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• W1992249316 abstract "The adsorption characteristics of phosphate adsorption on the dewatered alum sludge were identified as a function of pH and ion strengths in solution. In addition, adsorption mechanisms were investigated by conducting batch tests on both the hydrolysis and P-adsorption process of the alum sludge, and making a comparative analysis to gain newer insights into understanding the adsorption process. Results show that the adsorption capacity decreased from 3.5 to 0.7 mg P/g sludge when the solution pH was increased from 4.3 to 9.0, indicating that adsorption capacity is largely dependent upon the pH of the system. The results of the competitive adsorption between phosphate and typical anions found in wastewater, such as SO42− and Cl−, onto alum sludge reveal that alum sludge can selectively adsorb phosphate ions. The insignificant effect of SO42− and Cl− on P-adsorption capacity indicates that phosphate adsorption is through a kind of inner-sphere complex reaction. During the adsorption process, the decrease of phosphate concentration in solution accompanied with an increase in pH values and concentrations of SO42−, Cl− and TOC (total organic carbon) suggests that phosphate replaced the functional groups from the surface of alum sludge which infers that ligand exchange is the dominating mechanism for phosphate removal. At the same time, the simultaneous decreases in PO43− and total aluminium concentration in solution indicate that chemical reaction and precipitation are other mechanisms of phosphate removal." @default.
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• W1992249316 date "2006-09-01" @default.
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• W1992249316 title "Characteristics and mechanisms of phosphate adsorption on dewatered alum sludge" @default.
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• W1992249316 doi "https://doi.org/10.1016/j.seppur.2006.01.013" @default.
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