Abstract
One of the parameter that could reason to decrease water quality in distribution system is velocity change in networks. This study is to analyze the effects velocity changes on the water quality in water distribution systems. We need to choose different locations that will be water quality and quantity relative too much. Location of the study has been in Ahwaz of Iran. There are two instances for the conduct of this analysis, local environment and Laboratory condition and this analysis had been done independently as far as the plants are concerned. The results showed that the distance travelled and residence time have been causing to increase bacterial growth (HPC), hydraulic change in water distribution system in Ahwaz so, velocity has a reversed relationship with bacterial growth (HPC). Velocity change has been causing to increase bacterial growth (HPC) so change Velocity has a direct relationship with residual chlorine. Velocity change has been causing to increase chlorine consumption more. Also, Kw hasn't any relationship with change velocity and bacterial growth (HPC) and change Velocity has a direct relationship with turbidity with the aid of the diagrams and Figures, the results of station sampling in the water distribution systems of Ahwaz have shown that the systems have large transmission line and have extensive networks.
Highlights
One of the parameter that could reason to decrease water quality in distribution system is velocity change in network
Many researchers have been carried out about affects velocity change in the water quality in distribution systems, high residence time could cause decay of water quality as it had been responsible for increment in the rate of bacteria growth”
Codonya et al (2005) the systems with vast transmission lines, high water residence time and long distance travelled that high velocity changes have increased DBPs
Summary
One of the parameter that could reason to decrease water quality in distribution system is velocity change in network. High velocity flow rates, velocity changes in the distribution systems, that reasons for changes in velocity in the system has been about the lack of careful designing, the height level of the flow in the system, the opening and closing the valves had effects on cross-connections, so that the hydraulics in water distribution systems have given cause for increased bacteria growth They went further to say that the effects of hydraulics and bacteria growth on biofilm haven’t been related and that many parameters involve pipe design, high velocity flow rates and conditions of terminal demands. With due attention to problems of water quality and quantity in distribution, This study is to analyze the effects velocity changes on the water quality in water distribution systems
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