NOVELTY - A system (10) for producing fuel from gas stream of biogenic origin comprises gas inlet (14), hydrogen sulfide removal stage (18), filtration stage (34) configured to remove particulates and free moisture entrained in gas stream, primary compression stage (46), moisture removal stage (70) configured to condense and separate remaining moisture from gas stream, siloxane removal stage (94) to receive second media which removes some siloxanes from gas stream; carbon dioxide removal stage (114) to separate carbon dioxide; and secondary compression stage to elevate pressure of gas stream.    USE - As system for producing fuel from a gas stream of biogenic origin (claimed), used in compressed natural gas (CNG) vehicles such as cars, trucks; or gas for use in an electrical generator-set; or gas for direct use in a boiler or furnace.    ADVANTAGE - The system is configured such that a generator set and/or a direct use component can be fueled directly by un-blended permeate gas from the permeate discharge line. The configuration of system maximizes the flow rate of gas available for the production of fuel for use as a compressed natural gas (CNG) substitute, while recovering energy from the permeate gas for other uses. The hydrogen sulfide removal stage only requires where the feed gas contains appreciable quantities of hydrogen sulfide gas.    DETAILED DESCRIPTION - A system (10) for producing fuel from a gas stream of biogenic origin, comprises gas inlet (14) configured to convey a gas stream from a feed source to the system, a hydrogen sulfide removal stage (18) operably connected downstream of the gas inlet, where the hydrogen sulfide removal stage includes a first vessel (22) configured to receive a first media that removes hydrogen sulfide entrained in a gas stream, a filtration stage (34) operably connected downstream of the gas inlet and configured to remove particulates and free moisture entrained in the gas stream; a primary compression stage (46) operably connected downstream of the gas inlet and configured to elevate a pressure of the gas stream, where the primary compression stage comprises a sealed scroll compressor (50); a moisture removal stage (70) operably connected downstream of the gas inlet and configured to condense and separate remaining moisture from the gas stream, siloxane removal stage (94) operably connected downstream of the gas inlet, where the siloxane removal stage includes a second vessel configured to receive a second media which removes at least some siloxanes from the gas stream, a carbon dioxide removal stage (114) operably connected downstream of the gas inlet and including a single-stage membrane configured to separate carbon dioxide from the gas stream by a permeability characteristic of the gas stream; and a secondary compression stage operably connected downstream of the primary compression stage and configured to elevate a pressure of the gas stream to a level for distribution to compressed natural gas (CNG)-compatible vehicles. An INDEPENDENT CLAIM is included for producing fuel and electricity from a gas stream of biogenic origin, involving providing a gas stream of biogenic origin; reducing a hydrogen sulfide content of the gas stream by passing the gas stream through a first media adapted to remove at least some hydrogen sulfide in the gas; reducing a quantity of particulates and free moisture entrained in the gas stream by passing the gas stream through a filtration stage; compressing the gas stream within a primary compression stage comprising a sealed scroll compressor; reducing a moisture content of the gas stream by passing the gas through a moisture removal stage configured to condense and separate remaining moisture from the gas stream; reducing a siloxane content of the gas stream by passing the gas stream through a second media adapted to remove at least some siloxanes from the gas stream; selectively directing the gas stream for at least one of fuel production, electrical generation, and direct use; and reducing a carbon dioxide content of the gas stream by separating carbon dioxide from the gas stream with a single-stage permeable membrane.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the integrated fuel production system.    System (10)    Gas inlet (14)    Hydrogen sulfide removal stage (18)    Hydrogen sulfide removal vessel (22)    Filtration stage (34)    Primary compression stage (46)    Sealed scroll compressor (50)    Moisture removal stage (70)    Siloxane removal stage (94)    Carbon dioxide removal stage (114)