터널 폐수처리를 위한 일체형 고속응집 침전장치의 적용

Abstract

The objective of this study was to evaluate the mechanism and removal efficiency of turbidity using Packaged Inclined Claifier with Accelerating Flocculation(PICAF) for the treatment of tunnel wastewater. From the experimental results of this study, the characteristics of coagulation in the reaction part and the characteristics of particle removal in the settling par showed as follows: According to the result of jar-test and LS-PICAF, the optimum alum and polymer dosage for removing turbidity applied for the coagulation process was 20㎎/L and 0.2㎎/L respectively. When comparing the settling efficiency, backmixer was more effective than LS-PICAF for the coagulation-sedimentation process. In addition, the most effective pH range for the removal of turbidity was found to be pH 7.0~9.0. The morrill index and modal index from cone and baffle conditions for the reaction in PICAF showed 4.34 and 0.91, respectively, and it can be concluded that the cone and baffle will be effective for coagulation-sedimentation process. Therefore, this PICAF process is the best process for the treatment of tunnel wastewater.