Working principle of inclined plate sedimentation tank

Working principle of inclined plate sedimentation tank

Inclined plate (tube) sedimentation tank is based on the principle of horizontal flow sedimentation tank. After adding many inclined tubes in the tank, the wetted perimeter of the water section of the tank is increased, and the hydraulic radius is reduced at the same time. Therefore, at the same horizontal flow rate V, the Reynolds number Re can be greatly reduced, thereby reducing water turbulence and promoting sedimentation. In addition, the addition of inclined tubes shortens the particle sedimentation distance, reduces the sedimentation time, and greatly improves the sedimentation efficiency. Inclined plate sedimentation tank is a countercurrent inclined plate sedimentation equipment, which is characterized by high sedimentation efficiency, small tank volume, simple operation and small footprint. This device is developed on the basis of digesting and introducing similar foreign equipment. It is widely used in the treatment of aluminum processing oxidation wastewater, aluminum can factory wastewater electroplating mixed wastewater, boiler room foam dust removal wastewater and water purification water treatment, and can achieve good results. Inclined plate sedimentation device is one of the solid-liquid separation equipment. According to the precipitation principle of removing dispersed particles in the horizontal flow sedimentation tank, under certain flow rate Q and certain particle settling velocity N0, the sedimentation efficiency E of the pool is proportional to the plane area A of the pool. After adding inclined plates in the sedimentation box, the sedimentation area is greatly increased, thereby improving the sedimentation efficiency. The inclined plates can also increase the wetted area of the water-passing section and reduce the hydraulic half, so that at the same horizontal flow velocity V, the Reynolds number Re can be greatly reduced, thereby reducing water turbulence and promoting sedimentation.

Working principle of inclined plate sedimentation tank

The inclined plate sedimentation tank is a commonly used water treatment equipment. Its working principle mainly includes the following steps:

1. Water flows into the inclined plate sedimentation tank: sewage enters the inclined plate sedimentation tank through a pipe. The water flow will be pre-treated before entering the sedimentation tank, such as screen filtration, to remove larger solid particles and impurities.

2. Water flows through the inclined plate: after entering the inclined plate sedimentation tank, the water flow will encounter the inclined plate, which is mostly a series of parallel plates perpendicular to the water flow. The angle and shape of the inclined plate will be adjusted according to the specific equipment design. The function of the inclined plate is to allow the water flow to flow back and forth on it, thereby increasing the contact area between the water flow and the solid particles.

3. Solid particle sedimentation: in the inclined plate sedimentation tank, heavy solid particles will be affected by gravity and gradually settle to the bottom of the pool. At the same time, the water flow will be hindered during the sedimentation process, so that the solid particles stay in the water for a longer time, increasing the sedimentation effect.

4. Clean water discharge: After the water that has passed through the inclined plate sedimentation accumulates at the bottom of the pool, the clean water will be pumped out from the upper part or side of the sedimentation tank for subsequent treatment or discharge. The unsettled suspended matter or sludge will remain at the bottom of the pool to be treated or cleaned.