Abstract
The study aimed to apply the concept of Ballasted Flocculation (BF) at modified jar test for different turbidities for Tigris rivers raw water in order to find out the optimum values for each of :the additives chemicals, the ballasted agent doses and the operating conditions which are each of the detention time and velocity gradient
A study of366 samples for six levels of initial synthetic turbidity of the Tigris River showed that it is possible to ad optBF technique successfully, and it reduces the time of the treatment phase and increase the stability of the quality of water treatment, but doesnotreducetheconcentrationsofthe chemicals which are used. The study showsthattheuseofalumconcentrationof30-40mg/Lwithpolymerconcentrationof0.2-0.4mg/L and BAconcentrationof0.5-2.5g/L forthe range of diametersbetween75-212 μmachievea residualturbidity ~1 NTU for supernatant water
