Eco-stagnation and filtration system with nitrogen removal function

Abstract

The invention relates to an eco-stagnation and filtration system with a nitrogen removal function. The eco-stagnation and filtration system mainly comprises a stagnation zone and a filtration zone. The eco-stagnation and filtration system is constructed mainly from a municipal landscaping greenland. Through filling with a percolation matrix and plantation of specific plants, city overland runoff is delayed and is subjected to percolation. When overland runoff is produced on the water impermeable earth surface, initial heavy pollution runoff enters into the stagnation zone, then permeates into the stagnation zone, then is filtered, then permeates into the lower-middle part of the stagnation zone and is momentarily stored in the stagnation zone, and water collection and discharge pipes arranged at the bottom broken stone layer control a water flow amount so that the initial heavy pollution runoff can be retained for a long time and surface runoff NO<3>-N reduction time requirements are satisfied. When the initial surface runoff in the stagnation zone is saturated and overflows a water stagnation layer in the stagnation zone, later surface runoff overflows and enters into the filtration zone, then permeates into the filtration zone, then is filtered, then permeates into the broken stone layer at the bottom of the filtration zone, and then is discharged into a municipal rainwater pipe net by open water collection and discharge pipes in the broken stone layer.

Description

Technical field: [0001] The invention relates to a pollution control technology of urban surface runoff, which mainly uses urban landscape green space to construct an ecological retention filtration system with denitrification function, fills the percolation matrix, and plants specific plants to retain and infiltrate the urban surface runoff. The effect is to prolong the residence time of surface runoff in the system through the setting of the detention area, thereby strengthening the denitrification function of urban surface runoff, and effectively controlling the nitrogen pollution of urban surface runoff. Background technique: [0002] Urban surface runoff is the second largest pollution source that affects the quality of urban water environment, and it is also the second largest non-point source pollution source after agricultural non-point source pollution. With the intensification of the treatment of point sources such as urban industrial wastewater and domestic sewage...

AI Technical Summary

Problems solved by technology

The traditional control technology based on the principle of temporary retention and infiltration, due to the short hydraulic retention time, the denitrification effect is not obvious, usually cannot effectively remove nitrogen in urban surface runoff, and even produce NO 3 -N leaching output, making NO in water 3 The concentration of -N increases

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