title: Coagulation behavior and floc properties of compound bioflocculant-polyaluminum chloride dual-coagulants and polymeric aluminum in low temperature surface water treatment.
abstract: This study was intended to compare coagulation behavior and floc properties of two dual-coagulants 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 dual-coagulants 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.
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. Electronic address: huangxin1212@163.com.
authors: Xin
authors: X
authors: Huang
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors: Shenglei
authors: S
authors: Sun
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. Electronic address: baoyugao_sdu@aliyun.com.
authors: Baoyu
authors: B
authors: Gao
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors: Qinyan
authors: Q
authors: Yue
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors: Yan
authors: Y
authors: Wang
authors: School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors: Qian
authors: Q
authors: Li
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D003080:Cold Temperature; D005427:Flocculation; D017709:Fractals; D018508:Water Purification / Q000379:methods*
chemical_list: C016213:aluminum oxychloride; D000536:Aluminum Hydroxide
keywords: Coagulation behavior; Dual-coagulants; Floc properties; Surface water