title: Fractionation of residual Al in natural water treatment from reservoir with poly-aluminum-silicate-chloride (PASiC): effect of OH/Al, Si/Al molar ratios and initial pH.
abstract: An aluminum fractionation study was conducted for a surface reservoir water treatment to understand the performance of poly-aluminum-silicate-chloride (PASiC) in terms of the residual Al fractions as a function of initial pH. The coagulation performance expressed as turbidity and organic matter removal was established as supporting data. Some extra data were evaluated in terms of the residual Al ratio of the composite PASiC coagulant. The main residual Al sources were the Al fractions derived from the use of PASiC. The turbidity and organic matter removal ability was optimal at initial pH 6.00-7.00, while the concentrations of various residual Al species and the residual Al ratio of PASiC were minimal at an initial pH range of 7.00-8.00. Under the conditions of OH/Al molar ratio = 2.00 and Si/Al molar ratio = 0.05, PASiC had superior coagulation performance and comparatively low residual Al concentrations. The Al fraction in the composite PASiC coagulant seldom remained under such conditions. Experimental data also indicated that the suspended (filterable) Al fraction was the dominant species, and organic-bound or organo-Al complex Al was considered to be the major species of dissolved Al in water treated by PASiC coagulation. Additionally, the dissolved inorganic monomeric Al species dominated the dissolved monomeric Al fraction.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji' nan 250100, China. yangzhonglian@mail.sdu.edu.cn
authors.forename: Zhonglian
authors.initials: Z
authors.lastname: Yang
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Zhao
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D000538:Aluminum Silicates / Q000737:chemistry*; D011232:Chemical Precipitation; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D014881:Water Supply / Q000032:analysis*
chemical_list: D000538:Aluminum Silicates; D006878:Hydroxides; D014874:Water Pollutants, Chemical; C533809:polyaluminum silicate chloride; C031356:hydroxide ion; D000535:Aluminum; D012825:Silicon