ALUM vs. ALUMINIUM CHLORIDE FOR WATER TREATMENT AT DIFFERENT OPERATION CONDITIONS
Keywords:
Alum, aluminum chloride, conventional treatment, Nile water, optimum doses and turbidity removalAbstract
The aim of the present work is to compare between the alum and aluminum chloride as a coagulant in water treatment process in order to replace the alum, which used for a century in the water treatment process, by aluminum chloride as a coagulant for water treatment of Nile water. Aluminum chloride is the coagulant of choice for many industrial and sanitary wastewater treatment applications, due to its highly efficiency and effectiveness in clarification. The dose of both alum and aluminum chloride were developed and evaluated at different operation conditions. Bench-scale jar tests that simulated conventional coagulation, flocculation, and sedimentation processes were used. Turbidity, pH, residual aluminum and other different parameters were selected for best achievements.
The optimum doses were varied between (20 – 23) and (5.5 – 6.4) mgL-1 for Alum and aluminum chloride, respectively, at pre-chlorination dose 5 mgL-1, flash mixing 100 rpm for 1.0 min, slow mixing 40 rpm and sedimentation time for 20 min which is the most efficient at turbidity and algae removals with suitable residual chlorine.
