A settling tank with submerged drainage

Abstract

The invention provides a sedimentation tank adopting an under-liquid drainage mode. The sedimentation tank comprises: a tank body for accommodating a to-be-treated liquid; a drainage pip arranged in the tank body, wherein a water inlet hole is formed in the top of the drainage pipe, and when the sedimentation tank is in a working state, the water inlet hole is positioned below the liquid level ofthe to-be-treated liquid in the tank body; and a discharge channel, wherein one end of the discharge channel is communicated with the drainage pipe, and the other end is positioned outside the tank body. The sedimentation tank disclosed by the embodiment of the invention does not have a water flow dead zone, so that green algae and anaerobic fermentation phenomena are not prone to generating, andthe sedimentation tank is not influenced by wind blowing and local foundation settlement.

Description

technical field [0001] The invention relates to the field of sedimentation tanks and drainage of sedimentation tanks, in particular to a sedimentation tank in an underwater drainage mode. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] A sedimentation tank is a structure that uses sedimentation to remove suspended solids in water. In order to control the elevation of the liquid level in the sedimentation tank, or to transport the liquid treated in the sedimentation tank to the downstream process treatment tank for further treatment, it is necessary to design the drainage of the sedimentation tank. At present, the drainage of the sedimentation tank is mostly realized by the overflow of the sawtooth weir. [0004] However, using sawtooth weir overflow to discharge and control the liquid level of the sedimentation tank has the following problems: [0...

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Problems solved by technology

[0005] 1. In summer, green algae are easy to grow on the sawtooth weir, and in winter, it is easy to freeze, and the maintenance workload is heavy

[0006] 2. It is easy to run mud, and the content of suspended solids in the effluent is high

This requires that the sawtooth weir must be absolutely horizontal to evenly discharge water during installation, which is difficult to install

[0008] 4. When the wind blows or the local foundation settles, it will lead to uneven water discharge

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