title: Comparison study of phosphorus adsorption on different waste solids: Fly ash, red mud and ferric-alum water treatment residues.
abstract: The adsorption of phosphorus (P) onto three industrial solid wastes (fly ash, red mud and ferric-alum water treatment residual (FAR)) and their modified materials was studied systematically via batch experiments. Compared with two natural adsorbents (zeolite and diatomite), three solid wastes possessed a higher adsorption capacity for P because of the higher Fe, Al and Ca contents. After modification (i.e., the fly ash and red mud modified by FeCl3and FARs modified by HCl), the adsorption capacity increased, especially for the modified red mud, where more Fe bonded P was observed. The P adsorption kinetics can be satisfactorily fitted using the pseudo-second-order model. The Langmuir model can describe well the P adsorption on all of the samples in our study. pH and dissolved organic matter (DOM) are two important factors for P adsorption. Under neutral conditions, the maximum adsorption amount on the modified materials was observed. With the deviation from pH7, the adsorption amount decreased, which resulted from the change of P species in water and surface charges of the adsorbents. The DOM in water can promote P adsorption, which may be due to the promotion effects of humic-Fe(Al) complexes and the pH buffer function exceeds the depression of competitive adsorption.
authors.affiliation: School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: yingwang@bnu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environment, Beijing Normal University, Beijing 100875, China.
authors.forename: Yange
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Environment, Beijing Normal University, Beijing 100875, China.
authors.forename: Chanchan
authors.initials: C
authors.lastname: Shen
mesh_terms: D065966:Absorption, Physicochemical; D000537:Aluminum Oxide; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D008669:Metallurgy; D008956:Models, Chemical; D010758:Phosphorus / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D062611:Solid Waste; D010758:Phosphorus; D007501:Iron; D000537:Aluminum Oxide
keywords: Adsorption; DOM; Phosphorus; Solid wastes