1. Red mud-activated peroxymonosulfate process for the removal of fluoroquinolones in hospital wastewater
- Author
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Sunho Yoon, Joohyun Kim, Aymen Amine Assadi, Sungjun Bae, Gnougon Nina Coulibaly, Khalil Hanna, Konkuk University [Seoul], Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Campus France, NRF-2019R1C1C1003316, National Research Foundation of Korea, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Environmental Engineering ,Reducing agent ,0208 environmental biotechnology ,02 engineering and technology ,Hydroxylamine ,Wastewater ,010501 environmental sciences ,Ferric Compounds ,01 natural sciences ,Chloride ,Hydroxylation ,chemistry.chemical_compound ,Ciprofloxacin ,Flumequine ,medicine ,[CHIM]Chemical Sciences ,Waste Management and Disposal ,Peroxymonosulfate ,0105 earth and related environmental sciences ,Water Science and Technology ,Civil and Structural Engineering ,Red mud ,Ecological Modeling ,Phosphate ,Pollution ,Hospital wastewater ,6. Clean water ,Peroxides ,020801 environmental engineering ,chemistry ,Oxidation-Reduction ,Water Pollutants, Chemical ,Fluoroquinolones ,Nuclear chemistry ,medicine.drug - Abstract
International audience; In this study, a novel peroxymonosulfate (PMS) activation method, which combines a solid waste (i.e., red mud, RM) and a reducing agent (i.e., hydroxylamine, HA), for the oxidative degradation of fluoroquinolones (FQs; i.e., flumequine (FLU) and ciprofloxacin (CIP)) in hospital wastewater (HW) was developed. The addition of HA into the PMS/RM suspension significantly enhanced FLU removal, owing to its ability to enhance the Fe(III)/Fe(II) cycle on the RM surface. The results of the quenching experiments suggested the predominance of SO over OH in the PMS/RM/HA system. Moreover, owing to the greater reactivity between CIP and SO, CIP removal was more effective than FLU removal. Additionally, the liquid chromatography-mass spectroscopy (LC-MS) analysis revealed that the oxidation of CIP and FLU by PMS/RM/HA occurred via sequential and separate processes, involving ring cleavage, hydroxylation, decarbonylation, and defluorination. Surprisingly, the wastewater components exhibited contrasting effects on FLU removal in HW. Natural organic matter, nitrate and sulfate showed a slight impact on the removal performance of FLU, whereas chloride improved the oxidation extent. However, phosphate significantly inhibited the FLU removal because of its competitive binding at the RM surface and its scavenging effect towards SO. This inhibitory effect was overcome by increasing the PMS concentration and its sequential addition, thus guaranteeing successful mineralization of FLU in HW. These results show that the RM/HA system can be utilized to activate PMS for the removal of antibiotics in wastewater.
- Published
- 2020