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Papers by atulegwu uzoije

Abstract: Model for predicting the concentration of iron upgraded during pyrobeneficiation of iro... more Abstract: Model for predicting the concentration of iron upgraded during pyrobeneficiation of iron oxide ore (pelletized with powdered potassium chlorate) has been derived. The model-predicted %Fe upgrades were found to agree a direct relationship between %Fe values and weight-input of KClO3 as exhibited by %Fe upgrades obtained from the experiment. The model; %Fe = 7.1367γ indicates that iron upgrade is dependent on the weight input of KClO3. The validity of the model was rooted in the expression (%Fe/γ)α = (T/β)N where both sides of the expression are correspondingly almost equal. The positive or negative deviation of each of the model-predicted values of %Fe from those of the corresponding experimental values was found to be less than 19 % which is quite within the range of acceptable deviation limit of experimental results. [New York Science Journal. 2009;2(4):17-23]. (ISSN: 1554-0200).

Oil and grease removal process, through the use of fenton oxidation reaction on an oil polluted w... more Oil and grease removal process, through the use of fenton oxidation reaction on an oil polluted wastewater from a vegetable oil plant has been studied. The study was designed to assess the effectiveness of fenton oxidation reaction process in eliminating oil and grease contaminant in the wastewater. The raw wastewater was subjected to analysis through standard methods to determine BOD, Oil and grease, phenol, salinity and sodium batch oxidation process was adopted to remove the oil and grease in which four input parameters ; ph, Fe 2+ , temperature and hydrogen peroxide(H2O2) were considered. Four runs of experiment were performed where each parameter was varied while the other three remained constant. In each run, oil and grease removal was determined at ten minutes interval for 60 minutes through analysis. The results showed that the highest oil and grease removal efficiencies of 96.28% 98.74%, 99.02 and 93.03%were achieved at the optimum conditions of ph=3, fe2+=3.2 g/l, temp=45 ...

Open Access Library Journal, 2015

Adsorption kinetics and mechanism of Cypermethrin (CY) and Dichlorovos (DI) on activated carbons ... more Adsorption kinetics and mechanism of Cypermethrin (CY) and Dichlorovos (DI) on activated carbons of oil bean seed shell (OBSS), unripe plantain peel (UPP) and castor bean seed shell (CBSS) systems have been studied. The equilibrium adsorption isotherms were modelled by Freunlich, Langmuir and Langmuir-Freunlich (LF) models. Adsorption isotherms of various systems were best described by Langmuir-Freunlich (LF). Mixed 1,2 order equation (MOE), integrated kinetic Langmuir (IKL), pseudo second order equation (PSOE), fractal-like mixed 1,2 order equation (F-MOE), and Boyd and Webbers models were compared and adopted in the analysis of the kinetic data. The models represented different uptake reduction rate of CY and DI by various adsorption systems. F-MOE, IKL and MOE models were in agreement with CY/OBSS, CY/UPP and CY/CBSS system data respectively, hence the conforming models, whereas IKL, MOE and PSOE were the conforming models for DI/OBSS, DI/UPP and DI/CBSS adsorption data systems, ...

Impact of urban run-off on Ogbor River in Aba metropolis has been studied. The run-off contains t... more Impact of urban run-off on Ogbor River in Aba metropolis has been studied. The run-off contains toxic chemical, heavy metals and suspended solids. Water samples were collected from three discharged points in the months of May to September. The results of the analysis of the samples show high-level concentration of lead, iron, cadmium, cyanide and chromium (1.7mg/l, 5.52mg/l, 1.47mg/l, 2.44mg/l and 1.31mg/I respectively). However, the water sample of the slaughter house, and the industrial effluents are free from heavy metals. In addition, the water quality of the downstream location of the river shows an appreciable reduction of the concentration of the heavy metals probably due to dispersion effect. The presence of this pollution in water is hazardous to health. Ballasted flocculation technology can be used to reduce the concentration level of these pollutants.

Many industrial wastewaters contain numerous toxic metals such as zinc, which must be removed bef... more Many industrial wastewaters contain numerous toxic metals such as zinc, which must be removed before reuse of the water or discharge into the environment. In this present study, unripe plantain peel activated carbon (UPPAC), pineapple peel activated carbon (PPAC) and commercial activated carbon (CAC) were utilized as low cost adsorbents for the removal of Zn (II) from aqueous solutions. Batch adsorption methodology was used to evaluate the effect of solution pH, initial metal ion concentration, adsorbent dose, contact time and temperature on adsorption. Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectrophotometer (FTIR) were used to characterize the adsorbents. The equilibrium isotherm data were analyzed using the Langmuir, Freundlich and Temkin isotherm model. The kinetic data were analyzed using the pseudo-first order, pseudo-second order equations, Elovich equation and intraparticle rate equation. Maximum adsorption of Zn (II) on UPPAC, PPAC and CAC (82.45%...

Orange mesocarp with its potentials application to remove spilled crude oil was used to prepare a... more Orange mesocarp with its potentials application to remove spilled crude oil was used to prepare an activated adsorbent. Therefore, adsorption of crude oil onto the activated orange meso-carp (AOMC) was investigated. Batch experiment was adopted for the equilibrium studies and the studies were conducted for various operational parameters such as varying crude oil concentration and temperature values. The crude oil samples of A, B, C, D and E, with concentrations 6045, 4393, 8508, 11583, and 5220, respectively and temperature values varied between 10-50oC were used for the experiment. The adsorption equilibrium was established at 40 min of adsorption time. Partition coefficients, kd (L/kg) for various samples reacted inversely with temperature and were in the ranges of 0.37-0.69, 0.65-1.11, 1.28-2.04, 1.17-1.39 and 1.23-4.53 for samples A, B, C, D and E, respectively. percentage of crude oil samples on the AOMC decreased with low crude oil hydrocarbons and the trend was shown as follo...

Adsorption of Fe 3+ /Fe 2+ from a polluted shallow well water onto a palm kernel shell activated ... more Adsorption of Fe 3+ /Fe 2+ from a polluted shallow well water onto a palm kernel shell activated carbon (PKSAC) has been studied. Batch experiment was adopted to study the Removal efficiency of Fe 3+ /Fe 2+ on varying contact time, temperature, adsorbent loading and concentrations. Equilibrium isotherm and kinetic were also studied. Removal efficiency progressed with contact time till the peak adsorption time of 100 minutes when the efficiency remained at equilibrium. Also, removal efficiency got to equilibrium at the peak values of 80ºC, 4.8g and 12.5mg/l for temperature, adsorbent loading and concentration variations respectively. The adsorption isotherm models fitted the isotherm data got at 25ºC, 40ºC and 80ºC in this order; Langmuir > Temkin>Freunlich. The dimensionless separation factor of 0.012, 0.017 and 0.015 for 25ºC, 40ºC and 80ºC respectively confirmed favorable adsorption of Fe 3+ /Fe 2+ on the PKSAC adsorbent. Langmuir adsorption capacity increased from 203.9mg F...

International Journal of Energy Engineering, 2013

Heavy metal concentrations and its distributions in the soil have been a source of concern to soi... more Heavy metal concentrations and its distributions in the soil have been a source of concern to soil usage, particularly to agriculture as concentration and distribution of heavy metal determine to a large extent, the soil quality and consequently that of the crops. The ability to quantify the amount of heavy metal in the soil is of immense importance to soil management. The use of accurate model is essential to estimate the actual soil heavy metal values and its distribution for efficient management. In this study, soil and earthworm samples of the battery-waste-polluted site and that of the background site were collected fro m five different locations(A,B,C,D and E) along the gradient of decreasing pollution .With five replicates each form one sampling location, twenty-five soil and fifty earthworms samples (two earthworms fro m each replicate) were collected using stratified random sampling technique. Lead(pb), Cad miu m(Cd), Chro miu m(Cr), Nickel(Ni), Manganese(Mn), Arsenic(As), pH and Mercury(Hg) were analy zed using standard methods. The same process was replicated for the background site. Values of the heavy metals in soil and earthworms were natural and typical of A meki-Nanka-soil formation. The average range of heavy metals concentrations in soil and earthworm samples fro m the polluted site were; pb(1025-695 mg/kg), Cd(11.34-6.3 mg/ kg), Mn(290-81 mg/kg), p H(2.3-6.9mg/kg), Cr(185-3.7 mg/ kg), Ni(12.87-1.7 mg/kg), As(72-4.5 mg/kg), Hg(1.7-0.002mg/kg) and pb(193-37.98 mg/kg), Cd(14.04-0.01 mg/ kg), Mn(17.34-1.10mg/ kg), p H(6.9-2.3mg/kg), Cr(8.45-0.01 mg/kg), Ni(1.41-0.03 mg/ kg), As(0.75-0.01 mg/kg) , Hg(0.4-0.009mg/ kg) respectively. Concentrations of heavy metals for soil and earthworm samples decreased along the gradient of decreasing pollution of the polluted site. Three models(Linear , Logarith mic and quadratic models) were developed to test their suitability to the data in which Ph was correlated with heavy metals. Inverse correlation was observed with coefficient R2 of between 0.77-0.95 and lowest percentage deviation of the field fro m the predicted values.

Research Journal of Environmental Sciences, 2011

Abstract: Model for predicting the concentration of iron upgraded during pyrobeneficiation of iro... more Abstract: Model for predicting the concentration of iron upgraded during pyrobeneficiation of iron oxide ore (pelletized with powdered potassium chlorate) has been derived. The model-predicted %Fe upgrades were found to agree a direct relationship between %Fe values and weight-input of KClO3 as exhibited by %Fe upgrades obtained from the experiment. The model; %Fe = 7.1367γ indicates that iron upgrade is dependent on the weight input of KClO3. The validity of the model was rooted in the expression (%Fe/γ)α = (T/β)N where both sides of the expression are correspondingly almost equal. The positive or negative deviation of each of the model-predicted values of %Fe from those of the corresponding experimental values was found to be less than 19 % which is quite within the range of acceptable deviation limit of experimental results. [New York Science Journal. 2009;2(4):17-23]. (ISSN: 1554-0200).

Oil and grease removal process, through the use of fenton oxidation reaction on an oil polluted w... more Oil and grease removal process, through the use of fenton oxidation reaction on an oil polluted wastewater from a vegetable oil plant has been studied. The study was designed to assess the effectiveness of fenton oxidation reaction process in eliminating oil and grease contaminant in the wastewater. The raw wastewater was subjected to analysis through standard methods to determine BOD, Oil and grease, phenol, salinity and sodium batch oxidation process was adopted to remove the oil and grease in which four input parameters ; ph, Fe 2+ , temperature and hydrogen peroxide(H2O2) were considered. Four runs of experiment were performed where each parameter was varied while the other three remained constant. In each run, oil and grease removal was determined at ten minutes interval for 60 minutes through analysis. The results showed that the highest oil and grease removal efficiencies of 96.28% 98.74%, 99.02 and 93.03%were achieved at the optimum conditions of ph=3, fe2+=3.2 g/l, temp=45 ...

Open Access Library Journal, 2015

Adsorption kinetics and mechanism of Cypermethrin (CY) and Dichlorovos (DI) on activated carbons ... more Adsorption kinetics and mechanism of Cypermethrin (CY) and Dichlorovos (DI) on activated carbons of oil bean seed shell (OBSS), unripe plantain peel (UPP) and castor bean seed shell (CBSS) systems have been studied. The equilibrium adsorption isotherms were modelled by Freunlich, Langmuir and Langmuir-Freunlich (LF) models. Adsorption isotherms of various systems were best described by Langmuir-Freunlich (LF). Mixed 1,2 order equation (MOE), integrated kinetic Langmuir (IKL), pseudo second order equation (PSOE), fractal-like mixed 1,2 order equation (F-MOE), and Boyd and Webbers models were compared and adopted in the analysis of the kinetic data. The models represented different uptake reduction rate of CY and DI by various adsorption systems. F-MOE, IKL and MOE models were in agreement with CY/OBSS, CY/UPP and CY/CBSS system data respectively, hence the conforming models, whereas IKL, MOE and PSOE were the conforming models for DI/OBSS, DI/UPP and DI/CBSS adsorption data systems, ...

Impact of urban run-off on Ogbor River in Aba metropolis has been studied. The run-off contains t... more Impact of urban run-off on Ogbor River in Aba metropolis has been studied. The run-off contains toxic chemical, heavy metals and suspended solids. Water samples were collected from three discharged points in the months of May to September. The results of the analysis of the samples show high-level concentration of lead, iron, cadmium, cyanide and chromium (1.7mg/l, 5.52mg/l, 1.47mg/l, 2.44mg/l and 1.31mg/I respectively). However, the water sample of the slaughter house, and the industrial effluents are free from heavy metals. In addition, the water quality of the downstream location of the river shows an appreciable reduction of the concentration of the heavy metals probably due to dispersion effect. The presence of this pollution in water is hazardous to health. Ballasted flocculation technology can be used to reduce the concentration level of these pollutants.

Many industrial wastewaters contain numerous toxic metals such as zinc, which must be removed bef... more Many industrial wastewaters contain numerous toxic metals such as zinc, which must be removed before reuse of the water or discharge into the environment. In this present study, unripe plantain peel activated carbon (UPPAC), pineapple peel activated carbon (PPAC) and commercial activated carbon (CAC) were utilized as low cost adsorbents for the removal of Zn (II) from aqueous solutions. Batch adsorption methodology was used to evaluate the effect of solution pH, initial metal ion concentration, adsorbent dose, contact time and temperature on adsorption. Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectrophotometer (FTIR) were used to characterize the adsorbents. The equilibrium isotherm data were analyzed using the Langmuir, Freundlich and Temkin isotherm model. The kinetic data were analyzed using the pseudo-first order, pseudo-second order equations, Elovich equation and intraparticle rate equation. Maximum adsorption of Zn (II) on UPPAC, PPAC and CAC (82.45%...

Orange mesocarp with its potentials application to remove spilled crude oil was used to prepare a... more Orange mesocarp with its potentials application to remove spilled crude oil was used to prepare an activated adsorbent. Therefore, adsorption of crude oil onto the activated orange meso-carp (AOMC) was investigated. Batch experiment was adopted for the equilibrium studies and the studies were conducted for various operational parameters such as varying crude oil concentration and temperature values. The crude oil samples of A, B, C, D and E, with concentrations 6045, 4393, 8508, 11583, and 5220, respectively and temperature values varied between 10-50oC were used for the experiment. The adsorption equilibrium was established at 40 min of adsorption time. Partition coefficients, kd (L/kg) for various samples reacted inversely with temperature and were in the ranges of 0.37-0.69, 0.65-1.11, 1.28-2.04, 1.17-1.39 and 1.23-4.53 for samples A, B, C, D and E, respectively. percentage of crude oil samples on the AOMC decreased with low crude oil hydrocarbons and the trend was shown as follo...

Adsorption of Fe 3+ /Fe 2+ from a polluted shallow well water onto a palm kernel shell activated ... more Adsorption of Fe 3+ /Fe 2+ from a polluted shallow well water onto a palm kernel shell activated carbon (PKSAC) has been studied. Batch experiment was adopted to study the Removal efficiency of Fe 3+ /Fe 2+ on varying contact time, temperature, adsorbent loading and concentrations. Equilibrium isotherm and kinetic were also studied. Removal efficiency progressed with contact time till the peak adsorption time of 100 minutes when the efficiency remained at equilibrium. Also, removal efficiency got to equilibrium at the peak values of 80ºC, 4.8g and 12.5mg/l for temperature, adsorbent loading and concentration variations respectively. The adsorption isotherm models fitted the isotherm data got at 25ºC, 40ºC and 80ºC in this order; Langmuir > Temkin>Freunlich. The dimensionless separation factor of 0.012, 0.017 and 0.015 for 25ºC, 40ºC and 80ºC respectively confirmed favorable adsorption of Fe 3+ /Fe 2+ on the PKSAC adsorbent. Langmuir adsorption capacity increased from 203.9mg F...

International Journal of Energy Engineering, 2013

Heavy metal concentrations and its distributions in the soil have been a source of concern to soi... more Heavy metal concentrations and its distributions in the soil have been a source of concern to soil usage, particularly to agriculture as concentration and distribution of heavy metal determine to a large extent, the soil quality and consequently that of the crops. The ability to quantify the amount of heavy metal in the soil is of immense importance to soil management. The use of accurate model is essential to estimate the actual soil heavy metal values and its distribution for efficient management. In this study, soil and earthworm samples of the battery-waste-polluted site and that of the background site were collected fro m five different locations(A,B,C,D and E) along the gradient of decreasing pollution .With five replicates each form one sampling location, twenty-five soil and fifty earthworms samples (two earthworms fro m each replicate) were collected using stratified random sampling technique. Lead(pb), Cad miu m(Cd), Chro miu m(Cr), Nickel(Ni), Manganese(Mn), Arsenic(As), pH and Mercury(Hg) were analy zed using standard methods. The same process was replicated for the background site. Values of the heavy metals in soil and earthworms were natural and typical of A meki-Nanka-soil formation. The average range of heavy metals concentrations in soil and earthworm samples fro m the polluted site were; pb(1025-695 mg/kg), Cd(11.34-6.3 mg/ kg), Mn(290-81 mg/kg), p H(2.3-6.9mg/kg), Cr(185-3.7 mg/ kg), Ni(12.87-1.7 mg/kg), As(72-4.5 mg/kg), Hg(1.7-0.002mg/kg) and pb(193-37.98 mg/kg), Cd(14.04-0.01 mg/ kg), Mn(17.34-1.10mg/ kg), p H(6.9-2.3mg/kg), Cr(8.45-0.01 mg/kg), Ni(1.41-0.03 mg/ kg), As(0.75-0.01 mg/kg) , Hg(0.4-0.009mg/ kg) respectively. Concentrations of heavy metals for soil and earthworm samples decreased along the gradient of decreasing pollution of the polluted site. Three models(Linear , Logarith mic and quadratic models) were developed to test their suitability to the data in which Ph was correlated with heavy metals. Inverse correlation was observed with coefficient R2 of between 0.77-0.95 and lowest percentage deviation of the field fro m the predicted values.

Research Journal of Environmental Sciences, 2011