Method for synchronously removing high-concentration ammonia nitrogen, iron and manganese in water through reverse flow oxygenation multi-stage catalytic oxidation

The invention discloses a method for synchronously removing high-concentration ammonia nitrogen, iron and manganese in water through efficient catalytic oxidation. The method adopts a system consisting of a catalytic oxidation filtration system, a reverse flow oxygenation system and a back washing system, the trace oxygenation is implemented at the medium-lower part of catalytic oxidation filtering layers to guarantee that each filtering layer contains sufficient dissolved oxygen, and the catalytic oxidation capabilities of all the filtering layers are given into full play, so that the high-concentration ammonia nitrogen, iron and manganese in water are synchronously removed through catalytic oxidation; and besides, the bottom filtering layer gives full play of the function of guaranteeing filtering. The method has the advantages that the removal efficiency is high, the impact-resistant load is high, the project investment is less, the running cost is low, and the implementation difficulty is small. The method is suitable for the new construction and upgrading transformation of both surface water treatment plants and underground water treatment plants.