Tubular denitrification biological filtration reactor

The utility model discloses a tubular denitrification biological filtration reactor, and belongs to the technical field of filtration equipment. In order to solve the problem that filter elements and shells of direct filtering units in existing products are inconvenient to assemble and disassemble, the following technical scheme is provided, the direct filtering device comprises a plurality of direct filtering units and a pipeline module used for being connected with the direct filtering units, each direct filtering unit is composed of a shell, an end flange, a base, a filter element, a top cover and a clamping mechanism, the end flange is fixedly connected to the outer wall of the bottom of the shell, the clamping mechanism is arranged on the top of the shell, the base is located below the end flange, and the end flange is connected with the base through a flange. Flange connection between the shell and the filter element is replaced by the clamping mechanism for locking and fixing, so that when the filter e