Investigation of dynamic processing on aluminum floc aggregation:Cyclic shearing recovery and effect of sulfate ion  

作　　者：CHU YongBao GAO BaoYu YUE QinYan WANG Yan 

机构地区：[1]School of Environment and Safety Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]School of Environmental Science and Engineering,Shandong University,Jinan 250100,China

出　　处：《Science China Chemistry》2008年第4期386-392,共7页中国科学（化学英文版）

基　　金：Supported by the subproject of "863" Project of China (Grant No. 2002AA601290-5);the Natural Science Foundation of Shandong Province (Grant No. Y2002B03);the National Natural Science Foundation of China (Grant No. 50678095)

摘　　要：The floc formation and re-aggregation potential and the effects of sulfate on coagulation by AlCl3, polyaluminum chloride (PAC), and Al13 species using a photometric dispersion analyzer (PDA) are in- vestigated. It is found that the recovery level from shearing is the highest for the Al13 species. This is likely a result of increased collision efficiency due to more effective charge neutralization. The ex- perimental results show that sulfate has a significant effect on coagulation and promoting aggregation of hydrolyzed species for the Al13 species. It results in significant improvement of the coagulation effi- ciency through an electrostatic patch effect. The results further indicate that zeta potential of the parti- cle suspension is not the only indicator for the coagulant efficiency when precipitate formation sig- nificantly improves coagulation.The floc formation and re-aggregation potential and the effects of sulfate on coagulation by AlCl3, polyaluminum chloride (PAC), and Al13 species using a photometric dispersion analyzer (PDA) are investigated. It is found that the recovery level from shearing is the highest for the Al13 species. This is likely a result of increased collision efficiency due to more effective charge neutralization. The experimental results show that sulfate has a significant effect on coagulation and promoting aggregation of hydrolyzed species for the Al13 species. It results in significant improvement of the coagulation efficiency through an electrostatic patch effect. The results further indicate that zeta potential of the particle suspension is not the only indicator for the coagulant efficiency when precipitate formation significantly improves coagulation.

关 键 词：AL13 species COAGULATION dynamics POLYALUMINUM chloride (PAC) SULFATE 

分 类 号：O648[理学—物理化学]