CN101618897B - A method for treating road surface runoff pollution - Google Patents

Abstract

The invention discloses a method for treating road surface runoff contamination, which comprises the following steps of: throwing at least two layers of granular vermiculite with a grain diameter of between 15 and 40mm into side ditches or evaporation ponds or infiltration ponds on two sides of the road to carry out the adsorption type purification and contamination drainage treatment to the contaminants such as suspended matters, ammonia nitrogen and heavy metal ions which gather in the road surface runoff and settle into the side ditches or evaporation ponds or infiltration ponds so as to remove the road surface runoff contamination. The absorption and purification effects of the vermiculite layers used for absorbing and purifying the rainwater in the road surface runoff are obviously better than those of other absorbents such as active carbon. The on-site test result shows that the method has a good effect and is simple in construction method, low in vermiculite cost and wide in application range.

Description

A method for treating road surface runoff pollution

technical field

The invention belongs to the technical field of environmental engineering, and in particular relates to a method suitable for eliminating and treating road (earth) surface runoff pollution and damage to the surrounding environment on expressways.

Background technique

At present, the methods to deal with surface runoff pollution of expressway mainly include vegetation control, detention pond, soil infiltration and purification system sewage discharge and wetland system sewage discharge, etc. These methods have played a certain role in the process of dealing with surface runoff pollution of expressways. But as time goes by, the pollutants that appear in surface runoff also accumulate day by day, gradually forming pollution. This problem was soon exposed, and its seriousness is likely to be the pollution to the surrounding environment. Especially the drainage system on both sides of the road, if it is not properly filtered, it is likely to pollute the ground water.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for treating road surface runoff pollution in view of the deficiencies in the prior art. Using this method, the road surface runoff rainwater can be collected in the side ditches, evaporation ponds and infiltration pools of the road. The bottom of the pond, after decontamination treatment, infiltrates into the shallow underground permeable soil layer, and the surface runoff of the road is treated through filtration and soil self-purification, and the groundwater is replenished, thereby obtaining good social, economic and environmental benefits.

The technical solution of the present invention is that the method for treating road surface runoff pollution uses the good purification and decontamination capabilities of vermiculite to achieve the purpose of purifying and treating road surface runoff pollutants. That is, place at least two layers of granular vermiculite with a particle size of ￠15-40mm in the side ditch, evaporation pond, and infiltration pond on both sides of the road, and use the placed vermiculite layer to collect the surface runoff and sink into the above-mentioned side ditch or Suspended solids, ammonia nitrogen, and heavy metal ions in evaporation ponds or infiltration ponds are subjected to adsorption purification and sewage treatment, so as to eliminate road surface runoff pollution.

The beneficial effects of the present invention are:

1. The vermiculite layer has obvious adsorption and purification effect on the suspended matter, ammonia nitrogen and heavy metal ions contained in the road surface runoff. Using the vermiculite layer to absorb and purify the road surface runoff rainwater, its adsorption and purification effect is obviously better than that of activated carbon and other Adsorbent. The experiment of vermiculite treatment in the drainage system and surface runoff collection and recharge system of Hebei Hengshui to Daming section of Daguang Expressway, the field test results prove that the effect is good;

2. The construction method is simple, the cost of vermiculite is low, and it can be used in a wide range of fields.

Description of drawings:

Fig. 1 is the reference diagram of the use state of the present invention implemented in side ditch or evaporation pond;

Fig. 2 is the reference diagram of the use state of the present invention implemented in the osmotic tank;

Fig. 3 is a schematic structural diagram of a barrier used in the present invention.

The labels in Figures 1 to 3 above are:

1- trench or evaporation pond,

2- Vermiculite,

3- Osmosis tank,

4- Barrier.

Detailed ways:

Embodiment 1, referring to Fig. 1, this embodiment of the present invention is to lay two layers of granular vermiculite 2 at the bottom of the ditches 1 of the side ditch on both sides of the expressway or the evaporation pond, and the particle size of the vermiculite 2 is ￠15mm, when the road surface After the surface runoff infiltrates and gathers, it flows and infiltrates in the ditch. The vermiculite layer composed of vermiculite 2 carries out adsorption purification treatment on the surface runoff of the road, and removes suspended solids, ammonia nitrogen, and heavy metal ions that sink into the above-mentioned side ditch or evaporation pool. A class of pollutants.

Embodiment 2, referring to Fig. 2, this embodiment of the present invention is that a common commercially available well-shaped grille 4 is set in the permeation tank 3 on the side of the expressway, and then in the grille 4, drop into granular vermiculite 2, vermiculite 2. The particle size is ￠40mm. When the surface runoff of the road surface is collected in the infiltration tank through the ditch, the vermiculite layer composed of vermiculite 2 will carry out the adsorption purification treatment on the surface runoff as in Example 1.

The method for treating road surface runoff pollution of the present invention has been tested in many places in the section from Hengshui to Daming in Hebei, China's Daguang Expressway, and it has been proved that the effect is good, fully meeting the design requirements, and the net sewage discharge rate is as high as 95%.

Claims (1)

1. the method for a treating road surface runoff contamination, this method is to drop at least two layers of particulate state vermiculite that particle diameter is ￠ 15～40mm in road both sides gutter or evaporation tank or seepage basin, utilize input vermiculite layers that road is come together in rainwash and sink to above-mentioned gutter or evaporation tank or seepage basin in suspended substance, ammonia nitrogen, heavy metal ion one pollutant carry out the adsorption cleaning blowdown and handle, to realize the eliminating of road road table runoff pollution.

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