TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The inventive method further comprises the step of controlling a first flowrate through the algal growth channel and a second flowrate through the raceway.The first portion of the algal laden water from the algal growth channel is fed to raceways, each of the raceways containing an aquatic organism.The first and second aquatic organisms are periodically harvested.The collected algal biomass is collected into a digester and a hydrocarbon gas is produced.A fertilizer composition from the digester is collected.Fermentation takes place within the digester.The algal biomass is continuously removed from the raceway and the polishing chamber by a porous conveyor.Preferred Condition: The digester is heated to 30-40 degrees C. The flowrate of the algal growth channel is 0.1-0.3 ft/second.Preferred Component: The first and second aquatic organisms comprise fish, such as tilapia or filter feeding fish.Preferred Composition: The second aquatic organism consumes at least 90% of the algae contained in the water fed to the polishing chamber. Over a 24-hour period, the wastewater flowing into the algal growth channel is approximately equal to the water being discharged by the polishing chamber.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The water discharged to the external water source from the polishing chamber contains less than 5 mg/L of organic matter. The hydrocarbon gas comprises methane.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The water discharged to the external water source from the polishing chamber contains less than 0.5 mg/L phosphorus. The fertilizer composition comprises at least 80% ammonia and at least 30% soluble phosphorus compounds.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The polishing chamber comprises a first containment section (32) and a second containment section (34), each of the containment sections containing the second aquatic species, and water is alternately discharged from the first containment section and the second containment section such that the polishing chamber operates as a sequencing batch reactor. A common channel (20) is provided in communication with the algal growth channel, the raceway, and the polishing chamber, where water from the algal growth channel flows into the common channel and then into the raceway or the polishing chamber. The biomass removal device comprises a porous conveyor (36) positioned in the raceway.    TECHNOLOGY FOCUS - TEXTILES AND PAPER - Preferred Component: The algal biomass is combined with a cellulose source (20-60 wt.%) from paper in the digester.