• Title/Summary/Keyword: Pipe Wall Decay Coefficients

Search Result 1, Processing Time 0.015 seconds

Modeling Residual Chlorine and THMs in Water Distribution System (배급수계통에서 잔류염소 및 THMs 분포 예측에 관한 연구)

  • Ahn, Jae-Chan;Lee, Su-Won;Rho, Bang-Sik;Choi, Young-Jun;Choi, Jae-Ho;Kim, Hyo-Il;Park, Tae-Jun;Park, Chang-Min;Park, Hyeon;Koo, Ja-Yong
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.29 no.6
    • /
    • pp.706-714
    • /
    • 2007
  • This study suggested a method for prediction of residual chlorine and THMs in water distribution system by measurement of residual chlorine, THMs, and other parameters, estimation of chlorine decay coefficients and THM formation coefficients, and simulation of water qualities using pipe network analysis. Bulk decay coefficients of parallel first-order were obtained by bottle tests, and pipe wall decay coefficients of first-order were estimated through evaluation of 5 models, which showed the lowest values of 0.03 for MAE(mean absolute error) and 0.037 MAE in comparison with the observed in field. And bottle tests were conducted to model first-order reaction of THM formation by nonlinear least square regression and the resultant coefficients were compared with the observed in field. As a result, the coefficients of determination$(R^2)$ for the observed and the predicted values were 0.98 in September and 0.82 in November, and the formation of THMs was predicted by modeling.