Abstract

• In the present work, the Ngamoeyeik creek water sample was collected from North Dagon Township, Yangon Region. Some physicochemical properties (pH, turbidity, conductivity, chemical oxygen demand, biochemical oxygen demand, total alkalinity, total hardness, total suspended solids and total dissolved solids) of the creek water sample were determined by standard method. Elemental analysis of some trace elements (Cr, Mn, Fe, Cu, Zn, Pb, Cd, Mg, Ca, K, Na and As) of the creek water sample were measured by atomic absorption spectrophotometer (AAS). Bacteriological properties of creek water sample were investigated by AOAC method. The conventional treatment design for creek water was modified by coagulation and flocculation approach. In the lab study, the experiments with two parameters such as doses of M. oleifera seeds powder (1, 2, 3, and 4 g/L) and contact times (1, 2, 3 and 4 h) were conducted to study their effects on the flocculation process. This process showed in significant reducing of turbidity. The optimum conditions for water treatment by using M. oleifera (Dant-da-lun) seeds powder are 2 g/L dose and 1 h of contact time. After treatment the observed values of (pH, total suspended solids, total dissolved solids, Mn, K, Cd, Mg, total coliform and E.coli) are significantly reduced.