Device for efficient control of runoff nitrogen element pollution in mountainous region and city roads

Abstract

The invention discloses a device for efficient control of runoff nitrogen element pollution in mountainous region and city roads, and the device comprises a vegetation growth medium layer (2), a filter layer (3), a carbon source layer (4) and a secondary filter layer (5); the vegetation growth medium layer (2) has a thickness of 0.2 meter, and is formed by a soil type with higher permeability coefficient; the filter layer (3) has a thickness of 1 meter, and is prepared by mixing ceramsite, zeolite and other filler with adsorption capacity with quartz sand; the carbon source layer (4) has a thickness of 0.3 meter, and is prepared by mixing limestone with a persistent carbon source; and the secondary filter layer (5) is prepared by mixing adsorption filler and the quartz sand. The device has the following advantages: the device realizes short-term efficient removal of storm runoff nitrogen element concentration in mountainous regions and cities without power, not only realizes the rapid removal of nitrogen, also avoid secondary pollution of effluent; the device is flexible in arrangement and convenient in installation, does not affect the city landscape, and is especially suitable for the control of storm runoff nitrogen element pollution in heavy-slope road surfaces.

Description

technical field [0001] The patent of the invention belongs to the technical field of environmental protection, and specifically relates to the removal of nitrogen in storm runoff in mountainous cities, and is especially suitable for the removal of dissolved nitrogen in storm runoff on steep road surfaces. Background technique [0002] Water eutrophication is one of the major water environment problems that our country is currently facing, and has become an important bottleneck restricting the development of our national economy. Nitrogen is the primary nutrient limiting factor for the growth of plants, algae and microorganisms, and one of the main driving elements that cause eutrophication in water bodies. Excessive input and enrichment of nitrogen in water often lead to changes in aquatic ecological environments[Collins K A, Lawrence T J , Stander E K, Jontos R J, Kaushal S S, Newcomer T A, Grimm N B, Cole Ekberg M L. Opportunities and challenges for managing nitrogen in ur...

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Problems solved by technology

Patent document CN101913709A "A Composite Ecological Interception Filler and Preparation Method" proposes a filler for urban rainstorm runoff nitrogen and phosphorus interception, but this technology is mainly aimed at open water bodies such as lakes; patent document CN1446759A "Composite wetland ecological method for nitrogen and phosphorus pollution control and Its system” proposed a control technology for nitrogen pollution in storm runoff, but this technology is relatively complex and has a long hydraulic retention time, which is not suitable for mountainous cities with tight land use.

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