Coag-Flocculation Kinetics and Functional Parameters Response of Mucuna Seed Coagulant to pH Variation in Organic Rich Coal Effluent Medium

M.C. Menkiti, P.C. Nnaji, C.I. Nwoye, O.D. Onukwuli

Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria..
Department of Metallurgical and Materials Engineering, Federal university of Technology Owerri, Nigeria.
Enugu State Water Corporation, Enugu, Nigeria.

DOI: 10.4236/jmmce.2010.92008                

Abstract

The coag-flocculation performance of Mucuna Seed Coagulant as affected by pH variation in coal washery effluent has been investigated at room temperature using various dosages of unblended Mucuna Seed Coagulant. In addition, coag-flocculation parameters such as Coagflocculation reaction order α, α^th order coag-flocculation constant K, Collision factor for Brownian Transport β_Br, Smoluchowski constant K_R,, Collision Efficiency ε_p, and Coagulation Period τ_1/2 were determined. Turbidity measurement was employed using the nephelometric (turbidimetric) standard method while Mucuna Seed Coagulant preparation was adopted from the works of Adebowale and Adebowale (2007). The maximum Mucuna Seed Coagulant parameter performance is recorded at α of 2, K of 8.3334 x 10^-3 m³/kg.s, dosages of (0.15 kg/m³; 0.2 kg/m³ ; 0.25 kg/m³); pH of 6 and τ_1/2 of 1.7339 sec while the minimum parametric performance is recorded at α of 1; K of 6.3001 x 10^-4 s^-1; dosage of 0.2kg/m³; pH of 8 and τ_1/2 of 1100.2161seconds. The minimum value of coag-flocculation efficiency E (%) recorded is greater than 88.00 %. Conclusively; Mucuna Seed Coagulant is an effective coagulant obeying the theory of fast coagulation at the conditions of the experiment.

Keywords

Coag-flocculation, Kinetics, Coal effluent, Mucuna, Coagulation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Ma,J.J.,Li, G.,Chen,G.R.,Xu,G.O., and Cai, G.Q., 2001, “Enhanced coagulation of surface waters with high organic content by permanganate perooxidation .” Water science and Technology: Water Supply,Vol 1,pp. 51-61
[2]	Diterlizzi, S.D., 1994, Introduction to Coagulation and Flocculation of Waste water, Environmental System Project, U.S.A ,pp 1-4.
[3]	Edzwald,J.K.,1987, “Coagulation – sedimentation filtration process for removing organic substances in drinking and waste water.”,Noyes Data Corporation ,Park Bridge ,New Jersey, pp 26-27.
[4]	O’Meila C.R., 1978, Coagulation in waste water treatment : The scientific basis of flocculation (NATO Advanced study Inst. Series E,Appl.Sc.No 27), In : Sijtholf and Noordhoff,Alpenan den Rijn, pp 219-268, (Ives ,K.J., Ed.),Netherlands.
[5]	Jin, Y.,2005, Use of high Resolution Photographic Technique for studying Coagulation/flocculation in water treatment, M.Sc thesis, University of Saskatchewan, Saskatoon, Canada.
[6]	Guerranti ,R.,Aguiyi, J.C., Neri, S., Leoncini ,R., Pagani, R., and Marinello, E.,2002 , “Proteins from Mucuna pruriens and Enzymes from Echis carrinatus Venom.” Published,JBC papers in press,DOI 10.1074/jbc.M201387200
[7]	Hunter, R.J., 1993; Introduction to Modern Colloid Science, Oxford University Press, New York, pp 33-38;289-290
[8]	Thomas,D.N., Judd,S.J., and Fawcett,N.,1999;“ Flocculation modeling: A review”. Water Resources, Vol 33, pp. 1579-1592.
[9]	Swift, D.L., and Friedlander, S.K., 1964 “The coagulation of hydrolysis by Brownian motion and laminar shear flow.” Journal of Colloid Science, Vol 19, pp. 621.
[10]	Von Smoluchowski,M., 1917; “Versucheiner Mathematischen Theorie der Koagulations Kinetic Kolloider Lousungen.” Z. Phys. Chem. 92: pp. 129-168.
[11]	Van Zanten, J.H., and Elimelech M., 1992; “Determination of Rate constants by multi angle light scattering.” Journal of colloid and interface Vol 154, pp 621
[12]	Fridkhsberg, D.A., 1984; A course in Colloid Chemistry; Mir Publishers Moscow, Russia. pp 266-268
[13]	Water Specialist Technology (WST) 2003; About Coagulation and Flocculation: Information Bulletins, U.S.A. pp:1-10
[14]	Menkiti, M.C., 2007; Studies on coagulation and flocculation of Coal Washery Effluent: Turbidimetric approach .M.Sc thesis, Nnamdi Azikiwe University Awka, Nigeria. pp.: 51.
[15]	Holthof, H., Egelhaaf, S.U., Borkovec, M., Schurtenberger, P., and Sticher, H., 1996; “Coagulation Rate Measurement of Colloidal Particles by Simultaneous Static and Dynamic Light Scattering.”Langmuir Vol 12, pp. 5541.
[16]	Adebowale, Y.A., and Adebowale, K.A., 2007; “Evaluation of the Gelation characteristics of Mucuna Bean Flour and Protein isolate.” Electronic Journal of Environmental, Agricultural and Food Chemistry,Vol 6,2007, pp 2243-2262.
[17]	AWWA 2005; American Water Works Association;Standard Methods for the Examination of Water and Waste water Effluent, New York, U.S.A.
[18]	Yates,P., Yan,Y., Jamson, G. J., and Biggs,S., 2001; “Heteroaggregation of particle system: Aggregation Mechanisms and aggregate structure determination.”6th World Congress of Chemical Engineering,Melbourne,Australia,23-27 September,2001. pp: 1-10
[19]	Holthof, H., Schmitt, A., Ferńandez-Barbero,M., Borkovec, M., Cabrerizo-Vilehez, P., Schurtenberger, P., and Hidalgo-Alvarez, R.,1997; “Measurement of Absolute Coagulation Rate Constants for Colloidal Particles: Comparison of Single and Multiparticle Light Scattering Techniques.” Journal of Colloid and Interface Science, Vol 192, pp. 463-470.