Browsing by Author "Bainomugisha, Jonan"

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    Analyses of Bioretention Systems for Removal of Stormwater Pollutants
    (Journal of Ecological Engineering, 2024) Sholagberu, Abdulkadir T.; Nuwagaba, Emmanuel; Tibenderana, Philip; Terseer, Ako; Bainomugisha, Jonan; Twesigye-omwe, Moses N.; Agwe, M. Tobby; Oluwatosin, Olofintoye O.
    Stormwater transports directly into rivers eroded soil, animal wastes, pesticides, fertilizers and other potential pollutants. Bioretention is often designed to capture and treat it using the natural properties of soil and plants. However, selection of appropriate media structure and plants need to be adequately studied. This study investigated the performance of bioretention system in removing stormwater pollutants using Dracaena, a local plant, also called Song of India Plants. Physical model of three Columns A, B and C were developed having five layered filter media of different configurations whose materials were analyzed to meet the design standards. The plants were introduced into Columns A and C leaving out B as control experiment. The quality parameters were determined before and after treatments at ages 10, 20, 30and 40 days when Dracaena plants were introduced into bioretention models. The results showed that the bioretention model drastically improved stormwater quality by reducing values of electrical conductivity, total coliforms (TC), fecal coliforms (FC), total suspended solids (TSS) and biochemical oxygen demand (BOD) as compared to the tested raw stormwater samples. The filter media in both Columns A and C substantially reduced the pollutant levels to standard discharge limits for all parameters tested such as TSS, TC, FC, BOD and nitrates. BOD fell within the recommended standard after 20 days of treatment in Column C with considerable reduction in TC and FC by 68.9% and 75.4% respectively when compared to raw stormwater sample. However, Column C completely removed TC and FC at 40 days which are pathogen indicators in wastewater. This study would be useful to the stakeholders for sustainable stormwater treatment and management.
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    Investigating the Use of Open Air Burnt Sorghum and Wheat Straw Ashes to Soften Hard Water.
    (Kabale University, 2022) Bainomugisha, Jonan
    This study investigated the use of open air burnt sorghum and wheat straw ashes to soften hard water, three water samples that is sample A which was collected from a borehole at the camp of CICO-UNRA on Hoima Butiaba Wanseko road project located in Hoima District, B from a borehole in wanseko village - kigwera parish Bulisa District, and sample C from Koranorya borehole Ruk:ungiri District. These samples were tested to ascertain their initial properties, sample C was found to be with the highest hardness which was 740 mg/1 and was adopted to be used in the entire hardness removal experiment. It was then treated with different dosages of both SSA (sorghum straw ash) and WSA (wheat straw ash) starting from 2.5g and went on increasing uniformly by 2.5g until the maximum hardness removal efficiency of both ashes was reached i.e. where the further addition of ash did not change the hardness of water. It was observed that at a dosage of 20g/l, the hardness had been reduced to 348mg/l for WSA and at 22.5g, it had been reduced to 430mg/l for SSA. Further analysis on the treated water showed that the Color, TDS, Turbidity, PH and Alkalinity increased by 75%, 297%, 55%, 27.5% and 12% respectively for WSA at 20 grams of ash per liter of water and 75%, 306%, 90%, 29.5% and 17% respectively for sorghum straw ash at 22.5g/l. All these parameters were increased but remained within the acceptable Ugandan standard limits for portable water except for the alkalinity which still increased beyond the standard maximum of 500mg/l much as the initial results on the sample before addition of the ashes was at 576 which was still beyond the standard. Finally, WSA demonstrated the highest hardness removal efficiency of 53% at a dosage of 20g/l than SSA that reduced it by 42% at a dosage of 22.5 g/1.