College of Natural and Applied Sciences

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Browsing College of Natural and Applied Sciences by Subject "Abbatoirs"

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    A study of environmental impacts of abattoirs on water bodies: a case of Nyabugogo abattoir facility in Kigali city, Rwanda
    (University of Dar es Salaam, 2008) Naila, Umubyeyi
    Abattoirs are known to pollute the environment from their processes. Nyabugogo Abattoir, the biggest in Kigali city, Rwanda, discharges its untreated effluent in Mpazi River. This research aimed at studying environmental impacts caused by the abattoir on its receiving water body and its users. It quantified the amount of water used and wastewater generated, identified and characterized the impacts, determined their significance and proposed mitigation measures. The overall water used and wastewater generated were estimated at SO m and 43m per day respectively. The qualities of the effluent and the river water were studied. The samples were collected weekly, preserved and analyzed in each case using Standard Methods. The parameters studied for river water upstream and downstream were as follows: pH 7.62, 7.83; COD 67.50, 971.33 mg/l; BOD 38.17, 325.50 mg/1; DO 0.237, 0.026 mg/1; TSS 67.5, 848 mg/1; nitrates 7.33, 21.35 mg/l and phosphates 18.62, 27.68 mg/l. Except for pH, the other parameters were not meeting the WHO and EHSG standards of effluent. This resulted into anoxic conditions of the river. Also, data was collected for impacts of the abattoir on the people living in its vicinity using questionnaires; 80% complained about bad odors from the plant and 40% about skin diseases caused by using River water. Nyabugogo Abattoir generates large quantities of highly concentrated effluent which adversely impacts the environment. Blood collection and dry cleaning should be adopted in order to reduce the effluent concentration and volume. A subsurface flow constructed wetland was proposed for Nyabugogo Abattoir effluent treatment.