4. Conclusions
While the 2R model conceptually approaches better the processes involved in bulk chlorine consumption in supply systems, namely by incorporating fast and slow decay terms, and depending less on wall decay calibration, similarly satisfactory descriptions of chlorine decay were produced with the 1st and nth order models. Hence, 2R and 1st and nth order less complex models may be successfully used alike for simulating chlorine decay in supply systems, provided that a sound calibration of wall reaction rate coefficient is performed. Accordingly, the use of the current EPANET MSX version may not be always advantageous, owing to the use of MS-DOS and the lack of a graphical interface. This limitation may be effectively overcome with the use of Epanet Java as herein demonstrated. A deeper understanding of the mechanisms underlying chlorine consumption in piped systems, namely the effect of pipe material and surface conditions, including those associated with biofilm, is still needed for a more accurate estimation of kw and chlorine decay modeling improvement.
4. Conclusions
While the 2R model conceptually approaches better the processes involved in bulk chlorine consumption in supply systems, namely by incorporating fast and slow decay terms, and depending less on wall decay calibration, similarly satisfactory descriptions of chlorine decay were produced with the 1st and nth order models. Hence, 2R and 1st and nth order less complex models may be successfully used alike for simulating chlorine decay in supply systems, provided that a sound calibration of wall reaction rate coefficient is performed. Accordingly, the use of the current EPANET MSX version may not be always advantageous, owing to the use of MS-DOS and the lack of a graphical interface. This limitation may be effectively overcome with the use of Epanet Java as herein demonstrated. A deeper understanding of the mechanisms underlying chlorine consumption in piped systems, namely the effect of pipe material and surface conditions, including those associated with biofilm, is still needed for a more accurate estimation of kw and chlorine decay modeling improvement.
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