Papers by Abdullahi Mohammed Evuti
Nigerian Journal of Technological Development, 2014
High cost of pilot scale studies has led engineers to use simulation to study the factors that af... more High cost of pilot scale studies has led engineers to use simulation to study the factors that affect process performance. This study focuses on the interactive effect of air-water ratio and temperature on the removal of volatile organic compounds from polluted water using packed column air stripper taking benzene as a case study. The process governing equations developed based on two-film model of mass transfer were solved using MATLAB and a surface response plot was done. The mass transfer coefficient increased from 0.1237x10 -5 to 0.1932x10 -5 s -1 as the temperature was raised from 293 to 323 K. Also, the Henry’s constant increased from 228.59 to 883.36 K as the temperature was raised from 293 to 323 K. Benzene removal efficiencies of over 99% were obtained for all combinations of temperature and air-water ratio. The result also indicated that air stripping of benzene from wastewater is most dependent on temperature and moderately on air-water ratio.
Environmental Engineering and Management Journal, 2016
One way to improve the performance of non-thermal plasma (NTP) reactor for volatile organic compo... more One way to improve the performance of non-thermal plasma (NTP) reactor for volatile organic compound decomposition is by the introduction of ferroelectric materials into the discharge zone of NTP. This paper is a review of the breakthroughs and the current status of the applications of this technology for the abatement of volatile organic compounds (VOCs). It covers the process of energy generation in NTP, VOCs decomposition processes and the effects of critical factors such as type of packed bed materials, dielectric constant, pellet size and shape on the VOCs removal efficiency. Finally the mechanism of VOCs decomposition process was also presented.
Desalination and Water Treatment, 2015
This study examined the treatment of toluene and m-xylene from wastewater using integrated air st... more This study examined the treatment of toluene and m-xylene from wastewater using integrated air stripping and non-thermal plasma (NTP) reactor system. Toluene and m-xylene concentrations, before and after plasma treatment, were determined using Fourier transform infrared spectroscopy. The performance of the NTP reactor was optimized using the central composite design of the response surface methodology. The optimum discharge gap, applied voltage, and flow rate for the decomposition were found to be 22.34 mm, 15 kV, 3.56 L/min and 20.10 mm, 15 kV, 3.34 L/min for toluene and m-xylene, respectively. Experimental removal efficiencies and model predictions were in close agreement with 1.25 and 2.16% errors for toluene and m-xylene, respectively. The developed model could fit the experimental data with acceptable values of percentage errors.
Air samples from densely and less densely populated areas of Abuja Municipal Area Council, Kuje a... more Air samples from densely and less densely populated areas of Abuja Municipal Area Council, Kuje and Dobi Village in Gwagwalada Area council were analyzed using BW Technology GasAlaert® Microclip (gas detection instrument). The results showed varying concentrations of hydrogen sulphide, carbon monoxide and low explosive limit gases. The high concentrations of pollutants detected in Abuja municipal area council can be attributed to increased population growth, increased production of gaseous wastes and increased number of industries. However, no low explosive limit gas was detected in Kuje area council and with only emission of low explosive limit gases in Dobi, Gwagwalada area council which was due to decomposed refuse around the market and rice milling waste within settlements, in Dobi village.
World Applied Sciences Journal, 2013
Optimum pH and coagulant dosage for chemical precipitation by coagulation-flocculation process in... more Optimum pH and coagulant dosage for chemical precipitation by coagulation-flocculation process in wastewater treatment plants is conventionally obtained through repeated jar test. In this research, optimization of the performance of chitosan for the removal of nickel from industrial wastewater was carried out using design of experiment and response surface methodology (RSM). The individual linear and quadratic effects of coagulant dosage and pH on the degree of removal of nickel were investigated. The optimum nickel removal from wastewater using Chitosan was 82.31% at optimum variables of pH 10.35 and coagulant dosage of 677 mg/L. The model used in predicting the precipitation process gave a good fit with the experimental variables and hence the suitability of RSM method for the optimization of chitosan performance.
Reviews in Chemical Engineering, 2014
Addressing environmental degradation and ensuring environmental sustainability are inextricably l... more Addressing environmental degradation and ensuring environmental sustainability are inextricably linked to all methods of reducing volatile organic compounds (VOCs) from the environment. A packed column air stripper is a typical example of such technologies for the removal of VOCs from polluted water. The present review is devoted to the applications of a packed column air stripper and, in comparison with previous reviews, presents further elaborations and new information on topics such as modeling and simulation of the dynamic behavior of the air stripping process in a packed column air stripper. The paper observed that a knowledge gap still exists in the synthesis of this knowledge to formulate practically applicable mathematical relationships to describe the process generally. Therefore, further researches are still required in the area of air stripper performance optimization, particularly in the development of a mathematical model and the optimization of an air stripper using a statistical experimental design method. Such a determination is critical to the understanding of the interactive effect of process variables such as temperature, air-to-water (A/W) ratio, and height of packing on air stripper performance.
Jurnal Teknologi, 2014
In this research, the effects of temperature and air flow rate on the removal efficiency of xylen... more In this research, the effects of temperature and air flow rate on the removal efficiency of xylene from wastewater using packed column air stripper were investigated at a temperature range of 30 to 500C and air-water ratios of 20 to 100. The quantities of xylene in effluent from the air stripper were determined using UV-visible spectrophotometer. The effects of increase in temperature on the percentage removal of xylene were found to be more significant at low temperatures (30-400C) than at higher temperatures (45-500C). Also, the effects of increase in water-air ratio on percentage removal of xylene were less significant at higher G/L ratio (80-100) and more significant at low G/L ratios (20-60), thus revealing a non-linear trend in the effect of temperature and air-water ratio on xylene removal.The result also indicates that xylene removal efficiency is greatly affected by column temperature and G/L ratio with the highest removal efficiency of 99.93 at temperature of 500C and at G...
University of Abuja, Nigeria. Abstract-Physico-chemical characteristics of water from five differ... more University of Abuja, Nigeria. Abstract-Physico-chemical characteristics of water from five different hand dug wells in Tudun wada, Kaduna-Nigeria (Mando road, Rigasa road, Jada road, ungwan sanusi and Faskari road) in Tudun wada, Kaduna were investigated. The ...
Desalination and Water Treatment, 2014
Volatile organic compounds in water and wastewater can be removed using air stripping. The effect... more Volatile organic compounds in water and wastewater can be removed using air stripping. The effects of temperature and air-water ratios on the air stripping of benzene, toluene and xylene (BTX) from wastewater have been examined at a temperature range of 30-50˚C and air-water ratios of 20-100. Removal efficiencies of >99%, >93% and 93% for BTX, respectively, were obtained at 50˚C and air-water ratios of 100. The removal efficiencies increase non-linearly with temperature and air-water flow ratio. The effects of increasing temperature on the removal efficiency were found to be more significant at temperatures between 30 and 35˚C than at 45 and 50˚C. The effects of increasing water-air ratios on the removal efficiency were more significant at air-water ratios of 20-60 than at 80-100. The results indicate that a high removal of BTX can be achieved by operating the air stripper at high temperature conditions even at relatively low air-water ratios and vice versa.
Journal of Applied Sciences …, 2010
In this paper, mathematical model for determining the quantities of chlorine required for water t... more In this paper, mathematical model for determining the quantities of chlorine required for water treatment was developed by considering the interrelationship between water quality parameter such as temperature (T), pH and coliform counts (B) and the quantities of chlorine (Q 2) required for treatment. The developed model equations were found to be. Q 2 =
World Applied Sciences Journal, 2013
Mass transfer operation such as air stripping is used in the removal of volatile organic compound... more Mass transfer operation such as air stripping is used in the removal of volatile organic compounds from wastewater and to improve its performance requires a critical study of many factors that affect the process performance.Using a MATLAB simulation of the process governing equations of the air stripper, the effect of process variables such as temperature, air to water flow rate, stripping factor, Henry's constant of the VOC and the overall mass transfer coefficienton the performance of air stripper in the removal of volatile organic compounds from wastewater (benzene) was carried.The result shows that removal efficiency increases with temperature, air to water flow and the overall mass transfer coefficient.A temperature of 303K is therefore considered as the optimum operating point, since further heating will not give any commensurate change in the removal efficiency and hence uneconomical.
Applied Surface Science, 2013
ABSTRACT Novel chitosan-modified magnetic graphitized multi-walled carbon nanotubes (CS-m-GMCNTs)... more ABSTRACT Novel chitosan-modified magnetic graphitized multi-walled carbon nanotubes (CS-m-GMCNTs) were synthesized via a suspension cross-linking method. Composition, morphology and magnetic properties of as-prepared CS-m-GMCNTs were characterized by XRD, SEM-EDS, BET and VSM. The large saturation magnetization (12.27 emu g-1) allows fast separation of CS-m-GMCNTs from treated aqueous solution. The adsorption of congo red (CR) on CS-m-GMCNTs was strongly dependent on pH, temperature of the aqueous phase and adsorbent dosage. Up to 100 and 94.58% color removal could be achieved in 100 min contact time with 10 and 50 mg L-1 of initial concentrations, respectively. The adsorption capacity of CR onto CS-m-GMCNTs could reach 262.9 mg g-1. The pseudo-second-order kinetic model with high correlation coefficients (R2 > 0.999) was suitable to describe the process of CR adsorption onto CS-m-GMCNTs. The Langmuir model fitted the adsorption isotherm data better than the Freundlich model. Values of thermodynamic parameters (ΔG°, ΔH° and ΔS°) indicated that the adsorption process was strongly dependent on temperature of the aqueous phase, and spontaneous and endothermic process in nature. Therefore, CS-m-GMCNTs adsorbent displays main advantages of excellent dispersion, convenience separation and high adsorption capacity, which implies their potential application in the environmental cleanup.
Jurnal Teknologi, 2013
In this study, series of batch adsorption experiment were conducted to examine the color removal ... more In this study, series of batch adsorption experiment were conducted to examine the color removal efficiency of CSAC and CACs from waste water. The CAC is coal base activated carbon while the CSAC was manufactured in the laboratory. Yellow dye colour (Tartrazine E102) was utilized as the colourant. The adsorption efficiencies of the adsorbents were evaluated and compared by measuring the percentage of color removed. The effects of solution pH, adsorbent concentration, contact time as well as initial color concentration on the colour removal efficiency were also investigated. The optimum adsorption of color was achieved at low pH (pH 1.68), low initial color concentration (50mg/L) and 12g/l carbon dosage with removal efficiency of 75% for CAC and 45% for CSAC, with one hour agitation. Lower colour removal efficiency of 25% for CAC and 17% for CSAC were obtained at higher pH (pH 9-12), higher initial color concentration (100mg/L) and low carbon dosage, under the same retention time. A comparison of the Langmuir and Freundlich isotherm models of the adsorption data shows that Langmuir isotherm shows higher correlation coefficient, R2. The results indicate that CSAC has the potential as a low cost alternative for colour removal but the efficiency is lower than CSAC.
Advances in Applied Science Research, 2011
The management of the ever increasing residual sludge from our waterworks in an economical and en... more The management of the ever increasing residual sludge from our waterworks in an economical and environmentally friendly manner remains a very important issue. This has led to genuine efforts aimed at its beneficial re-use. The recovery of coagulants from water works sludge have been studied for several years, because of the toxic nature of free and complexed aluminum species to aquatic life, cost benefit of the recovery and the stringent environmental regulations on disposal of these sludge on land or into water bodies. This paper presents a review of the available reports of the researches on the various methods of recovery of coagulant from water works sludge.
A model based on data mining approach for the estimation of water treatment cost is presented. Th... more A model based on data mining approach for the estimation of water treatment cost is presented. The model was developed using multivariable regression method based on the industrial data collected from Kaduna North water treatment plant for a period of one year. Comparison of the result from the simulation of the model and observed data shows a good prediction with a correlation
IOP Conference Series: Earth and Environmental Science
Efficient energy supply to academic institution is necessary for the successful delivery of its p... more Efficient energy supply to academic institution is necessary for the successful delivery of its primary mandate of teaching, research and community service. Hence, there is need to monitor and control the energy consumption pattern in a university environment. In this study, a preliminary energy audit was conducted over 24 identified buildings at the main campus of University of Abuja, Nigeria to assess pattern of electricity consumption and efficiency in the University. The breakdown of the energy loads revealed that cooling systems (Air conditioning-33%, Central Air Conditioning-2%, Fans-13%), and Lighting 28% accounted for 76% of the total energy demand followed by office equipment (Desk top-11%, Photocopier-9%, Refrigerator-2%) and least being Lap top and Television accounting for 1% each. These on the overall gave the total energy demand of 1675.365KW and the equivalent total annual energy consumption of 1563491kWh (₦ 55,534,481.96). The senate building being the administrative...
Reviews in Chemical Engineering, Jun 5, 2014
Abstract: Addressing environmental degradation and ensuring environmental sustainability are inex... more Abstract: Addressing environmental degradation and ensuring environmental sustainability are inextricably linked to all methods of reducing volatile organic compounds (VOCs) from the environment. A packed column air stripper is a typical example of such technologies for the removal of VOCs from polluted water. The present review is devoted to the applications of a packed column air stripper and, in comparison with previous reviews, presents further elaborations and new information on topics such as modeling and simulation of the dynamic behavior of the air stripping process in a packed column air stripper. The paper observed that a knowledge gap still exists in the synthesis of this knowledge to formulate practically applicable mathematical relationships to describe the process generally. Therefore, further researches are still required in the area of air stripper performance optimization, particularly in the development of a mathematical model and the optimization of an air strippe...
International Journal of Engineering Science, 2013
Abstract: The growing interest on volatile organic compounds is because of their harmful effects ... more Abstract: The growing interest on volatile organic compounds is because of their harmful effects to humans and the environment. This paper discusses the consequences and documents a simple synopsis of the various hazardous effects of these compounds to humans and environment. These include toxic and carcinogenic human effects, stratospheric ozone depletion and ground level photochemical ozone formation, enhancement of global greenhouse effect and accumulation and persistence in the environment. The various control measures were also discussed.
Optimum pH and coagulant dosage for chemical precipitation in wastewater treatment plants is conv... more Optimum pH and coagulant dosage for chemical precipitation in wastewater treatment plants is conventionally obtained through repeated jar test. In this research, optimization of the performance of polyacrylamide in the treatment of industrial wastewater was carried out using response surface methodology. The individual linear and quadratic effect of coagulant dosage and pH on the degree of removals of nickel, total suspended solids, Chemical Oxygen Demand and turbidity were investigated. The optimum pH and polyacrylamide dosage were found to be 10.5 and 1.6 ml/L respectively and the optimum percentage nickel removal was 96.9%. The model used in predicting the precipitation process gave a good fit with the experimental variables and hence the suitability of response surface methodology for the optimization of polyacrylamide performance.
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Papers by Abdullahi Mohammed Evuti