Reciprocating subsurface flow constructed wetland filled by longitudinal substrates and application of constructed wetland

Abstract

The invention discloses a reciprocating subsurface flow constructed wetland filled by longitudinal substrates. The constructed wetland comprises a pool body, the pool body has a tank-shaped structurewith an open top, and the interior of the pool body is filled with the substrates; the substrates comprise a base layer, a generation layer, a barrier layer and a planting layer from the bottom to thetop; the generation layer comprises at least two substrates which longitudinally fill the generation layer from the left to the right; a water inlet pipe extending in a horizontal direction is arranged at the upper portion of the pool body, and a water outlet pipe is connected to the bottom of the pool body; and at least one layering partition plate of which one side is inclined downwards is arranged in the generation layer, one higher side of the layering partition plate is in tightly attached to the pool body, and one lower side is spaced from the pool body. The constructed wetland providedby the invention enables sewage to pass through the different substrates in different orders to form a reciprocating water flow, so that the sewage can be uniformly mixed during hydraulic retention,a hydraulic retention layering phenomenon is avoided, and the microbial nitrogen removal performance is enhanced.

Description

technical field [0001] The invention relates to the technical field of constructed wetlands, in particular to a longitudinal matrix-filled reciprocating subsurface flow constructed wetland and its application. Background technique [0002] With the development of society and the improvement of people's living standards, the amount of domestic sewage is increasing day by day, and the phenomenon of random discharge is serious, which not only wastes water resources, but also causes environmental pollution. As a new type of sewage treatment process, constructed wetland has the advantages of simple structure, easy maintenance, low treatment cost, and landscape effect. It plays an important role in sewage treatment and ecological environment protection, and has good promotion value. [0003] Constructed wetlands are mainly composed of three parts: substrate, plants and microorganisms. The matrix mainly plays three roles in the constructed wetland: the attachment surface for micro...

AI Technical Summary

Problems solved by technology

The application types of constructed wetlands mainly include single type and composite type. Among them, the types of composite constructed wetlands mainly include horizontal subsurface flow with upward vertical flow, and vertical flow with horizontal subsurface flow. The sewage in the existing operation mode enters in a predetermined order. The retention stratification is obvious, which leads to the reduction of nitrogen removal performance. At the same time, the carbon source in the sewage is continuously consumed during the hydraulic retention time, which further leads to the reduction of nitrogen removal performance.

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