The study was conducted on the status of the\nquality of water from the Owabi water treatment plant that\nsupplies drinking water to Kumasi, a major city in Ghana,\nto ascertain the change in quality of water from source to\npoint-of-use. Physico-chemical, bacteriological water\nquality parameters and trace metal concentration of water\nsamples from five different treatment points from the\nOwabi water treatment plant were investigated. The raw\nwater was moderately hard with high turbidity and colour\nthat exceeds the WHO guideline limits. Nutrient concentrations\nwere of the following order: NH3\\NO2\n-\\-\nNO3\n-\\PO4\n3-\\SO4\n2- and were all below WHO\npermissible level for drinking water in all the samples at\ndifferent stages of treatment. Trace metal concentrations of\nthe reservoir were all below WHO limit except chromium\n(0.06 mg/L) and copper (0.24 mg/L). The bacteriological\nstudy showed that the raw water had total coliform\n(1,766 cfu/100 mL) and faecal coliform (257 cfu/100 mL)\nthat exceeded the WHO standard limits, rendering it unsafe\nfor domestic purposes without treatment. Colour showed\nstrong positive correlation with turbidity (r = 0.730), TSS\n(r C 0.922) and alkalinity (0.564) significant at p\\0.01.\nThe quality of the treated water indicates that colour, turbidity,\nCr and Cu levels reduced and fall within the WHO\npermissible limit for drinking water. Treatment process at\nthe water treatment plant is adjudged to be good.
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