摘要
臭氧(O_(3))已被广泛应用于水深度处理中,但其无法有效降解耐O_(3)微量有机污染物(OR-MOPs)。针对OR-MOPs的强化降解,搭建了由O_(3)膜接触器和细管流光反应系统组成的膜接触O_(3)-紫外(UV)实验装置,并对O_(3)膜接触器的处理效果进行评估。结果表明,随着气相O_(3)质量浓度增加、溶液流量和pH的降低,液相O_(3)质量浓度升高;磷酸盐对O_(3)溶解没有影响;测得细管流光反应系统的UV剂量率为4.56×10^(-4)Einstein·m^(-2)·s^(-1)。当液相O_(3)质量浓度为1.0和2.0 mg·L^(-1)时,膜接触O_(3)-UV联用对代表性OR-MOP—布洛芬的去除率分别为63.2%和82.9%,比单独O_(3)氧化增加了38.1%和44.5%,且O_(3)被完全利用。布洛芬的降解效果随pH升高而提升,当液相O_(3)质量浓度为1.0 mg·L^(-1)、pH=9.0时,布洛芬的整体去除率最高(77.2%);在布洛芬各主要降解途径中,羟基自由基(HO·)氧化的贡献比达90%以上。膜接触O_(3)-UV联用可强化OR-MOPs的降解并提高O_(3)利用率,可为O_(3)在水深度处理中的应用提供新方法。
Ozone(O_(3)) has been widely used in advanced water treatment but can hardly degrade O_(3) resistant micro organic pollutants(OR-MOPs).For enhanced degradation of OR-MOPs,a membrane contact O_(3)-UV experimental system was developed by combining an O_(3) membrane contactor(OMC) and a mini-fluidic photoreaction system(MFPS).The performance of OMC was evaluated,showing that the dissolved O_(3) increases with the rise of gaseous O_(3) mass concentration,or decreases with the solution flow rate and pH;phosphate has no effect on the O_(3) dissolution;photon fluence rate of MFPS was determined as 4.56×10^(-4) Einstein·m-2·s^(-1).By using the combination of membrane contact O_(3) and UV processes,the removal efficiencies of ibuprofen,a representative OR-MOP,were 63.2% and 82.9% at aqueous O_(3) mass concentrations of 1.0 and 2.0 mg·L^(-1),which were 38.1% and 44.5% higher than those by sole ozonation,respectively,with O_(3) fully utilized.The degradation of ibuprofen was enhanced as the pH increased,and the highest removal efficiency(77.2%) of ibuprofen was achieved at aqueous O_(3) mass concentration of 1.0 mg·L^(-1) and pH = 9.0.Hydroxyl radical(HO·)oxidation contributed more than 90% of the main degradation pathways of ibuprofen.This study demonstrated that the combination of membrane contact O_(3) and UV processes could enhance the degradation of OR-MOPs and improve the O_(3) utilization efficiency,which provided a new method for application of O_(3) in water advanced treatment.
作者
王颖
李梦凯
孙喆
张会敏
HANS C.B.Hansen
强志民
WANG Ying;LI Mengkai;SUN Zhe;ZHANG Huimin;Hans C.B.Hansen;QIANG Zhimin(Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,18 Shuang-qing Road,Beijing 100085,China;Department of Plant and Environmental Sciences,University of Copenhagen,Thorvaldsensvej 40,1871 Frederiksberg C,Denmark;Sino-Danish College,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Onyx Environmental Technology Co.Ltd,Beijing 100085,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2022年第6期1807-1814,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51878653)。
关键词
膜接触臭氧
紫外
臭氧氧化
高级氧化
耐臭氧微量有机污染物
membrane contact O_(3)
UV
ozonation
advanced oxidation
O_(3)resistant micro organic pollutants
