Small biogas plants that use manure, dung and other agricultural residues are ecologically favorable. These plants would normally provide a power of about 50 kWel and they perfectly fit for the designed processing modules. A case study: Analogous to a milk driver, who is passing by every day to get the milk, a truck picks up LBM (liquefied biomethane) once a week as well as for dry ice: Which can be picked up two or three times a week. The uncomplicated transport of LBM and dry ice is state of the art, even for long distances. This allows a wide range of applications (Figure 6). High purity CO_2 can be used for cooling food or for surface treatment. LBM can be stored for several months in insulated tanks. In this way a seasonal storage from large energy amounts is possible. LBM can be used as a substitute for fossil fuels or as high-purity industrial pipe material. Furthermore, it can be used for power 9 and heat generation with coupled refrigeration due to the storability is possible. This technique deserves to be further investigated and to be brought up to its market potential.
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