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

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 ...

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

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