NOVELTY - Treatment of organic waste involves biologically treating the waste in a micro-electron acceptor (MEA) environment, where oxygen is added to maintain less than 2 mg/l of dissolved oxygen throughout the MEA environment. The waste is simultaneously nitrified and denitrified in the environment. The increased conversion of at least one nutrient from soluble to particulate form is induced in the environment by micro-electron acceptor phosphorus accumulating organisms (MEAPAOs).    USE - For treating organic waste to produce odorless beneficial organic humus material (claimed); for treating solid and liquid organic wastes, particularly animal farm wastes for removing nutrients e.g. phosphorus and nitrogen from waste; for treating municipal wastewater streams and for producing microbial cell protein of microbial cell mass for single cell protein production from biodegradable materials e.g. solid and/or water borne, and nitrogen source.    ADVANTAGE - The process is operated at low electron acceptor concentrations while maintaining high quantities of diverse populations of microorganisms. The process solves many of the problems associated with municipal, domestic, industrial, food industry, animal husbandry and other organic wastes, by providing an attractive and efficient way to resolve ecological problems associated with the treatment of organic wastes. The process solves odor emission problem common to organic wastes as well as the problem associated with high nutrient effluent discharge concentrations through the efficient, odorless, biologically mediated conversion of waste excrement materials or a vast array of other organic wastes into stable, economically and/or ecologically beneficial materials. The process biologically treats and stabilizes organic waste, such as animal excrement, containing concentrations of potentially polluting or environmentally harmful substrates. The process performs simultaneous nitrification and denitrification on organic waste streams and converts soluble phosphorus to particulate form. The process produces humus material having commercial value, does not having unpleasant odor, and can be safely maintained in open storage without significant migration of compounds. The process also manages water, which can be combined with organic waste to provide a nutrient rich aqueous fertilizer, which can be used to irrigate crops, or as a clean, generally low nutrient liquid, that with further processing is potentially suitable for discharge to a water body. The process treats an influent waste stream containing phosphorus/nitrogen ratios higher than 0.17 (preferably greater than or equal to 0.30 - 0.50) and still have effluent discharges with low quantities of phosphorus. The process converts approximately greater than or equal to 50% of the influent waste stream soluble phosphorus into particulate form, incorporated into the humus material, and removed when that humus material is harvested. The process maintains a sufficient quantity of mutations, thus providing for an efficient, dynamic biologically mediated conversion process. The process allows the microbial community to adapt in a workable period to achieve a dynamic equilibrium. The organic and nitrogen loading allows an energy, carbon and nitrogen balance to occur between the microbial populations of facultative heterotrophic fermentors, autotrophic nitrifiers, facultative heterotrophic denitrifiers and autotrophic ammonium denitrifiers. The control of dissolved oxygen levels and/or oxygen additions creates and maintains the populations of facultative heterotrophic fermentors, autotrophic nitrifiers, facultative heterotrophic denitrifiers and autotrophic ammonium denitrifiers.    DETAILED DESCRIPTION - Treatment of organic waste involves biologically treating the waste in a micro-electron acceptor (MEA) environment, where oxygen is added to maintain less than 2 mg/l of dissolved oxygen throughout the MEA environment. The waste is simultaneously nitrified and denitrified in the environment. The increased conversion of at least one nutrient from soluble to particulate form is induced in the environment by micro-electron acceptor phosphorus accumulating organisms (MEAPAOs). The method further involves addition of chemicals to provide an energy source for the denitrification of nitrite or nitrate by facultative heterotrophic denitrifiers. INDEPENDENT CLAIMS are included for the following:    (1) creating microorganisms adapted to grow in a low electron acceptor environment and without a physically separated anaerobic environment involving biologically treating waste in MEA environment;    (2) an odorless beneficial organic humus material that are harvested from the odorless, biologically mediated treatment process;    (3) a system for biologically mediated treatment of organic wastes comprising unit for directing waste to a temporary anaerobic unit; and unit for directing the temporary anaerobic unit effluent stream to a microorganism growth managing and enhancer unit having MEA environment and a biomass having a population of MEAPAOs;    (4) a population of MEAPAOs adapted to grow in MEA environment without a physically separated and defined anaerobic environment, where MEAPAOs are capable of increased conversion of nutrient from soluble to particulate form the MEA environment; and    (5) a population of micro-organisms comprising MEAPAOs that are capable of increased conversion of nutrient from soluble to particulate form in a micro-electron acceptor environment without a physically separated and defined anaerobic environment.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic of the predominant interrelationships of the organic waste, the major microbial groups responsible for biologically mediated conversion, the intermediate breakdown substances, and the final products of the process.