Rotational flow flocculation device and sedimentation tank with same

Abstract

The invention discloses a rotational flow flocculation device which comprises a rapid mixing zone, a rotational flow layering zone, a rotational flow separation zone, a backflow diversion zone and a stirring diversion device. A rotational flow propelling device is arranged at the tail end of the rapid mixing zone, and provides flow state power taking circumferential flow as a main flow and axial flow as an auxiliary flow, so that a relatively strong rotational flow state can be formed in the rotational flow layering zone; meanwhile, a rotational flow rectifying device is mounted at the initial section of the rotational flow layering zone so that the rotational flow state is more stable; due to the cone angle design of the rotational flow separation zone, fine particles which are not flocculated can form rotational flow to enter the backflow diversion zone so as to continue to be subjected to circular reaction in the device, and coarse particles which have generated large floccules continue to spirally move downwards along the device wall to form outer rotational flow and are finally discharged out of the device; and the rapid stirring blades provide power for high-shear-strength stirring in the rapid mixing zone. The invention further discloses a sedimentation tank with the rotational flow flocculation device.

Description

technical field [0001] The invention relates to the technical field of sewage treatment equipment, in particular to a swirling flow flocculation device and a sedimentation tank equipped with it. Background technique [0002] Flocculation refers to the aggregation of suspended particles in water or liquid, or the formation of flocs, so as to accelerate the aggregation of particles and achieve the purpose of solid-liquid separation. This phenomenon or operation is called flocculation. Usually, flocculation is implemented by adding an appropriate flocculant, whose function is to adsorb particles and "bridge" between particles, thereby promoting agglomeration. [0003] At present, with the development of society, people pay more attention to the pollution caused by waste water to the environment, so many water treatment systems have been established. In the water treatment system, the coagulation and sedimentation operation unit is the initial operation unit and the core operat...

AI Technical Summary

Problems solved by technology

If the particle size of the generated suspended particles is small, it will directly cause the particles to fail to settle and be discharged with the effluent, and the water quality cannot meet the requirements

[0004] However, there are many problems in the existing coagulation and sedimentation devices: first, the design is simple, and the small surface load is blindly used, resulting in a large footprint; second, the sedimentation effect is not good, and the existing coagulation devices generate small suspended particles, It is not conducive to sedimentation, resulting in turbidity of the effluent from the clarification tank, which cannot meet the requirements

Images