Browsing by Author "Karungamye, Petro Novert"

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    Potential of Canna indica in constructed wetlands for wastewater treatment: A review
    (MDPI, 2022) Karungamye, Petro Novert
    This article reviews investigations in which Canna indica was utilized in constructed wetlands (CW) for wastewater treatment of a variety types. It is strongly urged that ornamental flowering plants be used in CWs as monoculture or mixed species to improve the appearance of CWs whilst still treating wastewater. Plants play important roles in CWs by giving the conditions for physical filtration of wastewater, a large specific surface area for microbial growth, and a source of carbohydrates for bacteria. They absorb nutrients and integrate them into plant tissues. They release oxygen into the substrate, establishing a zone in which aerobic microorganisms can thrive and chemical oxidation can occur. They also provide wildlife habitat and make wastewater treatment system more visually attractive. The selection of plant species for CW is an important aspect during the CW design process. Canna indica’s effectiveness in CWs has shown encouraging results for eliminating contaminants from wastewater. There is still a scarcity of information on the mechanisms involved in removal of specific contaminants such as pharmaceuticals, personal care products, hormones, pesticides and steroids and their potential toxicity to the plants. Therefore, this paper reviews some published information about the performance of Canna indica in wastewater treatment, as well as potential areas for future research
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    A study on adansonia digitata pulp and seeds methanolic extracts as corrosion inhibitors of mild steel in acidic media
    (The University of Dodoma, 2017) Karungamye, Petro Novert
    The corrosion inhibition efficiency of Adansonia digitata (baobab) pulp and seeds methanolic extracts on mild steel in acidic media is investigated using different standard corrosion methods at room temperature. Weight loss measurement, Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) were applied to evaluate inhibition efficiency in the presence of Adansonia digitata Pulp Extract (AdPE) and Adansonia digitata Seed Extract (AdSE) as corrosion inhibitors. The surface morphological changes were analysed using the Scanning Electron Microscope images. The results revealed that AdPE and ADSE are efficient inhibitors of corrosion of mild steel in different acidic media. The corrosion rates were observed to decrease with increase in concentration of the extracts. Inhibition efficiency (% IE) is comparatively high in HCl compared to H2SO4 and decrease with concentration of acid. The values of % IE were 77.61 and 91.12 in 0.5 M HCl, 76.25 and 85.63 in 1.0 M HCl, 71.83 and 79.22 in 0.5 M H2SO4 and 59.63 and 74.35 in 1.0 M H2SO4 for AdPE and AdSE, respectively. The electrochemical analysis also confirmed that the corrosion current density decreases as the concentration of the extract increases, causing a reduction in the corrosion rate of the mild steel sample. Moreover, Nyquist plots from EIS also proved that as the concentration of plant extracts increases, the charge transfer resistance increases and the double layer capacitance decreases. The inhibitive action of the plant extracts demonstrates that the adsorption of plant extracts is spontaneous, and the physical adsorption follows Langmuir adsorption isotherm. All experiments reveal that AdSE works better as corrosion inhibitor of mild steel in acidic media than AdPE.