NOVELTY - A system for the production of synthetic fuel, comprises: a catalytic dual fluidized bed (DFB) configured to produce, from a DFB feedgas, a DFB product comprising synthesis gas; and a Fischer-Tropsch (FT) synthesis apparatus fluidly connected with the catalytic DFB, where the FT synthesis apparatus comprises: an FT synthesis reactor configured to produce, from an FT feedgas, an FT overhead and a liquid FT product comprising FT wax; and a product separator configured to separate, from the FT overhead, a FT tailgas and a light Fischer-Tropsch liquids (LFTL) product comprising LFTL.    USE - For the production of synthetic fuel (claimed).    ADVANTAGE - The system and method provide higher yields of synthesis gas via conversion of carbonaceous material(s), enable production of synthesis gas and subsequently of synthetic fuels from low value fuel gas, provide increased overall yields of synthetic fuels via conversion of synthesis gas, reduce or eliminate the need for extensive downstream cleaning of synthesis gas prior to downstream FT synthesis, allow production of synthesis gas in the absence of costly air separation unit(s), and reduce and/or eliminate potential byproduct soot formation relative to conventional systems and methods.    DETAILED DESCRIPTION - A system for the production of synthetic fuel, comprises: a catalytic dual fluidized bed (DFB) configured to produce, from a DFB feedgas, a DFB product comprising synthesis gas; and a Fischer-Tropsch (FT) synthesis apparatus fluidly connected with the catalytic DFB, where the FT synthesis apparatus comprises: an FT synthesis reactor configured to produce, from an FT feedgas, an FT overhead and a liquid FT product comprising FT wax, where the FT feedgas comprises at least a portion of the DFB product; and a product separator downstream of and fluidly connected with the FT synthesis reactor, where the product separator is configured to separate, from the FT overhead, a FT tailgas and a light Fischer-Tropsch liquids (LFTL) product comprising LFTL. An INDEPENDENT CLAIM is included for a method (M1) of producing synthetic fuel, involving: producing a dual fluidized bed (DFB) product from a DFB feedgas, via a catalytic DFB, where the DFB product comprises synthesis gas; introducing an FT feedgas comprising at least a portion of the DFB product into an FT synthesis reactor; extracting a gaseous FT overhead and a liquid FT product comprising FT wax from the FT synthesis reactor; separating, from the FT overhead, an FT tailgas and an LFTL product comprising LFTL; and upgrading at least a portion of the LFTL product and/or at least a portion of the liquid FT product, thus providing at least one synthetic fuel.