A rain garden system that protects the bottom denitrification anaerobic zone

Abstract

The invention discloses a rainwater garden system capable of a protecting bottom denitrification anaerobic zone. The rainwater garden system comprises a front tank, the front tank comprises a settlement zone and a transition zone, a sludge pump is arranged at the bottom of the settlement zone and connected with a pressure sludge pipeline, the settlement zone is connected with the transition zone through a filter material zone, the transition zone is connected with a rainwater retention zone through a front tank discharge pipe, a first water storage zone, a soil layer, a gravel layer and a composite reverse osmosis layer are sequentially arranged in the rainwater retention zone, a collector pipe is arranged in the gravel layer, an external tank body is arranged outside the rainwater retention zone and provided with a second water storage zone, and the first water storage zone is provided with a fourth overflow pipe. Rainwater enters the external tank body through the fourth overflow pipe, and a second overflow pipe is arranged on the external tank body and used for discharging overflowing rainwater into a municipal sewage pipe network. The rainwater garden system is reasonable in structure, surface runoff rainwater in a housing estate can be collected and deep treated, flood detention effects can be improved, and runoff rainwater pollution control can be reinforced.

Description

technical field [0001] The invention relates to a rain garden system capable of protecting a bottom denitrification anaerobic zone, belonging to the field of urban ecology. Background technique [0002] In recent years, my country's environmental problems have received more and more attention. The construction of ecological civilization has also become an important program for the construction of new urban areas and residential areas in my country. The urban waterlogging problem has seriously affected the normal life and travel of our residents, and has laid a serious hidden danger for the lives and property safety of the people. 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. [0003] In the construction of new urban areas, the collection and advanced treatment of runoff rainwater is particularly important, and in the rain garden system, the key facil...

AI Technical Summary

Problems solved by technology

For traditional bioretention tanks, due to the large amount of pore water evaporation at the bottom of the traditional retention tank under long-term drought, the anaerobic environment at the bottom has been destroyed, and denitrification has been inhibited. After that, an improved process has been developed—— —The submerged area is set in the bottom water collection pipe, so that the problem has been solved in stages, but the submerged area can only exist during the rainwater infiltration process of a single rainfall. In a static state, a large amount of water will also evaporate under long-term drought, and the anaerobic environment at the bottom cannot be maintained for a long time, which will reduce the decontamination effect of the detention pond

[0004] For example, the patent (application number: 201420025661.5): a bioretention pond that enhances the nitrogen removal effect in storm runoff. Ensure the continuous water outlet of the water collection pipe, so that there will be a dead water area at the bottom, which will affect the water quality of the next rainfall.

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