where Cf and Cs are, respectively, the concentrations of fast and slow reducing agents in the water that react with chlorine (as mg Cl-equivalent/L) and kf and ks are decay rate coefficients for fast and slow reactions (L/mg Cl/h). The model requires the estimation of four parameters, namely the reaction rate coefficients and initial concentrations of Cf and Cs, which can be inferred from laboratory decay tests data. Although the model has very accurately described chlorine decay in a several decay tests, its performance has not previously been confirmed for full scale water supply systems. For wall decay in non-metallic pipes, a first order kinetic model is generally used (Rossman et al., 1994; Vasconcelos et al., 1997):
(3)
where Cf and Cs are, respectively, the concentrations of fast and slow reducing agents in the water that react with chlorine (as mg Cl-equivalent/L) and kf and ks are decay rate coefficients for fast and slow reactions (L/mg Cl/h). The model requires the estimation of four parameters, namely the reaction rate coefficients and initial concentrations of Cf and Cs, which can be inferred from laboratory decay tests data. Although the model has very accurately described chlorine decay in a several decay tests, its performance has not previously been confirmed for full scale water supply systems. For wall decay in non-metallic pipes, a first order kinetic model is generally used (Rossman et al., 1994; Vasconcelos et al., 1997):
(3)
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