NOVELTY - A high temperature gas containing calcined lime and/or soft-burnt dolomite powder, water vapor, combustible gas and white fine powder, is added to a product containing a strong base, acid and organic refuse. Before adding gas, bacteria is bred and microorganism decomposition is accelerated. The fine powder is formed by thermal decomposition, deodorization, dehydration and volume reduction.    USE - For soil or ground improvement material and recovery material of contaminated oil (claimed).    ADVANTAGE - Processing of organic refuse is performed economically, in short period of time. Handling ability of the soil improvement material is improved. Packaging of products is performed easily. Incineration of snow-white color fine powder is eliminated, which prevents environmental pollution. Energy conservation is achieved during processing. Generation of gas containing dioxin is prevented at the time of thermal reaction.    DETAILED DESCRIPTION - A high temperature gas containing calcined lime and/or soft-burnt dolomite powder, water vapor, combustible gas and snow-white colored fine powder, is added to a product containing strong base, strong acid and organic refuse. Before adding gas, bacteria is bred and microorganism decomposition is accelerated. The fine powder is formed by thermal decomposition, deodorization, dehydration and volume reduction. A strong base and an organic refuse which does not contain chlorine are mixed and stirred, to obtain a fluid decomposition product. A strong acid which does not contain chlorine is mixed and stirred, followed by neutralization. Bacteria is cultured and microorganism decomposition is accelerated. A high temperature gas containing preset amount of calcined lime and/or soft-burnt dolomite powder, water vapor, combustible gas and snow-white colored fine powder, is added to the product. High temperature thermal reaction is performed. The fine powder is formed by thermal decomposition, heat dissolution, deodorization, sterilization, dehydration and volume reduction.    INDEPENDENT CLAIMS are also included for:    (1) soil or ground improvement material comprising a white fine powder obtained by processing organic refuse; and    (2) recovery material of contaminated oil. The material consists of a white fine powder obtained by mixing calcined lime and fluid decomposition product which accelerated microorganism decomposition.    DESCRIPTION OF DRAWING(S) - The figure shows the conceptual diagram of the garbage disposal apparatus for implementing processing of organic refuse.