TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The high biomass concentration suspended growth system comprises a five-stage sequence of anaerobic, anoxic, aerobic, anoxic, and aerobic zones operating with a biomass recycle pattern from the anoxic to aerobic zone, from aerobic to anoxic zone, and from aerobic to anoxic zone, with biomass wastage from aerobic zone.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The organic slurry is an animal manure slurry, or wastewater that comprises a low concentration of solids suspended in the liquid and that is used as the slurry stream. It comprises a high concentration of solids suspended in the liquid.    TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: When the deflocced stream is not readily biodegradable, the process includes treating the deflocced stream with hydrolyzing and acidogenic anaerobic bacteria in a fluidized bed reactor to hydrolyze a portion of volatile solids and acidify a portion of dissolved organic matter into volatile fatty acids, to form a hydrolyzed acidified deflocced stream, before feeding to the high biomass concentration suspended growth system. The process further comprises heating the deflocced stream to a mesophilic temperature before treating the deflocced stream in the fluidized bed reactor; passing the low-turbidity permeate through an ultraviolet radiation chamber for disinfection; and separating the organic slurry into a solids fraction comprising a majority of the solids and a liquids fraction comprising a minority of the solids suspended in the liquid. The liquids fraction is used as the slurry stream. The deflocced stream is heated by passing it through indirect heat exchange. A portion of the phosphorus that is not removed biologically is removed chemically and physically with the addition of alum, ferric chloride or polyaluminum chloride into the anoxic zone, to produce phosphate salts that precipitate into microfloes retained by the microfiltration membranes filtering out of aerobic zone. The slurry stream is flocculated in a flocculator with addition of anionic polymer and alum as coagulant. The floes are removed from the flocculated stream by passing the flocculated stream through a dissolved air floatation thickener with introduction of fine air bubbles. The organic slurry is separated with a centrifugal decanter. The solids fraction in the form of a cake is heat-dried and pelletized to produce an organo-mineral fertilizer for agricultural and horticultural applications. The floes are removed from the flocculated stream by passing the flocculated stream through a dissolved air flotation thickener. Water vapor produced in the heat-drying system is condensed in an indirect heat exchanger. The heat of condensation is recovered to warm the deflocced stream as it exits the dissolved air flotation thickener. Hot condensate produced in the heat-drying system is subjected to air stripping at high pH with added caustic to remove ammonium-nitrogen. The ammonia-laden air is subjected to wet acid scrubbing at low pH with added sulfuric acid or phosphoric acid to recuperate ammonia in the form of a concentrated solution of ammonium sulfate or ammonium phosphate. The ammonium sulfate or ammonium phosphate is added into the pelletizer to increase the nitrogen and/or phosphorus content of the fertilizer pellet.