Browsing by Author "Mustapha, S.I."
Now showing 1 - 4 of 4
Results Per Page
Sort Options
Item Evaluation of Predictive Capability of Artificial Neural Network and Multiple Linear Regression: A Case Study of Lipid Extraction from Microalgae using Quaternary Solvents(Published by Department of Civil Engineering University of Ilorin, Ilorin, 2019) Mustapha, S.I.; Aderibigbe, F.A.; Mohammed, I.A.Abstract: Thiresent study was carried out to evaluate the performance of artificial neural network (ANN) and multiple linear regression (MLR) as modelling tools for predicting the lipid yield obtained from microalgae using quaternary solvent mixtures. The MLR models were developed using two different mathematical softwares viz. Microsoft excel (model 1) and Polymath (model 2). The augmented simplex lattice design under the mixture methodology of the Design Expert software was used to generate the design of experiments used in this study. A comparison of the models developed using ANN and MLR for the extraction process was carried out based on pertinent statistical parameters. Although the results from both MLR models were very close, the calculated values of coefficient of determination (R2) of 0.9934 and the average absolute deviation (AAD) of 2.4789 for the ANN model when compared with values obtained from the MLR (R2 = 0.9898 and AAD = 2.9821 for model 1) and (R2 = 0.9898 and AAD = 2.9825 for model 2) showed that the ANN model was more accurate and precise than the MLR models. The actual maximum lipid yield of 19.4 wt% lipid g-1 DCW was obtained at solvent mixture in the volume ratio of 1:5:1:1 for chloroform, methanol, ethanol, and dichloromethane respectively.Item Exposure to total volatile organic compounds from household spray products(Kaunas University of Technology, 2017) Adeniran, J.A.; Yusuf, R.O.; Mustapha, S.I.; Sonibare, J.A.Emission of volatile organic compounds from the use of household spray products has a negative impact on health and environment. Total volatile organic compound (TVOC) concentration levels emitted from 45 registered consumer spray products in Nigeria were measured using the MultiRAE TVOCs gas monitor. Human exposure to emitted TVOCs through inhalation, ingestion or through the dermal route was evaluated using the ConsExpo spray model. The average TVOCs emission from all the investigated samples was in the range of 1,664 and 560,994.7 μg m-3 with an average of 63,632.2 μg m-3. Generally for all the samples considered, the average released concentrations, the inhaled doses, the dermal doses, and the average deposition rates values obtained were in the ranges of 1.83E+04 – 1.00E+06 μg m-3; 1.47E+03 – 8.01E+04 μg; 3.41E+04 – 4.84E+05 μg; and 1.79E+01 – 1.01E+03 μg s-1, respectively. The results provide information that could be used to significantly improve human exposure and risk assessment to emitted aerosols from spray products.Item Removal of Lead and Chromium from Aqueous Solution onto Flamboyant (Delonix regia) Pod Activated Carbon.(Published by Faculty of Engineering and Technology, University of Ilorin, Ilorin., 2017) Mustapha, S.I.; Adewoye, L.T.; Aderibigbe, F.A.; Alhaji, M.H.; Adekola, M.I.; Tijani, I.A.BSTRACT: The contamination of water by potentially toxic elements is considered a global problem. It calls for a safe, economic and technological approach in order to curb and prevent the devastating effect of the menace on both human and the aquatic life. In the light of this background, the adsorption potential of flamboyant pod activated carbon (FPAC) for the removal of chromium and lead from aqueous solution was studied. The effect of contact time, pH, initial concentration as well as adsorbent dosage on the removal efficiency of both metal ions was investigated via batch adsorption. Characterization of the FPAC adsorbent was done using Brunaur Emmett Teller and Fourier transform infrared spectroscopy. The maximum adsorption capacity Qe was found to be 34.48 and 16.13 mg/g for Pb (II) and Cr (VI), respectively. The Langmuir isotherm model showed a better fit to the equilibrium data than the Freundlich isotherm model. The mechanism of adsorption for both metal ions onto the FPAC agrees well with pseudo second order kinetic model. The results showed that FPAC has excellent adsorption properties and thus can be used as an effective low-cost adsorbent for the removal of lead and chromium ions from aqueous solution.Item Valorization of Sugarcane Bagasse for Hydrogen-Rich Gas Production using Thermodynamic Modeling Approach(Faculty of Engineering and Technology, University of Ilorin, Ilorin, 2022) Mustapha, S.I.; Mohammed, I.A.; Aderibigbe, F.A.; Adewoye, L.T.; Omoarukhe, F.O.; Sowole, A.O.Hydrothermal gasification also known as supercritical water gasification (SWG) has been considered a promising approach for converting wet biomass such as sugarcane bagasse into high-quality syngas. This study presents the thermodynamic modeling of the hydrothermal gasification of sugarcane bagasse using Aspen Plus. The effects of process parameters on the composition and yield of product gases were also investigated. It was found that the effect of temperature and biomass concentration were significant in the production of hydrogen-rich gas, while less impact was observed with pressure. The hydrogen gas (H2) produced with the highest mole fraction (56.70 mol%) and yield (103.26 kmol/kg) was obtained at 750°C and low biomass concentration of 10 wt%, while the lowest yield (1.52 kmol/kg) and mole fraction (2.45 mol%) of H2 were obtained at 450°C and high biomass concentration of 50 wt%. Findings from this study also showed that the highest net calorific value (17.55MJ/kg) was reached at 450˚C and 50 wt% of biomass concentration. This study would help to consolidate research on hydrothermal gasification of sugarcane bagasse and optimization of experimental processes and also serve as an important benchmark in the utilization of biomass as a clean energy source for future projects.