CaO2 적용에 따른 퇴적물의 P fraction 변화와 수질에 미치는 영향

Abstract

This study was investigated to improve the phosphorus release and water quality by transformation of sedimentary P fraction for application of CaO2. For the experiment, 0.5% (w/w) of CaO2 was homogenized in the sediment and incubated with the control for 20 days. The analytical results showed that pH increased with CaO2 and redox potential (ORP) was improved in the sediment of the reactor. The growth rate of chlorophyll-a was lower in the CaO2 reactor and Dissolved Oxygen (DO) of overlying water maintained higher than that of the control. Total phosphorus (T-P) concentration in the overlying water increased from the initial concentration to 0.304mg/L in the control at 20 days. The reactor of CaO2 was lowered by 29.3%. Ex-P, Fe-P and Ca-P in sediment P fraction were increased with the CaO2. The formation of bound Fe-P and Ca-P in the sediments seemed to control the release of P by removing the Soluble Reactive Phosphorus (SRP) presented in the pore water. From the result, this indicated that the reduction of P release from the sediments seems to be effective in suppressing the eutrophication of P and improving the oxygen condition in the water quality with the application of CaO2.