Red mud-activated peroxymonosulfate process for the removal of fluoroquinolones in hospital wastewater

WATER RESEARCH

卷:184

Article

Kim, Joohyun¹  Coulibaly, Gnougon Nina²  Yoon, Sunho¹  Assadi, Aymen Amin²  Hanna, Khalil^2,3  Bae, Sungjun¹ 

[1] Konkuk Univ, Dept Civil & Environm Engn, 120 Neungdong Ro, Seoul 05029, South Korea

[2] Univ Rennes, CNRS, Ecole Natl Super Chim Rennes, ISCR UMR 6226, F-35000 Rennes, France

[3] MESRI, Inst Univ France IUF, 1 Rue Descartes, F-75231 Paris, France

关键词: Flumequine;    Ciprofloxacin;    Hospital wastewater;    Red mud;    Hydroxylamine;    Peroxymonosulfate;   

DOI  :  10.1016/j.watres.2020.116171

来源: Elsevier

【 摘 要 】

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 fluoro-quinolones (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 SO4 center dot- over (OH)-O-center dot in the PMS/RM/HA system. Moreover, owing to the greater reactivity between CIP and SO4 center dot-, 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 SO4 center dot-. 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. (c) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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