PAFC对水体中持久性有机污染物PFOA的混凝效果

针对含全氟辛酸(PFOA)的工业废水及应对PFOA的污染突发事件,采用PAFC及其复配粘土矿物凹凸棒和沸石进行混凝实验,并对几个影响因素进行了考察。结果表明,在PAFC的最佳投加量10 mg/L时,PFOA和浊度的去除率分别达到70.25%和99.42%,PAFC混凝处理PFOA的效果优于PAC;pH值对PAFC去除PFOA有一定的影响,当pH大于6时有利于PFOA的去除;PFOA和浊度的去除率随原始浊度的增加而增加;活性炭、盐酸改性凹凸棒、盐酸改性沸石、CT-MAB改性的沸石复配PAFC均可提高PFOA的去除率;改性处理后的沸石应用于PFOA的处理中,有望降低处理成本。

Coagulation effects of persistent organic pollutant PFOA in water by PAFC

Perfluorooctanoate (PFOA) as one of emerging contaminants, has been attracting increasing concerns in recent years. Model solution was treated using primary flocculant polyaluminum ferric chloride (PAFC) and coagulant aid attapulgite or zeolite were conducted in this work. The experimental results showed that the removal rate of PFOA and turbidity reached 70.25% and 99.42%, respectively at the optimal PAFC dosage of 10 mg/L, and the removal effect of PFOA by PAFC was better than PAC.The removal rate of PFOA is significantly affected by the pH value of solution, and the maximum removal of PFOA is obtained at the near neutral solution pH value. The removal rate of PFOA and turbidity increases with the increasing in initial turbidity.The removal rate of PFOA is enhanced by PAFC combined with some coagulant aid, such as activited carbon,hydrochloric acid modified attapulgite and zeolite,CTMAB modified zeolite. Using PAFC and the modified zeolite maybe is an efficient and feasible method to remove PFOA from water.