Optimization of Coagulation-floculation of Water from the Djoué River at the Drinking Water Treatment Station in Brazzaville
Keywords:
Turbidity, coagulation-flocculation, aluminum sulfate, jar-test, abatementAbstract
The present work proposes to study the clarification of raw water by the elimination of organic (OM), mineral and colored matter thanks to the process of coagulation-flocculation by aluminum sulfate. We were first interested in a first part in the study of the process applied to the drinking water treatment plant. In a second part, we carried out this same process at the laboratory level by jar-test. A comparison of turbidity reduction by aluminum sulfate coagulation was estimated. For all samples, a sharp drop in turbidity was observed in the first three beakers for doses ranging from 0.06 to 0.08 g/L of aluminum sulfate. These doses were adopted in the study of the effect of pH set at 7. The resulting turbidity after 30 minutes of settling varies between (reduction of 25 to 81 %) depending on the dose and the sample. Very good elimination is observed with a dose of aluminum sulfate equal to 0.08 g/L (reduction in the order of 67.31 to 81.06 %). At this optimum dose, it can be considered that all the surface charges have been neutralized.
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