title: Phosphate removal from water by fly ash: factorial experimental design.
abstract: The influence of three variables (phophate concentration, initial pH of solution (pH(0)) and the fly ash dosage) on the removal efficiency of phosphate (% E) and equilibrium pH of solution (pH(eq)) by using fly ash was studied by means of 2(3) full factorial experimental designs. The parameters coded as x(1), x(2) and x(3), consecutively(,) were used. The parameters were investigated at two levels (-1 and 1). The effects of these factors on dependent variables, namely, % E and pH(eq) were investigated. To determine the significance of effects, the analysis of variance with 95% confidence limits was used. It was shown that % E and pH(eq) obtained in this study were found to be 99.6% and 11.16, corresponding to the operating condition of 25 mg l(-1), 2 g l(-1) and 5.5 for the phosphate concentration, fly ash dosage and pH(0), respectively.
authors.affiliation: Yildiz Technical University, Faculty of Civil Engineering, Environmental Engineering Department, 34349 Istanbul, Tukey. mcan@yildiz.edu.tr
authors.forename: Mevra Yalvac
authors.initials: MY
authors.lastname: Can
authors.forename: Ergun
authors.initials: E
authors.lastname: Yildiz
mesh_terms: D002118:Calcium / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D052638:Particulate Matter; D010710:Phosphates / Q000737:chemistry* / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D060729:Coal Ash; D007220:Industrial Waste; D052638:Particulate Matter; D010710:Phosphates; D014867:Water; D002244:Carbon; D002118:Calcium