NOVELTY - Treating mixed organic waste involves mixing supply of waste having a first average moisture level before treatment with supply of other solid waste having lower average moisture level before treatment, where relative quantities of waste and other waste are controlled; feeding waste into treatment vessel; and treating waste by microbial activity, where waste is agitated during treatment, oxygen content in gas in contact with waste is controlled so that it is not below 5 vol.%, where waste has average moisture level after treatment of not greater than 45 (preferably not greater than 35, especially not greater than 25) wt.%.    USE - For treating solid mixed organic waste and processing to form fuel and compost (claimed) for horticultural purposes; and for processing mixed collected municipal waste or agricultural waste. The waste also includes mixed domestic waste, industrial waste or agricultural waste.    ADVANTAGE - The method allows processing of municipal waste having variable moisture level and physical composition so as to achieve a relatively homogeneous product. The method allows recycling of municipal and agricultural waste to produce either fuel material for replacement of fossil fuels or organic compost for horticultural purposes. The method allows 75-85 wt.% of delivered domestic waste to be recycled. The method allows formation of product which is suitable for subsequent storage, transportation and sale. The method provides a fuel such as Green Coal having calorific value in order of 14500 kJ/kg; having an ash content of less than 20 wt.% and having relatively low levels of sulfur and chlorine thereby reducing pollution due to acid rain from gases of combustion. The method allows formation of compost having relatively high nutrient level.    DETAILED DESCRIPTION - Treating mixed organic waste involves mixing a supply of organic waste having a first average moisture level before treatment with a supply of other solid waste having a lower average moisture level before treatment, where the relative quantities by weight of the organic waste and the other waste are controlled; feeding the mixed solid waste into a treatment vessel; and treating the waste by microbial activity in the treatment vessel, where the mixed solid waste is agitated during treatment, where the oxygen content in the gas in contact with the mixed solid waste is controlled during the treatment process so that it is not below 5 vol.%, where the waste has an average moisture level after treatment of not greater than 45 (preferably not greater than 35, especially not greater than 25) wt.%; or treating the waste by microbial activity under conditions in which the oxygen level in the gas in contact with the waste is not below 5 vol.%; and subsequently treating the treated waste in a pyrolysis process. INDEPENDENT CLAIMS are included for the following:    (1) an apparatus (A1) for treating solid mixed organic waste comprising: a supply for organic waste having a first average moisture level before treatment and a supply for other waste having a lower average moisture level before treatment; units for mixing the organic waste and the other waste before they are fed into a treatment vessel; control units for controlling the relative quantities by weight of the organic waste and other waste mixed together; units for feeding the organic waste and the other solid waste into a treatment vessel; units for agitating the mixed solid waste in the treatment vessel; drying units following the treatment vessel; and units for controlling the air flow through the treatment vessel and/or the input of organic waste and the other solid waste to the treatment vessel, so that the average moisture level of waste after treatment is not greater than 45 (preferably not greater than 35, especially not greater than 25) wt.% and so that the oxygen content of gas in contact with the mixed solid waste in the vessel is not below 5 vol.%; and    (2) apparatus (A2) for treating mixed organic waste comprising a microbial treatment vessel; unit for feeding microbially treated mixed organic waste from the treatment vessel to unit for pyrolyzing the treated mixed organic waste, where the aerobic microbial treatment vessel is controlled so that the oxygen content in the gas in contact with the waste during treatment is not below 5 vol.%.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of process showing the steps involved in feeding the rotary aerobic digester and drying the material.    Blender or mixer (115)    Aerobic digester (116)    Loading end (117)    Unloading end (118)    Stockpile/drying floor (123)    Fan (148)    Oxygen sensor (149)    Moisture sensor (150)    Controller (151)