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A bioretention tank structure with nitrogen and phosphorus removal functions and its preparation method

A technology for bioretention ponds and denitrification and phosphorus removal is applied in the field of water conservancy and municipal environmental protection engineering, which can solve problems such as difficulty in popularization and unfavorable rainwater drainage, and achieve the effects of efficient removal, good urban water environment and ecological functions, and effective utilization.

Active Publication Date: 2019-09-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not conducive to the drainage of rainwater on the road surface, and often forms road ponding. At the same time, it is difficult to promote because of its special requirements.

Method used

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  • A bioretention tank structure with nitrogen and phosphorus removal functions and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Excavate the soil at a certain depth, and lay a layer of pebbles on the bottom layer as a supporting layer. The particle size is 2-4mm; the pebble bottom layer is connected with the urban rainwater drainage system;

[0025] (2) Lay a mixed packing layer made up of coarse quartz sand or gravel and iron filings on the gravel, with a height of 20cm, wherein the weight of iron filings is 10% of the weight of the entire packing layer; the particle diameter of the quartz sand or gravel is 1-2 mm, and the particle size of the iron filings is 1-2 mm;

[0026] (3) laying a height of 30cm ecological structure layer on the mixed filler layer, the ecological structure layer is divided into surface layer and lower layer from the surface to the bottom, and the surface layer contains 90% agricultural and forestry wastes by volume The prepared biomass particles, the rest is soil, the thickness is 10cm, the particle size of biomass particles is 0.5-1.0cm; the lower layer is made of...

Embodiment 2

[0030] (1) Excavate the soil at a certain depth, and lay a layer of pebbles on the bottom layer as a supporting layer. The particle size is 2-4mm; the pebble bottom layer is connected with the urban rainwater drainage system;

[0031] (2) Lay a mixed packing layer made up of coarse quartz sand or gravel and iron filings on the gravel, with a height of 40cm, wherein the weight of iron filings is 2% of the weight of the entire packing layer; the particle diameter of the quartz sand or gravel is 1-2 mm, and the particle size of the iron filings is 1-2 mm;

[0032] (3) laying a height of 70cm ecological structure layer on the mixed packing layer, the ecological structure layer is divided into surface layer and lower layer from the surface to the bottom, and the surface layer contains 80% agricultural and forestry wastes by volume The produced biomass particles, the rest is soil, its thickness is 20cm, and the particle size of biomass particles is 0.5-1.0cm; the lower layer is mad...

Embodiment 3

[0036] (1) Excavate the soil at a certain depth, and lay a layer of pebbles on the bottom layer as a supporting layer. The particle size is 2-4mm; the pebble bottom layer is connected with the urban rainwater drainage system;

[0037] (2) Lay a mixed packing layer made up of coarse quartz sand or gravel and iron filings on the gravel, with a height of 30cm, wherein the weight of iron filings is 3% of the weight of the entire packing layer; the particle diameter of the quartz sand or gravel is 1-2 mm, and the particle size of the iron filings is 1-2 mm;

[0038] (3) laying a height of 60cm ecological structure layer on the mixed packing layer, the ecological structure layer is divided into the surface layer and the lower layer from the surface to the bottom, and the surface layer contains 70% agricultural and forestry wastes The prepared biomass particles, the rest is soil, the thickness is 20cm, and the biomass particle size is 0.5-1.0cm; the lower layer is made of biomass pa...

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Abstract

The invention provides a bioretention pond structure with denitrification and phosphorus removal functions for urban rainwater discharge and its preparation method. The method of the invention includes laying a pebble bottom layer as a supporting layer and laying a layer of gravel on it structure, and then lay a mixed filler layer composed of coarse quartz sand or gravel and iron filings, the height of the mixed filler layer is 20-40cm, and then lay an ecological layer composed of biomass particles and soil made of agricultural and forestry wastes with a height of 30-70cm. structural layer. The bioretention pond structure obtained by the above method can realize efficient interception and removal of nitrogen and phosphorus while ensuring rapid discharge of road surface water, thereby ensuring a good urban water environment and ecological functions. The invention realizes the effective utilization of agricultural and forestry waste; the bioretention pond of the invention is suitable for the construction of various green belts and landscape areas in cities.

Description

technical field [0001] The invention belongs to the technical field of water conservancy, municipal and environmental protection engineering, and in particular relates to a structure of a biological retention pond with the function of denitrification and dephosphorization and a preparation method thereof, which is mainly used in water quality purification treatment of urban rainwater discharge. Background technique [0002] my country is currently in the stage of rapid urbanization development, which has brought enormous pressure and challenges to the urban water environment and caused a series of environmental problems. Urban non-point source pollution refers to the environmental problems caused by rainwater and runoff scouring the urban ground under the condition of precipitation, causing pollutants to enter the receiving water body. Due to the strong human activities in the city and the high proportion of impermeable land area, the rainfall runoff is fierce, the water vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
Inventor 李乃稳刘超李龙国苟思贺宇欣
Owner SICHUAN UNIV
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