Performance evaluation of a natural coagulant for removal of turbidity and optimisation of the coagulation process

摘要

The experiments were performed using batch coagulation-flocculation tests in order to determine the effect of varying pH, settling time and coagulant dose of Eugenia jambolana ( jambhul ) seed powder on initial turbidity of 30 NTU and 95 NTU respectively. In the batch test, the optimum turbidity removal was observed at a dose of 8 mg/L and 20 mg/L for 30 NTU and 95 NTU turbidity respectively. In the case of varying pH, optimum turbidity removal was observed at pH 8.5 for both turbidity ranges. It is also observed that, as the settling time increases, the residual turbidity decreases for both the turbidity ranges for Eugenia jambolana ( jambhul ) seed powder. The optimisation study was significant. The ANOVA analysis performed assures the reliability of models indicating the significance of results and actual turbidity removal was nearly the same as predicted turbidity removal.