NOVELTY - Growing biomass while simultaneously reducing the quantity of nitrates and carbon dioxide comprises delivering wastewater containing elevated levels of nitrates from a sewage treatment facility to an entry location of a biomass growth unit (22); delivering carbon dioxide derived from exhaust gas of a power generation plant (12) to the biomass growth unit; and photosynthetically growing a biomass from the nitrates and the carbon dioxide as the delivered nitrates and carbon dioxide are consumed and converted into other compounds.    USE - Method for growing biomass while simultaneously reducing the quantity of nitrates and carbon dioxide (claimed).    ADVANTAGE - The method simultaneously addresses the reduction of nitrates in the discharge of sewage treatment plants, the reduction of carbon dioxide emissions from the combustion processes used to generate power, and the production of fuel to meet growing energy demands. Two waste products, nitrate-rich sewage wastewater and power plant carbon dioxide emissions, are combined and converted into a renewable biomass energy source, which supplies the fuel to the power plant.    DETAILED DESCRIPTION - Growing biomass while simultaneously reducing the quantity of nitrates and carbon dioxide that would otherwise be available for discharge into the environment comprises    (A) delivering wastewater containing elevated levels of nitrates from a sewage treatment facility to an entry location of a biomass growth unit (22);    (B) delivering carbon dioxide derived from exhaust gas of a power generation plant (12) to the biomass growth unit;    (C) providing a feedstock of biomass to the wastewater at the entry location of the biomass growth unit;    (D) photosynthetically growing a biomass from the nitrates and the carbon dioxide as the delivered nitrates and carbon dioxide are consumed and converted into other compounds; and    (E) harvesting the grown biomass.    An INDEPENDENT CLAIM is included for a system for growing biomass while simultaneously reducing the quantity of nitrates and carbon dioxide comprising a sewage treatment facility that generates wastewater containing elevated levels of nitrates; a biomass growth unit exposed to sunlight and having an infeed end and a discharge end; a wastewater delivery path from the sewage treatment facility to the biomass growth unit; a power generating plant having a fuel combustion unit that emits an exhaust containing carbon dioxide gas; a gas delivery path from the power generating plant to the biomass growth unit, where carbon dioxide from the exhaust gas is introduced into the wastewater in the biomass growth unit; a source of feed stock of the biomass; a feedstock delivery path into the wastewater at the infeed end of the biomass growth unit; and a biomass harvester at the discharge end of the biomass growth unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an integrated power plant, sewage treatment and aquatic biomass fuel production system situated adjacent a river.    Power generation plant (12)    Biomass growth unit (22)    Body of water (30)    Sewage separator (38)    Conversion unit (50)    Auxiliary clean-up (56)