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Bech, N., Waveren and Evan, 2002. Environmental Support Project (ESP), Component 2: Environmental Assessment and Sustainable Land Use plan for North Wollo.

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Article

Biogas Production Using Geomembrane Plastic Digesters as Alternative Rural Energy Source and Soil Fertility Management

1Department of Chemical Engineering, KIOT, Wollo University, Kombolcha, Ethiopia

2Mersa Agricultural TVET College, Woldya, Ethiopia


Sustainable Energy. 2014, Vol. 2 No. 1, 12-19
DOI: 10.12691/rse-2-1-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
Seid Yimer, Bezabih Yimer, Omprakash Sahu. Biogas Production Using Geomembrane Plastic Digesters as Alternative Rural Energy Source and Soil Fertility Management. Sustainable Energy. 2014; 2(1):12-19. doi: 10.12691/rse-2-1-3.

Correspondence to: Omprakash  Sahu, Department of Chemical Engineering, KIOT, Wollo University, Kombolcha, Ethiopia. Email: ops0121@gmail.com

Abstract

The aim of work is to evaluate amount of gas production, economical feasibility and quality of slurry for geomembrane plastic biogas plants constructed below and above the ground surface and fixed-dome biogas plant of 3 m3 capacity. Amount of gas and slurry were measured using calibrated biogas burner and weight balance respectively. The qualities of the slurry were analyzed in the laboratory using Kjeldahl and ash method respectively. Economic evaluation and comparison of the biodigester was carried out using cost-benefit analysis. Gas production and total-N was higher for a single layered and above ground plastic biodigester than others. Fermented slurry contained larger nitrogen content than fresh cow dung in both models of biodigester. The geomembrane plastic biogas plant gave higher net benefit than fixed-dome biogas plant. The biogas technology was found to increase income generation through increased crop production with the use of nutritive slurry as organic fertilizer and solve the problem of fuel shortage in the rural areas. Environmental impact assessment of the technology was studied and found that from the use of a geomembrane plastic biodigester, 360 m3 of CO2 and 600 m3 CH4 was prevented from emitting in to the atmosphere and save 0.562 hectare of forest per year from being deforested and hence attributed towards the decrease in global warming. Generally, the geomembrane cylindrical film biodigester technology was found cheap and simple way to produce gas in the study area.

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