Abstract
Effects of Quantitative Changes on Drinking Water Quality Indicators of Urban Distribution Networks ION MIREL1, CONSTANTIN FLORESCU1, ALINA GIRBACIU1, CRISTIAN GIRBACIU1, PAVEL DUMITRU1, SORIN DAN2, RAMONA AMINA POPOVICI3*, GEORGE-LUCIAN IONESCU4 1 Politehnica University of Timiºoara, Civil Engineering Faculty, Hydrotechnical Engineering Department, 1A George Enescu Str., 300022, Timiºoara, Romania 2 Politehnica University of Timiºoara, Civil Engineering Faculty, Civil Engineering and Building Services Engineering Department, 2 Traian Lalescu Str., 300223, Timiºoara, Romania 3 “Victor Babes” University of Medine and Pharmacy Timisoara, 2 Eftimie Murgu Sq., 300041, Timisoara, Romania 4 University of Oradea, Faculty of Constructions and Architecture, 4 Barbu Stefanescu Delavrancea Str., 410058, Oradea, Romania In this paper are shown quantitative and qualitative changes in the drinking water distribution system, occurring in an urban locality with about 200 000 inhabitants in which water consumption over the past decade have been reduced by 50%. In relation to consumer debts are highlighted oscillations related to water pressure in the system and residual chlorine concentration on pressure zones. Hydraulic modeling of the water distribution system was performed using computer programming software, EPANET type, program that performs hydraulic simulations and water quality in pressure pipeline network. After analyzing and interpreting the results of hydraulic simulations performed in different operational situations (consumption 100; 75; 50%) resulted in areas where residual chlorine levels fall well below the limits imposed by the laws and regulations in force. In this situation are required corrective measures on water quality by reducing or eliminating water stagnation by increasing the velocity of the water circulation pipe sections affected. The book is useful for units or operators that use water networks in areas with significant debt fluctuations where by reducing travel speeds on sections of pipeline in areas where residual chlorine drops below the limits, favoring the formation of ecosystems biological and thereby triggering internal processes of auto-pollution reflected in the degradation of water supplied to consumers. Keywords: disinfection, residual chlorine, stagnation, water demand, pressure