Reactivity of several classes of pesticides with UV,ozone and permanganate
The contamination of drinking water resources with micropollutants,such as pesticides,is of great concern nowadays.This work was to investtgate the reactivity of eight classes of 26 extensively Used pesticides listed in Table 1,with three common disinfectants including UV254(average intensity of 10.8mWcm-2),ozone(dosage of 4.1-6.2 mg·L-1)and permanganate(dosage of 15.8 mg.L-1).The reactions were allowed to proceed for 30min at pH 7.0 and ambient temperature(25±3℃).As shown in Table 1,results lndicate that under the applied experimental conditions,more than 95％of chlorobenzilate.Etridiazole,alachlor,butachlor,metolachlor,propachlor,atrazine,simazine,aldicarb,oxamyl and methiocarb could be effectively removed by UV254;and the removal efficiencies of other pesticides were over a range of 12.9％～77.7％.Ozone could completely degrade chloroneb,dichlorvos,bromacil,aldicarb,carbaryl,carbofuran,oxamyl and methiocarb;prometon and aldicarb sulfone were resistant to ozonation;and the removal efficiencies of other pesticides varied from 19.0％to 93.1％.Permanganate could fully degrade dichlorvos,aldicarb and methiocarb;organochlorines,dinitroanaline,anilinopyrimidine.Acetamides and other carbamates were resistant to permanganate oxidation;and the removal efficiencies of other pesticides ranged from 16.0％to 88.2％.If the practical disinfectant dosage applied in drinking water treatment is considered,it is expected that most of the pesticides will be completely degraded by ozone.A few by permanganate,but probably none by UV254.
pesticide UV ozone permanganate degradation drinking water treatment
LIU Chao QIANG Zhi-min TIAN Fang ZHANG Tao
State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,10085,China
国际会议
西安
英文
279-280
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）