A bidirectional seepage bioretention tank capable of maintaining an anaerobic environment at the bottom

Abstract

The invention discloses a bidirectional seepage bioretention pool capable of maintaining an anaerobic environment at the bottom portion. The bidirectional seepage bioretention pool comprises a retention pool main body and an external pool body, wherein a first water storage zone, a grit layer, a gravel layer and a composite reverse osmosis layer are sequentially arranged inside the retention pool main body, a water collection pipe is arranged in the gravel layer, the first water storage zone is provided with a first overflow port and overflows rainwater into the external pool body through the first overflow port, a second water storage zone is arranged inside the external pool body, the retention pool main body is positioned inside the external pool body, the external pool body is provided with a second overflow port, and the second overflow port is communicated to a municipal sewage pipe network. According to the present invention, the bidirectional seepage bioretention pool has the reasonable in structure, can collect the surface runoff rainwater and perform deep treatment on the collected surface runoff rainwater, can improve the flood detention effect of the retention pool, can enhance the control of the runoff rainwater pollution, can be used in the construction of sponge cities in a large-scale manner from the ecological-friendly viewpoint, and has good compatibility.

Description

technical field [0001] The invention relates to a bidirectional seepage biological retention pond capable of maintaining an anaerobic environment at the bottom, and belongs to the field of municipal construction. Background technique [0002] In recent years, China's environmental problems have continued to deteriorate. Due to the extensive use of concrete and asphalt pavements, the impermeability of the ground has increased sharply, resulting in urban waterlogging problems that have seriously affected the normal life and travel of Chinese residents. Property security has laid a serious hidden danger. In order to solve this problem, my country has issued a number of relevant policies and regulations in recent years to vigorously develop the construction of sponge cities. As an integral part of the construction of sponge cities, bioretention ponds have gradually become one of the mainstream technologies and facilities for flood detention and pollution removal in modern urban...

AI Technical Summary

Problems solved by technology

However, due to the high degree of urbanization in China, there are not many available depressions. Therefore, it is necessary to save land resources as much as possible in the implementation of detention ponds, but this will reduce the water storage capacity of the detention ponds and reduce the retention. The flood retention effect of the pond

At the same time, due to the large amount of pore water evaporation at the bottom of the traditional detention tank structure under long-term drought, the anaerobic environment at the bottom was destroyed, and the denitrification was inhibited. After that, an improved process was developed - the bottom water collection pipe was set to be submerged The problem has been solved step by step, but the submerged area can only exist during the rainwater infiltration process of a single rainfall. There will also be a large amount of evaporation of water, and the anaerobic environment at the bottom cannot be maintained for a long time, which will reduce the decontamination effect of the detention tank

[0004] For example, the patent (application number: 201420025661.5): a bioretention pond that enhances the nitrogen removal effect in storm runoff. This patent has a novel idea, but because of the additional combination of a water storage pond and a detention pond, the floor area is significantly increased. At the same time, the reverse filter backflow attachment can only work normally during the seepage process caused by a rainfall. In the subsequent drought state, there will be no rainwater discharged from the outlet pipe, and a stagnant water area will be formed at the bottom, which will affect the processing capacity of the next rainfall.

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