KR20030066574A - Non-point source a contaminant purification system of first rain - Google Patents

Abstract

PURPOSE: Provided is an incipient rainfall overflow purification system for eliminating non-point source contaminant from incipient rainfall overflow to prevent pollution of river, lakes, and ground water. CONSTITUTION: The system comprises a trench formed by excavation and connected to a drainage canal, a filter layer(52,54,56,60) deposited on the trench and plants(10) planted in the filter layer for guiding incipient rainfall overflow to ground water after purifying the incipient rainfall overflow containing non-point source contaminant, and the drainage canal(30) for discharging purified incipient rainfall overflow to public water.

Description

Non-point source a contaminant purification system of first rain}

The present invention relates to a technique for purifying nonpoint pollutants in the initial excellent runoff during rainfall, and more specifically, the discharge area is reduced from a wide range of nonpoint pollutants to reduce the concentration of nonpoint pollutants contained in the initial rainfall runoff during the rainfall. The present invention relates to a non-point pollutant purification device for initial excellent runoff water that can be discharged to water.

In general, pollutants include point pollutants and agricultural lands, grasslands, forest lands, construction sites, mines, logging sites, waste disposal plants, garbage, etc., which are discharged from defined and limited point sources such as domestic sewage, industrial wastes, and livestock wastes. Discharge areas such as landfills, urban areas, roads and industrial sites can be divided into nonpoint pollutants emitted from a wide range of nonpoint sources.

Contaminants emitted from the pollutant as described above are distributed in a variety of forms such as heavy metals, pathogenic microorganisms, organic compounds, radioactive materials, toxic substances and other salts. These pollutants are usually swept away by rainwater and flow into public waters such as rivers, bays, lakes, and lakes, causing water pollution, and eventually destroying ecosystems. It is very damaging.

On the other hand, in the case of point pollutants having a clear discharge point among the pollutants as described above, a separate purification device or wastewater treatment facility is installed in a home, factory, or livestock farm, but the pollutant is purified to some extent. In case of pollutants, the discharge area is not only extensive but mostly remains on the surface of the earth, and it is the main cause of water pollution as it enters public waters or groundwater such as rivers, bays and lakes with rainwater during rainfall.

In particular, in the case of nonpoint pollutants, as described above, the rainwater that falls during the rain, especially during the initial rain, flows into public waters or groundwater such as rivers, bays, and lakes. Above all, it is important not to let it flow into public waters or groundwater without purification.

As mentioned above, non-point pollutants in the pollutants are caused by flooding in the quantitative aspect of Korea and water quality deterioration in public waters due to non-point pollutant outflow during rainfall. In particular, in urban areas, as the impermeable pavement ratio increases, the peak runoff during rainfall increases, and thus the mobility of non-point pollutants increases, requiring management in terms of water quality and quantity.

In addition, the non-point source described above refers to a source of pollution caused by non-fixed sources such as factories and household sewage as a relative concept of the point source, and usually collects pollutants that flow out as rainwater during rainfall. These nonpoint sources account for 22-37% of the pollutant loads of the four rivers, and in the case of Paldang Water, 44.5% of the pollutant loads are irradiated as nonpoint sources.

On the other hand, the pollutant outflow characteristics in the stormwater runoff show relatively high pollution concentrations in the initial stormwater runoff, so that only 80% of the rainfall can be treated with the stormwater treatment facility capacity for about 20mm of rainfall. It is becoming.

Therefore, it is difficult to install rainwater treatment facilities requiring large land area due to the difficulty of land acceptance in the existing urban areas. In order to use the device-type facilities such as the rainwater pumping station and the construction of a new city, in order to prevent the drastic change in the hydrologic discharge characteristics due to the increase in the impermeability rate of the area, the ratio of the impermeability rate of the city to a certain level or the excellent before and after development Compared with changes in runoff, if there is more runoff than before development, it is recommended to install infiltration and storage facilities to control the runoff, and the waterside area is an area that can directly affect river water quality when planning land use in urban areas. Restrain water and damage, It has been reported to use a buffer zone for reducing salt substances.

In addition to the rapid introduction of storm water runoff treatment facilities as described above, periodical city cleaning, inspection and cleaning of manholes and storm drainage facilities before the rainy season, dredging of sediment at the bottom of the reservoir, installation of storm drains in construction areas, etc. The plan to remove various nonpoint sources scattered in urban areas is also under consideration.

However, despite the various measures to treat the initial excellent runoff as described above, it is actually difficult because there are too many limiting factors such as difficulties due to land acceptance.

The present invention was devised to solve the problems described above, and cleans the non-point pollutants introduced with rainwater during rain, especially during early rain, through various steps, such as rivers, bays, lakes, public waters, groundwater, etc. Its purpose is to provide an excellent non-point pollutant purification device that can prevent water pollution.

Furthermore, the present invention purifies the non-point pollutants contained in the initial excellent rainfall during rain and sends them to public waters or groundwater to protect the natural ecosystem through prevention of water pollution caused by non-point pollutants, as well as the final To reduce the harm to the human being as a consumer.

1 is a cross-sectional view of the initial excellent runoff water non-point pollutant purification system according to the present invention.

Figure 2 is a cross-sectional view showing another embodiment of the initial excellent effluent non-point pollutant purification system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: plant 20: soil

30: drainage channel 32: drainage hole

40: road 52: first media layer

54: second media layer 56: third media layer

58: plant 60: fourth media layer

The present invention configured to achieve the above object is as follows. In other words, the present invention is a filter layer which is expelled in the direction flowing into the drain hole to clean the initial rainwater containing non-point pollutants with plants planted and coated in the cavity, cavity in which rainwater is introduced from the soil, and then guided to groundwater. , And drainage that is installed on the side of the cavity and contains rainwater that does not contain nonpoint pollutants from the cavity and flows through the drain hole to discharge into public waters. Purified through layers and plants, discharged into groundwater, and rainwater that does not contain nonpoint pollutants overflowing from the bottom of the cavity through continuous rainfall is introduced into the drain through the drain hole.

In the configuration as described above, the media layer is characterized in that the sand, soil, gravel, crushed stone, artificial media, nonwoven fabric alone or mixed.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

For reference, the specification of the present invention distinguishes the rainwater containing a relatively small amount of non-point pollutants or the non-point pollutants compared to the initial rains due to the initial rain and the continuous rain containing a large amount of non-point pollutants.

1 is a cross-sectional view of an initial excellent runoff non-pollutant purification system according to the present invention.

The technology according to the present invention is to be installed in an area where rainwater flows into the road 40 when rain is inclined toward the road 40 or in an area where rainwater flows down from the road 40 to both sides of the road 40. Although described by way of example, it is widely employed in all regions where there is a need to purify the initial stormwater containing nonpoint pollutants such as organic matter, heavy metals, oils, etc., such as nonpoint pollutants such as roads, parking lots, commercial and industrial areas in large cities. Can be.

The initial excellent effluent non-point pollutant purification system (hereinafter, simply referred to as 'purification treatment system') according to the embodiment of the present invention may be disposed on both sides of the soil 20 and the road 40 on which the land plants 10 are planted. It is installed between the drain holes 32 to be installed, which is to clean the initial rainwater containing a large amount of non-point pollutants contained in the atmosphere or soil 20 during the first rainfall and then discharged into the groundwater. Of course, the purified rainwater is introduced through the inlet hole (30a) of the drainage path 30 is also discharged through the drainage path (30).

This purification treatment system forms a cavity 50 by digging long between the soil 20 and the road 40, and then forms a filter layer for purifying the initial excellent water in the cavity 50.

The filter media layer is formed by sand or soil, gravel, crushed stone, for example, artificial media such as synthetic resin alone or mixed, in the embodiment according to the present invention was applied to the first filter layer 52 with sand, the second media Layer 54 was made of gravel. Further, at the bottom, a nonwoven fabric was applied to the third media layer 56.

That is, as shown in Fig. 1, in the embodiment according to the present invention, sand 52 and gravel 54 are repeatedly applied in order from the top, and a nonwoven fabric 56 is applied to the bottom.

On the other hand, the uppermost first media layer 52 is formed in a concave shape or to a predetermined depth from the ground surface to prevent the initial rainwater flowing from the soil 20 to flow directly into the drain hole 32 and to flow directly into the media layer Form.

The uppermost first layer 52 is planted with various plants 58 having a natural purification function, such as a land plant such as grass, or an aquatic plant or a water plant.

The plant 58 has its stem and root used as an attachment medium for microorganisms, and induces nitrification and denitrification by promoting the degradation activity of the microorganisms by transferring oxygen through the ventilation tissue.

Accordingly, the initial rainwater flowing from the soil 20 is collected in the uppermost first medial layer 52 and permeated downward and filtered. In addition, nonpoint contaminants contained in rainwater are attached to various plants 58 so that they are degraded by microorganisms.

Therefore, the initial rainwater containing a large amount of non-point pollutants during the first rainfall flows down the soil 20 and immediately flows into the purification treatment system for purification. Purified rainwater is also absorbed into the basement of the soil, but is also introduced into the drainage path 30 through the inlet hole 30a of the drainage path 30.

On the other hand, the stormwater runoff caused by continuous rainfall contains less nonpoint pollutants. Rainwater containing less nonpoint pollutants flows directly into the drain hole 32 without passing through the filter bed of the purification treatment system. This is because rainwater continues to flow back from the cavity 50 of the purification treatment system when the rainfall continues, so rainwater does not flow into the purification treatment system. As such, the rainwater flowing straight into the drain hole 32 without being introduced into the purification treatment system is led to the public water through the drainage path 30. Unlike initial rainwater, they do not contain nonpoint contaminants and do not need to be purified separately.

That is, the purification treatment system of the present invention guides the initial excellent water containing non-point pollutants into the cavity 50, purifies through the filter media and the plant 58, and then guides the ground water to the non-point pollutants. Rainwater is not purified, unlike early rainwater. Therefore, the rainwater after the initial rainwater that is purified and flowed into the groundwater is taken up in the cavity 50 as a continuous rainfall and immediately flows into the drainage path 30.

Figure 2 is a cross-sectional view showing another embodiment of the initial excellent effluent non-point pollutant purification system according to the present invention.

FIG. 2 is an example of using the artificial media as described above, wherein the first media layer 52 is sand, the second media layer 54 is gravel, and the third media layer 56 is a nonwoven fabric. (60) used artificial media.

As artificial media, synthetic resins of plastics were used. That is, the embodiment according to the present invention easily employs gravel, sand, soil, crushed stone, artificial media, etc. as necessary. The selection and size of such a median layer can be carried out in various ways in consideration of the size of the cavity 50 and the area of rainfall and rainwater inflow of the rainwater.

In other words, the purification treatment system according to the present invention intensively purifies the initial excellent water containing a large amount of non-point pollutants in the soil 20 and the air, the less excellent than the initial excellent non-point pollutants due to the backflow in the soil Naturally, it is discharged to public waters, and in the early stage of rainfall, the initial rainfall flows directly into the media layer inside the cavity 50, but if the rainfall continues, rainwater flows backward from the soil 20 under the cavity 50 and the interior of the media layer. This is because subsequent rainwater is discharged directly into public waters.

As a result, the initial rainwater containing a large amount of nonpoint pollutants is naturally purified by the filter media and plants, but the rainwater that does not contain the nonpoint pollutants is discharged directly into the public water through the drainage channel 30, unlike the initial rainwater.

The present invention is not limited to the above-described embodiments and can be carried out in various modifications within the scope of the technical idea of the present invention.

According to the present invention configured as described above, it is possible to prevent water pollution of public waters such as rivers, bays and lakes, groundwater, etc. by purifying non-point pollutants introduced with rainwater during rain, especially during rain, during various stages. .

In addition, by purifying nonpoint pollutants contained in early rainwater during rainfall, they can be sent to public waters or groundwater to protect natural ecosystems by preventing water pollution caused by nonpoint pollutants. The damage can be reduced more.

Claims (2)

A cavity in which the rainwater is introduced from the soil by being dug in the direction flowing into the drain hole; Median layer which purifies the initial rainwater containing non-point pollutants with plants planted and applied to the cavity and leads to groundwater; And It is installed on the side of the cavity and comprises a drainage that does not contain the non-point pollutant introduced from the cavity flows through the drain hole to discharge into the public water, The initial rainwater containing the nonpoint pollutants at the beginning of the rainfall is purified through the filter bed and the plant and discharged into the groundwater, and the continuous rainfall does not contain the nonpoint pollutants that have flowed back from below the cavity and overflow the cavity. Rainwater is the initial excellent outflow water non-point pollutant purification system, characterized in that the drainage flows into the drain through the drain hole. The system of claim 1, wherein the media layer comprises sand, soil, gravel, crushed stone, artificial media, or nonwoven fabric alone or mixed.