Underflow landscape green land system with concentric structure for deeply disposing small-scale distributed domestic sewage

Abstract

The invention discloses an underflow landscape green land system with a concentric structure (concentric circle, concentric ellipse, concentric square, concentric polygon, and the like) for deeply disposing small-scale distributed domestic sewage. The system consists of four to six concentric partition walls, an inner waterproof mortar or a waterproof concrete; the height of the wall is declined from inside to outside along with the hydraulic gradient; rough large lime stone or dolomite particles, thin lime stone or dolomite particles and sand-containing soil are sequentially filled between the partition walls from bottom to top; a water distribution pipe is embedded in the partition wall; the system operation adopts the circulation manner of upstream-downstream-upstream to distribute water; a water inlet pipe and the water distribution pipe are embedded in a filling layer; green plant is grown on the soil; an outer circle is provided with an ecological catchment channel in which natural biological fillers such as cobblestones and dimension stones are arranged; emergent aquatic plants can be planted; yielding water in the outer circle landscape green land is in water-dropping aeration when entering the ecological catchment channel; and the quality of the yielding water can be improved through further biological contact and oxidation. The subsequent blockage of the landscape green land is prevented just by regularly cleaning the first-level filler filter bed with the least area. By using the system to process small-scale domestic sewage, the invention has the advantages of even water distribution, good treatment effect, low operation cost, stable operation, attractiveness, low maintenance load, no secondary pollution, and the like. The invention is suitable for promotion and application in disposing distributed domestic sewage in countryside, small towns and residential communities.

Description

technical field [0001] The present invention relates to the technical field of sewage treatment, specifically, refers to a concentric structure (concentric circle, concentric ellipse, concentric square, concentric polygon, etc.) applied to the advanced treatment of small-scale decentralized domestic sewage in rural areas or small towns. Greenfield treatment process. Background technique [0002] Since the 1980s, constructed wetland sewage treatment technology has been widely used in the fields of sewage treatment and surface water pollution control due to its advantages of low investment, low operation and maintenance costs, low energy consumption, and beautiful appearance. At present, typical constructed wetlands are mainly composed of soil, gravel and plants, and are mostly used for advanced treatment of sewage. Although the use of constructed wetlands to treat sewage has shown great advantages, its purification efficiency for sewage is still affected by factors such as c...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to solve the problems of poor treatment effect, complex structure and serious secondary pollution in the artificial wetland system in the process of small-scale decentralized domestic sewage advanced treatment in rural areas or small towns, and to provide a method that is adapted to local conditions and has low operating costs. A concentric structure (concentric circle, concentric ellipse, concentric square, concentric polygon, etc.) subsurface flow landscape green space treatment system with uniform water distribution, good treatment effect and stable operation

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