Water 14, no. 18: 2896. https://doi.org/10.3390/w14182896

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