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Bioretention composite media filler, preparation method thereof, and bioretention facility

A composite medium, bioretention technology, applied in chemical instruments and methods, biological water/sewage treatment, granular microbial carrier treatment, etc., can solve the problem that the removal rate of pollutants is greatly affected by seasons and changes in water quality and water quality, and the cost of fillers is high. , large area and other problems, to achieve strong selective ion exchange capacity, good water absorption and water retention, and improve the effect of water retention

Active Publication Date: 2022-03-15
CHINA MACHINERY INT ENG DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a bioretention composite medium filler and its preparation method, and bioretention facilities to solve the problem that the existing bioretention facilities generally occupy a large area, are difficult to implement, and the removal rate of pollutants is affected by seasons and changes in water quality and water quality. The impact is relatively large, the treatment effect is unstable, it cannot adapt to the characteristics of the initial rainwater change, and the cost of the filler used is high, so it is impossible to realize the technical problems of popularization and application

Method used

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  • Bioretention composite media filler, preparation method thereof, and bioretention facility
  • Bioretention composite media filler, preparation method thereof, and bioretention facility
  • Bioretention composite media filler, preparation method thereof, and bioretention facility

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preparation example Construction

[0043] According to another aspect of the present invention, there is also provided a method for preparing a bioretention composite media filler, comprising the following steps:

[0044] S1: Spread out the sludge dehydrated to 60% in the water supply plant and dry it in the sun, turn it once a day, and turn it continuously for 5 to 7 days;

[0045] S2: Pulverize and sieve the water supply plant sludge dried in step S1 to obtain water supply plant sludge particles;

[0046] S3: Soak the coconut bran that has been removed from the coconut shell in water, drain the remaining water when the volume expands to 3 to 4 times, then rinse the coconut bran while draining, repeatedly wash at least 3 times to remove the salt, and dry;

[0047] S4: Stir and mix the sludge particles from the water supply plant obtained in step S2 and the coconut peat obtained in step S3 with coarse sand, fine sand, and planting soil to obtain a bioretention composite medium filler.

[0048] The preparation ...

Embodiment 1

[0063] Bioretention composite media filler, including the following mass percentages: 5% of sludge from water supply plant, 54% of coarse sand, 13.5% of fine sand, 22.5% of planting soil, 5% of coconut peat, and the initial infiltration rate of bioretention composite media filler is ≥4.2 ×10 -5 m / s, stable infiltration rate ≥ 2.2×10 -5 m / s, pH is 6.3, organic matter loss on ignition (LOI) is 3.2%, coarse sand average particle size is 0.8mm, fineness modulus is 3.5; fine sand average particle size is 0.3mm, fineness modulus is 2 ;Permeability of planting soil >3.5×10 -6 m / s, organic content > 5%, pH value 7.1, cation exchange capacity > 5mep / 100g; coconut bran pH value 5.5, coconut bran EC value (conductivity) 0.6.

[0064] A method for preparing a bioretention composite media filler, comprising the following steps:

[0065] S1: Spread the sludge dehydrated to 60% from the water supply plant to form a 20cm thick mud layer and dry it in the sun. Use a soil tiller to turn the ...

Embodiment 2

[0071] Bioretention composite media filler, including the following mass percentages: 5% of sludge from water supply plant, 54% of coarse sand, 13.5% of fine sand, 22.5% of planting soil, 5% of coconut peat, and the initial infiltration rate of bioretention composite media filler is ≥4.2 ×10 -5 m / s, stable infiltration rate ≥ 2.2×10 -5 m / s, pH is 6.3, organic matter loss on ignition (LOI) is 3.2%, coarse sand average particle size is 0.8mm, fineness modulus is 3.5; fine sand average particle size is 0.3mm, fineness modulus is 2 ;Permeability of planting soil >3.5×10 -6 m / s, organic matter content > 5%, pH value 7.1, cation exchange capacity > 5mep / 100g; coconut bran pH value 6, coconut bran EC value (conductivity) is 0.75.

[0072] The preparation method of the bioretention composite media filler is the same as that in Example 1.

[0073] The bioretention facility is the same as in Example 1.

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Abstract

The invention discloses a bioretention composite medium filler, a preparation method thereof, and a bioretention facility, comprising: 3% to 10% of sludge from a water supply plant, 50% to 60% of coarse sand, 10% to 15% of fine sand, and planting soil 20%~25%, coconut peat 2%~8%; or, zeolite 3%~10%, coarse sand 50%~60%, fine sand 10%~15%, planting soil 20%~25%, coconut peat 2% %~8%. In the bioretention composite media filler of the present invention, each component is made of cheap raw materials, mixed according to the proportion, with coarse sand as the main skeleton, fine sand as the polymer, planting soil as the organic matter sustainer for plant and microbial growth, and coconut bran as the main body. Build various components for the bridge to form a good environment for the growth of plants and microorganisms, and use sludge from water supply plants or zeolite to strengthen the removal of phosphorus or ammonia nitrogen. The bioretention composite media filler has good permeability, stable filtration performance, good adsorption capacity, good pollutant treatment effect, and appropriate organic matter content and good water retention are suitable for the growth of plants and microorganisms.

Description

technical field [0001] The invention relates to the field of primary rainwater treatment, in particular to a bioretention composite medium filler. In addition, the present invention also relates to a preparation method and a bioretention facility including the above-mentioned bioretention composite media filler. Background technique [0002] With the effective control of point source pollution, the problem of non-point source pollution caused by initial rainwater has attracted more and more attention. The concept of using low-impact development techniques to treat stormwater is increasingly accepted by people. At present, the non-point source pollution control methods of initial rainwater can be roughly divided into three categories: source control, process control and terminal control. The commonly used control measures mainly include bioretention facilities, overflow storage tanks, and constructed wetlands. The concentrated release location of the initial rainwater pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00C02F3/32C02F3/34
CPCC02F3/00C02F3/32C02F3/34C02F2003/001
Inventor 贺卫宁马晶伟陆先镭林潇石勇施周陈蕃蓝翔
Owner CHINA MACHINERY INT ENG DESIGN & RES INST
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