【摘要】 研究了不同条件下的聚合氯化铝和聚丙烯酰胺复合絮凝剂(PAC-PAM)对含乳化油废水的絮凝效果,并与使用单一絮凝剂的效果进行了对比。通过单因素条件试验研究pH值、PAC:PAM配比、溶液温度和沉降时间等操作条件对PAC-PAM复合絮凝剂处理含油废水效果的影响,从而得到PAC-PAM复合絮凝剂处理含油废水的最优条件及絮凝机理。结果表明:PAC-PAM复合絮凝剂处理含乳化油废水的最佳操作条件为:PAC为30mg/L、PAM为6mg/L、溶液温度40℃、溶液pH值为7和沉降时间30min。以COD去除率代表絮凝效果的好坏,最优条件下的COD去除率达到84.57%。复合絮凝剂处理含乳化油废水的絮凝机理主要是:电中和破乳及高分子链的架桥综合作用。与使用单一絮凝剂PAC或PAM相比,PAC-PAM复合絮凝剂对含乳化油废水的絮凝效果更好。更多还原

【Abstract】 In this paper,effects of oily wastewater treated by polymeric aluminium( PAC) and polyacrylamide( PAM)composite flocculant were studied under different conditions and compared with that of treated by single flocculant.Through single factor condition experiments,the optimal conditions and flocculating mechanism of oily wastewater treated by PAC-PAM composite flocculant were determined by studying the influence of pH,ratio of PAC: PAM,solution temperature and settling time on the treating effects of oily wastewater treated by PAC- PAM composite flocculant.Results showed that the optimal conditions for oily wastewater treated by PAC- PAM composite flocculant were solution concentration of PAC 30 mg /L,PAM 6mg/L,temperature 40℃,pH 7 and settling time 30 min.Taking COD removal rate as the treating effects of oily wastewater treated by PAC- PAM composite flocculant,COD removal rate under optimal conditions reached 84.57%.Flocculating mechanism of oily wastewater treated by PAC- PAM composite flocculant is mainly of the combined effects which includes the demulsification by electrical neutralization and the bridging effect by macromolecular chain.By comparing the treating effects,using PAC- PAM composite flocculant is better than by using single flocculant of PAC or PAM in treating emulsified oily wastewater.更多还原