摘要
利用太阳光和一氯胺(太阳光/NH_(2)Cl)体系降解阿司匹林(aspirin,ASA)、氟尼辛葡甲胺(flunixin meglumine,FMME)、苯甲酸(benzoic acid,BA)以及硝基苯(nitrobenzene,NB)4种代表性微污染物,探究该体系对于微污染物的降解效能以及动力学特征。结果表明,单独太阳光以及单独NH_(2)Cl体系对污染物几乎均无降解效果(降解率<5%),而太阳光/NH_(2)Cl体系中污染物的降解效能显著提升,pH的改变对4种污染物降解效能的影响各不相同。在实验pH条件下,以活性氮自由基和活性氯自由基为主的其他活性组分和NH_(2)Cl对FMME的降解起主要作用(贡献率为79.27%~89.39%),而羟基自由基(HO·)始终是ASA的降解中贡献最大的活性组分(贡献率为44.9%~76.8%)。在酸性环境中,太阳光/NH_(2)Cl体系产生的消毒副产物质量浓度及毒性方面均大于单独NH_(2)Cl体系,而在碱性条件下其产生的消毒副产物质量浓度则明显降低,实际中应用本体系进行消毒时应考虑将pH调至碱性。
In this study,the Solar/chloramine system was used to degrade four representative micro-pollutants,including aspirin(ASA),flunixin glucosamine(FMME),benzoic acid(BA),and nitrobenzene(NB),and the degradation efficiency and kinetic characteristics of the system were investigated.The experimental results showed that both Solar alone and NH_(2)Cl alone systems led to low removal(the degradation rate<5%).However,the degradation of the pollutants in the Solar/NH_(2)Cl system increased significantly,and pH variation had different effects on degradation of the four pollutants.Under the experimental pH conditions,NH_(2)Cl and other active components such as reactive nitrogen species,reactive chlorine species contributed to most FMME degradation(the contribution rate was 79.27%~89.39%),while hydroxyl radicals(HO·)made a dominant contribution to the degradation of ASA(the contribution rate was 44.9%~76.8%).Under acidic conditions,the concentration and toxicity of disinfection by-products(DBPs)produced in Solar/NH_(2)Cl system were higher than those in NH_(2)Cl alone.Nevertheless,the concentration of DBPs in Solar/NH_(2)Cl system decreased significantly under alkaline conditions.Thus,the pH should be adjusted to alkaline when this system is used to disinfect water in practice.
作者
柏松
刘军
陈鸣
陈凯阳
谈超群
BAI Song;LIU Jun;CHEN Ming;CHEN Kaiyang;TAN Chaoqun(Nanjing Environmental Monitoring Center of Jiangsu Province,Nanjing 210041,China;Nanjing Research Institute of Environmental Protection,Nanjing 210041,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第11期3515-3524,共10页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金面上项目(52070041)
江苏省自然科学基金面上项目(BK20211175)。
关键词
氯胺
微污染物
动力学
活性组分
消毒副产物
chloramine
micro-pollutants
kinetics
reactive species
disinfection byproducts
