Rainwater garden capable of intensifying nitrogen and phosphorus removal

Abstract

The invention relates to a rainwater garden capable of intensifying nitrogen and phosphorus removal. The rainwater garden comprises a foundation pit and a water collecting pool, wherein a foundation pit gravel layer, a foundation pit zeolite layer, a foundation pit planting layer and a foundation pit organic matter layer are sequentially arranged in the foundation pit from bottom to top; a gap isreserved between the top face of the foundation pit organic matter layer and a top pit opening of the foundation pit to form a water storage space; aquatic herbaceous plants or gramineous plants are planted in the foundation pit planting layer; earthworms are inoculated in the foundation pit; a water collecting pool gravel layer, a water collecting pool zeolite layer and a water collecting pool organic matter layer are sequentially arranged in the water collecting pool from bottom to top; the water collecting pool zeolite layer is communicated with the foundation pit gravel layer through a pipeline; the bottom of the water collecting pool gravel layer is communicated with a drainage pipe. Rainwater is collected through the water storage space and subjected to nitrogen and phosphorus removal through plant absorption and nitration reaction in the foundation pit; the rainwater subjected to nitrogen and phosphorus removal is subjected to denitrification reaction in the water collecting pool to enhance nitrogen removal; the removal effect of pollutants such as nitrogen and phosphorus in the rainwater subjected to multi-stage purification treatment is good, nitrogen and phosphorus removal is thorough, and the treated rainwater can be directly recycled.

Description

technical field [0001] The invention relates to a rain garden, in particular to a rain garden for strengthening nitrogen and phosphorus removal. Background technique [0002] A rain garden is a naturally formed or man-made shallow concave green space, usually including a gravel layer, a planting layer, and an aquifer to collect and absorb rainwater from the roof or the ground. In the existing rain garden design, there are the following problems: 1. The gravel layer is easily blocked, resulting in a decrease in water storage capacity; 2. The water content of the planting layer is easily oversaturated, resulting in affected plant growth and prone to rotten roots; 3. , The ability to reduce nitrogen, phosphorus and heavy metals in rainwater is limited, and the effluent cannot be directly used, and secondary treatment is required. Contents of the invention [0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a rain garden ...

AI Technical Summary

Problems solved by technology

In the existing rain garden design, there are the following problems: 1. The gravel layer is easily blocked, resulting in a decrease in water storage capacity; 2. The water content of the planting layer is easily oversaturated, resulting in affected plant growth and prone to rotten roots; 3. , The ability to reduce nitrogen, phosphorus and heavy metals in rainwater is limited, and the effluent cannot be directly used, and secondary treatment is required

Images