Removal of methylisothiazolinone biocide from wastewater by VUV/UV advanced oxidation process: Kinetics, mechanisms and toxicity

被引：11
|
作者：
Huang, Nan [1 ,3 ]
Shao, Wan-Ting [1 ,3 ]
Wang, Wen-Long [2 ]
Wang, Qi [1 ,3 ]
Chen, Zhi-Qiang [4 ]
Wu, Qian-Yuan [2 ]
Hu, Hong-Ying [1 ,5 ]
机构：
[1] Tsinghua Univ, Sch Environm, Environm Simulat & Pollut Control State Key Joint, State Environm Protect Key Lab Microorganism Appli, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Inst Environm & Ecol, Guangdong Prov Engn Res Ctr Urban Water Recycling, Tsinghua Shenzhen Int Grad Sch,Key Lab Microorgani, Shenzhen 518055, Peoples R China
[3] Beijing Lab Environm Frontier Technol, Beijing 100084, Peoples R China
[4] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
[5] Tsinghua, Res Inst Environm Innovat Suzhou, Suzhou 215163, Jiangsu, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2022年 / 315卷
关键词：
Vacuum-UV; Antimicrobial; Degradation mechanisms; Toxicity evaluation; Reverse osmosis concentrate; DEGRADATION KINETICS; 185; NM; VACUUM; MICROPOLLUTANTS;
D O I：
10.1016/j.jenvman.2022.115107
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Methylisothiazolinone (MIT) is frequently used as antimicrobial in household and industrial products, and poses ecological and health risks to aquatic organisms and humans. In this study, vacuum ultraviolet (VUV)/ultraviolet (UV) irradiation was found highly efficient for removal of MIT. The rate constant of MIT degradation (kobs) under VUV/UV irradiation was 3.75 mu Einstein(-1) cm(2), which was around 12.5 times higher than that under UV irradiation. The center dot & nbsp;OH concentration during the VUV/UV process was 1.0 x 10(-12) M. The contributions of UV photolysis and .center dot & nbsp;OH oxidation to MIT degradation under VUV/UV irradiation were 7.3% and 92.7%, respectively. The optimum solution pH (6.0-7.1) gave kobs 33%-39% higher than those at pH 3.9 and 9.3. CO32- /HCO(3)(- )inhibitedMIT degradation and the kobs decreased by 74% when the concentration of CO32- /HCO3- was increased to 1 mM. The order of MIT removal efficiency under VUV/UV irradiation was ultrapure water > secondary effluent > reverse osmosis (RO) concentrate, because of the light screening and .& nbsp;OH quenching effect of actual wastewater. In RO concentrate, the rate constant of MIT degradation under VUV/UV irradiation was 22% higher than that obtained under UV irradiation. The reduction of TOC, UV254, and total fluorescence regional integration of the RO concentrate during VUV/UV process were 7.2%, 34.9%, and 52.3%, respectively. Twelve main transformation products of MIT were identified after VUV/UV degradation. The main degradation mechanisms of MIT were sulfur atom oxidation and hydroxyl addition. Quantitative structure-activity relationship analysis showed that VUV/UV degradation was an efficient method to remove the toxicity of MIT.
引用
收藏
页数：7
相关论文
共 23 条
  • [21] Potential of combined advanced oxidation - Biological process for cost-effective organic matters removal in reverse osmosis concentrate produced from industrial wastewater reclamation: Screening of AOP pre-treatment technologies
    Cai, Q. Q.
    Wu, M. Y.
    Li, R.
    Deng, S. H.
    Lee, B. C. Y.
    Ong, S. L.
    Hu, J. Y.
    CHEMICAL ENGINEERING JOURNAL, 2020, 389
  • [22] Destruction of microcystins (cyanotoxins) by UV-254 nm-based direct photolysis and advanced oxidation processes (AOPs): Influence of variable amino acids on the degradation kinetics and reaction mechanisms
    He, Xuexiang
    de la Cruz, Armah A.
    Hiskia, Anastasia
    Kaloudis, Triantafyllos
    O'Shea, Kevin
    Dionysiou, Dionysios D.
    WATER RESEARCH, 2015, 74 : 227 - 238
  • [23] UV/H2O2 oxidation process optimization by response surface methodology for removal of polycyclic aromatic hydrocarbons (PAHs) from water
    Malakahmad, Amirhossein
    Ho, Lawrence Ling Hoe
    DESALINATION AND WATER TREATMENT, 2017, 65 : 408 - 417
123