Nitrification and denitrification combined integral biological filter

The invention provides a nitrification and denitrification combined integral biological filter, and belongs to the technical field of environmental engineering sewage. The filter comprises an aerobic treatment unit on the upper part of the filter, an anaerobic treatment unit in the middle of the filter, a water and gas distribution treatment unit at the bottom of the filter, and a filter plate which is used for partitioning the anaerobic treatment unit and the water and gas distribution treatment unit. By improving the structure form of the traditional two-stage nitrogen removal aeration biological filter, nitrification and denitrification nitrogen removal is realized in a single-stage filter, a treatment process flow is simplified, the complexity of a biological filter structure is not increased, infrastructure cost and operation cost are reduced, and the biological nitrogen removal performance of a system is improved.