1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; 2. Jiangsu Water Resources Service Center, Nanjing 210029, China; 3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, People's Republic of China, Nanjing 210008, China
Abstract:The commercial phosphorus inactivation material-Phoslock® was used to investigate its efficiency for sorption isotherm and kinetics. In addition, the control effects on P concentration in overlying water and sediment internal P release was also investigated. The results indicated that P sorption on Phoslock can be fitted well by Langumiur model with a coefficient of 0.996 and the maximum P sorption capacity was estimated to be 10.6mgP/g. P sorption on phoslock can be fitted well by second-order kinetic model. The results of laboratory incubation indicated that the soluble reactive phosphate in overlying water and sediment internal P release can be reduced by more 90% and 80% respectively with a dosage of 1553g/m3 during seventy day of incubation (17days of aerobic and 53days of anaerobic incubation).Unfortuately, the addition of phoslock can induce an elevation of total nitrogen, ammonium nitrogen and nitrate in overlying water. P fractionation analysis indicated that the addition of phoslock can transform more than 50% of mobile P and Al-P into stable Ca-P and Res-P. The control effects can be increased with the increase of dosage of Phoslock. Overall, the results indicated that Phoslcok can effectively control sediment internal phosphorus loading, but the long-term effects still should be studied further.
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