The aim of the prototype is to provide a smaller system where we can run the digester and use proportionality to confirm our results. To proceed with our prototype, we first have to calculate the theoretical amount of biogas produced and the amount of carbon dioxide and hydrogen sulphide that we have to remove.
Taking the basis to be 432kg of waste in the original digester
Total amount of biogas produced: 33.36 m3.
Total amount of carbon dioxide produced: 12.57 m3
Total amount of methane produced: 21.063m3
Taking the basis to be 4.32kg of waste in the prototype
Total amount of biogas produced: 0.3363 m3
Total amount of carbon dioxide produced: 0.1257 m3
Total amount of methane produced 0.21063m3
Hence concentration of CO2 present in Biogas would be 37.377%vol
Hence concentration of CH4 present in Biogas would be 62.63%vol
Therefore maximum composition of H2S in biogas produced: 1%vol (est 10-40ppm)
Composition of CO2 in head space: 0-0.03%
Initially there will be atmospheric air in the system. In this air, there is a 0.03%vol of CO2 in the system which can be negligible. The air is consumed by the bacteria as time goes on.
Composition of CH4 in head space: 0%
There is no methane gas in the atmosphere
Composition of H2S in head space: 0%
There is no hydrogen sulphide in the atmosphere
Saturday, August 22, 2009
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