title: Removal of pollutants by enhanced coagulation combined PAC with variable charge soils: flocs' properties and effect of pH.
abstract: This study investigated the properties of flocs and effects of the solution pH on removal of representative pollutants by enhanced coagulation with variable charge soils of South China and polyaluminum chloride (PAC). The results demonstrated that the removal efficiency of turbidity was larger and the aggregated flocs had a faster growth rate, bigger size, denser structure and faster settling rate than those generated by PAC alone, when variable charge soil was used in conjunction with PAC. Additionally, initial solutions pH had meaningful effects on removal of pollutants. With the increase in the pH of the solution, the removal efficiencies of turbidity, algae and heavy metal ions significantly increased. Besides, charge neutralization together with physical entrapment of colloids was the dominant mechanism in enhanced coagulation, and variable charge soil displayed a great adsorption effect.
authors.affiliation: a School of Environment and Energy , South China University of Technology , Guangzhou , People's Republic of China.
authors.forename: Yu-Jie
authors.initials: YJ
authors.lastname: Wang
authors.affiliation: a School of Environment and Energy , South China University of Technology , Guangzhou , People's Republic of China.|b The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education , Guangzhou , People's Republic of China.
authors.forename: Chun-De
authors.initials: CD
authors.lastname: Wu
authors.affiliation: a School of Environment and Energy , South China University of Technology , Guangzhou , People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Duan
authors.affiliation: a School of Environment and Energy , South China University of Technology , Guangzhou , People's Republic of China.
authors.forename: Zhi-Lin
authors.initials: ZL
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants
keywords: Enhanced coagulation; PAC; flocs property; removal; variable charge soil