Phosphorus sorption from aqueous solution by the thermally-treated attapulgite amended sediment
HAN Mei-xiang1,2, YIN Hong-bin2, TANG Wan-ying1
1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
In this study, the thermally-treated calcium-rich attapulgite was used as low-cost P sorbent amendments and which was added into lake sediment with different percentage. The P sorption on the material amended sediment and the sediment P fractionation were studied. The results indicated that the P sorption capacity and sorption rate were greatly enhanced with addition of the material. Specifically, the maximum P sorption capacity and sorption rate have been increased 1.5 to 2.0 times and 1.7 to 3.7times respectively with addition of 5% to 20% of material. In addition, material addition can increase the capacity of resisting disturbance of lake sediment. The interference of pH, NO3- and HCO3- on P sorption on the amended sediment has been attenuated. However, SO42- and SiO32- still exert great influence on P sorption on amended sediment. The results of P fractionation indicated that material addition can transform Al-P to Ca-P in sediment, increase the percentage of inert P and therefore low the P release into overlying from the sediment. All of the results suggested that the thermally-treated calcium-rich can be used as an effective material for lake eutrophication control.
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