The impact of the flow state of the horizontal sedimentation tank on the sedimentation effect of impurities in the water

The horizontal sedimentation tank is a common facility in water treatment, whose main function is to make suspended particles in the water settle down through the slow flow of water, thereby achieving the purpose of purifying water quality. The flow state of the horizontal sedimentation tank has an important impact on the sedimentation effect of impurities in the water. This article will discuss aspects such as flow velocity, flow pattern, and velocity distribution, in order to provide a reference for the design and operation of the horizontal sedimentation tank.

One, flow velocity

Flow velocity is an important factor affecting the sedimentation effect of impurities in the horizontal sedimentation tank. In the horizontal sedimentation tank, the faster the flow velocity, the shorter the contact time between particles and the bottom of the tank, and the poorer the separation effect of particles from water. However, if the flow velocity is too slow, it will prolong the stay time of particles in the tank, leading to a decrease in the sedimentation effect. Generally speaking, the flow velocity of the horizontal sedimentation tank should be controlled between 0.1-0.3 m/s to ensure the best sedimentation effect.

Two, flow pattern

The flow state in the horizontal sedimentation tank can be divided into uniform flow, turbulent flow, and swirling flow, etc. Among them, uniform flow is the most ideal flow state, which can ensure the uniform distribution of particles in the tank and improve the sedimentation effect. Turbulent flow and swirling flow will lead to uneven distribution of water flow, making the distribution of particles in the tank uneven and reducing the sedimentation effect. Therefore, when designing the horizontal sedimentation tank, efforts should be made to avoid uneven distribution of flow state.

Three, velocity distribution

The velocity distribution of the horizontal sedimentation tank is also an important factor affecting the sedimentation effect. Inside the tank, the flow velocity gradually decreases from the inflow end to the outflow end, which helps to evenly distribute the particles in the tank and improve the sedimentation effect. However, if the velocity distribution is uneven, it will lead to uneven distribution of particles in the tank, reducing the sedimentation effect. Therefore, when designing the horizontal sedimentation tank, efforts should be made to ensure the uniformity of velocity distribution.

Four, other influencing factors

In addition to flow velocity, flow pattern, and velocity distribution, parameters such as water depth, tank length, and tank width of the horizontal sedimentation tank will also affect its sedimentation effect. Generally speaking, the greater the water depth, the better the sedimentation effect; the greater the tank length and width, the worse the sedimentation effect. Therefore, when designing the horizontal sedimentation tank, the size and shape should be reasonably selected based on the water quality conditions and treatment requirements.

In general, the flow state of the horizontal sedimentation tank has an important impact on the sedimentation effect of impurities in the water. When designing and operating the horizontal sedimentation tank, the size and shape of the tank should be reasonably selected based on parameters such as flow velocity, flow pattern, and velocity distribution, in order to ensure the best sedimentation effect. At the same time, regular maintenance and cleaning of the horizontal sedimentation tank should be carried out to maintain its good operating state.