title: [Coagulation performance and mechanism of Alb species in polyaluminum chloride in removing humic acid].
abstract: Alb species [Al12 AlO4 (OH)24(7+)] is multinuclear hydroxyl compound formed in PAC hydrolysis-polymerization process, with properties of small particle sizes, much positive charge, high aggregation degree and large molecular weight. Alb species was purified from PAC containing high concentration of Alb species using ethanol-acetone mixed precipitation method. The influence of dosage, pH and inorganic ions on humic acid removal from simulative water was studied by measuring zeta potential and UV254. The PDA output (FI curve) was analyzed and the relationship between the parameters (S1, S2, H1, H2) of FI curve and coagulation mechanism were studied at different Alb dosage and pH. When the dosage was 4.3 to 6.3 mg x L(-1) and pH was 3.0 to 6.0, the highest humic acid removal efficiency was obtained. The existence of NH4+, SiO3(2-) and H2PO(-) inhibits the coagulation performance. The results of coagulation kinetics and Zeta potential studies revealed that Alb acted mainly by charge neutralization as well as adsorption bridge building in water treatment.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China. xiumingxu0509@126.com
authors.forename: Xiu-Ming
authors.initials: XM
authors.lastname: Xu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Gao
authors.forename: Wei-Ying
authors.initials: WY
authors.lastname: Xu
authors.forename: Xiao-Biao
authors.initials: XB
authors.lastname: Zhu
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D011232:Chemical Precipitation; D006812:Humic Substances / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D006812:Humic Substances; D014874:Water Pollutants, Chemical; C016213:aluminum oxychloride; D000536:Aluminum Hydroxide