Vertical flow denitrification device for rainstorm runoff in mountainous cities

Abstract

The invention discloses a mountainous city storm radial-vertical flow type denitrification device. The device is composed of an overflow port 1, a planting layer 2, a filtering layer 3, a denitrification layer I4, a denitrification layer II5, a planting vegetable 6, an outfall 7, and a geotechnical cloth 8, wherein the overflow port 1 is 0.5-1.0m higher than the surface layer of the planting layer 2, the thickness of the planting layer 2 is 0.3-0.5m, and the planting layer 2 is composed of a sandy soil mixture in sand and soil volume ratio of 8: 2; the filtering layer 3 is located at the lower part of the geotechnical cloth and composed of river sand; the denitrification layer I4 is located at the lower part of the filtering layer 3, and the height is 1.0m, and the cross section of the denitrification layer I4 is 1 / 3-1 / 2 that of the filtering layer 3; the denitrification layer I4 is composed of an outer room 9, a middle room 10 and an inner room 11; the denitrification layer II5 is located at the lower part of the denitrification layer I4, and the inner chamber 11 of the denitrification layer II5 is communicated with the outer chamber 9 of the denitrification layer I4. The denitrification device has the following advantages: (1) the structure is compact, and the floor is saved; (2) the denitrification efficiency is high, and the control effect to the initial rainfall radial flow pollution is good.

Description

technical field [0001] The patent belongs to the technical field of environmental protection, and specifically relates to the removal of nitrogen from storm runoff in mountain cities, and is especially suitable for the removal of dissolved nitrogen from storm runoff on roads with large slopes. Background technique [0002] The eutrophication of water bodies is one of the major water environmental problems that my country is currently facing, and it has become an important bottleneck restricting the development of my country's national economy. Nitrogen is the primary nutrient limiting factor for the growth of plants, algae and microorganisms, and is one of the main driving elements for eutrophication in water bodies. Excessive input and enrichment of nitrogen in water bodies often lead to changes in the aquatic ecological environment [Collins K A, Lawrence T J , Stander E K, Jontos R J, Kaushal S S, Newcomer TA, Grimm N B, Cole Ekberg M L. Opportunities and challenges for ma...

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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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