NOVELTY - Filler comprises an electric and porous materials as carrier, anaerobic digestion bacteria, denitrifying bacteria and anaerobic ammonia oxidation bacteria, where the bacterias are adhered to a surface of the carrier to form film, and low-redox potential anaerobic digestion bacteria constitutes biology cathode to constitute biology electrode couple.    USE - The filler is useful for treating sewage.    ADVANTAGE - The filler efficiently removes organic and nitrogen pollutants from sewage.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing the filler, comprising: (a) soaking and washing the carrier using deionized water, and adjusting a pH of the solution until the solution becomes neutral; (b) extracting sludge from an anaerobic digester in a sewage treatment plant, inoculating the sludge on culture medium comprising anaerobic digestion bacteria, extracting the sludge of the denitrifying pool in sewage treatment plant, inoculating sludge on the culture medium comprising denitrifying bacteria and anaerobic ammonia oxidation bacteria, controlling pH of culture solution to 6.5-7.5, removing organic pollutants and nitrogen pollutants when the concentration of bio-aerosols in culture solution is 3000-4000 mg/l, where the culture medium with anaerobic digestion bacteria comprises 30 mg/l of ammonium sulfate, 30 mg/l of monopotassium phosphate, 500 mg/l of potassium bicarbonate, 200 mg/l of magnesium sulfate, 100 mg/l of iron(III) chloride, 30 mg/l of calcium chloride, 500 mg/l of monosaccharide, 40 mg/l of sodium nitrate, and the culture medium with denitrifying bacteria and anaerobic ammonia oxidation bacteria comprises 60 mg/l of ammonium sulfate, 30 mg/l of monopotassium phosphate, 500 mg/l of potassium bicarbonate, 200 mg/l of magnesium sulfate, 100 mg/l of iron(III) chloride, 30 mg/l of calcium chloride, 200 mg/l of monosaccharide, 200 mg/l of sodium nitrate; adding 1-2 ml of microelement solution in the two culture mediums, where the microelement solution comprises 50 g/l of EDTA, 2.2 g/l of zinc sulfate, 5.5 g/l of calcium chloride, 5.06 g/l of manganese chloride tetrahydrate, 5 g/l of iron vitriol, 1.1 g/l of ammonium molybdate tetrahydrate, 1.57 g/l of blue copperas, 1.61 g/l of cobalt chloride hexahydrate; and (c) inoculating organism in the reactor containing carrier to make organism adhere to the carrier surface to form film, inoculating the domesticated and cultured suspension liquid containing the anaerobic digestion bacteria and suspension liquid containing the denitrifying bacteria and anaerobic ammonia oxidation bacteria in the reactor, and adding culture medium to make the inoculated organism to grow and adhere to the carrier surface to form film.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of filler.    Water inlet pipe (1)    Filler supporting plate (2)    Filler layer (3)    Filler pressure plate (4)    Gas collector. (5)