粉末吸附材料协同HPAM强化混凝消除微污染水中OCPs

以阴离子型聚丙烯酰胺(HPAM)为絮凝剂,采用强化混凝的处理方法,对微污染水中有机氯农药(OCPs)的消除进行了研究。考察了HAPM投加量、pH值、原水浊度、粉末活性炭及改性凹凸棒土助凝剂等因素对OCPs消除效果的影响。结果表明,HPAM投加量为0.05~0.1 mg/L时,OCPs不同异构体的去除率可达57.00%~74.56%;浊度去除率与OCPs去除率之间显著相关(p<0.05),较高的原水浊度有利于HPAM对OCPs的去除;HPAM混凝消除OCPs的最佳pH值为5~6;改性凹凸棒土作为助凝剂复配HPAM可有效提高OCPs的去除率,粉末活性炭复配效果不明显,所以凹凸棒土比粉末活性炭更加适合作为助凝剂在强化混凝中去除OCPs。

Elimination of OCPs in micro-polluted water by coagulation with HPAM and helps of powder materials

The elimination of organochlorine pesticides (OCPs) in micro-polluted water by enhanced coagulation with anionic polyacrylamide (HPAM) was investigated. The effects of coagulant dosage, pH values, initial turbidity, as well as the addition of powder activated carbon and modified attapulgite on the elimination efficiency of OCPs were determined respectively. The results showed that the removal rates of different OCP isomers reached 57.00%—74.56% with the coagulant dosage of 0.05—0.1 mg/L. The removal rates of turbidity and OCPs were significantly correlated. The best pH values for the OCPs elimination were in the range of 5—6. The higher turbidity of raw water was helpful to the removal of OCPs. The modified attapulgite used as assistant coagulants improved the removal of OCPs efficiently, while the improvement was not obvious when powder activated carbon was used as the assistant coagulant, therefore, the modified attapulgite is more suitable to be used as the assistant coagulant in the enhanced coagulation to remove OCPs compared to the powder activated carbon.