Vertical mixed flow type constructed wetland structure

Abstract

The invention discloses a vertical mixed flow type constructed wetland structure which comprises a pool body of which the cross section is rectangular, a water inlet pipe arranged at one end of the pool body, and a drainage pipe arranged at the other end of the pool body, wherein multiple lower brick masonry walls which are perpendicular to the bottom of the pool body and are in watertight arrangement with the bottom are arranged in the pool body; multiple suspended brick masonry walls of which the bottoms are suspended are arranged among the various lower brick masonry walls at intervals; and the height of the top of each lower brick masonry wall is smaller than the height of each suspended brick masonry wall and the pool body. According to the vertical mixed flow type constructed wetland structure, the lower brick masonry walls and the suspended brick masonry walls are arranged in the pool body so as to block the water flow, so that the retention time of the water flow in the pool body is prolonged, the time of absorbing sewage by plants microbes in the pool body is prolonged, and the aim of improving the denitrification and phosphorous removal efficiency is further achieved by virtue of a simple pool body structure. The vertical mixed flow type constructed wetland structure disclosed by the invention is applied to the field of constructed wetland structures.

Description

technical field [0001] The invention relates to the field of artificial wetland pool structure, in particular to a vertical mixed flow artificial wetland structure. Background technique [0002] At present, vertical flow constructed wetlands are widely used to treat urban domestic sewage and some industrial sewage. This type of wetland refers to the intermittent distribution of sewage to the surface of the filter bed after pretreatment, and then vertical gravity flow downwards, combined with the physical filtration of the substrate and the biochemical reaction of plants and microorganisms to effectively treat various types of sewage. [0003] The traditional vertical flow constructed wetland has only a single flow direction, which is divided into upflow type and downflow type. Usually, the vertical flow constructed wetland is made of mortar bricks, and the general height is 1.0-1.5m. The sewage flows vertically by gravity from the surface of the filter bed. The water distri...

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Problems solved by technology

[0004] However, the hydraulic retention time of the traditional vertical flow artificial wetland is short, and the biochemical reaction takes a long time, and the reaction is not complete. The sewage has already flowed away quickly, so the wetland only plays a physical adsorption role. If the hydraulic retention time is prolonged, it needs to increase The area occupied by the pool violates the principle of small area occupied by constructed wetlands

Practice has proved that the removal effect of total nitrogen and total phosphorus in sewage by using a single vertical flow constructed wetland is poor, with an average removal rate of 40% to 50%. If other processes are added for auxiliary treatment, the project cost will be increased. The effect may not be ideal

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