In traditional wastewater biological treatment technology, mud-water separation is completed by gravity in the secondary sedimentation tank, and its separation efficiency depends on the settling performance of activated sludge. The better, the higher the mud-water separation efficiency. The settleability of sludge depends on the operating conditions of the aeration tank. Adjusting the settleability of sludge requires strict control of the operating conditions of the aeration tank, which limits the scope of application of this method. Due to the requirements for solid-liquid separation in the secondary sedimentation tank, the sludge in the aeration tank cannot maintain a high concentration, generally around 1.5~3.5g/L, thus limiting the biochemical reaction rate. Hydraulic retention time (HRT) and sludge age (SRT) are interdependent, and increasing volumetric load and reducing sludge load are often contradictory.
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