Chen, Home-MingHome-MingChenSHANG-LIEN LO2012-10-162018-06-282012-10-162018-06-282010http://ntur.lib.ntu.edu.tw//handle/246246/242763Metropolitan Taipei located in north Taiwan uses a hybrid sewer system consisting of mostly separate sewer for the populated regions, and partly combined sewer for less populated regions. This study used the concept that Marginal Cost of Control (MCC) equals to Marginal Benefits of Control (MBC) to establish the method for studying the optimal household connection percentage, and the most cost-effective construction of the separate sewer in the hybrid sewer system. Results indicate the improvement of the receiving water quality in a cost-effective analysis manner. The most cost-effective sanitary sewer construction can be reached when the stream Biochemical Oxygen Demand (BOD 5) meets the river quality standard, which can be applied in other cities and existing systems. © IWA Publishing 2010.en-US[SDGs]SDG11Household connection percentage; Hybrid sewer system; Marginal benefit; Marginal costs; Separate sewer; Biochemical oxygen demand; Combined sewers; Cost effectiveness; Costs; Economic analysis; Optimization; Oxygen; Water pollution; Water quality; Cost benefit analysis; biochemical oxygen demand; cost-benefit analysis; economic analysis; metropolitan area; optimization; river water; sewage treatment; sewer network; water quality; article; biochemical oxygen demand; cost effectiveness analysis; economic aspect; household; quality control; sewer; water quality; Reproducibility of Results; Sewage; Taiwan; Time Factors; Waste Disposal, Fluid; Water Pollutants, Chemical; Taipei; Taiwanjournal article10.2166/wst.2010.527http://ntur.lib.ntu.edu.tw/bitstream/246246/242763/-1/126.pdf