Modular combined constructed wetland

Abstract

The invention belongs to the technical field of sewage treatment or river ecological restoration, and particularly relates to a modular combined constructed wetland. The modular combined constructed wetland comprises a plurality of wetland blocks which are connected in series through water distribution channels, each water distribution channel is connected with a main water distribution channel through a gate valve, and perforated walls are arranged at the joints of the water distribution channels and the wetland blocks. Sewage enters a first water distribution channel through the main water distribution channel after being pretreated, is uniformly distributed to a first wetland block, is collected by a second water distribution channel after being treated, is uniformly distributed to a second wetland block, and similar operations are conducted in turn until the sewage is treated by a fourth wetland block, is collected by a fifth water distribution channel and then is discharged. Under the same constructed wetland area, after the constructed wetland is divided into four same modules to be combined, compared with an original constructed wetland, the maintenance cost is saved by 70% or more, and the short-flow phenomenon is obviously reduced due to the effect of multiple times of water distribution.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment or river ecological restoration, and in particular relates to a modular combined constructed wetland. Background technique [0002] Constructed wetland is a semi-ecological sewage treatment system through artificial design and transformation. It is mainly composed of three parts: soil matrix, aquatic plants and microorganisms. Constructed wetlands can be divided into surface flow constructed wetlands and subsurface flow constructed wetlands according to their internal water levels, and subsurface flow wetlands can be divided into horizontal subsurface flow constructed wetlands and vertical subsurface flow constructed wetlands according to the direction of water flow. The advantages of the surface flow constructed wetland treatment system are low investment and operation costs, simple construction, operation and maintenance, but it occupies a large area, the surface of the surface flow con...

AI Technical Summary

Problems solved by technology

With the prolongation of time, on the one hand, the suspended matter in the sewage is filtered and intercepted by the filler, on the other hand, the microorganisms on the filler multiply, and the two work together to cause blockage, which affects the sewage treatment effect. During the process, it is easy to form the short-flow phenomenon of water flow (that is, the water flow concentrates and flows through the channel with less resistance)

In the past, most of the artificial wetlands were built as a whole. After the surface was covered with soil matrix, it was difficult to judge the location of the blockage. To solve the blockage problem, all the fillers had to be refilled, which was very expensive, and the sewage could not be treated during maintenance.

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