3.2. Economic analysis
The economic assessment was based on digesters capital cost,1963 $ for the fixed dome model and 1729 $ for the plastic tubular model (Table 3). Bricks and cement accounted for 60% of the total cost in the fixed dome digester. On the other hand, the geomembrane was the most expensive material in the plastic tubular digester (around 70% of the total cost). Manpowerwas about 30 and 7% of total cost in the fixed dome and plastic tubular digester, respectively.