Aluminum-salt inactivating agents are extensively applied to the restoration of lakes polluted by internal phosphorus (hereinafter referred to as "P"). However, there is a lack of micromechanism information regarding the sediment P cycle and its interactions with aluminum salts, which has restricted the engineering applications of aluminum salts. In this study, a sediment core incubation system was used to simulate the influence of aerobic and anaerobic conditions on the effectiveness and stability of aluminum-modified clay (AMC). This study also investigated the millimeter-scale dynamics of P across the sediment-water interface (SWI) using the HR-Peeper and DGT techniques. According to the results, sediment P release mainly occurred under anaerobic conditions. When the incubation system was in an anaerobic state, AMC effectively reduced the internal-P loading. In pore water, there was a positive correlation between soluble Fe and SRP, suggesting that the reductive dissolution of Fe-P constituted the main mechanism of sediment P release. After with dosing AMC, the concentrations of SRP and labile P in the capping layer both dropped abruptly to low levels and the content of Al-P in surface sediments rose, suggesting that AMC had strongly adsorbed phosphates, formed inert Al-P and blocked the phosphate exchange between pore water and overlying water. This study elaborated on the micromechanism of the control of sediment internal P input by AMC and revealed that Al-P precipitation constituted the main mechanism of the inhibition of sediment P release by aluminum-salt inactivating agents. The research findings have a great significance for guiding field applications of aluminum-salt inactivating agents.
1.University of Chinese Academy of Sciences, College of Resources and Environment, Beijing, 100049, PR China 2.College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, PR China 3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, PR China
推荐引用方式 GB/T 7714
Jingfu Wang;Jingan Chen;Quan Chen;Haiquan Yang;Yan Zeng;Pingping Yu;Zuxue Jin. Assessment on the effects of aluminum-modified clay in inactivating internal phosphorus in deep eutrophic reservoirs[J]. Chemosphere,2019,215:657-667.
APA
Jingfu Wang;Jingan Chen;Quan Chen;Haiquan Yang;Yan Zeng;Pingping Yu;Zuxue Jin.(2019).Assessment on the effects of aluminum-modified clay in inactivating internal phosphorus in deep eutrophic reservoirs.Chemosphere,215,657-667.
MLA
Jingfu Wang;Jingan Chen;Quan Chen;Haiquan Yang;Yan Zeng;Pingping Yu;Zuxue Jin."Assessment on the effects of aluminum-modified clay in inactivating internal phosphorus in deep eutrophic reservoirs".Chemosphere 215(2019):657-667.
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