DPQAC-PAC-MC复合改性粘土在不同介质中的絮凝行为研究

改性粘土法絮凝消除浮游微藻是我国迄今唯一得到大规模应用的有害赤潮应急处置方法,研发安全高效的改性粘土材料是该方法发展的重要方向之一.本文研究了双烷基聚氧乙烯基三季铵盐(DPQAC)与聚合氯化铝(PAC)复合改性粘土获得新材料DPQAC-PAC-MC在去离子水、海水及东海原甲藻藻液(Prorocentrum dongha...

COAGULATION OF DPQAC-PAC COMPOSITE MODIFIED CLAY IN DIFFERENT MEDIA

Modified clay is the only method for harmful red tide mitigation, which has been successfully applied in several large-scale fields in China. In this study, coagulation of DPQAC-PAC composite modified clay (DPQAC-PAC-MC) were studied in deionized water, seawater, and in Prorocentrum donghaiense, and the influences of sulfate ions and algal extracellular organic matters (EOMs) in culture water were analyzed, and the mechanisms of DPQAC-PAC-MC coagulation were analyzed. Results show that DPQAC-PAC-MC presented the best coagulation performance among others. The coagulation behavior of DPQAC-PAC-MC varied obviously in different media. In the culture of Prorocentrum donghaiense, the growth time of flocs was shortened, the strength was increased, and the flocculation effect was improved. When the optimal concentration was exceeded, the coagulation promoting effect decreased with the further increase of the concentration. The coagulation efficiency of DPQAC-PAC-MC could be improved with sulfate ions and EOMs. The excellent coagulating behavior of DPQAC-PAC-MC was resulted from:(1) the increasing of the positive surface potential and the bridge ability of the composite clay particles after modification; (2) a large number of sulfate ions and EOMs particles in algal cultures.