Effects Residence Time to Water Quality in Large Water Distribution Systems

Hossein Shamsaei,Noor Ezlin Ahmad Basri,Othman Jaafar

doi:10.4236/eng.2013.54054

Abstract

Systems that have big transmission line may have problem on changes of pressure in the distribution system. Because the increase in water age is dependent on the difference between the production and consumption rates, high residence time in pipes and storage duration in water tanks. The goal of this study is to analyze the effects residence time to water quality in large water distribution systems. According to the results in Ahwaz, bacterial growth (HPC) has a direct relationship with water age, and changing rate of the bacterial growth (HPC) and the distance travelled and residence time have been caused to increase water age, bacterial growth (HPC), chlorine consumption and hydraulic change. So bacterial growth (HPC) doesn’t have any relationship with THMs and Tol Coli form, but has a reversed relationship with residual chlorine nearly.

Highlights

Human seek to drink clear water without bacteria
One could say that their conclusion is that the main cause of poor water quality in distribution systems has been water aging. [19] did a study about analyses of the interactions of water residence time with heterotrophic plate count (HPC), and these results have demonstrated the different influences of residence time in reservoirs and in pipes on bacterial water quality
The common notion that biofilms dominate the distribution system is not true under all conditions. These findings suggest that bulk water bacteria may dominate in portions of a distribution system that have low chlorine residual

Summary

Introduction

Human seek to drink clear water without bacteria. In ancient days, human societies have had ways for water treatment that were successful. In the big distribution systems, the problem could affect water quality. The problems of quantity are basic agents in the decay of water quality in distribution systems. Another effect is that of water age [1]. Water age could be due to over designs, especially during the initial phase of the project that has been designed for 20 - 30 years. They could cause problems for water quality in the water utility. The effects of undesirable pressure in the water distribution according to [3], may include corro-

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Discussion

Conclusion