Journal of
Mechanical Engineering Research

  • Abbreviation: J. Mech. Eng. Res.
  • Language: English
  • ISSN: 2141-2383
  • DOI: 10.5897/JMER
  • Start Year: 2009
  • Published Articles: 111

Full Length Research Paper

Effect of cow dung variety on biogas production

N. Y. Godi
  • N. Y. Godi
  • Department of Mechanical Engineering, Modibbo Adama University of Technology, P. M. B. 2076, Yola, Adamawa State, Nigeria.
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L. B. Zhengwuvi
  • L. B. Zhengwuvi
  • Department of Mechanical Engineering, Modibbo Adama University of Technology, P. M. B. 2076, Yola, Adamawa State, Nigeria.
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Salihu Adulkadir
  • Salihu Adulkadir
  • Department of Agricultural Engineering, Adamawa State Polytechnic, P. M. B. 2046, Yola, Nigeria.
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P. Kamtu
  • P. Kamtu
  • Department of Mechanical Engineering, Plateau State Polytechnic, Jos, Plateau State, Nigeria.
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  •  Accepted: 21 November 2012
  •  Published: 31 January 2013

Abstract

 

Biogas is a renewable, alternative and sustainable form of energy from the action of bacteria when waste vegetable matter, organic waste and some industrial waste are fermented in the absence of oxygen. This study was conducted to find the effect of cow dung variety on biogas generation. Some samples of fresh cow dung (2 Kg for each breed of cow) of cows which were not exposed to treatment with anti-biotics for some weeks, were collected from Sobere Farms and mixed with water in ratio of 1:1 volume and the mixture was loaded into a bio-reactor to ferment. The Hydraulic Retention Time (HRT) was 9 to 14 days. The reduction in retention time was achieved by adding human excreta and urine into the digester to increase micro-organism and pathogenic activities. The biogas obtained after 11 days was gathered and analyzed in a 250-Gas Chromatograph and Integrator. The results showed the percentages and calculated energies (calorific values) of biogas from the cow dung of four (4) selected varieties of cows, namely, Holstein Friesian, Simmental, White Fulani and Jersey, which were fed with concentrates in equal proportions and at the same time for some weeks. The Holstein cow has methane (CH4),(84.916%) and 196.199 cal/mof energy, Jersey cow (69.233%) and 159.963 cal/mof energy, (60.459%) and 149.235 cal/mof energy for Simmental cow and White Fulani cow has (85.331%) with 197.157 cal/mof energy respectively. The results indicate that the White Fulani cow has the higher quantity of combustion energy than the other breeds of cows.

 

Key words: Effect, White Fulani, Holstein, Jersey, Simmental, biogas, percentages, cow dung.