Introduction
As we are all aware, fossil fuels are depleting rapidly and the energy consumption is growing. Due to  increasing fossil fuel prices other types of fuels become more interesting. Nowadays technology enables us to use renewable fuels in an economically profitable way. An easy technique to produce fuel is the digestion of green waste; sewage sludge, manure and agricultural waste from crops. Bacteriae will convert this waste to methane and carbon dioxide known as biogas. Biogas is seen as a renewable fuel without a carbon dioxide footprint. To enhance the usability of biogas it should be upgraded to natural gas quality which is done by removal of carbon dioxide from the biogas. This will increase the caloric value of the gas, and makes it suitable to be used as vehicle fuel.

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