An Assessment of the Performance of a Biogas Digester When Insulated with Sawdust
International Journal of Energy and Power Engineering
Volume 4, Issue 2, April 2015, Pages: 24-31
Received: Dec. 5, 2014; Accepted: Dec. 11, 2014; Published: Feb. 16, 2015
Views 5134      Downloads 344
Patrick Mukumba, Physics Department, University of Fort Hare, P. Bag X1314, King Williams Road, Alice, 5700, South Africa
Golden Makaka, Physics Department, University of Fort Hare, P. Bag X1314, King Williams Road, Alice, 5700, South Africa
Chipo Shonhiwa, Physics Department, University of Fort Hare, P. Bag X1314, King Williams Road, Alice, 5700, South Africa
Article Tools
Follow on us
Biogas is mixture of gases, predominantly methane and carbon dioxide, produced by anaerobic digestion. In biogas production temperature of slurry is an important parameter that affects the rate of biogas production. The biogas digester was fed with cow dung before it was insulated. Ambient, biogas and slurry temperatures were measured. The temperature sensors were connected to the CR1000 data logger. Results were collected and compared before the construction of the second wall of the digester for the insulation. There was a strong positive relationship between slurry and ambient temperatures (R2 = 0.882). The results showed the interdependence of slurry, biogas and ambient temperatures. The magnitude of biogas temperatures was slightly different from slurry temperatures because of the differences in the thermal conductivity properties of concrete and brick wall. The biogas was in contact with concrete dome with a thermal conductivity of 0.2 W/ (m.K) while the digester slurry was in contact with the brick wall with a thermal conductivity of 0.8 W/ (m.K). The biogas digester that was not insulated produced biogas of average methane yield of 38%. The second wall for the biogas digester was constructed and sawdust with a thermal conductivity of 0.08 W/ (m.K) was put in the gap between the inner and outer walls of the biogas digester. The sawdust insulated digester produced average methane yield of 50% when fed with cow dung. The results showed that insulation of the surface digester improves methane yield. However, insulation does not give 100% slurry temperature stability even if the digester is built underground.
Digester, Cow Dung, Temperature, Biogas, Insulation, Methane
To cite this article
Patrick Mukumba, Golden Makaka, Chipo Shonhiwa, An Assessment of the Performance of a Biogas Digester When Insulated with Sawdust, International Journal of Energy and Power Engineering. Vol. 4, No. 2, 2015, pp. 24-31. doi: 10.11648/j.ijepe.20150402.12
F. Fantozzi and C. Buratt: Biogas production from different substrates in an experimental Continuously Stirred Tank Reactor anaerobic digester. Bio-resource Technology, Vol. 100 (2009), pp 5783-5789.
I.N. Budiyano, Widiasa, S. Johari. and Sunarso, The kinetic of biogas production rate from cattle manure in batch mode. International Journal of Chemical and Bio-molecular Engineering, Vol. 2 (2010), pp. 39-44.
J. Patil, M.A. Lourdu, , R. Antony and C.C. Gavimath: Study on effect of pre-treatment methods on biomethanation of water hyacinth, International Journal of Advanced Biotechnology and Research, Vol. 2(2011), pp. 143-147.
R.K. Dhaked, P. Singh, and L. Singh, Biomethanation under Psychrophilic conditions, Biotechnology Division, Defence Research and Development Establishment, Gwalior 474002, India (2010).
W. Chen: (Sensitivity Analysis for a Plug-Flow Anaerobic Digester. A Master of Engineering Project, University of Cornell (2007).
D. Fulford: Running a Biogas Programme, (ITDG Publishing, UK. 2001).
B.T. Nijaguna: Biogas Technology (New Age International (P) Limited, Publishers, New Delhi 2002).
M. H. Gerardi: The Microbiology of Anaerobic Digesters, (John Wiley and Sons, New Jersey 2003).
A. Davidsson: Increase of biogas production at waste water treatment plant- Addition of urban organic waste and pre-treatment of sludge, Water and Environmental Engineering, Department of Chemical Engineering, Lund University, Sweden (2007).
U. Balasubramaniyam, L.S. Zisengwe, N. Meriggi, and E. Buysman: Biogas Production in Climates with long cold Winter, Wageningen: Wageningen University (2008).
T. Liu and S. Sung: Ammonia inhibition on thermophilic aceticlastic methanogens Water Science & Technology Vol. 45, (2002), pp .113–120.
G. Eason, B. Noble, and I. N. Sneddon, “On certain integrals of Lipschitz-Hankel type involving products of Bessel functions,” Phil. Trans. Roy. Soc. London, vol. A247, pp. 529–551, April 1955. (references)
J. Clerk Maxwell, A Treatise on Electricity and Magnetism, 3rd ed., vol. 2. Oxford: Clarendon, 1892, pp.68–73.
I. S. Jacobs and C. P. Bean, “Fine particles, thin films and exchange anisotropy,” in Magnetism, vol. III, G. T. Rado and H. Suhl, Eds. New York: Academic, 1963, pp. 271–350.
K. Elissa, “Title of paper if known,” unpublished.
R. Nicole, “Title of paper with only first word capitalized,” J. Name Stand. Abbrev., in press.
Y. Yorozu, M. Hirano, K. Oka, and Y. Tagawa, “Electron spectroscopy studies on magneto-optical media and plastic substrate interface,” IEEE Transl. J. Magn. Japan, vol. 2, pp. 740–741, August 1987 [Digests 9th Annual Conf. Magnetics Japan, p. 301, 1982].
M. Young, The Technical Writer's Handbook. Mill Valley, CA: University Science, 198.
Science Publishing Group
1 Rockefeller Plaza,
10th and 11th Floors,
New York, NY 10020
Tel: (001)347-983-5186