title: Aging of aluminum/iron-based drinking water treatment residuals in lake water and their association with phosphorus immobilization capability.
abstract: Aluminum and Fe-based drinking water treatment residuals (DWTRs) have shown a high potential for use by geoengineers in internal P loading control in lakes. In this study, aging of Al/Fe-based DWTRs in lake water under different pH and redox conditions associated with their P immobilization capability was investigated based on a 180-day incubation test. The results showed that the DWTRs before and after incubation under different conditions have similar structures, but their specific surface area and pore volume, especially mesopores with radius at 2.1-5.0 nm drastically decreased. The oxalate extractable Al contents changed little although a small amount of Al transformed from oxidizable to residual forms. The oxalate extractable Fe contents also decreased by a small amount, but the transformation from oxidizable to residual forms were remarkable, approximately by 14.6%. However, the DWTRs before and after incubation had similar P immobilization capabilities in solutions and lake sediments. Even the maximum P adsorption capacity estimated by the Langmuir model increased after incubation. Therefore, it was not necessary to give special attention to the impact of Al and Fe aging on the effectiveness of DWTRs for geoengineering in lakes.
authors.affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Changhui
authors.initials: C
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
authors.forename: Nannan
authors.initials: N
authors.lastname: Yuan
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Pei
authors.affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: hljiang@niglas.ac.cn.
authors.forename: He-Long
authors.initials: HL
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D060766:Drinking Water; D010070:Oxalates; D010758:Phosphorus; D000535:Aluminum; D007501:Iron
keywords: Aging effect; Drinking water treatment residuals; Lake remediation; Phosphorus