NOVELTY - Method (M1) of obtaining a phosphate from a sewage material, comprises: (a) subjecting a wet sewage material to a hydrothermal carbonization process to produce a hydrochar and an aqueous product stream; (b) isolating the hydrochar from the aqueous product stream; (c) treating at least a portion of the isolated hydrochar with an aqueous acid under conditions to provide an aqueous phosphate material; and (d) isolating the acid-treated hydrochar from the aqueous phosphate material.    USE - The method is useful for obtaining: a phosphate and fatty acid materials from a sewage material; dewatered phosphate material which is useful as a fertilizer or as a component for use in applications comprising of foods, beverages, pharmaceuticals, personal care products, paints, cleaning products, ceramics and flame retardant materials; and untreated and/or treated hydrochar that is used directly as carbon-neutral energy products or indirectly as energy pro-products (all claimed), where the fatty acids are chemically transformed into useful products such as soaps, cosmetics and liquid transportation fuels such as biodiesel and conventional gasoline, diesel and aviation fuels, and hydrochars are combusted and the energy created is used to generate electricity.    ADVANTAGE - The method provides: aqueous phosphate material which is utilized as a fertilizer or as a feedstock for anaerobic digestion without further processing; dewatered phosphate material suitable for use with or without further processing; and the aqueous product stream suitable for use as a fertilizer or an anaerobic digestion substrate without further processing (claimed).    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method (M2) of obtaining fatty acid materials from a sewage material, comprising: step (a) and (b) as above per se; treating at least a portion of the isolated hydrochar with an organic solvent under conditions to extract the fatty acid materials into the organic solvent; and isolating the organic solvent-treated hydrochar from the organic solvent having the fatty acid materials in it.