Optimal Evaluation of Coag-Flocculation Factors for Alum-Brewery Effluent System by Response Surface Methodology


This work investigates coag-flocculation optimization treatment of alum-brewery effluent system via response surface methodology (RSM). To minimize suspended and dissolved particles (SDP), experiments were carried out using nephelometric jar test and 23-factorial design with three star-points, six-center-points and two replications. A central composite design, which is the standard design of RSM, was used to evaluate the effects and interactions of three major factors (coagulation pH, coagulant dosage, settling time) on the treatment efficiency. Multivariable quadratic model developed for the response studied indicates the optimum conditions to be 9, 500mg/l and 20minutes for coagulation pH, coagulant dosage and settling time, respectively. At optimum, the SDP was reduced from 10831.490mg/l to 801.451mg/l, representing 92.601% removal efficiency. RSM has demonstrated to be appropriate approach for the optimization of the coag-flocculation process by statistical evaluation.

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M. Menkiti, M. Aneke, E. Ogbuene, O. Onukwuli and E. Ekumankama, "Optimal Evaluation of Coag-Flocculation Factors for Alum-Brewery Effluent System by Response Surface Methodology," Journal of Minerals and Materials Characterization and Engineering, Vol. 11 No. 5, 2012, pp. 543-558. doi: 10.4236/jmmce.2012.115039.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Menkiti M.C. and Onukwuli O.D., 2010. Coag-flocculation studies of Moringa oleifera coagulant(MOC) in brewery effluent: Nephelometric approach. Journal of American Science. 6 (12), 788-806.
[2] Menkiti M.C., Onyechi C.A. and Onukwuli O.D.2011a.Evaluation of perikinetics compliance for the coag-flocculation of brewery effluent by Brachystegia eurycoma seed extract. International Journal of Multidisciplinary sciences and Engineering, 2(6), 73-80.
[3] Menkiti M.C.and Onukwuli.O.D.2011a. Response surface methodology and kinetics application to the optimization treatment of brewery waste water by Afzelia bella coag-flocculant: In Egboka.B.C and Odoh.B.I.(Eds), Water:Ecological disasters and sustainable development, Lambert Press, Germany, 92-107.
[4] Driessen W. and Vereijken T., 2003. Recent development in biological treatment of brewery effluent. Inst. and Guild of Brew. Africa Sect. –Proc. 9th Brewing Convention, Zambia. 165-171
[5] World Bank Group.1998. Pollution prevention and abatement handbook: Breweries. Environmental Department, Washington D.C. 272-274.
[6] Orhue E.R., Osaigbovo A.U. and Vwioko D.E., 2005. Growth of maize (Zea may L) and changes in some chemical properties of an ultisol amended with brewery effluent. African Journal of Biotechnology, 4(9) :973-978.
[7] Ghafari S., Aziz H.A., Isa M.H. and Zinatizadeh A.K. 2009. Application of response surface methodology(RSM) to optimize coagulation-flocculation treatment of leachate using poly-aluminium chloride(PAC) and alum. Journal of Hazardous Materials, 163,650-656.
[8] Duan J. and Gregory.J.2003. Coagulation by hydrolyzing metal salts. Advances in colloid interface science,(100-102), 475-502
[9] Menkiti M.C. and Onukwuli O.D., 2011b. Single and multi angle nephelometric approach to the study of coag-flocculation of coal effluent medium using Brachystegia eurycoma coagulant. World Journal of Engineerig, 8(1): 61-76.
[10] Menkiti M.C. and Onukwuli O.D., 2011c. Coag-flocculation of Mucuna seed coag-flocculant(MSC) in coal washery effluent(CWE) using light scattering effects. AICHE Journal. 57 (5) DOI: 10.1002/aic.12665.
[11] Menkiti M.C. and Onukwuli O.D., 2011d. Coag-flocculation studies of Afzelia bella coagulant (ABC) in coal effluent using single and simulated multi angle nephelometry. Journal of Mineral and Material Characterisation and Engineering. 10 (3), 279-298.
[12] Oladoja A.N. and Aliu Y.D., 2009. Snail shell as coagulant aid in the alum precipitation of malachite green from aqua system. Journal of Hazardous Materials. 164 (2-3), 1496-1502.
[13] Menkiti M.C.,Mbah G.O. and Onukwuli O.D. 2011b.Turbidimetric perikinetics behavior of Afzelia bella seed biomass for coag-flocculation treatment of Ph varying brewery effluent. International Journal of Chemistry. 3(4),104-115.
[14] Trinh T.K. and Kang L.S.2010. Application of response surface method as an experimental design to optimize coagulation test. Environmental Engineering Research,15(2),063-070.
[15] Mason R.L., Gunst R.F. and Hess J.L. 2003. Statistical design and analysis of experiment, Eight application to Engineering and Science, 2nd edition, Wiley, New York.
[16] Khuri A.I. and Cornell J.A. 1996. Response surface, design and analysis, 2nd edition, Marcel Dekker Inc., New York.
[17] Clesceri L.S.,Greenberg A. E. and Eaton A.D.,1999. Standard methods for the examinatin of water and waste water. 20th editon. APHA. USA.
[18] Silva G.F., Camargo F.L. and Ferreira A.L.O., 2011. Application of response surface methodology for optimization of biodiesel production by transesterification of soybean oil with ethanol. Fuel Processing Technology, 92:407-413.
[19] Nordin M.Y., Venkatesh .V.C.,Sharif S., Elting S. and Abdullah A.2004. Application of response surface methodology in describing the performance of coated carbide tools when turning AISI 104 steel. Journal of Material Process Technology,145, 46-58.
[20] Beltran-Heredia J., Sanchez-Martin J. and Delgado-Regalado A. 2009. Removal of dyes by Moringa oleifera seed extract. Journal of Chemical Technology and Biotechnology, 84, 1653-1659.
[21] Menkiti M.C., Ugodulunwa F.X.O., Onukwuli O.D. and Nnaji P.C. 2008. Studies on the coagulation and flocculation of coal washery effluent: A kinetic approach. Nigeria Society of Engineers Technical Transactions,43(4),36-58.
[22] Wang P.C., ChenY.Z., Ge X.W. and Yu H.Q.2007. Optimization of coagulation-flocculation process for paper-recycling waste water treatment using response surface methodology, Colloids and surfacesA: Physiochem. Eng.Aspect,302,204-210.
[23] Menkiti M.C., Nwoye C.I., Onyechi C.A. and Onukwuli O.D. 2001c. Factorial optimization and kinetics of coal washery effluent coag-flocculation by Moringa oleifera seed biomass. Advances in Chemical Engineering and science,1,125-132.
[24] Menkiti M.C., Nnaji P.C. and Onukwuli O.D. 2009. Coag-flocculation kinetics and functional parameters response of periwinkle shell coagulant(PSC) to pH variation in organic rich coal effluent medium. Nature and Science, 7(6),1-8.

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