受典型除草剂污染原水的应急处理工艺研究

以水中阿特拉津和莠灭净浓度突增为背景,研究了混凝、PAC吸附和PAC吸附＋混凝等工艺对它们的去除效率,同时根据原水水质的变化和水厂的常用工艺,分别考察了混凝剂投加量、pH值、预氧化对混凝去除阿特拉津和莠灭净的影响,以及目标物初始浓度、天然有机物浓度和预氧化对PAC吸附的影响。结果表明,调节pH值及采取预氧化措施均能改善混凝对阿特拉津和莠灭净的去除效果,但其出水浓度仍不能达标;天然有机物浓度对PAC吸附的影响并非是简单的线性关系,同时投加氧化剂和PAC会相互削弱其作用,PAC吸附＋混凝才是去除阿特拉津和莠灭净最简单、有效的方法。

Study on Emergent Treatment of Raw Water Polluted by Herbicide

The removal efficiencies of atrazine and ametryne by coagulation, PAC adsorption and PAC adsorption coupled with coagulation in the background of their concentration sudden increase in water were studied. According to the change of raw water quality and the conventional treatment processes, the influence of the coagulant dosage, pH value and preoxidation on removal of atrazine and ametryne by coagulation and the influence of original concentration of target substances, concentration of NOM and preoxidation on PAC adsorption were investigated. The results indicate that regulating pH value and preoxidation can improve the removal efficiencies of atrazine and ametryne by coagulation, but the concentration of treated water does not reach the standards and the concentration of NOM does not affect the adsorption of PAC linearly, and simultaneous addition of oxidants and PAC may weaken their function mutually. Therefore, PAC adsorption coupled with coagulation is the simplest and most effective method for removing atrazine and ametryne.