Vertical turning flow bioretention pond

Abstract

The invention discloses a vertical turning flow bioretention pond, belongs to the field of municipal engineering, and provides a bioretention pond device capable of autonomously changing the oxygen-containing condition of rainwater, retaining and storing the rainwater and reducing suspended solids, nitrogen, phosphorus and organic matters in the initial rainwater. The vertical turning flow bioretention pond comprises a front tank wall, a rear tank wall, a left tank wall, a right tank wall, a tank bottom plate, a breather pipe, a left bottom partition plate, a right bottom partition plate, an overflow partition plate, a water passing vertical partition plate and a water distribution transverse partition plate. According to the vertical turning flow bioretention pond, an aerobic trickling filtration area is formed through the breather pipe and the water distribution transverse partition plate, so that the nitration effect of ammonium nitrogen is enhanced; through the water passing vertical partition plate and the overflow partition plate, firstly, a waterflooding anoxic saturation area is formed, and the denitrification effect of nitrate nitrogen is enhanced; a rainwater flowing path forms baffling, and the hydraulic retention time is prolonged; and thirdly, the rainwater retention capacity of the vertical turning flow bioretention pond is enhanced, the moisture required by life activities of plants and microorganisms is ensured, the biomass and activity of the plants and the microorganisms are improved, and the biological treatment capacity of the vertical turning flow bioretention pond is enhanced.

Description

technical field [0001] The invention belongs to the field of municipal engineering, and provides a multi-layer horizontal folding plate, an aerobic trickling filter area, and an oxygen-saturated saturation area, which can independently change the oxygen content of rainwater, stagnate rainwater, reduce suspended matter in initial rainwater, Ammonia nitrogen, nitrate nitrogen, organic matter and phosphorus concentration bioretention tank devices can provide a reference for the construction of sponge cities. Background technique [0002] Sponge city is an urban project planned and constructed based on the concepts of "low-impact development" and "water-sensitive city". A well-run sponge city can infiltrate, absorb, retain, purify, store and reuse rainfall runoff. It has shown good "elasticity" in terms of adapting to environmental changes and responding to natural disasters. Therefore, the construction of sponge cities that combines natural approaches and artificial measures n...

AI Technical Summary

Problems solved by technology

[0004] Bioretention ponds generally include retention layers, cover layers, soil replacement layers, perforated drainage pipes, and gravel layers, etc., which have a good interception and removal effect on suspended solids, ammonia nitrogen, and phosphorus in rainwater, but due to the lack of saturated areas, biological Detention ponds generally have a poor removal effect on nitrate nitrogen that requires anoxic denitrification process. At the same time, they lack rainwater storage structures, so the retention effect of rainwater is not obvious

In recent years, bioretention tanks with saturation zones have emerged one after another, but the setting of saturation zones is relatively simple, and is generally set at the bottom of the device

Due to the low content of organic matter in rainwater, denitrification treatment is carried out after the ammonia nitrogen is completely converted into nitrate nitrogen. At this time, a part of the organic matter has been mineralized first, which often leads to a decrease in the concentration of organic matter in the saturated area and an increase in the difficulty of decomposition, resulting in carbon dioxide in the denitrification process. Insufficient source affects the denitrification effect; in addition, the rainwater flows from top to bottom in the bioretention tank with the help of gravity, the hydraulic path is too short, and the residence time is too short to become an important factor affecting the water purification effect, and the folded plate is to increase the water quality. An important measure of path length; nitrification is an important pathway for the conversion of ammonia nitrogen to nitrate, therefore, it is necessary to take necessary structural design measures to enhance the dissolved oxygen concentration in the nitrification reaction zone in the bioretention tank

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