Bioretention pond with deep denitrification function

Abstract

The invention belongs to the technical field of sponge city construction and rainwater treatment, and relates to a bioretention pond device with a deep denitrification function, which is suitable for retention and treatment of urban rainfall with relatively serious pollution and relatively high nitrogen and phosphorus concentration. The device comprises a planting chamber located on the upper portion of the inner side, a trickling filter pipe located on the lower portion of the inner side, a reaction tank located on the outer side and a drainage ring pipe located in the middle of the outer side. A front chamber plate, a rear chamber plate, a left chamber plate, a right chamber plate and a bottom chamber plate form a hollow cavity structure of the planting chamber; ventilation pipes are located at four corners of the planting chamber; the trickling filter pipe is positioned at the lower part of the planting chamber; the reaction tank comprises a front tank wall, a rear tank wall, a left tank wall, a right tank wall and a bottom tank wall; and a front pipe section, a rear pipe section, a left pipe section and a right pipe section form a mouth-shaped annular loop of the drainage ring pipe. The invention provides the bioretention pond device which is simple to operate and maintain and has outstanding rainwater retention capacity and relatively strong nitrification and denitrification capacity.

Description

technical field [0001] The invention belongs to the technical field of sponge city construction and rainwater treatment, and provides a bioretention tank device with deep denitrification function, which is suitable for stagnation and treatment of urban rainfall with relatively serious pollution and relatively high concentration of nitrogen and phosphorus . Background technique [0002] Sponge city has functions such as runoff reduction and collection, rainwater purification and rational utilization, and is a concept of sustainable urban construction actively advocated by my country in the new era. In the construction of sponge city, using the permeable underlayment to infiltrate, collect and store the urban rainfall runoff, and combine the combined effect of plants + microorganisms + soil to purify the rainwater quality is to implement the low-impact development (LID) strategy and alleviate urban floods. It is an important means to solve the problem of environmental polluti...

AI Technical Summary

Problems solved by technology

However, the existing bioretention tank technology is not stable for nitrogen purification in rainwater, especially the removal of nitrate nitrogen is not ideal, and higher concentrations of nitrate nitrogen and total nitrogen can often be detected in the discharged water

The main reason is that the anoxic denitrification function of ordinary bioretention tanks is weak, resulting in ammonia nitrogen being converted into nitrate by nitrification, which has been retained in the system and cannot be converted into gaseous form in time to be released from the system into the atmosphere

In response to the above problems, most bioretention tanks strengthen the denitrification function by setting submerged anaerobic zones, but the common structure of the device is single, the filler is difficult to replace, and the sustainable use effect of the device is poor, which brings difficulties to the operation and maintenance of the equipment. In addition, when the amount of rainwater is too large, the drainage perforated pipe of the device has a poor ability to store rainwater, so that the operation of the device has a certain water limit requirement; at the same time, it should be noted that the better nitrification of the device is the system. The premise and basis of total nitrogen removal efficiency, therefore, taking necessary structural measures to increase the fluidity of air in the system and strengthening the nitrification function are necessary means to enhance the nitrogen removal capacity of bioretention ponds

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