title: The performance of enhanced coagulation for treating slightly polluted raw water combining polyaluminum chloride with variable charge soil.
abstract: The feasibility and effectiveness of treating pollutants in slightly polluted raw water by variable charge soil and polyaluminum chloride (PAC) was investigated. Removal efficiencies of turbidity, phenol, aniline, algae and heavy metals (Cu(2+), Zn(2+) and Pb(2+)) were used to evaluate the coagulation performance. The results indicated that the addition of variable charge soil as a coagulant aid is advantageous due to the improvement of removal efficiencies. The tests also demonstrated that the presence of variable charge soil increased the removal of turbidity rather than adding residuary turbidity. The use of variable charge soil produced settleable flocs of greater density and bigger size. The main mechanism involved in the PAC coagulation was supposed to be sweep flocculation as well as charge-neutralization. Variable charge soil played a promoted aid role by adsorption in the enhanced coagulation process. It is concluded that the enhanced coagulation by PAC and variable charge soil, as coagulant and adsorbent, is more effective and efficient than traditional coagulation.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: ppchdwu@scut.edu.cn.
authors.forename: Z L
authors.initials: ZL
authors.lastname: Zhang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: ppchdwu@scut.edu.cn; The Key Laboratory of Pollution Control and Ecosystem Restoration, Industry Clusters of Ministry of Education, Guangzhou 510006, China.
authors.forename: C D
authors.initials: CD
authors.lastname: Wu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: ppchdwu@scut.edu.cn.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Wang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: ppchdwu@scut.edu.cn.
authors.forename: J C
authors.initials: JC
authors.lastname: Tang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: ppchdwu@scut.edu.cn.
authors.forename: Y P
authors.initials: YP
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000814:Aniline Compounds / Q000302:isolation & purification; D004787:Environmental Pollution; D005240:Feasibility Studies; D005427:Flocculation; D019216:Metals, Heavy / Q000302:isolation & purification; D019800:Phenol / Q000302:isolation & purification; D012987:Soil; D014867:Water; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D019216:Metals, Heavy; D012987:Soil; D014874:Water Pollutants, Chemical; D014867:Water; C016213:aluminum oxychloride; D019800:Phenol; D000536:Aluminum Hydroxide; C023650:aniline