Coagulation behavior and floc properties of compound bioflocculant–polyaluminum chloride dual-coagulants and polymeric aluminum in low temperature surface water treatment

作     者：Xin Huang Shenglei Sun Baoyu Gao Qinyan Yue Yan Wang Qian Li 

作者机构：School of Environmental Science and Engineering Shandong University 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2015年第27卷第4期

页      面：215-222页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the National High Technology Research and Development Program (863) of China (No. SQ2009AA06XK1482412) the Independent Innovation Foundation of Shandong University (No. 2010TS070) 

主　　题：Coagulation behavior Floc properties Dual coagulants Surface water 

摘      要：This study was intended to compare coagulation behavior and floc properties of two dualcoagulants polyaluminum chloride–compound bioflocculant（PAC–CBF）（PAC dose first） and compound bioflocculant–polyaluminum chloride（CBF–PAC）（CBF dose first） with those of PAC alone in low temperature drinking water treatment. Results showed that dualcoagulants could improve DOC removal efficiency from 30% up to 34%. Moreover, CBF contributed to the increase of floc size and growth rate, especially those of PAC–CBF were almost twice bigger than those of PAC. However, dual-coagulants formed looser and weaker flocs with lower breakage factors in which fractal dimension of PAC–CBF flocs was low which indicates a looser floc structure. The floc recovery ability was in the following order：PAC–CBF 〉 PAC alone 〉 CBF–PAC. The flocculation mechanism of PAC was charge neutralization and enmeshment, meanwhile the negatively charged CBF added absorption and bridging effect.