By membrane separation will not give any strict separation, but partial enrichment. This means that the content of methane in the produced gas may not be suitable for use as vehicle fuel directly. By applying cryogenic techniques, a very clean CH 4 can be achieved. This is favorable if the product should be used for vehicles. At the same time, also CO2 can be separated, which may be of high interest in possible future carbon capture and storage (CCS) plants. A drawback of cryogenic techniques is the equipment costs, which limits the use to large scale plants. The combination of gasification and CHP enables cleaning of the gas from problematic substances that are evaporated and passing with the gaseous phase such as chlorides and metal salts, such as alkali salts. It could facilitate the introduction of biomass and waste in today´s existing CHP plants using fossil fuel-based feed-stocks. Co-combustion with biomass and waste is generally not possible in the
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