Multi-flow-state constructed wetland sewage treatment device

Abstract

The invention relates to a multi-flow-state constructed wetland sewage treatment device, and belongs to the technical field of wastewater treatment. Comprising a water distribution pool, a combined flow constructed wetland pool and a water collection and drainage pool, the combined flow constructed wetland pool comprises a vertical downstream constructed wetland pool, a vertical upstream constructed wetland pool and a horizontal flow constructed wetland pool, the water distribution pool, the combined flow constructed wetland pool and the water collection and drainage pool are sequentially connected in series and adjacently arranged from left to right, and the bottom surfaces of the water distribution pool, the combined flow constructed wetland pool and the water collection and drainage pool are located on the same horizontal plane; the heights are the same. According to the invention, three flow states are realized in one set of constructed wetland device, and pollutants such as biochemical oxygen demand, nitrogen, phosphorus and solid suspended particulate matters in a water body are reduced at the same time.

Description

technical field [0001] The invention relates to a multi-flow artificial wetland sewage treatment device, which belongs to the field of sewage treatment. Background technique [0002] The existing constructed wetland system mostly adopts the horizontal subsurface flow constructed wetland process, which is used as a deep purification process for the tail water of the urban sewage treatment plant. The effluent from the secondary sedimentation tank of the sewage treatment plant flows directly into the constructed wetland system without sedimentation treatment, and there is flow in various parts of the wetland system. , flow rate, and dissolved oxygen content are unevenly distributed, which can easily cause many problems such as blockage of the wetland system. At the same time, most of the existing constructed wetland systems use fixed water level overflow to discharge water, and no liquid level adjustment system is installed at the water outlet. This process is more suitable in ...

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Problems solved by technology

[0002] The existing constructed wetland system mostly adopts the horizontal subsurface flow constructed wetland process, which is used as a deep purification process for the tail water of the urban sewage treatment plant. The effluent from the secondary sedimentation tank of the sewage treatment plant flows directly into the constructed wetland system without sedimentation treatment, and there is flow in various parts of the wetland system. , flow rate, and dissolved oxygen content are unevenly distributed, which can easily cause many problems such as blockage of the wetland system

At the same time, most of the existing constructed wetland systems use fixed water level overflow to discharge water, and no liquid level adjustment system is installed at the water outlet. This process is more suitable in warm regions in the south, but it is easy to freeze under low temperature conditions in winter in northern regions, and the wetland system is not stable. operation, which leads to problems such as poor removal of nitrogen, phosphorus, organic matter, etc.

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