粉末活性炭应急处理阿特拉津突发污染原水的研究

以黄浦江上游水源地取水口突发阿特拉津污染为背景,从实验室小试和中试2个尺度上,研究了粉末活性炭(PAC)对阿特拉津污染的应急处理效果。小试结果表明,增大PAC投加量,阿特拉津的去除率显著提高,PAC对各浓度水平阿特拉津污染的去除主要集中在前10 min,历时60 min左右,吸附达到平衡。平衡吸附量随着原水中阿特拉津初始浓度的增大而增大,但PAC对污染物的应急处理效率却随之降低。Fre undlich等温吸附模型较Langmuir模型可更好地拟合PAC对阿特拉津的吸附规律。中试表明,针对10μg/L和20μg/L的阿特拉津污染,分别投加5 mg/L和20mg/L PAC,即可使出水浓度达标;针对100μg/L和200μg/L的阿特拉津污染,投加PAC 50mg/L,出水浓度分别超标7倍和14倍。

Research on Emergency Treatment of Accidental Atrazine Pollution of Raw Water by Powdered Activated Carbon

In the background of atrazine pollution suddenly occurred in Huangpu upriver source water,emergency adsorption treatment efficiency of atrazine by powdered activated carbon(PAC) is researched via laboratory and pilot tests.The laboratory test results shows that the removal rate of atrazine notably increases with PAC dosage.Atrazine at each concentration level can be quickly decreased by PAC in 10 minutes and the adsorption equilibrium is reached in 60 minutes.The equilibrium adsorption capacities increase with initial concentration of atrazine in raw water.But the emergency adsorption treatment efficiency decreases with the rise of initial concentration of atrazine.Freundlich model can better describe the isothermal adsorption law than Langmuir model.Pilot tests show that,for the atrazine pollution with initial concentration of 10 μg/L and 20 μg/L,adding 5 mg/L and 20 mg/L PAC respectively,atrazine concentration of effluent is below standard value.For 100 μg/L and 200 μg/L atrazine contamination,adding PAC 50 mg/L,the average atrazine concentrations of effluent exceeds 7 times and 14 times of standard value.