title: Variation of physicochemical properties of drinking water treatment residuals and Phoslock(®) induced by fulvic acid adsorption: Implication for lake restoration.
abstract: The use of phosphorus (P) inactivating agents to reduce internal P loading from sediment for lake restoration has attracted increasing attention. Reasonably, the physicochemical properties of P inactivating agents may vary with the interference of various environmental factors, leading to the change of control effectiveness and risks. In this study, the effect of fulvic acid (FA) adsorption on the properties of two agents, drinking water treatment residuals (DWTRs) and Phoslock®, was investigated. The results showed that after adsorption, there was little change for the main structures of DWTRs and Phoslock®, but the thermostability of Phoslock®, as well as the particle size and settleability of the two agents decreased. The specific surface area and pore volume of DWTRs also decreased, while those of Phoslock® increased. Further analysis indicated that aluminum and iron in DWTRs were stable during FA adsorption, but a substantial increase of lanthanum release from Phoslock® was observed, in particular at first (P < 0.01). Moreover, the P immobilization capability of DWTRs had little change after FA adsorption, while the capability of Phoslock® after FA adsorption decreased in solutions (P < 0.001) and sediments (P < 0.1); interestingly, from the view of engineering application, the performance of Phoslock® was not substantially affected. Overall, each P inactivating agent had its own particular responses of the physicochemical properties to environment factors, and detailed investigations on the applicability of each agent were essential before practical application.
authors: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
authors: Changhui
authors: C
authors: Wang
authors: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China. hljiang@niglas.ac.cn.
authors: He-Long
authors: HL
authors: Jiang
authors: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
authors: Huacheng
authors: H
authors: Xu
authors: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
authors: Hongbin
authors: H
authors: Yin
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry; D001578:Benzopyrans / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry; D007700:Kinetics; D060106:Lakes / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001578:Benzopyrans; D060766:Drinking Water; D010758:Phosphorus; D007811:Lanthanum; D000535:Aluminum; C005023:fulvic acid
keywords: Adsorption; Fulvic acid; Internal phosphorus loading; Lake; Phosphorus inactivating agent