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Co-digestion of Pretreated Chicken – Goat and Untreated Cow Manure at Different Substrate to Inoculums Ratios and Total Solids for Biogas Production

Clinton Simiyu Waswa1*, Peter Aguko Kabok2 and Daudi M. Nyaanga1

1Agricultural Engineering Department, Egerton University, P.O. Box 536 – 20115, Egerton, Kenya.
2School of Engineering, Jaramogi Oginga Odinga University, P.O. Box 210-40601, Bondo, Kenya.
1Agricultural Engineering Department, Egerton University, P.O. Box 536 – 20115, Egerton, Kenya.

Correspondence to: [email protected]

Vol 3(3), pp. 11-21, December, 2020

Copyright © 2020 Author(s) and Skies Educational.
This article is published under the terms of the Creative Creative Commons Attribution License 4.0


Biogas production can be greatly affected by inoculum addition and total solids. The effect of substrate to inoculum ratios and total solids of chicken, goat and cow manure on biogas production was studied using a 0.15m3 laboratory scale batch digester at a constant temperature of 35°C. Feed stocks were mechanically minced to 3 mm effective particle sizes prior to co-digesting with untreated cow manure from a free-range dairy rearing system. Different amounts of cow substrate inoculum were used at ratios of 2:1, 3:1, 4:1, 5:1 and 6:1, while total solid levels between (7.5% and 10.5%) at intervals of 0.5% were used to study their effects on biogas production. Increasing inoculums and total solids resulted in increased biogas production with peaks at a substrate to inoculum ratio of 4:1 (20% inoculum addition) and 9% total solids. Biogas production rates of 0.61 and 0.63m3/m3d were realized respectively.

Keywords: Biogas Production, Chicken-Goat-Cow Manure, Substrate to Inoculum Ratios, Total Solids


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  1. Mr. Waswa:
    Holds BSc in Agricultural Engineering and currently an MSc. Agricultural Engineering (Renewable Energy) student at Egerton University, Graduate Engineer (EBK). He is currently supervising the construction of an irrigation project on behalf of the Ministry of Agriculture and tutoring at Kisiwa Technical Institute. He is a new entrant in academia and research.
  2. Dr. (Engr.) Kabok:
    Holds PhD in Agricultural Engineering and currently is a Senior Lecturer (JOOST), Consulting Engineer (EBK), published over 40 articles, papers and reports in various fields of Engineering, wind energy, irrigation among others in reputable journals and publications. He served in various capacities including being Managing Director in Lake Basin Development Authority (LBDA)”
  3. Prof. Nyaanga:
    Holds PhD in Agricultural Engineering and currently Professor (Egerton University), published over 60 articles, papers and reports in various fields of Engineering, bioenergy, processing among others in reputable journals and publications. He has been in academia for most of the time with an initial short brief at the Ministry of Agriculture


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Waswa C.S., Aguko, P.A. and Nyaanga, D.M.. (2020). Co-digestion of Pretreated Chicken – Goat and Untreated Cow Manure at Different Substrate to Inoculums Ratios and Total Solids for Biogas Production. Applied Research Journal of Environmental Engineering, 3(3), 11-21.

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