The Performance of Indian Type Biogas Unit under Sudan Conditions

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Mekki, I.
El Amin, H. B.
Dirar, H. A.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
In the context of endeavours to develop biogas technologies appropriate to Sudan rural areas, Indian design (family-size, 10m3) biogas digesters were tested, with particular reference to their potential suitability to prevailing environmental conditions in the Sudan. Cowdung at total solids (TS) concentrations of 5%, 8% and 20% was used as feed-stock using batch techniques. The 8% concentration gave the highest production and composition as a function of temperature, pH and volatile fatty acids. In the course of all these experiments, volatile fatty acids produced did not retard biogas production and the pH levels were automatically kept around 7.0. The unit was operated over sufficiently long periods to allow an evaluation under different ambient temperatures. The slurry temperatures obtained in the digesters during one year of operation (25-29oC) reflect the effect of seasonal variation of ambient temperatures (22-42oC). The normal gas pressure measured was 7.5 mbar. In the absence of stirring the slurry during fermentation, the extent of decomposition of organic matter was only 25.3-30.5%.
Page(s): 2 (2), 101- 118, 13 Ref.
Ambient temperatures, total solids, fatty acids., Indian design, organic matter