NOVELTY - Removal of nitrogen and phosphorus in municipal sewage comprises adding municipal sewage to bioreactor with microorganism-loaded magnetic seed and/or magnetic Zoogloea, and carrying out biological reaction; sending mixed liquid to magnetic separator; introducing liquid into rare earth disk separator and making separated magnetic active sludge reflux to the bioreactor; and adding coagulant to separated liquid before it enters to separator and mixing with water power; making mixed liquid enter the separator; and removing solid suspending substance and phosphorus in liquid.    USE - Method for removing nitrogen and phosphorus in municipal sewage.    ADVANTAGE - Because the method adopts the process combined with biological reaction and dosing magnetic separation, the investment and operation cost are lower than those of membrane bioreactor. The method has high separation efficiency, low energy consumption, good removing effect of nitrogen, phosphorus, suspended solids, chemical oxygen demand, biochemical oxygen demand, and small floor area, so it is suitable for treating municipal sewage with large flow and high concentration and enlarging treatment capacity for current urban sewage treatment plant.    DETAILED DESCRIPTION - Removal of nitrogen and phosphorus in municipal sewage comprises: (A) adding municipal sewage to bioreactor with microorganism-loaded magnetic seed and/or magnetic Zoogloea, regulating pH to 6-9, and carrying out biological reaction for 15-48 hours under conditions that the aeration oxygen-dissolving amount is 0.5-2 mg/l and temperature is 15-35 degrees C; (B) sending the mixed liquid to magnetic separator at 0.1-0.5 m/s to carry out separation; introducing the liquid into the rare earth disk separator to carry out separation; and making separated magnetic active sludge reflux to the bioreactor; and (C) adding coagulant to the separated liquid before the liquid enters to the rare earth disk separator, mixing with water power produced by liquid itself in the delivery pipe; making the mixed liquid enter the rare earth disk separator to separate; and removing solid suspending substance and phosphorus in liquid, and discharging the water as standard discharge water.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic flow diagram of a method for removing nitrogen and phosphorus in municipal sewage (Drawing includes non-English language text).