Effect of pH Change and water Temperature On Nickel Removal from Surface Water by Chemical Precipitation

Abstract

The research aims to find relationship between indications, change of raw surface water which are: pH, temperature, and optimum doses of alum [Al2(SO4)3.14H2O] to develop a suitable mathematical equation. A series of experiments were performed under different conditions and on different seasonal circumstances to determine the effect of the previous indications on the coagulation efficiency, where we treat  Qattinah lake water by Coagulation, Sedimentation then Filtration. We studied the impact of coagulant dose change with the change of pH water within the domain ( 6.5 to 8.5 ) and the percentage of nickel removal was 75 %  at pH = 8 , and we studied the effect of coagulant dose change with  raw water temperature change   ( from 5 to 25) °C on reducing the nickel concentration where the percentage of nickel removed when the temperature 20 °C was up to 85%, and all that when the coagulant dose was 30 mg/l.