This study aimed to treat the wastewater of several hospitals (Jamhory Hospital , Ibn-Sina Hospital , Batool Hospital , Hazem Al-Hafez Hospital) in Mosul city, by using the method of coagulation and flocculation and by using the Jar_Test as a laboratory scale. Alum and Lime were used as coagulants in wastewater treatment. The efficiency had been calculated by the following characteristics :- ( Chemical Oxygen Demand (COD), Total Solids Matter (T.S), Nitrate (NO3) , Phosphate (PO4) , (pH) , Electrical Conductivity (Ec) , Chloride , Turbidity ) . At the optimum dose of alum (80) mg/l removal efficiencies were (66%) for (COD), (73%) for (T.S) and (87%) for Turbidity . the Nitrate removal efficiency was (65%) at the optimum dose (60) mg/l .The optimum dose of Lime was (400) mg/l for removal (COD) , (T.S) and Nitrate , the removal efficiency of (COD) was ( 58%) , (67%) for (T.S) and (50%) for Nitrate . The Alum was better than Lime in removal efficiencies of pollutants from hospitals wastewater. The heavy metals removal efficiency at the optimum doses were ranged from ( 89.28-97.8)% .
Key words:- Physiochemical Treatment, Hospitals Wastewater , Heavy Metals , Alum, Lime, Coagulation