How to improve the sedimentation effect of the sedimentation tank

The sedimentation tank is the most widely used treatment structure in the sewage treatment process. How to improve the removal efficiency of the sedimentation tank and reduce the volume of the sedimentation tank is worth studying and discussing. In addition to adding inclined plates (pipes) in the sedimentation area to improve the separation effect and treatment capacity of the sedimentation tank, other methods include: sewage aeration and stirring and partial activated sludge return. Aeration and agitation is to use the agitation of air bubbles to promote the interaction of suspended particles in sewage and produce natural flocculation. Using this pre-aeration method, the sedimentation efficiency can be increased by 5% to 8%, and the aeration volume per cubic meter of sewage is about 0.5m3. The pre-aeration method should generally be carried out in a specially designed structure - a pre-aeration tank or a biological flocculation tank. The remaining activated sludge is added to the sewage stream, and the activity of the sludge is used to generate adsorption and flocculation. This process is called biofloc. This method is widely used at home and abroad. Using this method, the sedimentation efficiency can be increased by 10% to 15% compared with the original sedimentation tank, and the removal rate of BOD5 can also be increased by more than 15%. The dosage of activated sludge is generally between 100-400mg/L. In industrial sewage treatment, due to the uneven water quality and water volume, sewage adjustment tanks are generally installed, and some aeration equipment is installed in the adjustment, which can effectively improve the degree of sewage treatment and prevent silt from entering the adjustment tank. deposition. For the secondary settling tank in the activated sludge system, when the mixed liquid in the aeration tank enters the secondary settling tank, there must be a re-flocculation process. Studies have shown that the effect of reflocculation can greatly affect the properties and settling performance of activated sludge. Therefore, the self-flocculation of activated sludge after entering the secondary settling tank is worth studying and discussing.
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