cost was assumed to be zero, as it is expected that this cost will be recovered after a few unit sales. The system consists of a mixing/holding tank for the raw manure, digestion tanks with piping, fluid handling equipment, a gen-set with instrumentation, associated equipment buildings and an activated carbon column. Two different digestion modules would be available, which could be used in any combination. The smaller module would have an 11 m3 digestion capacity, while the larger module would have a 34 m3 digestion capacity, and both modules would operate in an upflow anaerobic sludge blanket (UASB) configuration. Gas cleaning with activated carbon was employed to allow for the use of “off-the-shelf” gen-sets in order to reduce overall cost.