Deep biochemical treatment system for papermaking wastewater

The invention relates to the technical field of sewage treatment, in particular to a papermaking sewage deep biochemical treatment system which comprises a machine shell, a treatment cavity used for containing papermaking sewage is formed in the machine shell, a driving mechanism used for providing power is arranged at the upper end of the machine shell, and two sliding cavities are symmetrically formed in the inner top of the machine shell; a spraying mechanism which is matched with the driving mechanism and is used for spraying a flocculating agent into the treatment cavity is arranged in the sliding cavity on one side. According to the sewage treatment device, a flocculating agent in the storage tank can be pumped out and sprayed into the treatment cavity through the first spray head, so that flocculation of sewage is completed, the mixing degree of the flocculating agent and the sewage in the treatment cavity is improved, the sewage treatment efficiency is improved, the sewage in the treatment cavity is s