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Method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater

A technology of polycyclic aromatic hydrocarbons and heavy metals, applied in runoff/rainwater treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as soil infiltration, low adsorption saturation point, soil and groundwater pollution, and achieve improved treatment Efficiency, low cost, increased removal effect

Active Publication Date: 2016-04-13
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some studies have pointed out that the low-impact development of rainwater treatment facilities has a certain adsorption and purification effect on heavy metals, but the overall removal capacity for heavy metals is not as good as that of conventional pollutants. The removal rate is between 30% and 80%, and the removal rates of different metals are quite different.
Moreover, the traditional rainwater filtration and sewage interception packing media have limited ability to remove and intercept heavy metal pollutants, and the adsorption saturation point is low and easy to be saturated; when some heavy metals adsorbed and intercepted accumulate to a certain extent, the growth of vegetation will be inhibited, and soil subsidence will occur. seepage, causing pollution risks to soil and groundwater; and the research on PAHs of low-impact development stormwater facilities is rarely reported, and there is a lack of in-depth discussion and research

Method used

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  • Method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater
  • Method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater
  • Method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater

Examples

Experimental program
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Effect test

Embodiment 1

[0081] A method for the synergistic removal of various heavy metals and polycyclic aromatic hydrocarbons in runoff rainwater, the method uses a filler, and the filler includes a layer of zero-valent iron balls.

[0082]The zero-valent iron ball layer is the main removal layer for removing pollutants. Through the adsorption, redox and catalytic reduction of zero-valent iron, most of the heavy metals and polycyclic aromatic hydrocarbons are removed. Zero-valent iron balls can simultaneously remove various heavy metals and polycyclic aromatic hydrocarbons. The setting of the new material layer of zero-valent iron balls actively increases the removal effect of polycyclic aromatic hydrocarbons and heavy metals by using the large specific surface of zero-valent iron balls, and improves the treatment efficiency. It solves the problem that the removal ability of traditional filter materials (natural sand, sandstone, gravel, etc.) to heavy metals is not as good as that of conventional...

Embodiment 2

[0084] A method for the synergistic removal of multiple heavy metals and polycyclic aromatic hydrocarbons in runoff rainwater, the method uses fillers, the fillers include zero-valent iron ball layers, and the fillers also include sand layers, sawdust layers, pumice layers and fine particles. The gravel layer includes the zero-valent iron ball layer, the sand layer, the sawdust layer, the pumice layer and the fine gravel layer in sequence according to the direction in which runoff rainwater enters.

[0085] The thickness ratio of the zero-valent iron ball layer, the sand layer, the sawdust layer, the pumice layer and the fine gravel layer is 1:2.5:1:6:6.

[0086] The filter material of the zero-valent iron ball layer includes zero-valent iron balls, and the diameter of the zero-valent iron balls is 6-10±0.5mm.

[0087] The raw material for preparing the zero-valent iron balls includes nano-zero-valent iron powder, and the diameter of the nano-zero-valent iron powder is 336.6 n...

Embodiment 3

[0107] The difference between this embodiment and embodiment 2 only lies in:

[0108] The thickness ratio of the zero-valent iron ball layer, the sand layer, the sawdust layer, the pumice layer and the fine gravel layer is 1:2:1:5:5.

[0109] The raw material for preparing the zero-valent iron ball includes nano-zero-valent iron powder, and the diameter of the nano-zero-valent iron powder is 336nm.

[0110] The filter material of the sand layer includes zeolite.

[0111] The thickness ratio of the zero-valent iron ball layer to the supporting layer is 1:1.

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Abstract

The invention relates to a method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater. According to the method for synergetically removing the multiple heavy metals and polycyclic aromatic hydrocarbon in the runoff rainwater, filler is adopted and comprises a zero-valent iron ball layer. According to the method, a novel material layer, namely, the zero-valent iron ball layer is arranged, the characteristics of the large specific surface area and the like of zero-valent iron balls are utilized, the zero-valent iron ball layer cooperates with a sand layer, a wood bit layer, a pumice layer and a fine gravel layer, the synergistic effect is achieved, the effect of removing polycyclic aromatic hydrocarbon and the heavy metals is greatly improved, treatment efficiency is improved, and the problems that the removal capacity of traditional filter materials (natural sand, dinas, gravel and the like) for the heavy metals is not as good as the removal capacity for conventional pollutants, and the removal rates of different metal are very different are solved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a method and a device for synergistic removal of various heavy metals and polycyclic aromatic hydrocarbons in runoff rainwater. Background technique [0002] Urban roads have accumulated a large amount of pollutants due to vehicle exhaust emissions, tire and road wear, and oil leakage, mainly including COD, TN, TP, heavy metals, polycyclic aromatic hydrocarbons (PAHs), and nutrients. Due to the high impermeability of urban roads, these pollutants will be dissolved and washed away by the rainwater runoff generated on the road surface during rainfall, and migrate into the water body through the urban drainage network, causing damage to the water quality of the receiving water body. In addition, runoff pollutants will accumulate in the soil with the infiltration of runoff, posing a pollution threat to soil and even groundwater. The current serious runoff pollution poses a challenge to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/28C02F1/72C02F1/70C02F101/20C02F101/32
CPCC02F1/001C02F1/281C02F1/705C02F1/72C02F2101/20C02F2101/327C02F2103/001
Inventor 李海燕格屿张晓然
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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