An artificial wetland system for deep purification of reclaimed water in alpine regions

Abstract

The invention provides a reclaimed water deep-purification constructed wetland system suitable for treating urban and rural domestic sewage in high-cold hypoxia regions of the Qinghai-Tibet Plateau. The system includes a water-distributing regulation pool, an underflow constructed wetland unit, an underflow unit water distribution system, an underflow water outgoing well, a surface flow constructed wetland and a system tail end water outgoing well; the front-end water-distributing regulation pool has an aeration function, and is provided with a reflux device; the underflow constructed wetland unit is a composite-flow type underflow constructed wetland, and is used for primary purification treatment on the sewage; a pool body of the underflow constructed wetland unit is internally provided with an impervious layer, a substrate filler layer and a planting soil layer, and has the surface planted with aquatic plants; the underflow unit water distribution system includes that the front end of a pool body is provided with a unit water-distributing system, the rear end of the pool body is provided with a unit water-collecting system and a unit inverted membrane system, and the tail end of the pool body is provided with a water collecting canal; the surface flow constructed wetland is used for secondary purification treatment on the sewage.

Description

technical field [0001] The invention relates to an artificial wetland system for deep purification of reclaimed water in alpine regions, and belongs to the technical field of sewage treatment. Background technique [0002] Constructed wetland is a complex sewage treatment ecosystem composed of substrate (stone, sand, soil, cinder, etc.), wetland plants, microorganisms and water body, which is artificially designed, constructed and regulated by simulating natural wetland. Wetland functions and characteristics Wetland structures or wetland areas have a great strengthening effect on sewage purification treatment, wetland ecological functions and landscape functions. Its purification principle is mainly to use the triple synergistic effect of physics, chemistry and biology of the four-in-one composite ecosystem of "matrix-aquatic plants-microbes-water body", through filtration, adsorption, co-precipitation, ion exchange, chemical degradation, plant absorption and Microbial deco...

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Problems solved by technology

However, the two-stage subsurface flow constructed wetland used in this process structure is a vertical subsurface flow constructed wetland. This process can only be applied to the sewage treatment operation in the non-freezing period in the southern and northern plains, and this process has no antifreeze structure design, which cannot meet the requirements of the Qinghai-Tibet Plateau. Operational requirements in alpine anoxic regions

[0005] In addition, the above two processes have no structural design for anti-blocking, inverted membrane dredging, and water level regulation in different seasons. For the sewage treatment in the alpine region of the Qinghai-Tibet Plateau, there are high altitude, perennial hypoxia, low temperature, and long freezing period. The characteristics of large differences in climate conditions in different seasons are not applicable

At present, none of the existing constructed wetland technologies can meet the year-round stable operation requirements in the alpine regions of the Qinghai-Tibet Plateau

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