TY - JOUR AU - Darweesh, Moustafa S PY - 2018/07/31 Y2 - 2024/03/28 TI - Impact of variable speed pumps on water quality in distribution systems JF - Water SA JA - WSA VL - 44 IS - 3 July SE - Research paper DO - 10.4314/wsa.v44i3.09 UR - https://watersa.net/article/view/6616 SP - AB - <p>Water quality has become a prominent issue in the study of water distribution networks. Variable speed pumps (VSPs) can&nbsp;control and improve the performance of water distribution systems. However, they may have effects on the water quality.&nbsp;The objective of this study was to investigate the impact of VSPs on water quality. The EPANET water quality simulator&nbsp;was applied for modelling water age and chlorine residual in a distribution network. In addition, intrusion of an active&nbsp;contaminant and analysis of leakage effects on residual chlorine concentration were performed through extended period&nbsp;simulations. Results indicate that VSPs may have negative impacts on water quality, including increased water age during low&nbsp;consumption times, and reduced disinfectant residuals at peak hours. In addition, the average rate of chlorine decay for fixed&nbsp;speed pumps (57%) is higher than that for VSPs (54%) when a conservative contaminant (sewage water) is considered.</p> ER -