KR100791611B1 - Non-powered apparatus for removal of non-point source pollutant originated in highland agriculture - Google Patents

Abstract

A non-powered apparatus for removal of nonpoint source pollutants generated from alpine agricultural areas is provided to remove the nonpoint source pollutants by using the law of gravity of dropping water from a slope of an alpine agricultural land area, and enable the apparatus to be easily applied to the alpine agricultural areas including topography of slopes by making it not necessary to install incidental facilities such as an electrical equipment. A non-powered apparatus for removal of nonpoint source pollutants generated from alpine agricultural areas includes: a water collecting drain(10) for collecting nonpoint source pollutants discharged from the alpine agricultural areas and generated by a rainfall to drain the collected nonpoint source pollutants into treatment facilities; an earth and sand settling pond(20) for removing earth and sand and suspended solids that are contained in storm water, the earth and sand settling pond having the water collecting drain connected to a wall surface thereof adjacent to an alpine agricultural land area, and a first bank(21) formed on an opposite wall surface thereof such that collected influent flows to the slow sand filter by flowing over the first bank; a slow sand filter(30) for removing dissolved matters and fine suspended solids contained in the influent that has been flown over the first band of the earth and sand settling pond, the slow sand filter having a microorganism layer(35), a sand layer(32), a gravel layer(33) and a perforated underdrain(34) sequentially stacked therein and including a second bank(31) formed on an opposite wall surface thereof such that the second bank is lower than the first band; a discharge part(40) for discharging effluent that has passed through the slow sand filter to the outside; and a detour discharge part for enabling an excessive flow amount to make a detour around the slow sand filter. The microorganism layer includes gravels(a) and a bio-film(b) coated on the gravels.

Description

Non-powered apparatus for removal of non-point source pollutant originated in highland agriculture}

      The present invention is to treat the sewage effluent treated by sedimentation sedimentation basin to remove the soil and suspended solids contained in rainwater runoff occurring in the high-land agricultural region, and slow filtration to remove dissolved substances and trace harmful substances The present invention relates to an apparatus for treating nonpoint pollutants occurring in a highland agricultural region, wherein the nonpoint pollutants are treated with no power by applying the principle of gravity in which water drops due to the inclined geographical characteristics of a highland farmland.

       Generally, highland agriculture is highland or mountainous highland. In Korea, the land area of highland agriculture is 51,000 hectares (ha), accounting for 2.7% of the country's agricultural land. Due to the high slope and elevation, these highland agricultural regions have very severe soil runoff due to small rainfall.

       The highland agricultural region of Korea is geographically distributed around Baekdudaegan area, which is still less environmentally damaged than other regions, and has various animal and plant resources and preserves beautiful landscapes unique to forest areas. This area is distributed in the upper parts of Korea's major water systems, such as the Han River and the Nakdong River, so it is also an area requiring special management to prevent pollution of clean water resources.

       The environmental problems associated with high-land agriculture are closely related to nonpoint sources. There are two main types of nonpoint sources: first, land-based pollutants, and second, management-based pollutants. The former is related to the soil and pollution is caused by soil particles entering the water system by soil loss. Lost sediment is a source of contamination. The latter case refers to pollutants applied to crops or soil to improve productivity or control pests, some of which are dissolved in water, move with runoff and runoff, and some are adsorbed to soil particles, resulting in soil loss. Say when to go. Pesticides, fertilizers and livestock manure can be included here.

In order to prevent the inflow of non-point pollutants from the high-land agricultural areas into the water system, the installation of facilities such as buffered vegetation zone, bypass channel, vegetation channel, vegetation field dune, freefall settlement, and stone building is underway. However, all of these projects are facilities to prevent the inflow of soil, and methods for reducing pollutants based on farming management methods such as pesticides, fertilizers and livestock manure have not been solved.

Conventional apparatus for treating non-point source has mainly been the treatment technology by the physical method to remove only soil or sand, such as pollutants with high specific gravity. Such physical treatment technology is extremely low in the removal efficiency of organic matter and nutrients, high cost compared to treatment efficiency, and mainly depends on foreign technology.

On the other hand, a variety of technologies and methods for removing non-point pollutants have been developed to look at the patent registered contents, the non-point source removal apparatus of the Korean Patent No. 443420 (registered on July 27, 2004) and No. 491867 ( The non-point pollutant treatment device of the initial excellent water of the registration of May 19, 2005 and the non-point pollutant purification device of the initial effluent of No. 561092 (registered on March 8, 2006) have been registered. It is a nonpoint pollutant that occurs in urban areas such as roads, factories, and parking lots. Therefore, in order to remove nonpoint pollutants generated under special environmental conditions such as high-land agricultural areas, a unit process for removing a large amount of soil and a unit process for removing dissolved contaminants are required. A device is needed.

The outflow characteristics of non-point pollutants generated in agricultural regions with high temperatures are very different from those of rainfall runoff in urban areas. During rainfall in the high-land agricultural region, as shown in FIG. 1, the outflow of dissolved substances (C) due to fertilization of the soil is concentrated at the initial stage of rainfall, and the dissolved substances (C) contained in a large amount in the initial outflow water are total. As it is a source of eutrophication such as nitrogen and total phosphorus, it is necessary to remove the initial rainfall runoff. However, unlike the outflow characteristics of the dissolved material (C), the outflow characteristics of the soil (S), which occupy a large portion of the pollutants in the highland agricultural region, are largely outflowed after a certain time in the early rainfall, so the outflow characteristics of the rainfall (Q) It is almost similar to. Considering the outflow characteristics of dissolved material (C), soil (S) and rainfall (Q) over time, the installation of a treatment device for efficiently removing contaminants such as soil and dissolved material is urgently needed. It is a required situation.

In order to solve the above problems, the present invention is a soil sedimentation basin for removing soil and suspended matter contained in rainwater runoff occurring in high-land agricultural areas, and microorganisms for removing dissolved and trace harmful substances By treating the rainwater discharged by the slow filtration phase formed on top of the film-formed sand, the non-point pollutants can be treated by non-powerless force based on the principle of gravity that water falls on the slope of the highland farmland. The purpose is to provide a treatment apparatus for non-point pollutants occurring in high-land agricultural areas.

In particular, since the non-point pollutant treatment device of the present invention can be operated by non-powered, it is not necessary to install additional facilities such as electrical equipment, so it is possible to construct small-scale facilities, and it is possible to construct a high-land agricultural region with sloped terrain with a difference in height between the ground and the ground. Another object is to provide a treatment apparatus for non-point pollutants occurring in high-altitude agricultural areas, characterized in that it can be easily applied in.

As such, the present invention was designed to treat particulate matter and dissolved substances in separate unit processes in consideration of non-point pollutant spillage characteristics of high-altitude agricultural areas in the process of treating non-point pollutants in a single rainfall process. Excessive rainfall inflows, such as heavy rains, are designed to bypass the stability of treatment facilities. In addition, it improved the stability of the process as a non-powered device using potential energy according to the slope of the highland agricultural area. The present invention is characterized in that it can achieve the object of the present invention by checking the processing efficiency of each unit process through the embodiment and deriving the operating factors for each processing process.

       The present invention provides a device for removing non-point pollutants occurring in a high cold agricultural region,

A catchment drainage channel for collecting non-point pollutants discharged by rainfall from the highland agricultural region;

A sedimentation sedimentation basin for removing stormwater and sediment;

Slow filter bed to remove dissolved material;

A discharge part for discharging the effluent passing through the slow filter phase to the outside; And

And the excess flow rate bypass bypass for bypassing the slow filter phase;

An apparatus for treating non-point pollutants occurring in a high-altitude agricultural region, characterized in that the configuration as a problem solving means.

In particular, the present invention is to treat the non-point pollutants generated by non-point pollutants generated at the occurrence of rainfall by using the treatment apparatus according to the present invention in a non-polluting manner by the force of gravity to drop water on the inclined surface of the highland farmland, small scale of the device Since it can be operated by non-powered construction, it is a device that can be easily applied in a high-altitude agricultural region consisting of the topography of the slope with the difference in height of the ground.

The present invention eliminates the need for additional facilities such as electrical installations by treating nonpoint pollutants with no force, based on the principle of gravity that water drops on the slopes of highland farmland areas by means of the above-mentioned problem solving means, so that the construction of small-scale facilities is possible. The advantage is that it can be easily applied in high-altitude agricultural areas consisting of the topography of the slope with the difference in the height of the ground.

In addition, the biological treatment method is applied to remove organic substances and nitrogen compounds contained in non-point sources. A gravel layer with a biofilm on top of a slow filter is used to remove dissolved substances in the influent. Excellent, minimizes the burden on the environment by minimizing the generation of secondary pollutants due to biological treatment of pollutants, and the filling rate of the gravel layer with biofilm varies by 5-30% (V / V) depending on the conditions of the installation site It is a technology that can be applied and is a semi-permanent treatment technology that does not require the replacement of the media because the load of contaminants on the media is not minimized.

In addition, the present invention is to treat the non-point pollutants in the initial rainfall runoff in the sewage sewerage area, the treatment of the overflow water in the combined sewage sewage area, the removal of the non-point pollutants introduced from the water supply source or dam upstream, the fire in the workplace, factories, etc. It can be used as a non-point pollution reduction facility that has a combined storage tank function.It is applied to water reuse in golf courses, etc., with the use of non-point pollutants generated in various development projects such as complex development, combined with an excellent storage tank, and excellent treatment efficiency. This is a highly available technology.

According to a feature of the present invention for solving the above problems, the conventional four-way facility was constructed for the purpose of preventing the earth and sand disaster caused by the production and outflow of the soil, while the present invention is the outflow of non-point pollutants in high-land agricultural areas On the basis of the characteristics, it is characterized by the introduction of the conventional four-way facility as a facility of pretreatment step to remove the spilled soil and to remove non-point pollutants.

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

       Figure 2 is a view showing a state of the cross-section of the non-point pollutant treatment apparatus generated in the high-range agricultural region according to the present invention, Figure 3 is a non-point pollutant treatment apparatus generated in the high-range agricultural region according to the present invention. Figure 4 is a view showing a cross-sectional view, Figure 4 is a view showing a cross-sectional view of the slow filter phase of the non-point pollutant treatment apparatus according to the present invention.

In the removal device of non-point pollutants generated in the high-land agricultural region (A),

A catchment drainage passage 10 for collecting non-point pollutants spilled by rainfall from the high-land agricultural region;

A sedimentation sedimentation basin 20 for removing storm sediment and suspended solids;

Slow filter bed 30 for removing dissolved material; And

Discharge part 40 for discharging the outflow water passed through the slow filter phase to the outside; And

And the excess flow rate bypass bypass for bypassing the slow filter phase (50);

An apparatus for treating non-point pollutants occurring in a high-altitude agricultural region, characterized in that the configuration as a problem solving means.

The present invention uses the treatment apparatus according to the present invention to treat the non-point pollutants generated by non-contaminant by the force of gravity in the non-point pollutants generated during rainfall occurs on the slope of the high-land farmland area (A) as a non-powerless process. It will be described in detail as follows.

The catchment drainage channel 10 of the present invention is a facility for easily collecting non-point pollutants generated by agricultural activities in a high-range agricultural region when rainfall occurs in a high-range agricultural region and draining the collected non-point pollutants to a treatment facility that is the next process. to be.

In addition, the arrangement structure of the sump drainage passage 10 includes a surrounding sump drainage path 11 surrounding the outer periphery of the high-altitude farming area in a line form and an inner sump drainage that traverses from the upper part of the slope to the lower part with a predetermined interval in the interior of the high-drainage farming area. It is formed of (12), and the lower end of the internal catchment drainage channel (12) is connected to the lower external catchment drainage (11d) structure, so that the high-range non-point pollutant can be easily introduced into the catchment drainage by the height difference of the slope height Structure.

The surrounding catchment drainage 11 is a form surrounding the highland agricultural region, and the upper peripheral catchment drainage 11a on the slope of the highland agricultural region A and the left and right catchment drainage channels 11b and 11c arranged on both sides of the highland agricultural region. And the lower catchment drainage path (11d) of the slope of the highland agricultural region are connected to each other, and serves to collect not only the nonpoint pollutants inside the highland agricultural region but also the nonpoint pollutants around the outside of the highland agricultural region.

In addition, the internal catchment drainage channel 12 forms a plurality of dogs so as to cross a predetermined interval in the interior of the high-cold farming area so as to cross from the top to the bottom of the inclined surface, and the lower end of the internal catchment drainage is collected around the lower part of the slope of the high-cold farming area. By connecting to the drainage path, the non-point pollutants collected inside the highland agricultural area are collected in the lower peripheral catchment drainage path 11d.

As such, the nonpoint pollutants discharged from the highland agricultural region are characterized by the fact that nonpoint pollutants are collected by the forceless force of gravity due to the high and low difference of the slope of the highland agricultural region.

And the sedimentary sedimentation basin 20 of the present invention is collected through the catchment drainage passage 10 as shown in Figure 3 and then sedimentary flotation, such as earth and sand, sand and the like contained in rainwater runoff when the sedimentary sedimentation basin 20 is introduced into It is a facility with a settling function to sediment materials.

The structure of the soil sedimentation basin 20 according to the present invention has a structure similar to that of a conventional four-way facility, where the catchment drainage passage 10 is connected to the wall surface adjacent to the highland farmland area A, and the inflow water collected on the opposite wall surface thereof. The first bank 21 is formed so as to flow over the slow filter bed 30.

The shape of the soil sedimentation basin 20 in the present invention is not particularly limited, and may take various forms such as square, rectangular, trapezoidal, circular, etc. in consideration of the inclined topography of the highland agricultural region.

And the hydraulic retention time of the inflow water stays in the sedimentation basin of the present invention is 30 minutes to 1 hour, it is preferable that the concrete structure is designed for the stability of the subsequent process. The total soil loss is hydraulically dwelling time, with an allowable limit of 11.0 ton / ha of the OECD, and annually collected soil is reintroduced to agricultural areas. Also, the influent that did not overflow in the soil removal device was able to supply to the highland agricultural area as water storage.

The slow filter bed 30 of the present invention is a facility for removing dissolved pollutants and fine suspended solids contained in the inflow water flowing in from the first bank 21 of the sedimentation sedimentation basin 20, and its internal structure is The structure is stacked in the order of the gravel layer 35, sand layer 32, the gravel layer 33 and the hole conduit 34 with the biofilm from the top, the outer structure is the first bank of the earth sedimentation battery on the wall contact with the soil sedimentation basin The sedimentary sedimentation basin 20 and the slow filter bed 30 are separated by 21, and a second bank 31 having a height lower than that of the first bank is formed on the opposite wall surface.

And the height difference h of the 1st bank 21 and the 2nd bank 31 as shown in FIG. 4 is not limited to a specific height difference, but it is appropriate according to the local topography and the weather conditions. The height difference can be adjusted.

In addition, the shape of the slow filter bed 30 of the present invention is not particularly limited to the shape as in the soil sedimentation basin, and may take various forms such as square, rectangular, trapezoidal, circular, etc. in consideration of the inclined topography of the highland agricultural region. .

Therefore, when the inflow water exceeds the processing capacity of the slow filter bed 30, by forming the second bank (31) lower than the height of the first bank (21), the inflow water flowing into the slow filter bed overflows to the outside The outflow water leaked to the outside is introduced into the external drainage channel.

And the inflow water normally processed in the slow filter bed 20 through the sand layer 32 and the gravel layer 33 is discharged to an external drainage channel through the sewage pipe 34 and the discharge part 40 at the bottom. At this time, when the excess flow rate out of the processing capacity of the slow filter bed 30 from the soil sedimentation basin 20 flows into the slow filter bed 30, the flow rate excessively introduced into the slow filter through the bypass discharge part is discharged to an external drainage channel. do.

A typical slow sand filter is a conventional filtration system that has been recognized for more than two centuries in Europe. In general, slow sand filtration is used to filter 70 to 90 cm thick layers of sand at a filtration rate of about 4 to 5 m / day. Turbidity and bacteria are almost completely removed and soluble substances such as ammonia, iron, and manganese are well removed. It is known. In addition, the longer the duration of filtration, the gelatinous microbial film is formed up to several cm deep from the surface of the sand layer. Dissolved contaminants are biologically removed from the microbial membrane, and bacteria, pesticides, and ammonia can be adsorbed by the deep sand. However, the conventional slow sand filtration was performed in a continuous flow of water purification process. It has not been applied to batch flows due to properties.

The slow sand filter bed of the present invention is a gravel layer 35 having a biofilm having a filling rate of 5 to 30% (V / V) from the surface of the sand layer, unlike the general sand filter bed to induce biological treatment of contaminants from the initial operation. Was introduced.

Therefore, the slow filter bed 30 is different from the general sand filter bed, since it forms a microbial layer 35 filled with gravel (a) coated with a biofilm (b) on the sand layer 32 from the beginning of construction. The biodegradation of dissolved organic matter is possible, and the deep sand allows biodegradation by adsorbing colloidal material and adsorption of relatively difficult biodegradable material. This slow filtration operation is reactivated once a year by surface cleaning and some replacements.

And the filling rate of the gravel layer 35 having a biofilm on slow filtration can be applied by varying 5 to 30% (V / V) with respect to the volume of the slow filtration according to the conditions of the installation site.

In the present invention, when the filling rate of the biofilm-coated gravel layer 35 for the slow filtration phase is less than 5% (V / V), the thickness of the gravel layer on which the biofilm is formed is thin and is contained in the influent due to the lack of microorganisms. If the filling rate of the biofilm-coated gravel layer 35 exceeds 30% (V / V), the thickness of the sand layer inside is relatively thin, so that dissolved pollutants cannot be treated properly. The biological removal efficiency of the material is increased, but the filtration function in the sand layer may be deteriorated.

In the present invention, the biofilm refers to a mucous membrane of a microorganism formed on a solid surface and its contents, and the formation thereof is performed by a combination of physical, chemical, and biological phenomena. The biofilm used in the present invention was acclimated using sludge of a general activated sludge process to form a biofilm, and even during a dried state (rest period) in which non-point pollutants were not introduced until about 15 days. A gravel layer using a biofilm that maintains activity and can remove stable organic substances and nitrogen compounds is constructed.

Therefore, the apparatus for treating non-point pollutants generated in high-altitude agricultural areas according to the present invention can be easily operated in high-altitude agricultural areas consisting of terrains of slopes having a difference in height and height of the ground, since the device can be operated by a small force. It is a device that can be used.

Hereinafter, the configuration of the present invention in detail through the following examples.

(Example)

1. Operation of the reactor

       In order to understand the treatment capacity of non-point pollutants generated in the high-altitude agricultural region according to the present invention, an experiment was conducted using a laboratory scale reactor equipped with a soil removal device and a slow filter bed.

       The earth and sand removal device was installed in a rectangular reactor of 10 L in effective volume, and a slow filter bed was installed in a cylindrical reactor of 15 L in effective volume of 0.2 m in diameter. Inflow concentrations were obtained as follows. The slow filter bed formed a biofilm using sludge of a general activated sludge process, and the gravel layer was filled with a filling rate of 5% (V / V) on the surface of the slow filter bed.

In this experiment, the synthetic sewage according to [Table 1] was prepared and tested. The earth and sand removal facility introduced the synthetic sewage with the concentrations shown in [Table 1] at 600 L each time for a total of 20 times for 5 days without rainfall. This flow corresponds to the amount of nonpoint pollutants in high-land agricultural areas with an annual rainfall of 1,200 mm and an area of 10 m ² .

On the other hand, the slow filter bed was injected 200 L each time for a total of 20 times of 5 days prior to rainy days, using the sediment removal facility effluent as the influent. This flow rate corresponds to the initial 20 mm of rainfall, taking into account the tendency for soluble pollutants to run out.

division pH COD _Cr (mg / L) BOD ₅ (mg / L) SS (mg / L) TN (mg / L) TP (mg / L) density 6.2 to 7.3 150-230 100-170 650-970 13-45 4-12

2. Driving Result

Removal ability of soil removal facility

The removal capacity of each soil contaminant in the soil removal facility is determined by chemical oxygen demand (COD), suspended solids (SS), and total nitrogen (TN) as shown in the attached graph of FIG. ), The average concentrations of effluent were 28, 32, 11, and 4 mg / L, respectively, and the removal efficiencies were 86%, 96%, 63%, and 60%, respectively. In the experiment conducted on the basis of 20 days of the preceding rainwater days, it was possible to achieve a constant effluent quality over the previous time. As a result, the introduction of the soil removal facility of the present invention for the removal of pollutants based on farmland due to rainfall runoff characteristics has proved feasible.

I. Removal ability on slow filtration

      The removal capacity of each contaminant in the slow filtration is shown in the graph shown in FIG. 6 of the accompanying drawings, as shown in FIG. 6, chemical oxygen demand (COD), suspended solids (SS), and total nitrogen (TN). The mean effluent concentrations of total phosphorus (TP) were 12, 6, 4 and 2 mg / L, respectively, and the removal efficiencies were 57, 81, 62 and 48%, respectively. In the experiment conducted on the basis of 5 days of the preceding rainy days, the effluent quality deteriorated as the cycle was repeated, but a relatively constant effluent quality could be achieved. Thus, the introduction of the slow filtration phase of the present invention for the removal of contaminants based on the farming management method due to rainfall runoff characteristics proved to be feasible.

As described above, the suspended matter is mostly removed from the soil removal facility, and when the suspended matter is removed, organic matter, total nitrogen, and total phosphorus are also removed. In addition, it was confirmed that the removal of residual contaminants on the sand filtration smoothly.

Therefore, the conventional apparatus for treating a non-point source can remove only soil or sand, which is mainly a high specific gravity pollutant, by a physical treatment method. It was confirmed by the above example that the removal of soil or sand, which is a high specific gravity contaminant, can treat organic substances, nitrogen compounds, etc. contained in nonpoint source.

In particular, the biofilm formed on the surface of the gravel is a non-point pollutant that flows into the non-point pollutant treatment device during the rain even if it has a 15-day rest period in the absence of water in the reactor during the rainy season when there is no rain inside the reactor. It could be confirmed by the above embodiment that it can be processed normally.

As described above, the superiority of the apparatus for treating non-point pollutants according to the present invention has been demonstrated by the above embodiments, but the configuration of the present invention is not necessarily limited only to the above embodiments, and does not depart from the technical spirit of the present invention. Many substitutions and variations are possible without departing from the scope of the invention.

1 is a view showing the variation over time of the flow rate and dissolved pollutants and the amount of soil caused by rainfall in the high-land agricultural region;

Figure 2 is a view showing a state of the cross section of the non-point pollutant treatment apparatus generated in the high-range agricultural region according to the present invention installed in the high-range agricultural region;

3 is a cross-sectional view of a non-point pollutant treatment apparatus occurring in a high-altitude agricultural region according to the present invention;

Figure 4 is a cross-sectional view showing the slow filter of the non-point pollutant treatment apparatus according to the present invention;

 5 is a view showing the removal rate of pollutants by the soil removal facility of the non-point pollutant treatment apparatus according to the present invention;

 6 is a view showing the removal rate of contaminants by the slow filter phase of the non-point pollutant treatment apparatus according to the present invention.

＊ Explanation of symbols on main part of drawing ＊

10: sump drainage 20: soil sedimentation basin

30: slow filtration phase 40: discharge part

50: bypass discharge

Claims (6)

In the device for removing non-point pollutants generated in high-land agricultural region, A catchment drainage channel for collecting non-point pollutants discharged by rainfall from the highland agricultural region; A sedimentation sedimentation basin for removing stormwater and sediment; Slow filter bed to remove dissolved material; A discharge part for discharging the effluent passing through the slow filter phase to the outside; And And the excess flow rate bypass bypass for bypassing the slow filter phase; Treatment apparatus for non-point pollutants generated in the high-land agricultural region, characterized in that consisting of.        The method of claim 1,        The catchment drainage channel has an arrangement structure formed of a line type catchment line surrounding the outer periphery of the highland agricultural region and an internal catchment channel traversed from the upper part of the slope to the lower part with a predetermined interval inside the highland agricultural region. Apparatus for treating non-point pollutants generated in a high cold agricultural region, characterized in that the lower end of the sump drainage is connected to the lower outer sump drainage.        The method of claim 1, The sedimentary sediment is generated in the highland agricultural region, characterized in that the high drainage farmland is connected to the sump drainage to the adjacent wall surface, the first bank is formed so that the rainfall collected on the opposite wall can flow over the slow filter. Apparatus for treating non-point pollutants. The method of claim 1, The slow filter bed is a non-point pollutant treatment device generated in a high-altitude agricultural region, characterized in that the internal structure of the structure stacked in the order of the gravel layer, sand layer, gravel layer and perforated pipe with a biofilm from the top. The method of claim 1, In the slow filter bed, the sediment sedimentation basin and the slow filter bed are separated by the first bank of the soil sedimentation cell on the wall surface of which the outer structure is in contact with the soil sedimentation basin, and on the opposite wall, the second bank is formed which is lower than the height of the first bank. Treatment apparatus for non-point pollutants generated in high-altitude agricultural region, characterized in that the structure. The method according to any one of claims 1, 4 or 5, The slow filter bed is a non-point pollutant treatment device generated in a high-altitude agricultural region, characterized in that the filling rate of the biofilm-coated gravel on the top of the sand layer is about 5 to 30% (V / V).

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