(87f) Choose Appropriate Scenario in Order to Improve Water Quality at EL-Rahawy Drain and the Rosetta Branch, Egypt

El-Rahawy drain is the major cause of water pollution at the Rosetta branch, where around 1.5 million m3 of primary treated wastewater are discarded daily into its water from the Abu-Rawash waste water treatment plant (WWTP) which is characterized by its high biological oxygen demand (BOD), chemical oxygen demand (COD), and total suspended solids (TSS).

Two scenarios were simulated using river pollutant (RP) modeling in order to effectively manage water quality at the Rosetta branch. The first scenario is to stop discharging the effluent from Abu-Rawash WWTP into El-Rahawy drain and change the effluent path to the desert to be used in the cultivation of woody trees.

The second scenario is to minimize contamination of surface water at El-Rahawy drain through discharging clean water from Al-Buhairi Water Canal, and improving effluent quality at the Abu-Rawash WWTP with the application of aluminum chloride (AlCl3) as a coagulant at lower pH value. By comparing the two scenarios, it was concluded that the second scenario would be more effective and less costly than the first scenario, where the negative influence of El-Rahawy drain on the Rosetta branch water quality is temporary and will end once the biological treatment units at the Abu-Rawash WWTP begin working.