Browsing by Author "Ndayikeza, Belyse"

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    Préparation du charbon actif à base des produits locaux en vue d‟un traitement des eaux usées urbaines : Cas des rafles de maïs
    (UB, EANSI, 2025-04) Ndayikeza, Belyse; Sous la direction de : Dr Pierre Ntakiyiruta
    Solid agricultural waste management requires special attention. Solid agricultural waste can be recovered through methods that contribute to sustainable management and waste reduction, such as composting, biodigestion, biomass energy, organic fertilizers, and activated carbon. However, the lack of adequate infrastructure and awareness of sustainable management practices limits its effective treatment. The objective of this study is to contribute to the valorization of vegetable waste, specifically corn cobs, into activated carbon through carbonization at 450°C, preceded by chemical impregnation using 40% phosphoric acid. The prepared activated carbon was used to treat wastewater from the R3 collector in the city of Bujumbura, located in the Asian district. The corn cobs, the prepared activated carbon, and the wastewater to be treated were characterized using standard methods. The influence of the adsorbent dose and agitation time on the effectiveness of the activated carbon in treating wastewater from the R3 collector was also monitored. The results obtained from the physico-chemical characterization of the corn cobs used to prepare the activated carbon are as follows: moisture content = 13.57%, dry matter = 86.3%, ash content = 6.505%, volatile organic matter = 79.63%, fixed carbon = 13.865%. The physico-chemical characteristics of the prepared activated carbon are: ash content = 3%, moisture content = 7.94%, pH = 6, iodine number = 1070.58 mg/g. The overall results obtained from the treatment of wastewater from the R3 collector show improved pollutant removal rates, notably for NO₃⁻ at 96.6%, NH₄⁺ at 75.75%, phosphates at 70.49%, and turbidity at 94.4%. These results were achieved under the following conditions: a mass of 1g of adsorbent for 100 ml of water and an agitation time of 3 hours.