A multi-layer circulating vertical constructed wetland system

Abstract

The invention discloses a multilayer circulating vertical constructed wetland system which comprises a wetland base course unit, a multilayer circulating unit, an aquatic plant unit and a water inlet and outlet unit, wherein the wetland base course unit comprises a reaction tank and an anti-seepage wall laid in a manner of close attachment to the inner wall of the reaction tank. According to the system, filler layers are vertically connected through three pipelines, and are connected through second flanges, so that a good mutual sealing effect can be achieved; only the corresponding pipeline is required to be directly taken out for replacement of an inner filler, and the whole wetland system is not required to be dug out, so that a relatively better effect is achieved, and more convenience is brought to replacement; every three pipelines are connected to form a circulating pipe, each wetland system comprises three groups of circulating pipes, and sewage flows into a part above any circulating pipe, and flows out of parts above the other two groups of circulating pipes, so that a circulating filtering effect, higher filtering efficiency and higher effectiveness can be achieved under the same occupied area.

Description

Technical field [0001] The invention relates to the technical field of constructed wetland, in particular to a multi-layer circulating vertical constructed wetland system. Background technique [0002] Constructed wetland is artificially constructed and controlled to operate on the ground similar to marshland. The current constructed wetland system is generally divided into horizontal flow, subsurface flow and vertical flow. The vertical flow constructed wetland has a smaller footprint than other forms of wetland. It is widely used because of its high efficiency and the whole system can be built completely underground. [0003] In a vertical flow constructed wetland, sewage infiltrates vertically downward from the surface layer, and passes through different filler layers in the downward flow process to achieve the purpose of purification. It has a strong ability to treat aerobic organic matter in the wastewater, but it is Practice has proved that some vertical flow constructed wet...

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Problems solved by technology

[0003] In the vertical flow artificial wetland, the sewage infiltrates vertically downward from the surface layer, and passes through different packing layers successively in the process of flowing downward to achieve the purpose of purification. It has a strong ability to treat aerobic organic matter in wastewater, but now Some vertical flow constructed wetlands have been proved to have the following disadvantages by practice: 1. The filling layer is too single, resulting in unstable treatment effect, and the nitrogen and phosphorus content in the effluent is easy to exceed the standard; It is very troublesome to dredge; 3. The packing layer needs to be replaced after a period of use. The existing vertical constructed wetland needs to dig up all the wetland to replace the packing layer, which is very inconvenient; 4. The current vertical constructed wetland directly imports sewage, and then Purify by flowing down vertically in the direction of gravity, which cannot achieve a better circulation and filtration effect under the existing floor area, and the efficiency cannot reach higher

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