Novel vegetation shallow trench and method for processing runoff rainwater by using same

Abstract

The invention provides a novel vegetation shallow trench and a method for processing runoff rainwater by using the novel vegetation shallow trench. The novel vegetation shallow trench comprises a vegetation layer and a shallow trench, wherein the shallow trench comprises a shallow trench bottom (1) and a slope (2), and an infiltration/drainage pipe (3) is buried in the shallow trench bottom (1). When surface runoff rainwater (9) enters the shallow trench and flows along the slope, the runoff can be purified through retention, filtering of vegetation (7), absorption and permeation, a part of runoff rainwater accumulated at the shallow trench bottom (1) enters a filter material layer surrounding the infiltration/drainage pipe (3) through infiltration effect, and the filtered runoff rainwater is drained into a receiving water body or other processing facilities through the infiltration/drainage pipe (3). Since the infiltration/drainage pipe (3) is designed at the shallow trench bottom, the novel vegetation shallow trench is remarkably improved in transmission, filtering and infiltration capabilities, has the advantages of small floor space, compact structure and strong contaminant blockage capability, and thus is applicable to a rainwater runoff pollution control system for high-density areas of a city.

Description

technical field [0001] The invention relates to the technical field of rainwater collection and treatment, in particular to a new type of vegetation shallow ditch and a rainwater recycling treatment method that can efficiently intercept and remove pollutants in rainwater runoff, and can effectively reduce the runoff flow velocity and reduce the peak flow of runoff. Background technique [0002] The construction of municipal drainage systems is not perfect in many cities. For example, in Chinese cities, with the expansion of cities, the problems of urban waterlogging and non-point source pollution in drainage systems have become increasingly prominent. In recent years, waterlogging has occurred frequently in various cities in China, which has brought huge economic losses to the country and society, and also seriously threatened the safety of residents. This has made waterlogging a social problem that has received more and more attention. There are many reasons for urban water...

AI Technical Summary

Problems solved by technology

Some cities hope to solve this problem by increasing the return period of pipeline design, but there are a series of problems such as complex structure of urban pipeline system, long construction period, high investment and maintenance costs, and the complex structure of underground pipelines in old urban areas, difficult construction, etc.

[0003] In addition, some large cities in my country, such as Beijing and Shanghai, have basically completed the control of point source pollution, but the situation of non-point source pollution is still severe.

Rainwater runoff is the main source of urban non-point source pollution, and its biodegradability is poor, BOD 5 : COD is usually less than 0.2, SS content is high, and contains a certain amount of N, P and other nutrients and heavy metal ions, and generally the rainy season is concentrated, and the amount and quality of rainwater runoff fluctuate greatly. high cost

[0004] The Chinese Utility Model Patent No. 200920208812.X discloses an automatic rainwater collection treatment device consisting of rainwater collection automatic diversion station, rainwater regulation and storage, advanced treatment, water storage control and PLC integrated control. The device occupies a small area , the construction and installation are simple, and the system integration and control integration run automatically, but the effect is not good in rainwater purification, especially in the treatment of chemical pollutants

Another example is the Chinese invention patent application with the application number of 201010623420.7, which discloses a rainwater runoff enhanced treatment reuse parking space and sidewalk system. In the pit with a depth of 1.2-1.5m, a water-resistant layer and a pebble support layer are arranged in sequence from bottom to top. , adsorption packing layer, filter packing layer, steel grid plate layer, permeable layer, the system also includes a water-resisting layer as the bottom of the well and concrete as the well wall that runs through other layers of the reuse water well, and the pebble support layer is horizontally set Water collection pipe layer, the water collection pipe layer is composed of water collection pipes with holes connected in a criss-cross pattern, one or more water collection pipes are connected to the reuse water well through openings on the well wall of the reuse water well. This technical scheme has the characteristics of water permeability, It has multiple functions such as filtration, adsorption, storage and reuse of rainwater, but the structure is complex and difficult to implement and maintain

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