Municipal rainfall runoff water quality stage purification method and system

A technology for urban rainfall and purification systems, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as low efficiency, single purification function, and low recycling rate , to achieve the effects of short time consumption, high adsorption and degradation performance, and reduced pollutant concentration

Inactive Publication Date: 2012-07-18
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing urban runoff pollution treatment system, such as low efficiency, single purification function, and low recycling rate, and introduce a runoff water quality graded purification landscape system, which can simultaneously meet urban surface runoff water circulation, irrigation water demand, drinking water, etc. Multiple water needs such as water demand and groundwater supplement, and integrated into urban landscape elements to beautify the urban landscape, to improve the total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) in the runoff of the rainfall runoff treatment system , particulate suspended solids (TSS) purification efficiency and utilization, reducing storm runoff flood peaks and beautifying the multifunctional use of urban landscapes

Method used

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  • Municipal rainfall runoff water quality stage purification method and system

Examples

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Effect test

Embodiment 1

[0016] Artificial rainfall is used to simulate the average level of surface runoff water quality in Beijing under natural rainfall (TN: 5-15mg / L; TP: 0.7-1.5mg / L; COD: 100-300mg / L; TSS: 300-500mg / L) . The test vegetation is turf (Tall fescue Festuca arundinacea), and water sampling ports are set at the bottom of the four kinds of fillers, namely, stone, coarse sand, fine sand and soil layers. The thickness of the stone layer of the test filler is 15cm, the thickness of the coarse sand layer is 10cm, the thickness of the fine sand layer is 5cm, and the thickness of the soil layer is 30cm. The rainfall simulated in the experiment is 0.15-10L / min, and samples are taken every 20-40 minutes. The sampling frequency is increased in the early stage of runoff, and the sampling time is gradually extended as the runoff stabilizes. Chemical oxygen demand: dichromate method (GB / T 11914-89); total nitrogen: alkaline potassium persulfate digestion UV spectrophotometry (GB / T 11894-89); total...

Embodiment 2

[0019] Using the same research method as in Example 1, the test vegetation was the shrub Buxus Buxus microphylla. The results of the study found that the total removal rate of TN by planting turf graded water quality purification landscape system was 35.20±29.36%, the total removal rate of TP was 74.30±7.99%, the total removal rate of COD was 64.13±13.33%, and the total removal rate of TSS The total reduction rate of runoff is 32.81±10.06%, the peak total reduction rate is 29.13±11.37%, and the peak delay time is 26±2min. The removal rate of TN in the primary runoff treatment was 15.15±13.38%, the removal rate of TP was 48.45±6.15%, the total removal rate of COD was 40.34±17.29%, and the removal rate of TSS was greater than 90%; the removal rate of TN in the secondary runoff treatment was 18.42% ±22.8%, the removal rate of TP is 54.42±6.72%, the removal rate of COD is 50.17±7.35%, the removal rate of TSS is more than 95%; 60.33±9.12%, the removal rate of COD is 54.45±10.23%, ...

Embodiment 3

[0021]Using the same research method as in Example 1, the test vegetation is the shrub Buxus microphylla (Buxus Buxus microphylla) and turf (Tall fescue Festucaarundinacea), and the mixed planting method is adopted. The results of the study found that the total removal rate of TN by planting turf graded water quality purification landscape system was 39.72±15.46%, the total removal rate of TP was 82.17±6.52%, the total removal rate of COD was 66.28±12.41%, and the total removal rate of TSS The total reduction rate of runoff is 38.78±12.11%, the peak total reduction rate is 33.15±12.17%, and the peak delay time is 31±2min. The removal rate of TN in the primary runoff treatment was 16.15±12.21%, the removal rate of TP was 52.36±7.3415%, the total removal rate of COD was 43.25±13.43%, and the removal rate of TSS was greater than 90%; the removal rate of TN in the secondary runoff treatment was 17.44% ±21.42%, the removal rate of TP is 53.42±8.23%, the removal rate of COD is 47.33...

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Abstract

The invention relates to a municipal rainfall runoff water quality stage purification method. Natural rainfall runoff is subjected to stage purification treatment, including primary vegetation cover treatment and secondary inverted filter treatment. The vegetation cover treatment uses turf and/or frutex boxwood lobules as the vegetation cover; and the inverted filter is filled with fillers, sequentially including sandstone, coarse sand, fine sand and an in-situ soil layer from top to bottom. The layered filler method designed by the invention combines the vegetation cover adsorption to maximally treat and utilize the municipal rainfall runoff, and meanwhile, satisfies the landscape ecological afforestation. The water body treated by the inverted filter with different fillers can satisfy the requirement for different water quality demands. The rainfall runoff is treated by the water quality stage purification landscape system to achieve the effects of reduced runoff speed, decreased granular suspended substance (TSS) and lower concentrations of total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD) and other pollutants.

Description

technical field [0001] The invention relates to the application field of urban non-point source pollution control and water quality purification treatment engineering technology, especially relates to the method of combining vegetation and engineering measures to treat urban runoff pollution in stages under the condition of urban natural rainfall to meet different water quality discharge requirements and urban landscape Water purification methods and ecological landscape systems with complex functions are required. Background technique [0002] The rapid development of urbanization has led to a sharp increase in the proportion of urban impermeable areas, resulting in a large amount of runoff in rainy days, especially in heavy rains, which can only be discharged to receiving water bodies through pipelines. Due to the wide range of sources and types of pollutants carried in runoff , the impact of urban rainfall runoff pollution on the water environment is highlighted, and it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 夏军刘恩民高扬王红萍潘国燕张永勇
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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