where C is chlorine concentration, kb is the bulk decay rate coefficient and n is the order of the reaction with respect to chlorine. First order bulk decay is a particular case of nth order kinetics with respect to chlorine. It has been extensively used in the simulation of chlorine decay in water supply systems (Rossman et al., 1994). Several authors have reported that this kinetic approach is not frequently the most accurate for describing bulk decay and, therefore, a number of alternative models have been proposed (Clark, 1998; Jonkergouw et al., 2009; Kastl et al., 1999). Recently, Fisher et al. (2011a) reported on a two reactant (2R) second order model as the most simple and generally suitable model for simulating chlorine concentration profiles in distribution system networks. The model assumes that chlorine reacts with two groups of water compounds, one reacting rapidly and the other reacting slowly:
(
where C is chlorine concentration, kb is the bulk decay rate coefficient and n is the order of the reaction with respect to chlorine. First order bulk decay is a particular case of nth order kinetics with respect to chlorine. It has been extensively used in the simulation of chlorine decay in water supply systems (Rossman et al., 1994). Several authors have reported that this kinetic approach is not frequently the most accurate for describing bulk decay and, therefore, a number of alternative models have been proposed (Clark, 1998; Jonkergouw et al., 2009; Kastl et al., 1999). Recently, Fisher et al. (2011a) reported on a two reactant (2R) second order model as the most simple and generally suitable model for simulating chlorine concentration profiles in distribution system networks. The model assumes that chlorine reacts with two groups of water compounds, one reacting rapidly and the other reacting slowly:
(
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