NOVELTY - The forward osmosis food waste concentration system comprises a digester stage comprising a digesting operation to produce a residual wastewater stream from food waste, a coarse filtering stage coupled to the digester stage and configured to receive a filtered residual wastewater stream, an acid treatment stage coupled to the coarse filtering stage to receive the filtered, residual wastewater stream, a forward osmosis stage coupled to the acid treatment stage to receive an acid treated, filtered, residual wastewater stream from the acid treatment stage, and a reverse osmosis stage.    USE - The forward osmosis food waste concentration system is useful for producing fertilizer and recycling water from an incoming food waste methane digester wastewater stream.    ADVANTAGE - The system is capable of simply, effectively and economically producing the high-value fertilizer and recycling water.    DETAILED DESCRIPTION - The forward osmosis food waste concentration system comprises a digester stage comprising a digesting operation to produce a residual wastewater stream from food waste, a coarse filtering stage coupled to the digester stage and configured to receive a filtered residual wastewater stream, an acid treatment stage coupled to the coarse filtering stage to receive the filtered, residual wastewater stream, a forward osmosis stage coupled to the acid treatment stage to receive an acid treated, filtered, residual wastewater stream from the acid treatment stage, and a reverse osmosis stage coupled to the forward osmosis stage to receive a diluted, saturated salt brine stream from the forward osmosis stage. The forward osmosis stage comprises a forward osmosis operation configured to: divert the acid treated, filtered, residual wastewater stream to one side of a forward osmosis membrane; and contact an opposite side of the forward osmosis membrane with a saturated salt brine stream in a forward osmosis draw loop and osmotically pull water across the forward osmosis membrane from the acid treated, filtered, residual wastewater stream to the saturated salt brine stream using only a concentration gradient for producing a fertilizer stream and the diluted, saturated salt brine stream. The coarse filtering stage comprises a screening operation to produce the filtered, residual wastewater stream. The acid treatment stage comprises a treatment operation to retain ammonium and produce the acid treated, filtered, residual wastewater stream. The reverse osmosis stage comprises a reverse osmosis operation to pump under pressure the diluted, saturated salt brine stream to a reverse osmosis membrane and to produce a re-concentrated saturated salt brine stream and a recycled purified water stream. The saturated salt brine stream comprises a saturated potassium chloride brine stream. The forward osmosis membranes: are a semipermeable membrane, a cellulosic membrane and a spiral wound membrane; and operated in a parallel flow configuration. An INDEPENDENT CLAIM is included for a process for producing fertilizer and recycling water from a food waste methane digester wastewater stream.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic block diagram of a forward osmosis food waste concentration system.