Coagulation-Flocculation plays a significant role in drinking water treatment. Laboratory\nexperiments were carried out in order to assess the effectiveness of using Conocarpus\nLeaves Solution (CLS) as a natural coagulant in conjunction with the synthetic\nchemical represented by Alum in the water purification. Biological test was\ncarried out to confirm that these leaves are not toxic, followed by optimizing the dosage\nof alum and then Alum and CLS were applied to the turbid water whose turbidity\nlevel has two ranges, (20 - 35) NTU and (90 - 120) NTU, using the JAR Test. The\nparameters determined before and after coagulation were turbidity, pH and temperature.\nThe experiments showed that the optimum dose of alum coagulant (individually)\nfor high turbid water is about 18 mg/l with PH = 7 and 24 mg/l f with PH = 5\nand 9. In addition, for the low turbidity water, the optimum dose of alum was lower\nthan in the high turbid water. In terms of using Alum in conjunction with CLS, at\nhigh range of turbidity, the results show that at 33% ratio of leaves solution to alum\ncoagulant, there are 50% and 75% turbidity reduction performed for the PH equal to\n5 and 9 respectively. Although about 62% and 65% turbidity reduction were achieved\nat PH = 7 and PH = 9 in the low range level. However, low reduction in turbidity has\noccurred when the water PH = 5. The amount of leaves solution added to the water\nin the water treatment plant is highly important, hence it decreases the amount of\nusing the synthetic chemicals by about 33% of the quantity that required for water\ntreatment and that will help both, the water industry and the human health. More\nstudies need to be achieved in particular different concentration of the Conocarpus\nleaves solution in order to improve the percentage of using the natural material as a\ncoagulant.
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