Evaluation of Pilot scale Coagulation system Design for CSOs treatment

CSOs 처리를 위한 실증규모 응집침전시스템의 설계평가

  • Lee, Seung-Chul (Department of Urban Engineering, Chungbuk National University) ;
  • Ha, Sung-Ryong (Department of Urban Engineering, Chungbuk National University)
  • 이승철 (충북대학교 도시공학과) ;
  • 하성룡 (충북대학교 도시공학과)
  • Received : 2011.11.07
  • Accepted : 2013.02.15
  • Published : 2013.02.28


A pilot scale coagulation system, which has a function of physicochemical treatment, was developed to treat Combined sewer overflows(CSOs). This coagulation system requires evaluation of optimum design factors whether it has reflected those of lab scale system, moreover, the pilot scale system can be evaluated differently according to the characteristics of influent CSOs even though it has reflected lab scale's design factors. We conducted an experiment using lab scale system that could treat $1m^3$ of CSOs in a day, and also pilot-scale system with $100m^3/day$ CSOs flowed into the Cheongju sewage treatment plant. Therefore the aim of this study is to evaluate a hydraulic similarity between the design factors of pilot scale and those of lab scale coagulation system, and to evaluate feasibility of the coagulation system for the CSOs treatment with optimum operation conditions. From the result of pilot-test, we drew the optimum operation factors of in line mixer and flocculator having similarities with those of lab scale system as well as the optimum coagulant dose. Finally we confirmed that the coagulation system has feasibility to treat the CSOs with high removal efficiency.


Coagulation system;Combined Sewer Overflows;Design factors;Hydraulic similarity;Scale up


Supported by : 한국연구재단


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