Water Quality Management Scenarios in Rosetta River Nile branch

The increase in population, urbanization and industrialization put a pressure on water resources management. Discharges from untreated wastewater cause serious surface water quality problems. Scenarios for water management in River Nile Rosetta branch are presented to describe the status and trends of water quality. The different scenarios were simulated using QUAL2K water quality model. Two different scenarios are proposed and assessed to avoid water quality deterioration in the Rosetta branch during the low demand period. The first is based on dilution approach to dilute the organic loads and to achieve the local guidelines regarding water quality. The second scenario is to divert the wastewater from Abo Rawash WWTP to dessert lagoons and reuse it for wooden trees. It was concluded that the second scenario reduced the concentrations of Ammonia and organic-Nitrogen and made it comply with the local guidelines at the water supply intakes. This scenario was the best environmental and economical sound solution. This indicates that the reuse of wastewater from Abo Rawash WWTP in irrigation can solve the high ammonia concentration problem, which arises every year and also can save about 0.9 billion m3 per month in the low demand period and also improve the water quality