Degradation of norfloxacin by hydroxyl radicals in algae bloom drinking water system
YU Yi-xuan1, BAI Min-dong2, YANG Xiao-tong2, JI Zhi-xin1, LI Ji3, YAO Li4
1. College of Marine Engineering, Dalian Maritime University, Dalian 116026, China;
2. College of Environment and Ecology, Xiamen University, Xiamen 361102, China;
3. Department of Physics, Institute of Computational Physics, Dalian Maritime University, Dalian 116026, China;
4. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
A water treatment system consisting of "coagulating sedimentation-sand filtration-·OH/NaClO antibiotic degradation and disinfection-clean water tank" was established with a capacity of 12000 t/d. A demonstration project was conducted during the period of algae bloom in Jiulong River. The total content of algae reached 2.04×103 cells/mL after sand filtration. Results show that under oxidant dosage of 0.5 mg/L within 20 s, ·OH degraded NFX from 56 ng/L to not detected, while NaClO only degraded to 54 ng/L. Meanwhile, ·OH inactivated all the algae cells. According to the analysis of HPLC-MS/MS, ·OH mineralized NFX into CO2 and H2O by breaking the C-F bond, and opening the piperazing, nalidixic and benzene rings. During ·OH disinfection, no disinfection by-products were formed and the 106 water indicators satisfied the Chinese Standard (GB5749-2006). This study provides a technology support to degrade antibiotics in algae bloom drinking water.
余忆玄, 白敏冬, 杨小桐, 吉志新, 李季, 姚丽. 高藻饮用水系统中羟基自由基降解诺氟沙星[J]. 中国环境科学, 2018, 38(12): 4545-4550.
YU Yi-xuan, BAI Min-dong, YANG Xiao-tong, JI Zhi-xin, LI Ji, YAO Li. Degradation of norfloxacin by hydroxyl radicals in algae bloom drinking water system. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4545-4550.
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