The utility model discloses a multistage
precipitation and dephosphorization integrated device for
sewage treatment, and belongs to the technical field of
sewage treatment. The technical scheme adopted by the utility model is as follows: the multi-stage
sedimentation and dephosphorization integrated device for
sewage treatment comprises a pretreatment tank, an
anaerobic treatment tank, an anoxic treatment tank and an aerobic treatment tank which are communicated in sequence, wherein a third guide
pipe is connected between the anoxic treatment tank and the aerobic treatment tank, and the third guide
pipe is connected to the middle lower part of the aerobic treatment tank from the middle upper part of the anoxic treatment tank; through the pretreatment tank, the
anaerobic treatment tank, the anoxic treatment tank and the aerobic treatment tank which are sequentially communicated, and by combining the change of the cross section of the connecting
pipe and the optimization of the position of the air inlet pipe, efficient
aeration and gas-liquid mixing are realized, the use of
chemical agents is reduced, the
phosphorus recovery rate is improved, and meanwhile, the occupied area and the
sludge treatment cost are reduced by the integrated structure; the device has the advantages that the treatment efficiency is improved, the
energy consumption is reduced, the dependence on
chemical agents is reduced, the
aeration effect is optimized, and the integration degree is improved.