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Abstract:
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The Matero Ponds, Chelston Ponds, Ndeke Ponds and Mindolo Ponds, were the four waste stabilization ponds studied in order to evaluate their performance on sewage treatment. The studies on these ponds included colletion and analysis of the design details. Construction, operation and maintenance of the ponds were also studied. Influent and effluent samples from the ponds were tested in the laboratory for pH, permanganate values, suspended solids, bacteria and biochemical oxygen demand. The results obtained were compiled together with the testresults recorded by the authorities of the ponds. The results were analysed and the performance of the ponds for sewage treatment were evaluated. It was found out that bacteria reduction for all the ponds was not satisfactory. Besides, the removal of suspended solids in the Matero and Chelston Ponds was also poor. The deficiencies of pond performance were attributed to the designs, overloading and operation of the ponds. The pH, permanganate values and biochemical oxygen demand results from the ponds were satisfactory. To improve the performance of the ponds it was suggested that the ponds should be extended and rearranged. The construction, operation and maintenance of the ponds should also be improved. /Kir09 |