부유성 흡착제인 발포질석의 표면개질을 통한 인공폐수의 인 제거 연구

Abstract

This study evaluated whether phosphorus in an aqueous solution can be effectively adsorbed and removed by sulfate-modified vermiculite (SV), which was manufactured heating a mixture of expanded vermiculite (EV) and surfuric acid at 300℃. Phosphorus was removed from the aqueous solution and removal characteristics were evaluated batch kinetic batch sorption, and column tests. The phosphate removal rates (Kobs, h-1) of batch kinetic tests for 1, 2.5, 5, 7.5, 12.5 and 25 g/L of SV were 0.00015 0.0011 0.0044 0.0087, 0.0648 and 0.5002, respectively. The phosphate removal rates (Kobs, h-1) of batch kinetic tests for 10, 20, 30, 40 and 50 mg/L of SV were 0.549 0.377, 0.208 0.065 and 0.032, respectively. The Qmax of the Langmuir model and the partition coefficients of the linear and Freundlich models were 8.921 mg/g, 0.6544 L/g, and 4.5974 L/g (1/n = 0.354), respectively. The equilibrium phosphate sorption capacity(qe) obtained from the column test at the flow rate of 5 mL/min were 7.47, 14.69 and 19.53 mg/g at the initial concentrations of 10, 25 and 50 mg/L, respectively. And, the equilibrium phosphate sorption capacity(qe) obtained from the column test at the initial concentration of 25 mg/L were 16.63, 14.69 and 13.14 mg/g at the flow rates of 3, 5 and 7 mL/min, respectively. These results show that SV can efficiently adsorb phosphate in an aqueous solution.