Sponge city low-lying land multistage cascading rotary purification system

Abstract

The invention discloses a sponge city low-lying land multistage cascading rotary purification system. The system comprises a desilting water collection pool, a rotary purification canal and a reservoir. The desilting water collection pool is disposed at the top of a low-lying land. The rotary purification canal is in spiral downward arrangement along the periphery of the low-lying land, and is isolated into several purification units by several concrete baffle plates. Each purification unit is equipped with an antiscour layer, a soil layer, a coarse sand layer and a purification layer from top down in order, the soil layer and the purification layer are internally provided with water absorption discs, two sides of the purification layer extend to the purification unit surface layer, and the section is in U-shaped distribution. Water permeable geotextile is disposed at the contact part of the purification layer and the soil layer and the coarse sand layer. The reservoir is arranged at the bottom of the low-lying land, and the bottom is provided with a water pumping pump. The system provided by the invention not only can green and beautify the environment, but also can absorb heavy metals and other hazardous substances in water, and is of important reference significance for urban non-point source pollution control, rainwater purification recycling and sponge city construction.

Description

technical field [0001] The invention belongs to the technical field of rainwater storage and purification in sponge cities, and in particular relates to a multi-stage stacked water rotary purification system in low-lying areas of sponge cities. Background technique [0002] Sponge city refers to a city that, like a sponge, has good "elasticity" in adapting to environmental changes and responding to natural disasters. It absorbs, stores, seeps and purifies water when it rains, and "releases" the stored water when needed. and use it. The construction of sponge cities should follow the principles of ecological priority, combine natural ways with artificial measures, and maximize the accumulation, infiltration and purification of rainwater in urban areas on the premise of ensuring the safety of urban drainage and waterlogging prevention, and promote the utilization of rainwater resources. and ecological environment protection. [0003] With the large-scale application of pesti...

AI Technical Summary

Problems solved by technology

[0005] The existing sponge city ecological measures still have certain disadvantages. For example, the traditional grass-planting ditch is mainly for water seepage, and the amount of runoff reduction is very limited; while the traditional small-scale ecological wetlands are mainly set in flat and open areas or communities, which is likely to cause water quality problems. Deterioration, mosquito breeding, affecting the regional environment; the rain garden landscape effect is better, but the problem of rainwater purification collection and utilization is not considered

Existing ecological purification beds or artificial purification wetlands occupy a large area and need to artificially create a certain hydraulic gradient to realize the natural flow of water under gravity

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