Tertiary/quaternary treatment of urban wastewater by UV/H2O2 or ozonation: Microplastics may affect removal of E. coli and contaminants of emerging concern

被引:17
|
作者
Adeel, Mister [1 ]
Maniakova, Gulnara [1 ]
Rizzo, Luigi [1 ]
机构
[1] Univ Salerno, Dept Civil Engn, Water Sci & Technol Grp WaSTe, Via Giovanni Paolo 2 132, I-84084 Fisciano, SA, Italy
关键词
Advanced oxidation processes; Antibiotics; Contaminants of emerging concern; Microplastics; Wastewater disinfection; Wastewater reuse; ANTIBIOTIC-RESISTANT BACTERIA; TREATMENT PLANTS; ULTRAVIOLET-LIGHT; DISINFECTION; INACTIVATION; UV; OZONE; ENVIRONMENT; PHOTOLYSIS; DEPENDENCE;
D O I
10.1016/j.scitotenv.2023.167940
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The aim of this study was to investigate the interference of polyethylene microplastics (MPs) on ultraviolet irradiation/hydrogen peroxide (UV/H2O2) and ozonation processes in the inactivation of E. coli bacteria (tertiary treatment) and removal of contaminants of emerging concern (CECs) (quaternary treatment) from simulated and real secondary treated urban wastewater. Three pharmaceuticals were investigated as model CECs, namely carbamazepine, sulfamethoxazole and trimethoprim. Experimental results showed that disinfection efficiency of UV/H2O2 treatment decreased (2.4, 1.8 and 1.3 log reductions of E. coli, initial H2O2 dose of 30 mg/L, 2.5 min treatment) as the initial concentration of MPs was increased (0.25, 0.5 and 1.0 g/L, respectively). Similarly, an increase in MPs concentration (0.25, 0.5 and 1.0 g/L) reduced the inactivation (4.7, 4.1 and 3.7 log reductions) of the target bacteria after 60 min of ozonation treatment. Although the disinfection efficiency of both treatment processes was negatively affected by the presence of MPs, UV/H2O2 was more effective than the ozonation, despite ozonation being investigated at high doses to better discriminate the effect of MPs. Noteworthy, CECs degradation by UV/H2O2 under realistic operating conditions was affected to some extent by MPs, while a lower effect was observed for ozonation, at not realistic ozone dose.
引用
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页数:9
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