NOVELTY - A waste percolation liquid is subjected to hydrolyzation-acidification process, denitrification and anaerobic methanogenic reaction. The yielding water of up-flow anaerobic sludge blanket reactors is supplied into a micro-aeration bacteria filter reactor. The yielding water is circulated into the up-flow anaerobic sludge blanket reactor (I). The non-biochemical organic material and soluble microbes are supplied into a coagulation drain trap. The deposited yielding water is subjected to filtration process using a nano-filter membrane.    USE - Anaerobic-aerobic-film process used for processing waste percolation liquid.    ADVANTAGE - The method enables efficient processing of waste percolation liquid.    DETAILED DESCRIPTION - A waste percolation liquid is subjected to hydrolyzation-acidification process and denitrification in an up-flow anaerobic sludge blanket reactor (I) to remove nitrogen oxide and a portion of organic material. The waste percolation liquid is subjected to anaerobic methanogenic reaction to remove organic material, and the generated methane is recycled. The processed percolation liquid has chemical oxygen demand of 80-90% and concentration of nitrogen oxide of 20 mg/L or less. The yielding water of up-flow anaerobic sludge blanket reactors is supplied into a micro-aeration bacteria filter reactor for nitration to remove ammonium nitride, a portion of total nitrogen and remaining organic material. The yielding water is circulated into the up-flow anaerobic sludge blanket reactor (I). The circulation ratio of yielding water is calculated with respect to actual water quantity required to remove the remaining nitrogen oxide which is produced in the micro-aeration bacteria filter section. The biochemical organic material and ammonium nitride are removed by anaerobic and aerobic treatment. The non-biochemical organic material and soluble microbes are supplied into a coagulation drain trap to remove sulfur and organic material (50-60%). The yielding water is subjected to filtration process using a nano-filter membrane to remove remaining organic material and ammonium nitride, and the discharged water has sewage discharging level (a). The condensation liquid is recycled to the up-flow anaerobic sludge blanket reactor (I).