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有机磷农药的大量生产和使用对饮用水安全造成了潜在的巨大威胁。为了在饮用水源突发有机磷农药污染时保证饮用水安全,在水源水中进行了高锰酸钾氧化、粉末活性炭(PAC)吸附、臭氧氧化、O3/PAC和O3/H2O2 5种预处理技术对4种有机磷农药(乐果、敌敌畏、马拉硫磷和甲基对硫磷)的去除效果对比研究。实验结果表明,当水中乐果、敌敌畏浓度为266μg/L、3.6μg/L时,0.5 mg/L的高锰酸钾不能将其去除达标(国家生活饮用水卫生标准,GB 5749-2006);PAC对乐果和敌敌畏的吸附效果良好,20 mg/L的PAC能将低浓度的乐果(241μg/L)和中低浓度的敌敌畏(3.0～9.3μg/L)去除达标;臭氧对4种农药均有较好的去除效果,当CT(浓度×时间)值为17 mg.min/L时,除高浓度的乐果(729μg/L)和甲基对硫磷(276μg/L)外,其余农药均可以去除达标;采用O3/PAC和O3/H2O2高级氧化预处理,高浓度的乐果(629～710μg/L)和甲基对硫磷(364～428μg/L)均可迅速去除达标。
The mass production and use of organophosphorus pesticides poses a potentially huge threat to drinking water safety. In order to ensure the safety of drinking water in case of organophosphorus pesticide pollution in drinking water sources, potassium permanganate oxidation, powdered activated carbon (PAC) adsorption, ozone oxidation, O3 / PAC and O3 / H2O2 pretreatment Comparative Study on Removal Efficiency of Four Organophosphorus Pesticides (dimethoate, dichlorvos, malathion and methyl parathion). The experimental results showed that 0.5 mg / L potassium permanganate could not reach the standard when the concentration of dimethoate and dichlorvos was 266 μg / L and 3.6 μg / L, respectively (National Standard for Drinking Water Quality, GB 5749-2006). PAC had a good adsorption effect on dimethoate and dichlorvos, and 20 mg / L of PAC could remove low concentrations of dimethoate (241 μg / L) and moderate and low concentrations of dichlorvos (3.0 ~ 9.3 μg / L) Pesticides had better removal efficiency. When CT (concentration × time) was 17 mg.min / L, except for the high concentration of dimethoate (729 μg / L) and parathion methyl (276 μg / L) The remaining pesticides could be removed and reached the standard. O3 / PAC and O3 / H2O2 advanced oxidation pretreatment, high concentrations of dimethoate (629 ~ 710μg / L) and methyl parathion (364 ~ 428μg / L) .