Browsing by Author "Ajayi-Banji, A. A."
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Item Biosorbability of coconut husk char in polyatomic ion sequestration(International Journal of Technology, 2016) Ajayi-Banji, A. A.; Ajimo, A. O.; Igbode, I.Agricultural waste has increased colossally with development in agricultural production causing environmental nuisance and degradation. Utilization of coconut husks, one of such type of waste, as a biosorbent for polluted surface water treatment, was considered in this study. Polluted surface water was gently passed through two similar columns loaded with 100 and 200 g of coconut husk char respectively. The treated water samples collected after 30, 60, 90, 120 and 150 mins were examined for SO42-, NO3- and PO43- ions concentration. Removal efficiency for SO42-, NO3- and PO43- ions on 100 g coconut husk char after 150 mins detention time were 70, 78 and 91% respectively. Freundlich isotherm model gave a better description of the data (R2 > 0.96). Sorption data was well described by second order pseudo kinetics (R2 > 0.85). An amount of 100 g of the biosorbent has a strong affinity for these types of ion removal in contaminated water. Coconut husk char as a biosorbent is a panacea to significant concentrations of polyatomic ions in polluted surface water.Item Deleterious emission abatement through structured energy use pattern: A north central Nigeria perspective(Environmental and Climate Technologies Journal,, 2016) Ajayi-Banji, A. A.; Omotosho, Y; Amori, A; Omoyeni, D; Igbode, I; Abimbola, OHolistic view of household energy consumption based on greenhouse gas emissions in the North Central cities of Nigeria was examined in this study. Scenarios considered were based on income level of energy users (low and high) and energy metering system (i.e. pre-paid and post-paid energy billing systems). Strong direct nexus was observed between energy use and emissions pattern. Energy utilization by post-paid category had higher weekly average value of 35.09 and 41.70 kWh as against 23.18 and 33.38 kWh for low and high income pre-paid consumers respectively. Energy use and greenhouse gas emissions from both classification followed similar trend. Data obtained and analysed in the study show that global warming and acidification potentials could be reduced by 33.94 and 19.95 % for low and high income category consumers when pre-paid meters are in place. Conclusively, energy system users with pre-paid metering system displayed reasonable level of management decisions that reduce energy wastage and consequently environmental negative impacts.Item Investigation of locust beans husk char adsorbability in heavy metal removal(Research in Agricultural Engineering, 2017) Ajayi-Banji, A. A.; Ogunlela, A. O.; Ogunwande, G. A.The column adsorption study examines irrigation water treatment prior to its application in order to ensure water-crop-consumer heavy metal transfer reduction to the safe level using locust bean husk char (LBHC) as biosorbent. Char structural pattern was investigated with SEM-EDX machine. Contaminated surface water was introduced simultaneously into the bioreactors containing 100 and 200 g of LBHC and collected after 30, 60, 90 120 and 150 min of detention time. Removal efficiency, isotherm and kinetic sorption model were the evaluation tools for the study. Percent of Cr, Cd and As removal at 150 min retention time were 83.33, 100 and 100%, respectively for 100 g biosorbents. A similar trend was observed for Cr and As removal at the same retention time for 200 g of LBHC. Metals sorption conforms to the Freundlich isotherm with correlation coefficient values greater than 0.92. Experimental kinetics had a good fit for pseudo second order (R2 > 0.94 for most cases). Removal efficiency is a function of contact time, biosorbent dosage and metal concerned. Locust bean husk char has good and effective treatability for some heavy metals in mildly polluted water.Item On the use of non-activated carbon derived from abattoir solid waste to adsorb heavy metals in contaminated surface water.(Research and Development Institute of Silpakorn University, Thailand., 2017) Sangodoyin, A. Y.; Ajayi-Banji, A. A.Heavy metal is a major environmental pollutant with deleterious health effect on man, flora and fauna especially in accumulated form. Possible solution for the attenuation of the contaminant has been examined using various treatment methods. Column biosorption study was carried out to examine the potential of non–activated carbons from abattoir solid wastes in some heavy metals removal. Removal efficiency and isotherm models were tools used to evaluate bone and horn chars potential in metals removal from industrially contaminated surface water. Biosorbents structural pattern was investigated using SEM-EDX machine. Results indicate 100, 67 and 50 % removal of cadmium, lead and chromium respectively after 4 h detention time for both chars, though bone char has higher treatability for iron removal from polluted surface water than horn char. Freundlich isotherm model had a better fit in lead, manganese and chromium removal description with high R2 value for both chars. Calcium ion exchange occurred during the sorption process without secondary contamination of the treated effluent. The results suggest that abattoir solid wastes are effective biosorbents for iron removal in mildly polluted surface waterItem Potential environmental impact of household solid waste management in Nigeria: A case study of Ilorin Metropolis(University of Ilorin, Kwara State, Nigeria, 2015) Ajayi-Banji, A. A.; Ojeanelo, G; Adeniran, K. AAnthropogenic activity induced emissions have led to significantly increased environmental degradation. The greenhouse gas emissions generation rates are stimulated by technological innovations including solid waste management technologies. In this study, categorized household solid wastes from Ilorin metropolis were collected, sorted and weighed vis-a-vis population densities and income groups. The classifications are high income low density area (HILDA), High Income High Density Area (HIHDA), Low Income Low Density Area (LILDA) and Low Income High Density Area (LIHDA). Data were processed for potential emission generation from solid waste management technologies. Result shows that householders generate high food composition (25%) in comparison with other household refuse categories. Occupants’ lifestyle with respect to domestic waste composition is influenced by income level, as high income earners generated more disposables. Strong nexus exist between household income-population and all the technologies considered except composting. Order of emission generation rate per week from the waste management technologies is landfilling> anaerobic digestion> incineration> composting. Landfill technology produces the highest CO2 emission (0.0015- 0.65 KgCO2e/week) for all waste categories and HIHDA householders have the highest values while anaerobic digestion has the least emission equivalent (0.0 – 0.01 KgCO2e/week). High contributive waste management method to global warming should be replaced with environment-friendly techniques