Effects of load shifting on water quality in a Large Potable Water network

Mathematical analysis indicated that possibilities exist for load shifting projects on a Large Potable Water Utility (LPWU) in South Africa. The primary concern was that the load variation would have an effect on the water quality. Extensive simulation and testing aim to prove the project will not affect the water quality. In South Africa, the highest standard for drinking water is the Blue Drop award. The LPWU has received this award and strives to keep it. An investigation is launched to determine if this load shifting project would influence the quality of the drinking water. The potable water supplier adheres to the SANS 241. The investigation includes a simulation in a pumping simulation package to determine how the system would react to the changes. Results are compared to the normal operating parameters of the Water Treatment Works (WTW). Studies are done on each area of the plant. Site personnel confirmed and tests revealed that the pumped volume of water reduced during the two hours will not affect the water quality. It is established that it would be possible to use the sumps of the WTW to achieve a 20 MW load shift. The planned load shift is feasible and has no effect on any aspect of the water quality.