Factorial Optimization and Kinetics of Coal Washery Effluent Coag-Flocculation By <i>Moringa Oleifera</i> Seed Biomass
- 1 Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
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Abstract
Factorial optimization and kinetics of coal washery effluent (CWE) coag-flocculation by <i>Moringa oleifera</i> seed has been investigated at room temperature based on standard method of bench scale jar test. <i>Moringa oleifera</i> coag-flocculant (MOC) was produced according to work reported by Ghebremichael. A 2<sup>3</sup> full factorial central composite design was employed for the experimental design and analysis of results with respect to optimization. The combined effects of pH, dosage and settling time on the particle (turbidity) removal was studied using response surface methodology. Kinetic data generated were confronted with specified kinetic models for the evaluation of functional kinetics parameters. The optimal values of pH, dosage and settling time were recorded at 8,400mg/l and 25 min, respectively. The results of the major kinetic parameters recorded are 2,0.002l/mg.min, and 0.79 min for order of reaction, coag-flocculation reaction rate constant and coagulation period, respectively. The minimum removal efficiency recorded was 95% at 3mins of coag-flocculation. The results, while re affirming MOC as efficient coag-flocculant, confirmed that theory of perikinetics holds for the studied system at the conditions of the experiment.
- P. A. Moussas and A. I. Zouboulis, “A Study on the Properties and Coagulation Behavior of Modified Inor-ganic Polymeric Coagulant-Poly Ferric Silicate Sulphate (PFSS),” Separation and Purification Technology, Vol. 63, No. 2, 2008, pp. 475-483. doi:10.1016/j.seppur.2008.06.009
- S. D. Faust and O. M. Aly, “Chemistry of Water Treat-ment,” 2nd Edition, Ann Arbor Press, New York, 1998.
- K. Ghebremichael, “Moringa Seed and Pumice as Alter-native Natural Materials for Drinking Water Treatment,” TRITA-LWR PHD 1013, Ph.D Thesis, Department of Land and Water Resources Engineering, School of Ar-chitecture and the Built Environment, Royal Institute of Technology (KTH), Stockholm, 2004.
- O. D. Onwu, “Coal Fundamentals and Conversion Tech-nology,” Immaculate Publication Ltd., Nigeria, 1999.
- D. R. Crapper, S. S. Krishnan and A. J. Dalton, “Brain Aluminum Distriboutin in Alzheimer’s Disease and Ex-perimental Neurofibrillary Degenerations,” Science, Vol. 180, No. 4085, 1973, pp. 511-513. doi:10.1126/science.180.4085.511
- R. G. Miller, F. C. Kopfler, K. C. Kelty, J. A. Stober and N. S. Ulmer, “The Occurrence of Aluminium in Drinking Water,” Journal of the American Water Works Associa-tion, Vol. 76, No. 1, 1984, pp. 84-91.
- A. N. Oladoja and Y. D. Aliu, “Snail Shell as Coagulant Aid in the Alum Precipitation of Malachite Green from Aqua System,” Journal of Hazardous Materials,” Vol. 164, No. 2-3, 2009, pp. 1496-1502. doi:10.1016/j.jhazmat.2008.09.114
- M. C. Menkiti, “Sequential Treatments of Coal Washey and Brewery Effluents by Biocoag-Flocculation and Ac-tivated Carbon Adsorption,” Ph.D. dissertation, Chemical Engineering Department, Nnamdi Azikiwe University, Awka, 2010a.
- D. Schwarz, “Water Clarification Using Moringa Oleif-era,” Gate Information Service, Eschborn, 2000.
- L. S. Clesceri, A. E. Greenberg and A. D. Eaton, “Stan-dard Methods for the Examination of Water and Waste Water,” 20 Edition, American Public Health Association, USA, 1999.
- Association of Official Analytical Chemist, “Official Methods of Analysis,” 14th Edition, USA, 1993.
- D. C. Montgomery, “Design and Analysis of Experi-ments,” 3rd Edition, Wiley, New York, 1992.
- D. N. Thomas, S. J. Judd and N. Fawcett, “Flocculation Modeling: A Review,” Water Resource, Vol. 33, No. 7, 1999, pp. 1579-1592. doi:10.1016/S0043-1354(98)00392-3