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Petroleum Science 2016年第2期13卷 328-339页

作者： Matthew Menkiti Ifechukwu Ezemagu bernard okolo Water Resources Center Department of Civil and Environmental EngineeringTexas Tech University Department of Chemical Engineering Nnamdi Azikiwe University Department of Chemical Engineering Michael Okpara University of Agriculture

In this study, Mucuna flagellipes seed extract was applied in the coagulation-flocculation of produced water （PW）. Process parameters such as pH, dosage, and settling time were investigated. Process kinetics was also studied. Instrumental characterization of mucuna seed （MS）, mucuna seed coagulant （MSC）, and post effluent treatment settled sludge （PTSS） were carried out. The optimum decontamination efficiency of 95 % was obtained at 1 g/L MSC dosage, PW pH of 2, and rate constant of 0.0001 （L/g/s）. Characterization results indicated that MS, MSC, and PTSS were of network structure, primitive lat- tice, and thermally stable. It could be concluded that MSC would be potential biomass for the treatment of produced water under the experimental conditions.

关键词： Mucuna seed Produced water Coagulationflocculation Sludge Perikinetics

Evaluation of the Level and Impact of Selected Physiochemical Parameters of Fertilizer Effluent on Obinna River, Adani, Enugu State, Nigeria

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Journal of Water Resource and Protection 2014年第7期6卷 722-730页

作者： Chizoba Chinelo Agu Matthew Chukwudi Menkiti bernard Ibezim okolo Patrick Chukwudi Nnaji Center for Environmental Management and Control (CEMAC) University of Nigeria Enugu Nigeria Department of Chemical Engineering Michael Okpara University of Agriculture Umudike Nigeria Department of Chemical Engineering Nnamdi Azikiwe University Awka Nigeria

This work quantitatively evaluates the level and impact of selected physiochemical properties of fertilizer effluent on the Obinna River of Adani, Enugu State, Nigeria. The fertilizer effluent originated from surrounding farms and flushed into the Obinna River. Water samples were collected from designated points along the river and analysed for physical, chemical and biological properties using standard methods of APHA. Impact of selected key parameters such as nitrate, phosphate, manganese, dissolved oxygen, biochemical oxygen demand and heavy metals (lead, iron and manganese), was studied. The results of the parameters were compared with the World Health Organisation (WHO) permissible standard for freshwater. Measured concentrations of phosphate (5.00, 7.21, 3.92 mg/L), manganese (1.53, 1.18, 1.47 mg/L) and lead (18.9, 21.7, 39.7 ppm) were found to be above the WHO standard while nitrate (0.04, 0.03, 0.03 mg/L) and iron (0.001, 0.001, 0.1 mg/L) were within the standard. The mean concentrations of heavy metals increased in the following order: Fe (0.034) 1 to downstream S3, with manganese and lead being above WHO standard. The results showed a level of significance for the chi-square distribution and correlation coefficients while the analysis of variance (ANOVA) results was conflicting. It could be inferred that the impact of the selected parameters contributed to the pollution of Obinna River.

关键词： Physiochemical Heavy Metals WHO Pollution Obinna River

Parametric Response Evaluation for Xanthosoma spp. Induced Coag-Flocculation of Brewery Effluent

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Green and Sustainable Chemistry 2014年第1期4卷 7-14页

作者： bernard Ibezimako okolo Patrick Chukwudi Nnaji Matthew Chukwudi Menkiti Victor Ifeanyi Ugonabo Okechukwu Dominic Onukwuli Chemical Engineering Department Michael Okpara University of Agriculture Umudike Nigeria Chemical Engineering Department Nnamdi Azikiwe University Awka Nigeria

This paper presents the kinetic and functional parametric behavior of cocoyam coagulant (CYC) in respect of pH and time variation in brewery effluent at room temperature. The study employed standard nephelometric jar test while CYC production was based on method reported by Ndabigengesere. Coag-flocculation parameter such as order of reaction α, rate constant K, coagulation period, τ1/2 etc. were determined. Maximum parameter values are recorded at K of 6 × 10-1 L/mg·min;dosage of 200 mg/L, pH 8 and τ1/2 of 0.00146 min while the minimum values are recorded at 3 × 10-7 L/mg, dosage of 100 mg/L, pH 10 and τ1/2 of 20.4 min. The maximum coag-flocculation efficiency E (%) obtained was 92.28, thus establishing CYC as a potential effective coag-flocculaant.

关键词： Cocoyam Brewery Effluent Coag-Flocculation Xanthosoma spp. Perikinetic

Application of Single Angle Turbidimetry on Coag-Flocculation Effect of <i>Detarium microcarpum</i>Seed in Brewery Effluent

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Materials Sciences and Applications 2014年第6期5卷 416-429页

作者： bernard Ibezim okolo Patrick Chukwudi Nnaji Matthew Chukwudi Menkiti Victor Ifeanyi Ugonabo Okechukwu Dominic Onukwuli Department of Chemical Engineering Michael Okpara University of Agriculture Umudike Nigeria Department of Chemical Engineering Nnamdi Azikiwe University Awka Nigeria

Coagulation-flocculation is a proven technique for the removal of suspended solids in wastewater, through the application of single angle turbidimetric measurement. Through this measurement, the coag-flocculation kinetics and functional parameters behavior of Detarium microcarpumin brewery effluent with respect to pH, dosage and time were followed at room temperature. Process parameters such as order of reaction α, rate constant (K), coagulation period τ1/2 etc were determined. Results indicated that reaction order, rate constant, period, pH and dosage recorded optimum values at 2, 1.8 × 10-2 L/***, 0.152 min, 4 and 100 mg/L, respectively. Maximum efficiency recorded was 96.07% at 30 min. Detarium microcarpum has shown potential as an effective bio-coagulant for the removal of turbidity from brewery effluent.

关键词： Detarium microcarpum Coagulation-Flocculation Brewery Effluent Turbidimetry

Application of Factorial Design of Experiment for Optimization of Inhibition Effect of Acid Extract of <i>Gnetum africana</i>on Copper Corrosion

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Natural Resources 2014年第7期5卷 299-307页

作者： Ogbonna Chris Nkuzinna Matthew Chukwudi Menkiti Okechukwu Dominic Onukwuli Gordian Onyebuchukwu Mbah bernard Ibezim okolo Melford Chuka Egbujor Rabboni Mike Government Department of Chemical Engineering Enugu State University of Science and Technology Enugu Nigeria Department of Chemical Engineering Michael Okpara University of Agriculture Umudike Nigeria Department of Chemical Engineering Nnamdi Azikiwe University Awka Nigeria Department of Industrial Chemistry Renaissance University Ugbawka Nigeria

The inhibition of copper corrosion by acid extract of Gnetum africana was studied using weight loss method of monitoring corrosion rate. The inhibition of Gnetum africana on copper corrosion was optimized by application of 23 factorial design. While the interactive effects of temperature, inhibition concentration and reaction time were investigated, the input factors and output response were also optimized. Optimum conditions for inhibition of Gnetum africana on copper corrosion were recorded at temperature of 303 K, reaction time of 24 h and inhibition concentration of 0.003 g/L. It could be concluded that factorial design was adequately applicable in the optimization of process variables and that Gnetuma africana sufficiently inhibited the corrosion of copper at the conditions of the experiment.

关键词： Corrosion Inhibition Gnetum africana Copper Optimization