NOVELTY - Method for removing fats and oils in kitchen waste using calcium stearate, involves collecting food waste, pulverizing the waste, acidifying the pulverized mixture using pre-acidification reactor, determining e.g. total solids content in the mixture, maintaining concentration of calcium ion content in the acidified mixture, discharging the stirred material from the pre-acidification reactor, maintaining hydraulic retention time of the acidified phase reactor, pumping the discharged acidified material to methanation reactor, and separating calcium stearate.    USE - The method is useful for removing fats and oils in kitchen waste by using calcium stearate generated through phase-split anaerobic hydrolysis.    ADVANTAGE - The method produces calcium stearate in large yield, removes fats and oil easily, and utilizes by-products such as feed liquid as biogas slurry, and biogas residue as fertilizer.    DETAILED DESCRIPTION - Method for removing fats and oils in kitchen waste using calcium stearate generated through phase-split anaerobic hydrolysis, involves (a) collecting food waste from school cafeteria, canteens, hotel and restaurants, mechanically sorting the food waste, separating bones and other items from the food waste, packaging the food waste in plastic bags, pulverizing the remaining waste, acidifying the pulverized mixture using pre-acidification reactor at room temperature for 2-3 days, controlling and regulating raw material parameter, stirring the acidified mixture, and determining total solids content, total volatile solids content, chemical oxygen demand, soluble chemical oxygen demand, and volatile fatty acids in the mixture, (b) maintaining concentration of calcium ion content in the acidified mixture to 2.5-4% and fat content to 20-30%, where the pre-acidification reactor is operated and controlled by (i) adjusting load to 30-50 gVS/L.d, adding food waste and anaerobic volatile solids in ratio of 2-3:1, maintaining dissolved oxygen level to 0.1-0.3 mg/L to maintain anaerobic condition, performing acidification process at 32-38 degrees C for 5-7 days and collecting the acidified sludge, and (ii) pumping 10-12 gVS/L.d to the acidified phase reactor, monitoring the calcium ion content in the acidified mixture, adding lipase to the mixture in the ratio of 14-15:1 with respect to changes in the calcium ion concentration, determining amount of fat and oil removal to 60-70%, adding supplement containing fatty acid and stearic acid in the ratio of 14-15:1, controlling the reaction at 32-38 degrees C, stirring the reaction for 8-12 times/day for 5-10 minutes and controlling pH of the reaction at 4-6, (c) discharging the stirred material from the pre-acidification reactor, collecting the discharged material in storage pool, and maintaining hydraulic retention time of the acidified phase reactor for 6-8 days, and (d) pumping the discharged acidified material to methanation reactor, loading 4.5 gVS/L.d of load, maintaining hydraulic retention time for 20-30 days, controlling the methanation reactor at 32-38 degrees C, stirring the mixture for 8-12 times/day for 5-10 minutes at pH 6.8-7.2, determining the methane content in the stirred mixture, separating calcium stearate particles and feed liquid by solid-liquid separation, separating calcium stearate, and washing the obtained calcium stearate.