Water distribution device for reinforcing treatment of slope interception

Abstract

The invention belongs to the technical field of environmental protection, particularly relates to a water distribution device for reinforcing treatment of slope interception. The water distribution device for the reinforcing treatment of the slope interception is composed of an air conduit and a medium layer; basic processes of distributing non-point source runoffs of a city are as follows: when the urban non-point source runoff is smaller, polluted water flows through the medium layer, then infiltrates into a subsurface flow constructed wetland and enters a river channel through a water outlet of the subsurface flow constructed wetland; and when the urban non-point source runoff is larger, the polluted water partially infiltrates and enters the river channel through the water outlet of the subsurface flow constructed wetland, and the other part of the polluted water is subjected to surface flowing along the medium layer and directly discharges into the river channel. The subsurface flow constructed wetland is communicated with air by the set air conduit, so that the air in a constructed wetland is enabled not to be compressed for the infiltration of the polluted water, and the infiltration amount is kept. Under the premise of short land resource, the water distribution device provided by the invention can organically combine the subsurface flow constructed wetland and a riparian buffer zone together, is simple and convenient to maintain, and provides a new disposal method to solve urban non-point source pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a water distribution device for enhanced treatment of slope bank interception. Background technique [0002] With the acceleration of the development of urbanization in my country, the proportion of permeable ground area is getting smaller and smaller, and urban non-point source pollution caused by storm runoff has become one of the main sources of water environmental pollution in receiving water bodies. Urban non-point source pollution is the accumulation and transfer of pollutants in sunny days, the collection and transport of runoff in rainy days, and the continuous cycle of the process of entering the receiving water body and causing pollution. Because the runoff contains a large amount of pollutants, the pollution load generated by the initial runoff At the same time, due to the high proportion of impermeable land in the city, the storm runoff ha...

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Problems solved by technology

[0003] At present, research on urban non-point source pollution control has been actively carried out at home and abroad. The widely used engineering measures include vegetation filter strips, retention / retention systems, artificial wetlands, infiltration systems, filtration systems, green roofs, and grass ditch. Engineering technology has achieved good decontamination effects in application, but there are still many shortcomings: Vegetation filter belt is a very simple and effective measure for storm runoff control, but its removal mechanism for pollutants is very complicated. Grass is the most commonly used Plants have high decontamination efficiency, but the type and density of grass and the size, shape, flexibility and structure of leaves will affect the decontamination effect of pollutants, and when the runoff is large, the decontamination of vegetation filter belt The effect becomes worse; the detention and retention system includes ponds, underground pools, culverts, water storage tanks, etc., and the construction cost of underground water storage devices is generally high, and it is relatively difficult to clean and maintain; for ponds with complex structures, runoff inlets, planting plants and Its terrain will also affect its hydrological conditions; constructed wetland technology is widely used in the treatment of storm runoff, which plays an important role in the removal of pollutants, but it must be reasonably designed according to the characteristics of storm runoff to avoid blockage of wetlands At the same time, it is necessary to adjust the water level in the dry season or rainy season to ensure the normal growth of wetland plants; the infiltration system usually includes seepage pits, seepage channels, porous pavement, etc., and the matrix materials in the seepage pits need to be replaced irregularly to avoid polluting groundwater; The volume of the seepage channel is limited, so it mainly deals with high-frequency and low-flow storm runoff and initial runoff on impervious surfaces. In urban areas with high-density buildings, the function of the seepage channel will be reduced; The removal effect is obvious, but due to the small pores of the porous pavement, clogging is prone to occur in areas with high particulate matter content, which requires better maintenance conditions; the filtration system is mostly used to treat initial runoff or small catchment areas. Heavily polluted runoff, but it is easy to block if not properly maintained, and the impact of large-flow runoff should be avoided during application to prolong its service life; the water quality of green roof runoff varies greatly from region to region. In addition to the influence of natural rainfall water quality, the selected construction substrate the nature of the key

To seek the level of nutrient salt content that can meet the needs of plant growth and at the same time control the release of nutrient salt, cheap and eco-friendly construction materials are one of the ways to solve this problem; the operation efficiency of grass planting ditch is obviously affected by construction materials, system blockage, Influenced by factors such as plant species, terrain characteristics, and soil types, the blockage problem of the grass planting ditch system and its solution are still controversial, and design standardization is an urgent problem to be solved

[0004] Common source control engineering measures for urban non-point source pollution are mainly divided into two categories: infiltration systems and retention measures. For areas with low groundwater levels, infiltration systems such as infiltration wells and infiltration ditches can be used, and common retention measures Including roof rainwater storage, road storage and drainage, storage and stranded open space, low-lying green land, etc. The applicability of roof rainwater storage is not strong mainly because the construction cost of the storage tank is high and the building needs to have good impermeability and pressure bearing capacity Road storage and drainage can be used for highways and expressways, but due to the large void ratio of the roadbed, its load-bearing load is lower than that of ordinary roads, so the road base of these roads needs to be thickened to avoid the road from being crushed, and it is used for load For smaller sidewalks and parking lots, it is necessary to prevent road blockage; green space construction needs to solve the problem of water accumulation in the lawn. If this problem is solved by using flood-resistant grass species and building a low lawn drainage system, the cost of lawn construction and maintenance will be increased ; and use the space of the parking lot, square, and playground to lower their elevation and make it a low-lying ground to temporarily store rainwater. Although it will not cause flooding accidents, it is inconvenient to use

[0005] Although there are many types of urban non-point source pollution control technologies, they all face shortcomings such as large footprints. If combined technology methods are used, the advantages of various technologies can be fully utilized to make up for their respective shortcomings. ideal technical means

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