KR102629612B1 - Non-point pollution treatment facilities - Google Patents

Abstract

A non-point pollution reduction facility according to an embodiment of the present invention includes a settling tank for settling some contaminants of rainwater flowing in through an inlet on one side; A filtration tank equipped with a filter media layer for filtering the rainwater flowing in from the settling tank to remove remaining contaminants of the rainwater; and a backwashing unit for backwashing the filter media of the filter media layer with air, wherein the filter media layer includes a backwash promotion member to promote backwashing of the filter media when the filter media is backwashed by the backwash unit. do.

Description

Non-point pollution reduction facilities{NON-POINT POLLUTION TREATMENT FACILITIES}

The present invention relates to a non-point pollution reduction facility that removes contaminants contained in rainwater.

Pollutants that pollute the environment can be broadly classified into point pollution sources, where the emission point of pollutants is clear, and non-point pollution sources, where the emission point of pollutants is fluid and unclear. Point pollution sources refer to sources that discharge pollutants to a certain point through conduits or waterways, such as wastewater discharge facilities, sewage generation facilities, livestock farms, etc., while non-point pollution sources refer to sources that discharge pollutants to a certain point such as cities, roads, farmlands, mountains, and construction sites. It refers to an emission source that emits pollutants irregularly.

The above-mentioned point pollution sources are easy to collect because the outflow path of pollutants is clear, and the seasonal impact is relatively small, making it possible to predict the amount generated throughout the year, making it easy to design and manage treatment facilities such as treatment plants, whereas non-point pollution sources are easy to collect. Non-point pollution reduction facilities are necessary because the outflow and discharge routes of pollutants are not clearly distinguished, making collection difficult and the amount of pollutants greatly dependent on meteorological conditions such as precipitation, making the design and maintenance of treatment facilities difficult.

Meanwhile, the non-point pollution reduction facility includes a filtration tank, a sedimentation tank, and a backwashing device, and is equipped with a filter media layer in the filtration tank to reduce pollutants contained in rainwater. These non-point pollution reduction facilities use a backwashing device to backwash the filter media in the filter media layer, but there is a limitation in that the backwashing ability is not effective. In addition, cleaning of settled contaminants is easy due to the narrow structure of the space due to the partition wall in the sedimentation tank. There is a limit to what is not done.

Republic of Korea Patent Publication No. 10-2488107

The present invention was created to solve the above problems, and its purpose is to provide a non-point pollution reduction facility in which backwashing of filter media is effective and maintenance of the sedimentation tank is smooth.

In order to achieve the above object, a non-point pollution reduction facility according to an embodiment of the present invention includes a settling tank for settling some contaminants of rainwater flowing in through an inlet on one side; A filtration tank equipped with a filter media layer for filtering the rainwater flowing in from the settling tank to remove remaining contaminants of the rainwater; and a backwashing unit for backwashing the filter media of the filter media layer with air, wherein the filter media layer includes a backwash promotion member to promote backwashing of the filter media when the filter media is backwashed by the backwash unit. In the sedimentation tank, an outlet communicating with the filtration tank is formed at the other side, a flow pipe connected to the outlet at one end is disposed therein, a perforated plate is installed at the other end of the flow pipe, and the flow pipe is formed of oil floating in water. An opening through which contaminants flow is located at the bottom to prevent grease and grease from moving toward the filter tank, and an inverted U shape prevents some of the contaminants, which are relatively heavier than the remaining contaminants, from rising to the top even if they enter the opening at the bottom. Alternatively, it is formed in an omega (Ω) shape, and the perforated plate is installed in the opening at the bottom to prevent some of the contaminants, which are relatively larger in size than the remaining contaminants, from being filtered and introduced into the flow pipe.

The filter media layer includes a perforated chamber installed inside the filtration tank; The filter medium is accommodated in the perforated chamber and adsorbs the contaminants; and the backwash promotion member that removes the contaminants by colliding with the contaminants adsorbed on the filter media when the air is supplied to the filter media layer.

The filter medium is made of polyester fibers agglomerated, and the backwashing promotion member is made of polyethylene, which is a harder material than the filter medium, and may be in the shape of smaller particles than the filter medium.

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The sedimentation tank has a reverse outlet communicating with the filtration tank formed at the lower part of the other side, a check door whose top is hinged to the reverse outlet is disposed inside, and a submersible pump connected to a wastewater discharge pipe can be installed inside the sedimentation tank. there is.

The backwash unit includes an air blower that provides high-pressure air; an air supply pipe connected from the air blower to the filter media layer; and a diffuser connected to the air supply pipe and disposed within the filter media layer.

The present invention provides the effect of reliably and easily removing contaminants adsorbed on the filter medium by providing a backwash promotion member in the filter medium layer that promotes backwashing of the filter medium when backwashing the filter medium of the filter medium layer with a backwash unit. has

In addition, the present invention has an L-shaped flow pipe instead of a partition inside the sedimentation tank, so that the sedimentation tank can be effectively maintained as the structure inside the sedimentation tank is simplified while having the same contaminant settling function as the partition wall. As another example, the flow pipe By forming this inverted U (∩) shape or omega (Ω) shape, it has the advantage of having the function of separating oil and grease as well as contaminant precipitation.

Figure 1 is a diagram showing a non-point pollution reduction facility according to an embodiment of the present invention.
Figure 2 is a diagram showing the state before rainwater flows into the non-point pollution reduction facility of Figure 1.
Figure 3 is a diagram showing the state of rainwater flowing into the non-point pollution reduction facility of Figure 2.
Figure 4 is a diagram showing that the filter media layer is backwashed and backwash wastewater is discharged from the non-point pollution reduction facility of Figure 3.
Figure 5 is a diagram showing another example of a flow pipe installed in the non-point pollution reduction facility of Figure 3.

Hereinafter, with reference to the attached drawings, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention. However, when describing preferred embodiments of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the same symbols are used throughout the drawings for parts that perform similar functions and actions. In addition, in this specification, terms such as 'top', 'top', 'upper surface', 'bottom', 'bottom', 'bottom', 'side', etc. are based on the drawings, and in reality, the components are arranged It may vary depending on the direction in which it takes place.

Additionally, throughout the specification, when a part is said to be 'connected' to another part, this is not only the case when it is 'directly connected', but also when it is 'indirectly connected' with another component in between. Also includes. In addition, 'including' a certain component means that other components may be further included rather than excluding other components, unless specifically stated to the contrary.

Figure 1 is a diagram showing a non-point pollution reduction facility according to an embodiment of the present invention, and Figure 2 is a diagram showing a state before rainwater flows into the non-point pollution reduction facility of Figure 1.

In addition, Figure 3 is a diagram showing the state in which rainwater flows into the non-point pollution reduction facility of Figure 2, and Figure 4 is a diagram showing the filter media layer being backwashed and the backwash wastewater being discharged from the non-point pollution reduction facility of Figure 3. .

Referring to the drawings, a non-point pollution reduction facility according to an embodiment of the present invention includes a sedimentation tank 100, a filtration tank 200, and a backwash unit 300.

The settling tank 100 is configured to settle some contaminants of rainwater flowing in through the inlet 100a on one side.

In addition, the filtration tank 200 is configured to have a built-in filter media layer 210 that filters rainwater flowing in from the settling tank 100 and removes remaining contaminants in the rainwater.

At this time, some of the contaminants have relatively larger particles than the remaining contaminants, and settle at the bottom of the sedimentation tank 100 and do not flow into the filtration tank 200 together with rainwater. In contrast, the remaining contaminants are contaminants whose particles are relatively smaller than some contaminants, and do not settle at the bottom of the settling tank 100, but rather flow together with the rainwater and move to the filtration tank 200 together with the rainwater.

Specifically, the sedimentation tank 100 is a water tank-shaped structure with an internal space, and rainwater flows in through an inlet 100a formed on one side. In this way, rainwater flowing into the settling tank 100 is received in the settling tank 100 for a certain period of time, and in this process, some of the contaminants in the rainwater settle to the bottom of the settling tank 100.

In addition, the filtration tank 200 is a water tank-shaped structure with an internal space and is connected to the settling tank 100, and rainwater flows out of the settling tank 100 through the outlet 100b and flows into the filtration tank 200. This rainwater is filtered by the filter layer 210 disposed in the filtration tank 200 to remove the remaining contaminants of the rainwater, and is then discharged to the outside through the outlet 200a formed in the filtration tank 200. For reference, reference numeral M denotes a covered manhole formed in the sedimentation tank 100 and the filtration tank 200.

More specifically, the sedimentation tank 100 may have an outlet 100b communicating with the filtration tank 200 formed on the other side, and a flow pipe 110 may be disposed inside. At this time, the flow pipe 110 may have a structure in which one end is connected to the outlet (100b) and a perforated plate 111 is installed at the other end.

A conventional sedimentation tank has partition walls placed inside it, and the internal space is divided by these partition walls. Since rainwater flowing into the sedimentation tank has a partition on its way to the outlet, the sediment overflows the partition and moves toward the outlet, and the movement of the sediment towards the outlet is suppressed by the partition. As a result, soil, etc. settle in the space on the opposite side of the outlet from the sedimentation tank based on the partition wall. However, when a partition wall is placed inside the sedimentation tank like this, the space where sediment accumulates in the sedimentation tank becomes narrow due to the partition wall, so there is a limitation in that cleaning the sedimentation tank periodically is not carried out effectively in terms of maintenance.

In order to overcome these limitations, the present invention provides a flow pipe 110 instead of a partition inside the sedimentation tank 100, so that the sedimentation tank 100 can be effectively maintained as the internal structure of the sedimentation tank 100 is simple. . The flow pipe 110 has a structure in which one end is connected to the outlet (100b) and a perforated plate 111 is installed at the other end. At this time, the perforated plate 111 can filter out contaminants. That is, large contaminants such as waste generated at a construction site, dumped on the street, or fallen leaves from trees can be filtered by the perforated plate 111 and prevented from moving to the filtration tank 200.

As an example, the flow pipe 110 may be formed in an L shape, as shown in FIGS. 1 to 4. That is, the flow pipe 110 may be bent into an L shape from the outlet 100b and extend upward. At this time, the perforated plate 111 may be installed in the upper opening of the flow pipe 110.

In this way, the flow pipe 110 extends upward and an opening is formed at the top, so that heavy contaminants cannot rise to the top opening and may settle at the bottom of the settling tank 100. In addition, the flow pipe 110 has a structure in which a perforated plate 111 is installed at the upper opening, so that large-sized contaminants are filtered by the perforated plate 111 and cannot be drawn into the flow pipe 110, so they are not flowing into the filtration tank 200. You won't be able to move.

Additionally, as another example, the flow pipe 110 may be formed in an inverted U (∩) shape or an omega (Ω) shape, as shown in FIG. 5 . That is, the flow pipe 110 may have a structure extending from the outlet 100b in an inverted U (∩) shape or an omega (Ω) shape. At this time, the perforated plate 111 may be installed in the lower opening of the flow pipe 110.

In this way, the flow pipe 110 takes an inverted U (∩) shape or an omega (Ω) shape and an opening is formed at the bottom, so that heavy contaminants among the contaminants cannot rise to the top even if they flow into the lower opening, ultimately ending up in the sedimentation tank (100). ) may settle to the bottom. In addition, the flow pipe 110 has a structure in which a perforated plate 111 is installed at the bottom opening, so that large-sized contaminants are filtered by the perforated plate 111 and cannot be introduced into the flow pipe 110, so that they are directed to the filtration tank 200. You won't be able to move.

Furthermore, the flow pipe 110 has an opening located at the bottom to prevent oil and grease floating in the water from moving toward the filtration tank 200. Even small amounts of oil and grease can be fatal to aquatic life, and they cause environmental pollution during leaks, accidents such as vehicle overturns, vehicle washing, and unauthorized dumping of waste oil. However, according to another example of the present invention, the bottom opening of the flow pipe 110 is located at the bottom of the sedimentation tank 100, not the top, so that when the precipitation tank 100 is filled with rainwater, the oil and grease floating in the rainwater flows to the bottom of the flow pipe 110. As it cannot move to the opening side, oil and grease can be separated from rainwater.

In addition, the sedimentation tank 100 has a reverse outlet 100c that communicates with the filtration tank 200 at the lower part of the other side, and a check door 120 with its upper end hinged to the reverse outlet 100c is disposed inside the sedimentation tank ( Inside 100), a submersible pump (P) connected to the wastewater discharge pipe (D) is installed.

As shown in FIG. 3, in the process of settling some of the contaminants in the rainwater in the settling tank 100 and removing the remaining contaminants in the rainwater in the filtration tank 200, the water level in the settling tank 100 is higher than the water level in the filtration tank 200. The end of the check door 120 is lowered by the water pressure of the sedimentation tank 100, thereby maintaining the check door 120 in a closed state.

In addition, as shown in FIG. 4, in the process of backwashing in the filtration tank 200, the submersible pump (P) is operated to discharge settled wastewater from the bottom of the settling tank 100, thereby lowering the water level in the settling tank 100 to the filtration tank 200. Since the water level is lower than , the end of the check door 120 rises due to the water pressure of the filtration tank 200, thereby maintaining the check door 120 in an open state. As a result, the backwash wastewater from the filtration tank 200 also moves to the sedimentation tank 100 and is discharged to the outside through the wastewater discharge pipe (D) together with the sedimentation wastewater from the sedimentation tank 100 by the submersible pump (P).

Meanwhile, the backwashing unit 300 is configured to backwash the filter medium 212 of the filter medium layer 210 with air.

Specifically, the backwash unit 300 may include an air blower 310, an air supply pipe 320, and an air diffuser 330.

The air blower 310 is a device that provides high pressure air, and a ring blower may be used as an example.

Additionally, the air supply pipe 320 is connected from the air blower 310 to the filter media layer 210.

And the diffuser 330 is connected to the air supply pipe 320 and disposed within the filter media layer 210.

This diffuser 330 has a structure in which a plurality of pores are formed. The air that moves from the air blower 310 through the air supply pipe 320 to the diffuser 330 is dispersed through the plurality of pores and forms bubbles. It is injected into the filter layer 210. As the injected bubbles move upward and pass through the filter medium layer 210, contaminants in the filter medium layer 210 are dropped from the filter medium 212 and go down to the lower part of the filter tank 200.

Here, the filter media layer 210 includes a filter media 212 for filtering remaining contaminants from rainwater in the filter tank 200, and may further include a backwash promotion member 213. That is, the filter media layer 210 may include a backwash promotion member 213 that promotes backwashing of the filter media 212 when the filter media 212 is backwashed by the backwash unit 300.

Looking at the filter layer 210 in detail, it is as follows.

The filter media layer 210 may include a perforated chamber 211, a filter media 212, and a backwash promotion member 213.

First, the perforated chamber 211 is a chamber for accommodating the filter medium 212 and is installed inside the filtration tank 200. This perforated chamber 211 is formed by placing an upper plate and a lower plate spaced apart from each other in the upward direction. As the inner side of the filtration tank 200 is blocked on the side, a chamber structure with an internal receiving space can be taken with only the upper plate and the lower plate. there is. At this time, each of the upper and lower plates takes the shape of a plurality of small holes formed by drilling into the plate. Due to the perforated chamber 211 of this structure, the filter medium 212 and the backwashing promotion member 213 accommodated therein do not escape to the outside, but rainwater can easily pass through the perforated chamber 211. For reference, reference numeral 211a is an inspection port.

Additionally, the filter medium 212 is accommodated in the perforated chamber 211 and serves to adsorb remaining contaminants. At this time, the filter medium 212 is made of a fibrous material, and specifically, it takes the shape of agglomerated fibers made of polyester. As an example, the filter medium 212 takes the shape of fiber threads with a diameter of 0.2 mm to 0.3 mm aggregated to the same size as a ping-pong ball. The filter medium 212, which has this shape, is formed with a plurality of pores. As rainwater passes through these pores, the remaining contaminants contained in the rainwater are adsorbed to the fibers of the filter medium 212, thereby filtering the rainwater.

And the backwashing promotion member 213 is accommodated in the perforated chamber 211 and is configured to collide with the contaminants adsorbed on the filter medium 212 when air is supplied to the filter medium layer 210. It plays a role in removing the

To this end, the backwashing promotion member 213 may be formed in a smaller size than the filter medium 212. Specifically, it may have a granular shape made of polyethylene, which is a harder material than the filter medium 212.

In this way, the backwashing promotion member 213 is formed in a smaller size than the filter medium 212, so that it can be inserted into the pores of the filter medium 212 formed of fibers, thereby colliding with contaminants adsorbed in the pores of the filter medium 212. Accordingly, contaminants can be reliably removed from the filter medium 212.

In addition, the backwashing promotion member 213 is made of polyethylene, which is a harder material than the filter medium 212, which is made of polyester, thereby increasing the collision effect of the backwashing promotion member 213 against the filter medium 212. (212) Contaminants can be more easily removed.

In addition, the backwashing promotion member 213 may have a specific gravity of 0.6 to 0.8. If the specific gravity is less than 0.6, the flow in the rainwater is not smooth, and if the specific gravity is greater than 0.8, it floats too easily to the top due to air bubbles. Accordingly, backwashing can be promoted most effectively when the specific gravity is 0.6 to 0.8.

In addition, the backwashing promotion member 213 may be formed in an irregular shape, that is, an unspecified shape rather than a fixed shape. The backwashing promotion member 213 takes the shape of a grain. In this case, the grain shape means a shape like a small particle, but the specific and exact shape is not specified. As such, the backwashing promotion member 213 is formed slightly differently overall. By taking on an irregular shape as much as possible, contaminants in each of the irregularly shaped pores of the filter medium 212 can be effectively removed.

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As a result, in the present invention, when backwashing the filter medium 212 of the filter medium layer 210 with the backwash unit 300, the backwash promotion member 213, which promotes backwashing of the filter medium 212, is used in the filter medium layer ( By being configured in 210), contaminants adsorbed on the filter medium 212 can be removed reliably and easily.

In addition, the present invention has an L-shaped flow pipe 110 instead of a partition inside the settling tank 100, so that it has the same contaminant settling function as a partition wall and the structure inside the settling tank 100 is simplified, so that the settling tank 100 can be effectively maintained, and as another example, the flow pipe 110 is formed in an inverted U (∩) shape or an omega (Ω) shape, so that it can have a function of separating contaminants and separating oil and grease.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will recognize that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will understand. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

100: sedimentation tank 100a: inlet
100b: outlet 200c: reverse outlet
110: flow pipe 111: perforated plate
120: check door 200: filtration tank
200a: discharge port 210: filter layer
211: perforated chamber 211a: inspection hole
212: filter material 213: backwash promotion member
300: Backwash unit 310: Air blower
320: air supply pipe 330: diffuser
M: Manhole P: Submersible pump
D: Wastewater discharge pipe

Claims (9)

A sedimentation tank that settles some contaminants of rainwater flowing in through an inlet on one side;
A filtration tank equipped with a filter media layer for filtering the rainwater flowing in from the settling tank to remove remaining contaminants of the rainwater; and
It includes a backwashing unit that backwashes the filter media of the filter media layer with air,
The filter media layer includes a backwash promotion member that promotes backwashing of the filter media when the filter media is backwashed by the backwash unit,
The sedimentation tank has an outlet communicating with the filtration tank formed on the other side, and a flow pipe connected to the outlet at one end is disposed therein,
A perforated plate is installed at the other end of the flow pipe,
The flow pipe is,
An opening through which contaminants enter is located at the bottom to prevent oil and grease floating in the water from moving to the filter tank,
It is formed in an inverted U (∩) shape or an omega (Ω) shape to prevent some of the contaminants, which are relatively heavier than the remaining contaminants, from rising to the top even if they flow into the opening at the bottom,
A non-point pollution reduction facility in which the perforated plate is installed in the opening at the bottom to prevent some of the contaminants that are relatively larger than the remaining contaminants from being filtered and introduced into the flow pipe.
According to paragraph 1,
The filter layer is,
A perforated chamber installed inside the filtration tank;
The filter medium is accommodated in the perforated chamber and adsorbs the contaminants; and
When the air is supplied to the filter medium layer, the backwash promoting member collides with the contaminants adsorbed on the filter medium to remove the contaminants;
Non-point pollution reduction facilities including.
According to paragraph 2,
The filter medium has a shape in which fibers made of polyester are aggregated,
The backwashing promotion member is a non-point pollution reduction facility made of polyethylene, which is a harder material than the filter medium, and has a particle shape smaller than the filter medium.
delete delete delete delete According to paragraph 1,
The sedimentation tank has a reverse outlet communicating with the filtration tank formed at the lower part of the other side, and a check door whose upper end is hinged to the reverse outlet is disposed inside,
A non-point pollution reduction facility equipped with a submersible pump connected to a wastewater discharge pipe inside the sedimentation tank.
According to paragraph 1,
The backwash unit,
Air blower providing high pressure air;
an air supply pipe connected from the air blower to the filter media layer; and
a diffuser connected to the air supply pipe and disposed within the filter medium layer;
Non-point pollution reduction facilities including.

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