Abstract:The use of synthetic coagulants is not regarded as suitable due to health and economicconsiderations. Studies were carried out in laboratory scale on deionised water containing synthetic turbidityof kaolinite. Experiments were carried out in four turbidity ranges: 10, 50, 500, 1000 (NTU) and the pH range 5-8.The efficiency of moringa oleifera seed extract and polyaluminum chloride was examined with jar test. Extractof moringa oleifera seed could respectively remove turbidities of 98, 97, 89 and 55 percent in optimumconcentration 10-30 (mg/l) and the optimum pH of 6-8. Poly aluminum chloride could remove 99, 98, 95 and89 percent of the above mentioned turbidity ranges in optimum concentration of 20-30 (mg/l) with the optimumpH of 8. The aim of this study was to compare the efficiency of two coagulants polyaluminum chloride and“moringa oleifera”, which is a natural coagulant. The results of this study showed that the extract of moringaoleifera seed had a minimal effect on pH and a higher efficiency in removing high turbidities in comparison withlow turbidities. Reduction of pH decreased the efficiency of polyaluminum chloride in turbidity removal. Studiesshowed that the dominant mechanism turbidity removal by moringa oleifera seed extract was adsorption andcharge neutralization and intera particular bridging.
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