수산화칼슘과 황산제일철을 이용한 중금속 오염토양의 고화제 개질

The purpose of this study was to derive operational parameters by predicting the effect of mixed diffusion by operating the pilot-scale device’s impeller applied to the actual lake. This device is installed to prevent the eutrophication of the reservoir due to the occurrence of algae. The diffusion mixer’s impeller of this study has the function of raising the lower water and diffusing to the atmospheric contact and water surface by the jet flow at the water surface, and it is manufactured with a diameter of 700 mm. In this study, the multi-phase flow analysis technique was applied and the operating characteristics of the impeller were predicted under the steady state conditions and the influence radius was predicted under the un-steady condition.
The maximum velocity of the impeller was about 6.78 m/s. The height and velocity vector of the free surface generated by the impeller showed a increase in the pressure level of the wing and a decrease in the water level on the suction side. The discharge flow rate was directly proportional to rpm, and the discharge amount and energy efficiency of the mode conversion were the same.
Also, after 3 minutes from the operation of the water circulator, the radius of influence was 40 m. After 13 minutes, the free surface was spread about 90 m and the radius of influence was increased to about 40 m below the free surface.