Cascaded combined-flow artificial wetland system and sewage ecological purifying method thereof

Abstract

The invention provides a cascaded combined-flow artificial wetland system and a sewage ecological purifying method of the cascaded combined-flow artificial wetland system, which belong to the technical field of environmental engineering. The cascaded combined-flow artificial wetland system provided by the invention is formed by basic units of the cascaded combined-flow artificial wetland in an independent form or in a combined form. The basic units of the cascaded combined-flow artificial wetland are in central axis symmetry and comprise a cut-off dam, a first level wetland, a second level wetland, a transition zone wetland and a natural wetland joined in a cascaded manner. The system disclosed by the invention is applied to sewage treatment, and can enhance the agility of treating different pollutions for the artificial wetland and expands the application range of sewage treatment; can effectively remove obstructions in the artificial wetland system and ensures the long-acting operation of the artificial wetland system; has a cascaded shape and the transition zone wetland and expresses self-purification function of the natural wetland so that the sewage treatment effect is good; and is bordered on the natural wetland to protect the natural ecological system of water body.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a cascade composite flow constructed wetland system and a sewage ecological purification method thereof. Background technique [0002] The existing constructed wetlands are mainly divided into surface flow wetlands, subsurface flow wetlands and vertical flow wetlands according to different water flow modes. In practical engineering applications, these three types of wetlands have their own advantages and disadvantages: surface flow wetlands have good reoxygenation effects due to the overflow of sewage on the surface of the wetlands, but they are easy to breed mosquitoes and flies, resulting in poor environmental sanitation conditions, and the treatment effect is greatly affected by climate. ; Subsurface flow wetlands have good environmental sanitation due to the water flowing inside the filler, but the effluent dissolved oxygen is low, and its denitr...

AI Technical Summary

Problems solved by technology

In practical engineering applications, these three types of wetlands have their own advantages and disadvantages: surface flow wetlands have good reoxygenation effects due to the overflow of sewage on the surface of the wetlands, but they are easy to breed mosquitoes and flies, resulting in poor environmental sanitation conditions, and the treatment effect is greatly affected by climate. ; Subsurface flow wetlands have good environmental sanitation due to the water flowing inside the filler, but the effluent dissolved oxygen is low, and its denitrification effect is affected; the nitrification capacity of vertical flow wetlands is higher than that of subsurface flow wetlands, but it takes longer to dry / flood blockage occurs

Constructed wetlands in this governance mode usually form a self-contained system, less consideration is given to the natural transition and connection with natural water bodies, the water ecosystem is artificially divided, and its continuity is destroyed. At the same time, the self-purification ability of natural wetlands is not fully utilized.

[0004] Therefore, the existing artificial wetlands have disadvantages such as narrow application range, easy blockage of wetland fillers, unstable treatment effect, short operating life, and no natural connection with natural water bodies.

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