You are asked to determine the volume of a biogas plant digester with the following assumptions 1.     Average gas production from 1 kg dung is about 0.0324 m3. 2.      Retention period of dung slurry in digester is 36 days. 3.     546 litres of biogas required per day per person for cooking. 4.     Average production of feedstock (dung) per animal per day:   14 kg/day 5.     1000 litres of gas are equivalent to 1 m3 of gas. 6.     Number of persons in a family: 12 Determine Gas required, Quantity of feedstock required, and the number of cattle required.

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.