“Computational Civil Engineering - "Intersections" International Journal

274Em. Barsan, A. IgnatIt is presented an example, the findings and conclusions for the utilization ofproposed procedure2. ADOPTED MODEL [1]Chlorine, introduced in distribution network as disinfectant, is transported along apipeline by advection with water average velocity from respective pipeline.Chlorine reaction is of first order (of type C downstream = C upstream exp(-kt))) Atjunctions of two or more pipes , the water mixing is assumed to be complete andinstantaneous. Chlorine concentration that leaves/goes out from junction isweighted average through the flow rates of concentrations that have entered thejunction. For tanks, a complete mixing is considered (concentration in tank resultsfrom mixing of entered water, of the one from tank and of reactions that take placein tank volume). Chlorine introduction in the distribution network is done in anumber of injection booster stations. The choosing of stations for chlorineinjections may be done randomly or by imposing some nodes by modeler. With anumber of imposed simulations it is established the minimum chlorine quantitynecessary in 24 hours and the stations (nodes) from which it is managed so that atthe water consuming nodes, the chlorine concentration to join in the limitsspecified by Law 458/2002 (0.2 mg/L < c < 0.5 mg/L). On the base of personalprogram concerning the hydraulic analysis and the chlorine concentrationestablishing at nodes and by means of some dialog windows there are introducedthe necessary data and the obtained results are displayed tabular and/orgraphically, that consist in the locations for chlorine injection booster stations, thenecessary chlorine for the injection at each location and chlorine concentrations atnodes for minimum total chlorine consumption in 24 hours.3. EXEMPLEThere is considered the network from fig.1. The network is supplied in the node 1by a pumping station but in 11 node is supplied by 12 tank. The waterconsumptions in network on an extended period of 24 hours are given in table 1.