NOVELTY - Organic slurry obtained by solid-liquid separation which separates organic substances into solid content and liquid, is decomposed in aerobic acid fermentation at 13-32 degreesC, and further subjected to acid reduced anaerobic fermentation, alkaline anaerobic fermentation and aging-sterilization, to obtain pollutant-free liquid fertilizer.    USE - For processing organic substance such as human waste, vegetable debris, plant residue, kitchen residue and animal waste, into pollutant-free liquid fertilizer.    ADVANTAGE - The method and apparatus effectively processes organic waste, and prevents global warming and environmental pollution. The method is safe. The method enables production of liquid fertilizer for cultivating crops, methane gas for use in fuel cell or gas engine, and the exhaust gas from the engine is used for heating green house and as carbon dioxide source.    DETAILED DESCRIPTION - Manufacture of pollutant-free liquid fertilizer involves decomposing organic slurry obtained by solid-liquid separation which separates organic substance into solid content and liquid, in aerobic acid fermentation at 13-32 degreesC and suppressing production of total amount of biogas. The processed slurry is further subjected to acid reduced anaerobic fermentation and the gas mixture containing methane, carbon dioxide and nitrogen formed is decomposed. The slurry is then decomposed by alkaline anaerobic fermentation under pressure and liquid fertilizer is processed from the produced gas. The pathogenic microbe and parasitic insect egg in the slurry are sterilized by aging-sterilization in a reservoir and temperature of slurry is maintained constant, to obtain pollutant-free liquid fertilizer.    An INDEPENDENT CLAIM is also included for liquid fertilizer processing apparatus, which has a reservoir (10) provided with aerobic slopping acid fermentation region (3), acidic reduced anaerobic fermentation region (4), alkaline anaerobic fermentation region (5) and aging-sterilization region (6).    DESCRIPTION OF DRAWING(S) - The figure shows longitudinal cross-sectional view of liquid fertilizer manufacturing apparatus. (Drawing includes non-English language text).    Aerobic acid fermentation region (3)    Anaerobic fermentation region (4)    Alkaline anaerobic fermentation region (5)    Aging-sterilization region (6)    Reservoir (10)