NOVELTY - A solid-chemical composition comprises (wt.%): a solid-chemical source of active oxygen (57 - 95) selected from at least one calcium peroxide and magnesium peroxide; sodium hexametaphosphate (0.25 - 25) is a complex inorganic phosphate; sodium trimetaphosphate (0.25 - 25) is a complex inorganic phosphate; pre-gelled starch (0.1 - 4) is an organic disintegrant; and magnesium stearate (0.05 - 1) is a lubricant.    USE - For the non-exothermic chemical oxidation and aerobic and fungal biodegradation of organic compounds and certain inorganic contaminants present in solid and liquid wastes, sludges, leachates, acid-mine drainages, waste waters, soils, sediments, ground waters, surface waters and other environmental media; for removing environmental contaminants including petroleum hydrocarbons and low molecular weight halogenated organic compounds, from industrial wastes, soils, sediments, sludges, ground waters, surface waters; and for treating organic contaminants (e.g. undesirable microorganisms and microbial pathogens of beneficial plants, animals and fungi, pesticides, polycyclic aromatic hydrocarbons, coal tar, crude oil, lubricating oils, motor oils, hydraulic oils, grease, diesel fuel, jet fuel (aviation gasoline), kerosene, paraffin, gasoline, aromatic solvents, mineral spirits, methyl tertiary butyl ether, tertiary butyl alcohol, formaldehyde, acetone, and inorganic contaminants such as the acids and metals present in acid-mine drainage.    ADVANTAGE - The composition provides a sustained release of active oxygen and complex inorganic phosphates; creates, enhances, and maintains oxidizing and aerobic conditions (i.e. high dissolved oxygen concentrations) which favor non-exothermic, chemical-oxidation processes and aerobic bioremediation and fungal bioremediation processes; stimulates fungal biodegradation processes; provides a source of co-substrates and nutrients to promote the growth of contaminant-degrading microorganisms, and provide sources of inoculum of beneficial microorganisms which act to promote the biodegradation of contaminants; enhances the removal of a broad range of environmental contaminants e.g. petroleum hydrocarbons and low molecular weight halogenated organic compounds; promotes the chemical oxidation and aerobic, biologically mediated degradation, transformation, and/or detoxification of a broad range of organic contaminants in the environment including petroleum products such as gasoline, diesel fuel, fuel oils, and lubricating oils and halogenated organic solvents such as perchloroethylene, trichloroethylene, trichloroethane and freon; provides the combined benefits of relatively long-term, low-temperature chemical-oxidation processes, (akin to a gentler or less-aggressive Fenton reaction), as well as enhances aerobic biological processes which work together to promote the biodegradation, transformation, and/or detoxification of the aforementioned environmental contaminant; promotes the non-exothermic chemical oxidation and aerobic biodegradation, transformation, and/or detoxification of organic compounds and certain inorganic contaminants which are present in e.g. solid and liquid wastes, sludges, leachates, acid-mine drainages, waste waters. The composition is prepared and used in the forms of e.g. granules, briquettes, tablets, thus easy to handle and apply under typical field conditions. The composition is relatively rapid and cost-effective for both the non-exothermic chemical-oxidation and the aerobic bioremediation of chemical contaminants which convert these contaminants into non-hazardous mineral forms and/or less hazardous by-products.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a solid-chemical composition prepared in the form of granules, briquettes, tablets, capsules and/or pellets, which provides a sustained-release of active oxygen and complex inorganic phosphates.