Totally-enclosed aerated grit chamber

The utility model belongs to the technical field of sewage treatment equipment, and relates to a totally-enclosed aerated grit chamber which comprises at least one grit hopper, a totally-enclosed chamber top is constructed at the top of the grit hopper, a water inlet channel is constructed at one end of the grit hopper, and a water outlet channel is constructed at the other end of the grit hopper; supporting columns which extend in the length direction and protrude out of the upper surface of the pool top are arranged on the pool top so as to support the bridge type sand sucker and reserve a space for the deodorization header pipe; a sand suction pipe moving groove is formed in the top of the pool, during working, a sand suction pipe of the bridge type sand suction machine penetrates through the sand suction pipe moving groove and then extends into the bottom of the sand settling hopper, and sliding films are arranged on the two sides of an opening of the sand suction pipe moving groove respectively so as to