Bioretention pond filter layer filler and processing method

A bioretention tank and filter layer technology, applied in chemical instruments and methods, biological water/sewage treatment, drainage structures, etc., can solve the problems of small permeability coefficient, soil compaction, large fluctuation range, etc. The effect of small coefficient and stable structure

Active Publication Date: 2017-08-04
KUNSHAN CONSTRUCT ENG QUALITY TESTING CENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to ensure the growth of plants, the mixing ratio of the filter layer of the existing bioretention tank is mixed with a certain proportion (10-15%) of the original soil, the proportion is relatively large, but the initial permeability coefficient of the filler reaches 800-1000mm/h, which exceeds the design requirements ;The soil in Kunshan area is sticky soil, the permeability coefficient is small, and the soil will compact

Method used

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  • Bioretention pond filter layer filler and processing method
  • Bioretention pond filter layer filler and processing method
  • Bioretention pond filter layer filler and processing method

Examples

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Effect test

Embodiment 1

[0033] A kind of bioretention tank filter layer filler of the present invention comprises the composition of following percentage by weight:

[0034]

[0035] In this embodiment, the sand materials are all Yellow River sand, the fineness modulus of selected coarse sand is 3.702, the fineness modulus of medium sand is 1.887, the fineness modulus of fine sand is 0.625, and the natural organic matter is nutrient soil, which is The pine needles are composted and fermented after crushing, and the mass percentage of organic matter per unit mass is 67%.

[0036] Dry the above-mentioned coarse sand, medium sand, and fine sand to an initial moisture content of 1%, mix them with nutrient soil, and use a mixer to stir them evenly to form fillers. image 3 It is the gradation curve of the raw materials and the mixture of Example 1. The coarse, medium and fine sand used are all continuously graded Yellow River sand, and the gradation of the mixture is close to a straight line, which sho...

Embodiment 2

[0038] A kind of bioretention tank filter layer filler of the present invention comprises the composition of following percentage by weight:

[0039]

[0040] In this embodiment, the sand materials are all Yellow River sand, the fineness modulus of selected coarse sand is 3.702, the fineness modulus of medium sand is 1.887, the fineness modulus of fine sand is 0.625, and the natural organic matter is nutrient soil, which is The leaves are composted and fermented after crushing, and the mass percentage of organic matter per unit mass is 73%.

[0041]The above-mentioned coarse sand, medium sand and fine sand are dried to an initial moisture content of 2% and mixed with nutrient soil, and stirred evenly by a mixer to form a filler.

[0042] Figure 4 It is the gradation curve of the raw material and the mixture of Example 2. The coarse, medium and fine sands used are all continuously graded Yellow River sand, and the gradation of the mixture is close to a straight line, which...

Embodiment 3

[0047] A kind of bioretention tank filter layer filler of the present invention comprises the composition of following percentage by weight:

[0048]

[0049] In this embodiment, the sand materials are all Yellow River sand, the fineness modulus of selected coarse sand is 3.702, the fineness modulus of medium sand is 1.887, the fineness modulus of fine sand is 0.625, and the natural organic matter is nutrient soil, which is The product of pine needle leaves after composting fermentation, the mass percent of organic matter per unit mass is 85%.

[0050] The above-mentioned coarse sand, medium sand, and fine sand are dried to an initial moisture content of 2.5% and then mixed with nutrient soil, and stirred evenly by a mixer to form a filler.

[0051] Figure 5 It is the gradation curve of the raw material and the mixture of Example 3. The coarse, medium and fine sands used are all continuously graded Yellow River sand, and the gradation of the mixture is close to a straight...

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Abstract

The invention discloses a bioretention pond filter layer filler and a processing method. The bioretention pond filter layer filler is prepared from the following raw materials in percentages by weight: 1-2% of a natural organic matter, 45-60% of continuously graded coarse sand, 10-25% of continuously graded medium sand and 25-35% of continuously graded fine sand. By adopting the continuously graded sand, the bioretention pond filter layer filler is more stable than an existing proportion structure layer, the component of original soil is omitted under the premise of ensuring plant growth, and the problem of blockage caused by soil hardening in the operating process of the bioretention pond is solved. Meanwhile, the invention further discloses a factory processing method with the mixture ratio. The raw materials conveyed from a wharf are dried until the moisture content is 1-3% and then stirred evenly, and the initial permeability coefficient also meets the technical requirements. The used raw materials with the ratios are continuously graded, so that the sieving process is omitted, complete drying is not needed in factory production, the procedure is simplified and the cost is reduced.

Description

technical field [0001] The invention relates to the field of sponge city construction, in particular to a filter layer filler of a bioretention pond using localized materials and a processing method thereof. Background technique [0002] The existing bioretention pond technology is mainly a new technology of stormwater management for the continuous development of urbanization, the rapid growth of impervious areas, the pollution of rainwater runoff and the frequent occurrence of urban waterlogging. It is also a new technology for the construction of sponge cities. a key technology. [0003] Commonly used bioretention tank structures such as figure 1 As shown, from top to bottom are retention layer, filter layer, transition layer, water retention layer and drainage layer. The stagnation layer is the regulation and storage volume reserved by the system, which can relieve the flood peak; the filter layer is to remove the pollutants in the rainwater runoff through physical, che...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34E03F5/10E03F5/14
CPCC02F3/32C02F3/34C02F2103/001E03F5/10E03F5/14
Inventor 崔咏军樊绿叶阙振业傅大放杨飞凯
Owner KUNSHAN CONSTRUCT ENG QUALITY TESTING CENT
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