A. Musz-Pomorska1, M. K. Widomski1, A. Pyła1,2
1) Lublin University of Technology, Faculty of Environmental Engineering, Lublin, PL; 2) Lublin University of Technology, Lublin, PL


Tap water delivered to customers should meet the drinking water requirements determined by EU and Polish biding law (Dz. U. UE – L 260/6 of 7.10.2015 and Dz. U. 2015 poz.1989). Assuring the proper qualitative parameters of drinking water requires the necessary control of water quality along all length of distribution system, selection of proper methods of water treatment, application of suitable piping materials as well as countermeasures in case of water quality deterioration, i.e. performing permanent or periodical disinfection. The aim of this paper is to analyze chlorine distribution in rural water supply system. Our studies were based on numerical hydraulic model of the studied network developed in Epanet 2.0 modeling software. The first order chlorine decay reaction was assumed to modeling studies, with applied literature values of decay rate in water mass kb = 0.09 h-1 and in boundary layer kw = 0.041 h-1. It was also assumed that chlorine in dose of 0.3 mg·dm-3 was introduced to the network during time duration of simulation. Additionally, the simulations of water age for various variants of water supply network operation were performed. Time duration assumed for modeling of chlorine decay was equal to 120h and for water age analysis 480h. The obtained results of chlorine decay simulation showed that even after 5 days there were observed pipelines in which the observed calculated concentration of free chlorine was lower than 0.01 mg/dm3. Thus, the required microbiological protection of water quality in these pipelines is unavailable. The determined water age in the studied rural network was in age from 12 hours in water supply station to over 192 hours in the end parts of the system.

Keywords: water age, chlorine distribution in water