KR102555069B1 - Compact type non-point pollution treatment facilities with efficient backwashing function and backwashing methods thereof - Google Patents

Abstract

Disclosed are a non-point pollution abatement facility having a compact structure capable of efficient backwashing and a backwashing method thereof. According to one aspect of the present invention, a pretreatment tank having a rainwater inlet and a first drainage pump for discharging stagnant water to the outside; a filtration tank inlet separated from the pretreatment tank by an overflow wall so that rainwater overflows and flows in from the pretreatment tank and includes a second drain pump for discharging stagnant water to the outside; a filtration tank separated from the pretreatment tank and the filtration tank inlet by a first partition wall; and a treated water tank separated from the filter tank by a second partition wall and having a treated water outlet, wherein the first partition wall has a filter tank inlet at a lower portion connecting the filter tank inlet and the filter tank, 2 The partition wall has a filter tank outlet connecting the filter tank and the treated water tank at an upper portion, and the filter tank is disposed above the first filter medium layer disposed higher than the filter tank inlet and spaced apart from the filter tank outlet A second filter medium layer disposed lower than the first filter medium layer, a diffuser disposed below the first filter medium layer to spray air for backwashing, and a backwash water jet disposed above the second filter medium layer to spray backwashing water. and a nozzle, wherein the first filter medium layer includes a first lower perforated plate partitioning the first filter medium layer, and a first upper perforated plate disposed above the first lower perforated plate and spaced apart to partition the first filter medium layer. wherein a first backwash wastewater discharge groove is formed on an upper surface of the first upper perforated plate, and discharge ends at both ends of the first backwash wastewater discharge groove pass through a pair of first backwash wastewater outlets formed in the first partition wall. It is connected to the pretreatment tank, and the second filter medium layer comprises a second lower perforated plate partitioning the second filter medium layer, and a second upper perforated plate disposed above the second lower perforated plate and partitioning the second filter medium layer. wherein a second backwash wastewater discharge groove is formed on the upper surface of the second upper perforated plate, and both end discharge ends of the second backwash wastewater discharge groove pass through a pair of second backwash wastewater outlets formed in the first partition wall. Connected to the pretreatment tank, the pair of first backwash wastewater outlets and the pair of second backwash wastewater outlets are provided with check valves that allow only one-way flow from the filtration tank to the pretreatment tank, respectively. A filtering nonpoint pollution abatement facility may be provided.

Description

Compact non-point pollution reduction facility capable of efficient backwashing and its backwashing method

The present invention relates to a non-point pollution reduction facility having a compact structure capable of efficient backwashing and a backwashing method thereof.

Contaminated water that is mixed with rainwater and flows out is called rainwater. Pollutants flow out with rainwater from nonpoint sources such as roads. It is a facility.

Types of non-point pollution abatement facilities include natural facilities and device-type facilities. Natural-type facilities include detention facilities, artificial wetlands, infiltration facilities, and vegetation facilities. Type facilities, flocculation sedimentation treatment facilities, and biological treatment facilities are available.

Among them, the filtering type facility is recognized as the most effective facility in a small available site because it not only has a fast treatment rate of pollutants and excellent treatment efficiency, but also has advantages of simple installation and a small installation area.

Such a filtering type nonpoint pollution abatement facility includes an upflow type facility and a downflow type facility.

Among them, downflow facilities have excellent treatment efficiency, but there is a high possibility of blockage of the filter layer due to the accumulation of sediment on the surface of the filter layer, and it is difficult to manage the filter layer, such as re-leakage of pollutants trapped in the filter layer in the early stage of concentrated rainfall. Therefore, upstream facilities are mostly used as filtering nonpoint pollution abatement facilities.

Conventional upflow filtration type non-point pollution abatement facilities are generally composed of a pretreatment tank, a filtration tank, and a treatment tank. The pretreatment tank allows the inflowed rainwater to stay for a certain period of time to precipitate and remove solid materials with a heavy specific gravity such as soil, and the filtration tank passes the pretreated rainwater through the filter media layer in an upward flow to adsorb or capture finer particulate matter on the filter media. After removing the treated water, the treated water tank stores the treated water that has passed through the filtration tank for a certain period of time and then discharges it to the water system. In addition, the treated water stored in the treated water tank is used as backwashing water to wash the filter media layer after the end of the rain.

On the other hand, after the rain is over, a backwashing process for the filter layer and a stagnant water drainage process are performed to discharge all stagnant water from the pretreatment tank and filtration tank to the outside in preparation for the next rainfall.

Republic of Korea Patent Registration No. 10-1633767 (2016.07.08, upstream non-regular pollution reduction facility using flotation media) Republic of Korea Patent Registration No. 10-2291065 (2021.08.19, space-saving irregular pollution reduction facility and high-efficiency backwashing method)

Embodiments of the present invention provide a non-point pollution reduction facility of a compact structure capable of efficient backwashing as an upflow filtering type nonpoint pollution reduction facility and a backwashing method thereof.

According to one aspect of the present invention, a pretreatment tank having a rainwater inlet and a first drainage pump for discharging stagnant water to the outside; a filtration tank inlet separated from the pretreatment tank by an overflow wall so that rainwater overflows and flows in from the pretreatment tank and includes a second drain pump for discharging stagnant water to the outside; a filtration tank separated from the pretreatment tank and the filtration tank inlet by a first partition wall; and a treated water tank separated from the filter tank by a second partition wall and having a treated water outlet, wherein the first partition wall has a filter tank inlet at a lower portion connecting the filter tank inlet and the filter tank, 2 The partition wall has a filter tank outlet connecting the filter tank and the treated water tank at an upper portion, and the filter tank is disposed above the first filter medium layer disposed higher than the filter tank inlet and spaced apart from the filter tank outlet A second filter medium layer disposed lower than the first filter medium layer, a diffuser disposed below the first filter medium layer to spray air for backwashing, and a backwash water jet disposed above the second filter medium layer to spray backwashing water. and a nozzle, wherein the first filter medium layer includes a first lower perforated plate partitioning the first filter medium layer, and a first upper perforated plate disposed above the first lower perforated plate and spaced apart to partition the first filter medium layer. wherein a first backwash wastewater discharge groove is formed on an upper surface of the first upper perforated plate, and discharge ends at both ends of the first backwash wastewater discharge groove pass through a pair of first backwash wastewater outlets formed in the first partition wall. It is connected to the pretreatment tank, and the second filter medium layer comprises a second lower perforated plate partitioning the second filter medium layer, and a second upper perforated plate disposed above the second lower perforated plate and partitioning the second filter medium layer. wherein a second backwash wastewater discharge groove is formed on the upper surface of the second upper perforated plate, and both end discharge ends of the second backwash wastewater discharge groove pass through a pair of second backwash wastewater outlets formed in the first partition wall. Connected to the pretreatment tank, the pair of first backwash wastewater outlets and the pair of second backwash wastewater outlets are provided with check valves that allow only one-way flow from the filtration tank to the pretreatment tank, respectively. A filtering nonpoint pollution abatement facility may be provided.

The overflow wall extends in a first horizontal direction, and the first partition wall and the second partition wall each extend in a second horizontal direction perpendicular to the first horizontal direction, so that both surfaces of the first partition wall have the pretreatment tank and the second partition wall. The filtration tank inlet and the filtration tank are in contact with each other, and the filtration tank and the treatment tank are disposed on both sides of the second partition wall to be in contact with each other.

The rainwater inlet is formed on a sidewall facing the overflow wall in the second horizontal direction, and the pretreatment tank includes a diaphragm disposed so that rainwater introduced through the rainwater inlet collides with the diaphragm, and the diaphragm includes the first horizontal rainwater inlet. It extends in the direction but may be arranged to be spaced upward from the bottom surface of the pretreatment tank.

An upper end of the overflow wall may be disposed higher than the second backwash wastewater outlet.

a first water level sensor for detecting whether or not the water level of the filter tank has reached a predetermined first water level that is higher than the upper surface of the second upper perforated plate and lower than the lower end of the outlet of the filter tank; a second water level sensor for detecting whether or not the water level in the filtration tank reaches a predetermined second water level that is higher than the upper surface of the first upper perforated plate and lower than the lower surface of the second lower perforated plate; a third water level sensor for detecting whether or not the water level of the filter tank has reached a predetermined third water level lower than that of the first upper perforated plate; and operating the first drainage pump when the inflow of rainwater through the rainwater inlet is stopped and a backwashing process for the filter tank is started, and after operation of the first drainage pump, the first water level sensor, the second water level sensor, and the The control unit may further include a controller that controls the diffuser, the backwash water spray nozzle, the first drain pump, and the second drain pump according to a detection result of the third water level sensor.

The control unit operates the air diffuser to perform primary air cleaning when the water level in the filtration tank reaches the first water level, and operates the air diffuser when the water level in the filtration tank reaches the second water level to perform secondary air cleaning. Water washing may be performed by performing air washing, operating the second drain pump when the secondary air washing is completed, and operating the backwash water spray nozzle when the water level of the filtration tank reaches the third water level. .

The control unit may operate the backwash water spray nozzle when a predetermined time elapses after the operation of the diffuser pipe whenever the diffuser pipe is operated.

The control unit may perform a stagnant water draining process of discharging stagnant water from the pretreatment tank and the filtration tank to the outside by operating the first drain pump and the second drain pump when the water washing is completed.

According to another aspect of the present invention, in the backwashing method for the filter media layer of the upflow filtering non-point pollution reduction facility according to one aspect of the present invention according to claim 4, when the inflow of rainwater through the rainwater inlet is stopped, the first drainage Draining the pre-treatment tank by operating the pump; a primary air cleaning step of operating the diffuser when the water level of the filter tank reaches a predetermined first water level that is higher than the upper surface of the second upper perforated plate and lower than the lower end of the outlet of the filter tank; a secondary air cleaning step of operating the diffuser when the water level in the filtration tank reaches a predetermined second water level that is higher than the upper surface of the first upper perforated plate and lower than the lower surface of the second lower perforated plate; a filter tank drainage step of operating the second drain pump when the secondary air washing step is completed; a water washing step of operating the backwash water spray nozzle when the water level of the filter tank reaches a predetermined third water level lower than the lower surface of the first lower perforated plate; and a step of draining stagnant water by operating the first drain pump and the second drain pump when the washing with water is completed.

In the first air washing step and the second air washing step, the backwash water injection nozzle may be operated when a predetermined time elapses after the operation of the diffuser pipe.

In the first air washing step and the second air washing step, the operation state of the first drain pump may be maintained while the diffuser is operating.

In the first air washing step and the second air washing step, the injection amount of the backwash water sprayed through the backwash water spray nozzle is transmitted through the pair of first backwash wastewater outlets or the pair of second backwash wastewater outlets. The amount of backwash wastewater discharged may be the same as the amount of drainage through the first drainage pump.

According to an embodiment of the present invention, long-term operation of the filter medium layer and stable water quality may be ensured by separating the inlet of the pretreatment tank and the filter tank by an overflow wall and installing the filter medium layer in two stages in the filter tank.

In addition, a backwash wastewater discharge port having check valves installed is formed on the partition walls near the upper ends of the first filter media layer and the second filter media layer, respectively, and backwashing is performed on the first upper perforated plate of the first filter media layer and the second upper perforated plate of the second filter media layer. By forming a wastewater discharge groove and spraying the backwashing water together during air washing, the discharge of the air-separated wastewater may be performed more smoothly. On the other hand, air desorption wastewater refers to wastewater containing contaminants separated from the filter media by air washing, while backwash wastewater may refer to wastewater containing contaminants separated from the filter media by water washing. In , unless otherwise specified, backwash wastewater may be interpreted in a broad sense including air-discharged wastewater in addition to backwash wastewater in the narrow sense described above.

In addition, during air cleaning, backwash wastewater is discharged to the pretreatment tank through the backwash wastewater outlet without passing through the first filter media layer, thereby minimizing the problem of re-contamination of the first filter media layer that may occur when the backwash wastewater passes through the first filter media layer. You may.

In addition, by injecting a large amount of air into the first filter medium layer containing a large amount of solid material during air washing and injecting a small amount of air into the second filter material layer containing a small amount of solid material, efficient air consumption can be achieved, resulting in blower It can also reduce capacity and energy consumption.

In addition, since backwash wastewater can be discharged by discharging stagnant water in the pretreatment tank, facility simplification can be achieved by omitting the construction of a separate facility for backwash wastewater discharge.

1 is a diagram of an upflow filtering non-point pollution reduction facility according to an embodiment of the present invention;
2 is a cross-sectional view taken from A-A in FIG. 1;
3 is a cross-sectional view taken at B-B of FIG. 1;
4 is a cross-sectional view taken from C-C in FIG. 1;
5 is a cross-sectional view taken from D-D in FIG. 1;
Figure 6 is a cross-sectional view taken from E - E of Figure 1;
Figure 7 is a cross-sectional view taken from F - F of Figure 1;
8 is a view showing a control unit of the upflow filtering non-point pollution reduction facility of FIG. 1;
9 and 10 are diagrams showing the filtration process of the upflow filtration type non-point pollution reduction facility of FIG. 1,
11 is a view showing a backwashing method of the upflow filtering non-point pollution reduction facility of FIG. 1;
12 to 17 are diagrams for explaining each step of the backwashing method of FIG. 11 .

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

Terms used in the embodiments of the present invention may be interpreted as meanings that can be generally understood by those of ordinary skill in the art to which the present invention belongs, unless clearly defined otherwise, and only specific The examples are intended to be illustrative and are not intended to limit the present invention.

"System", "module", "~unit", etc. used in this specification may include or be implemented by computer-related software, hardware, or a combination of software and hardware.

In this specification, the singular form will be considered to include the plural form as well, unless otherwise specified.

In addition, when a part is described as "including" a certain component, it means that the corresponding part may further include other components.

In addition, when a component is described as "on", it means above or below the corresponding component, and does not necessarily mean that it is located on the upper side relative to the direction of gravity.

Also, when a component is described as being “connected” or “coupled” to another component, that component is not only directly connected to or coupled to another component, but also indirectly through another component. It may also include the case of being connected or combined with.

In addition, although terms such as first and second may be used to describe a certain component, these terms are only used to distinguish the corresponding component from other components, and the essence or sequence of the corresponding component is determined by the term. or order, etc., is not intended to be limiting.

1 is a view of an upflow filtering type non-point pollution reduction facility according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken from A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken from B-B in FIG. , Figure 4 is a cross-sectional view taken from C-C of FIG. 1, Figure 5 is a cross-sectional view taken from D-D of FIG. 1, Figure 6 is a cross-sectional view taken from E-E of FIG. 1, and FIG. - A cross-sectional view at F, and FIG. 8 is a view showing the control unit of the upflow filtering non-point pollution reduction facility of FIG.

1 to 8, the upflow filtering non-point pollution reduction facility 10 according to an embodiment of the present invention includes a pretreatment tank 100, a filtration tank inlet 200, a filtration tank 300, and a treatment water tank ( 400), and may further include a controller 500, a first water level sensor 510, a second water level sensor 520, and a third water level sensor 530.

The non-point pollution reduction facility 10 has a first side wall 11 and a second side wall 12 facing each other in a first horizontal direction (X-axis direction) and a second side wall 11 facing each other in a second horizontal direction (Y-axis direction). It is partitioned by the third side wall 13 and the fourth side wall 14, and may be formed in a rectangular parallelepiped shape as a whole.

The first sidewall 11 and the second sidewall 12 may each extend in the Y-axis direction, and the third sidewall 13 and the fourth sidewall 14 may each extend in the X-axis direction.

In this specification, the X-axis direction and the Y-axis direction may mean directions perpendicular to each other, and the up-down direction (Z-axis direction) may mean a direction perpendicular to the X-axis direction and the Y-axis direction.

The pretreatment tank 100 may be partitioned by a first side wall 11 , a third side wall 13 , an overflow wall 20 and a first partition wall 21 .

The overflow wall 20 may extend in the X-axis direction to separate the filter tank inlet 200 from the pretreatment tank 100.

The first partition 21 may extend in the Y-axis direction to separate the filtration tank 300 from the pretreatment tank 100 and the filter tank inlet 200 .

The third sidewall 13 may be disposed to face the overflow wall 20 in the Y-axis direction, and at the top of the third sidewall 13, a rainwater inlet 13a, which is a passage through which rainwater flows into the pretreatment tank 100, is provided. can be formed.

However, it is not necessarily limited to this, and the rainwater inlet may be formed on the upper part of the first sidewall 11 if necessary in consideration of the situation of the site where the corresponding facility is installed.

The pretreatment tank 100 may include a first drainage pump 110 and may further include a diaphragm 120 .

The first drainage pump 110 is disposed in the pretreatment tank 100 and may be used to discharge stagnant water remaining in the pretreatment tank 100 to the outside after rainfall ends. To this end, the first drain pump 110 may include a first drain pipe that is connected to the first drain pump 110 and is a discharge passage for stagnant water extending to the outside.

The diaphragm 120 may be disposed in front of the rainwater inlet 13a so that rainwater flowing into the pretreatment tank 100 through the rainwater inlet 13a collides with it.

For example, the partition plate 120 may extend in the X-axis direction, and both ends of the partition plate 120 in the X-axis direction may be connected to the first sidewall 11 and the first partition wall 21 .

Also, the diaphragm 120 may be disposed to be spaced upward from the bottom surface of the pretreatment tank 100 .

Therefore, rainwater colliding with the diaphragm 120 passes between the lower end of the diaphragm 120 and the bottom surface of the pretreatment tank 100, and then flows through the overflow wall 20 to flow into the filter tank inlet 200. .

The filter tank inlet 200 may be partitioned by a first side wall 11 , a fourth side wall 14 , an overflow wall 20 and a first partition wall 21 .

That is, the pretreatment tank 100 and the filtration tank inlet 200 may be arranged in a line in the Y-axis direction to contact the first partition wall 21 , respectively.

Therefore, the pretreatment tank 100 and the filtration tank inlet 200 can be separated from the filtration tank 200 by the first partition wall 21, and the filter tank inlet 200 is formed below the first partition wall 21. It may be directly connected to the filter tank 300 through the filter tank inlet 21a, and the pretreatment tank 100 includes a pair of first backwash wastewater outlets 21b formed on the first partition wall 21 and a pair of second backwash wastewater outlets 21b. It may be directly connected to the filtration tank 300 through the outlet 21c. As a result, compared to the case where the filtration tank inlet 200 is disposed between the pretreatment tank 100 and the filtration tank 300 in the X-axis direction, a more compact structure may be possible, and the pretreatment tank 100 and the filtration tank ( 300), it is possible to omit the installation of a separate pipe to connect the equipment, so that facility simplification can be achieved.

The filter tank inlet 200 may include a second drainage pump 210 that discharges stagnant water to the outside.

The second drainage pump 210 may be disposed in the filter tank inlet 200 and used to discharge stagnant water remaining in the filter tank 300 to the outside after rainfall ends. To this end, the second drain pump 210 may include a second drain pipe that is connected to the second drain pump 210 and is a discharge passage for stagnant water extending to the outside.

The filtration tank 300 may be partitioned by a third side wall 13 , a fourth side wall 14 , a first partition wall 21 and a second partition wall 22 .

The second partition 22 may extend in the Y-axis direction to separate the treated water tank 400 from the filtration tank 300 .

A filter tank outlet 22a connecting the filter tank 300 and the treated water tank 400 may be formed at an upper portion of the second partition wall 22 .

The filter tank 300 may include a first filter medium layer 310, a second filter medium layer 320, a diffuser 330, and a backwash water spray nozzle 340.

The first filter medium layer 310 may be disposed at the same height as or higher than the filter tank inlet 21a, and the second filter medium layer 320 is disposed higher than the first filter medium layer 310, but the filter tank outlet 22a It can be placed lower.

Therefore, the rainwater introduced into the filter tank 300 through the filter tank inlet 21a passes through the first filter medium layer 310 and the second filter medium layer 320 in order to remove contaminants, and then passes through the filter tank outlet 22a. It can be discharged to the treatment tank 400.

The first filter medium layer 310 may include a first lower perforated plate 311 and a first upper perforated plate 312 that partition the first filter medium layer 310 .

The first upper perforated plate 312 may be disposed above the first lower perforated plate 311, and the first lower perforated plate 311 and the first upper perforated plate 312 include the first lower perforated plate 311 and the first upper perforated plate 311. A plurality of through-holes may be formed between the perforated plates 312 and have a size through which the filled filter medium cannot pass.

A first backwash wastewater discharge groove 312a having a “c” shape may be formed on the upper surface of the first upper perforated plate 312 .

Unlike other regions of the first upper perforated plate 312, no through hole may be formed in the first backwash wastewater discharge groove 312a, and both ends of the first backwash wastewater discharge groove 312a are formed on the first partition wall 21. It may be connected to the pretreatment tank 100 through the formed pair of first backwash wastewater outlets 21b.

A check valve (V) may be installed at the first backwash wastewater outlet 21b to allow only one-way flow from the filtration tank 300 to the pretreatment tank 100 and block the flow from the pretreatment tank 100 to the filtration tank 300. there is.

Therefore, as will be described later, the backwash wastewater collected in the first backwash wastewater discharge groove 312a may be discharged to the pretreatment tank 100 through the pair of first backwash wastewater outlets 21b.

The second filter medium layer 320 may include a second lower perforated plate 321 and a second upper perforated plate 322 that partition the second filter medium layer 320 .

The second upper perforated plate 322 may be disposed above the second lower perforated plate 321, and the second lower perforated plate 321 and the second upper perforated plate 322 include the second lower perforated plate 321 and the second upper perforated plate 321. A plurality of through-holes may be formed between the perforated plates 322 of a size that prevents the filled filter medium from passing therethrough.

A second backwash wastewater discharge groove 322a may be formed on the upper surface of the second upper perforated plate 322, for example, in a “c” shape.

Unlike other areas of the second upper perforated plate 322, no through hole may be formed in the second backwash wastewater discharge groove 322a, and both ends of the second backwash wastewater discharge groove 322a are formed on the first partition wall 21. It may be connected to the pretreatment tank 100 through the formed pair of second backwash wastewater outlets 21c.

A check valve (V) may be installed at the second backwash wastewater outlet 21c to allow only one-way flow from the filtration tank 300 to the pretreatment tank 100 and block the flow from the pretreatment tank 100 to the filtration tank 300. there is.

Therefore, as will be described later, the backwash wastewater collected in the second backwash wastewater outlet 322a can be discharged to the pretreatment tank 100 through the pair of second backwash wastewater outlets 21c.

Meanwhile, the first backwash wastewater discharge groove 312a and the second backwash wastewater discharge groove 322a may be formed with a slight downward slope toward the first partition wall 21 to smoothly discharge the backwash wastewater.

In addition, the first backwash wastewater discharge groove 312 and the second backwash wastewater discharge groove 322a are for easily collecting and discharging the backwash wastewater, and their shape is not limited to a “c” shape, and the filter tank 300 ) may be formed in various shapes according to the standard of the cross section, for example, aspect ratio, area, etc. For example, the first backwash wastewater discharge groove 312 and the second backwash wastewater discharge groove 322a may be formed in a “ㅡ” shape or a “T” shape and connected to one or more backwash wastewater outlets. .

The air diffuser 330 is disposed to be spaced apart from the lower side of the first filter media layer 310 and may spray air for backwashing.

To this end, the diffuser 330 may include a blower 330a connected to the diffuser 330 to supply air.

For example, as shown in FIGS. 14 and 15 , the diffuser pipe 330 may be installed so that air is discharged downward toward the bottom surface of the filtration tank 300 . As a result, accumulation of solids on the bottom surface of the filtration tank 300 can be prevented.

The backwashing water spray nozzle 340 is disposed to be spaced apart from the upper side of the second filter media layer 320 to spray backwashing water.

To this end, the backwash water spray nozzle 340 may include a backwash pump 340a connected to the backwash water spray nozzle 340 to supply backwash water. The backwashing pump 340a may be disposed in the treatment tank 400 and supply the treatment water stored in the treatment tank 400 as backwashing water.

The treatment tank 400 may be partitioned by a second side wall 12 , a third side wall 13 , a fourth side wall 14 , and a second partition wall 22 .

A treated water outlet 12a, which is a passage through which the treated water of the treated water tank 400 is discharged to the outside, may be formed at an upper portion of the second side wall 12 .

Therefore, the treated water flowing into the treated water tank 400 through the filter tank outlet 22a may be stored in a certain amount in the treated water tank 400 and then discharged to the outside through the treated water outlet 12a, and the treated water tank 400 Treated water can be stored long enough to be used as backwash water.

Meanwhile, an upper end of the overflow wall 20 may be disposed higher than the second backwash wastewater outlet 21c.

Therefore, when the filtration process is performed, the water level in the pretreatment tank 100 is formed higher than the second backwash wastewater outlet 21c, so that the water in the filtration tank 300 flows through the first backwash wastewater outlet 21b and the second backwash wastewater outlet 21c. ) through the pretreatment tank 100 is blocked by the check valve (V), while during the backwashing process, the water level of the pretreatment tank 100 rises through the first backwash wastewater outlet 21b or the second backwash wastewater outlet 21b or the second It is formed lower than the backwash wastewater outlet 21c, but the water level of the filtration tank 300 can be made higher than the first backwash wastewater outlet 21b or the second backwash wastewater outlet 21c. The backwash wastewater washing the second filter media layer 320 may be discharged to the pretreatment tank 100 through the first backwash wastewater outlet 21b or the second backwash wastewater outlet 21c.

The control unit 500 may operate the first drain pump 110 when the rainwater inflow through the rainwater inlet 13a is stopped and the backwashing process for the filtration tank 300 starts as will be described later, according to the end of the rainfall. 1 After the drain pump 110 operates, the diffuser 330 and the backwash water spray nozzle 340 according to the detection results of the first water level sensor 510, the second water level sensor 520, and the third water level sensor 530 , the first drain pump 110 and the second drain pump 210 may be controlled.

First, when the first drainage pump 110 is operated by the control unit 500, the water level in the pretreatment tank 100 can be lowered to the height of the upper end of the overflow wall 20 or less, and as a result, the water level in the filtration tank 300 When the water level rises above the level of the pretreatment tank 100, the water in the filtration tank 300 flows into the pretreatment tank 100 through the check valves V of the first backwash wastewater outlet 21b and the second backwash wastewater outlet 21c. may be discharged.

The first water level sensor 510 may detect whether or not the water level of the filtration tank 300 has reached a preset first water level.

Here, the first water level may be set higher than the upper surface of the second upper perforated plate 322 and lower than the filter tank outlet 22a, for example, set to the same height as the upper surface of the second upper perforated plate 322.

When the first water level sensor 510 detects that the water level in the filtration tank 300 has reached the first water level, the control unit 500 operates the diffuser 330, specifically, the blower 330a of the diffuser 330. to perform primary air cleaning. In this specification, operating or stopping the diffuser 330 may be interpreted as meaning operating or stopping the blower 330a of the diffuser 330 .

Meanwhile, even when the water level of the filtration tank 300 is formed at the same height as the upper surface of the second upper perforated plate 322, the water level of the filtration tank 300 is raised by the air sprayed from the air diffuser 330, thereby generating backwash wastewater. The air-desorbed wastewater may be collected into the second backwash wastewater discharge groove 322a.

When a predetermined time elapses after the first operation of the air diffuser 330, the control unit 500 operates the backwashing water spray nozzle 340, specifically the backwashing pump 340a, so that the discharge of the air-desorbed wastewater is more smooth. you can lose In this specification, operating or stopping the backwash water spray nozzle 340 may be interpreted as meaning that the backwash pump 340a of the backwash water spray nozzle 340 is operated or stopped.

At this time, the amount of backwashing water sprayed through the backwashing water spray nozzle 340 is equal to or similar to the amount of backwashing water discharged through the pair of first backwashing wastewater outlets 21b and the pair of second backwashing wastewater outlets 21c. Alternatively, it may be equal to or similar to the amount of drainage through the first drainage pump 110.

The control unit 500 may stop the diffuser 330 and the backwash water spray nozzle 340 when the primary air cleaning is completed.

The second water level sensor 520 may detect whether the water level of the filtration tank 300 has reached a predetermined second water level.

Here, the second water level may be set higher than the upper surface of the first upper perforated plate 312 and lower than the lower surface of the second lower perforated plate 321, for example, set to the same height as the upper surface of the first upper perforated plate 312. It can be.

When the second water level sensor 520 detects that the water level in the filtration tank 300 has reached the second water level, the control unit 500 may operate the diffuser 330 to perform secondary air cleaning.

Meanwhile, even when the water level of the filtration tank 300 is formed at the same height as the upper surface of the first upper perforated plate 312, the water level of the filtration tank 300 is raised by the air sprayed from the air diffuser 330, thereby generating backwash wastewater. Air desorption wastewater may be collected in the first backwash wastewater discharge groove 312a.

The control unit 500 may operate the backwashing water spray nozzle 340 when a predetermined time elapses after the second operation of the diffuser 330, so that the air-separated wastewater can be discharged more smoothly.

At this time, the amount of backwashing water sprayed through the backwashing water spray nozzle 340 is equal to or similar to the amount of backwashing wastewater discharged through the pair of first backwashing wastewater outlets 21b, or the amount of discharge through the first drain pump 110. may be the same as or similar to

When the secondary air washing is completed, the control unit 500 may stop the diffuser 330 and the backwash water spray nozzle 340 while operating the second drain pump 210 .

The third water level sensor 530 may detect whether the water level of the filtration tank 300 has reached a preset third water level.

Here, the third water level may be set lower than the first upper perforated plate 312, and may be preferably set adjacent to the first lower perforated plate 311.

When the third water level sensor 530 detects that the water level in the filtration tank 300 has reached the third water level, the controller 500 operates the backwash water spray nozzle 340 to perform water washing.

In this way, water washing is performed after lowering the water level of the filtration tank 300 from the vicinity of the first upper perforated plate 312 to the vicinity of the first lower perforated plate 311 so that the water level of the filter tank 300 is lowered to the original water level by spraying backwashing water. , For example, to prevent backwash wastewater from being higher than the water level of the pretreatment tank 100 and directly discharged to the pretreatment tank 100 through the first backwash wastewater discharge groove 312a without passing through the first filter media layer 310 can be To this end, while the water level of the filtration tank 300 is lowered by operating the second drain pump 210, the water level of the pretreatment tank 100 is higher than that of the filtration tank 300 by stopping the operation of the first drain pump 110. It may be desirable to retain

When water washing is completed, the control unit 500 may stop the backwash water injection nozzle 340 and operate the first drain pump 110 and the second drain pump 210 to operate the pretreatment tank 100 and the filtration tank 300. ) may perform a stagnant water drainage process for discharging stagnant water to the outside.

9 and 10 are diagrams showing a filtration process of the upflow filtering non-point pollution reduction facility of FIG. 1 .

Referring to FIG. 9 , rainwater may flow into the pretreatment tank 100 through the rainwater inlet 13a during rainfall, flow into the filter tank inlet 200 through the overflow wall 20, and the first partition wall. It is introduced into the filter tank 300 through the filter tank inlet 21a formed at the bottom of the filter 21 and can be filtered while passing through the first filter medium layer 310 and the second filter medium layer 320 in turn. The treated water thus treated may flow into the treated water tank 400 through the filtration tank outlet 22a formed on the upper portion of the second partition wall 22, and the treated water outlet 12a formed on the upper portion of the second side wall 12. ) can be discharged to the outside.

Referring to FIG. 10 , as rainfall and subsequent filtration process continue, the amount of particulate contaminants trapped in the first filter medium layer 310 and the second filter medium layer 320 gradually increases, As the head loss of the filter 310 and the second filter media layer 320 gradually increases, the water level of the pretreatment tank 100 and the filter tank inlet 200 may be higher than that of the filter tank 300 .

FIG. 11 is a diagram showing a backwashing method of the upflow filtering nonpoint pollution abatement facility of FIG. 1 , and FIGS. 12 to 17 are diagrams for explaining each step of the backwashing method of FIG. 11 .

Referring to FIG. 11, the backwashing method of the upflow filtering nonpoint pollution reduction facility 10 according to an embodiment of the present invention includes a pretreatment tank drainage step (S100), a first air cleaning step (S110), and a secondary air It may include a washing step (S120), a filter tank draining step (S130), a water washing step (S140) and a stagnant water draining step (S150).

First, when a predetermined time elapses after the rain ends, as shown in FIG. 12 , the water levels of the pretreatment tank 100 and the filtration tank 300 may be lowered to the same height as the lower end of the filtration tank outlet 22a.

Next, as shown in FIG. 13, as the first drain pump 110 is operated to drain the stagnant water in the pretreatment tank 100 to the outside, the water level in the pretreatment tank 100 rises above the overflow wall 20. As a result, the check valve V is opened so that the water in the filtration tank 300 can be discharged to the pretreatment tank 100 through the first backwash wastewater outlet 21b and the second backwash wastewater outlet 21c. Yes (S100).

Next, as shown in FIG. 14, when the water level in the filtration tank 300 reaches a predetermined first level as the water level in the pretreatment tank 100 decreases, the air diffuser 330 is operated to perform primary air cleaning. It can (S110).

In addition, the backwash water spray nozzle 340 may be operated when a predetermined time elapses after the first operation of the diffuser 330.

In this case, the amount of backwashing water sprayed through the backwashing water spray nozzle 340 is equal to or greater than the amount of backwashing water discharged through the pair of first backwashing wastewater outlets 21b and the pair of second backwashing wastewater outlets 21c. It may be similar or the same as or similar to the amount of drainage through the first drainage pump 110 .

In addition, when a predetermined time elapses after the secondary operation of the backwash water spray nozzle 340, the diffuser 330 and the backwash water spray nozzle 340 may be stopped.

Next, as shown in FIG. 15, when the water level in the filtration tank 300 reaches the predetermined second water level according to the additional water level in the pretreatment tank 100, the diffuser 330 is operated to perform secondary air washing. It can (S120).

In addition, the backwash water spray nozzle 340 may be operated when a predetermined time elapses after the secondary operation of the diffuser 330.

In this case, the amount of backwashing water sprayed through the backwashing water spray nozzle 340 is equal to or similar to the amount of backwashing water discharged through the pair of first backwashing wastewater outlets 21b, or through the first drainage pump 110. It can be the same as or similar to the displacement.

In addition, when a predetermined time elapses after the secondary operation of the backwash water spray nozzle 340, the diffuser 330 and the backwash water spray nozzle 340 may be stopped.

Next, as shown in FIG. 16, the second drain pump 210 may be operated (S130), and the water level of the filtration tank 300 is lowered by the operation of the second drain pump 210 to a predetermined third water level. When it reaches , water washing may be performed by operating the backwash water spray nozzle 340 (S140).

In this way, water washing is performed after lowering the water level of the filtration tank 300 from the vicinity of the first upper perforated plate 312 to the vicinity of the first lower perforated plate 311 so that the water level of the filter tank 300 is lowered to the original water level by spraying backwashing water. , For example, to prevent backwash wastewater from being higher than the water level of the pretreatment tank 100 and directly discharged to the pretreatment tank 100 through the first backwash wastewater discharge groove 312a without passing through the first filter media layer 310 can be To this end, while the water level of the filtration tank 300 is lowered by operating the second drain pump 210, the water level of the pretreatment tank 100 is higher than that of the filtration tank 300 by stopping the operation of the first drain pump 110. It may be desirable to retain

Next, as shown in FIG. 17, the first drain pump 110 and the second drain pump 210 may be operated to discharge all of the stagnant water in the pretreatment tank 100 and the filtration tank 300 to the outside ( S150).

In the above, the preferred embodiment of the present invention has been described, but this is only an example and does not limit the present invention. Those skilled in the art to which the present invention pertains can modify and change the embodiments in various ways by adding, changing, deleting, or adding components within the range that does not deviate from the spirit of the present invention described in the claims. It will be possible, and this will also be said to be included within the scope of the present invention.

10: non-point pollution abatement facility 11: first side wall
12: second side wall 12a: treated water outlet
13: third side wall 13a: rainwater inlet
14: fourth side wall 20: overflow wall
21: first bulkhead 21a: filter tank inlet
21b: first backwash wastewater outlet 21c: second backwash wastewater outlet
22: second partition wall 22a: filter tank outlet
100: pretreatment tank 110: first drain pump
120: diaphragm 200: filter tank inlet
210: second drainage pump 300: filtration tank
310: first filter layer 311: first lower perforated plate
312: first upper perforated plate 312a: first backwash wastewater discharge groove
320: second filter layer 321: second lower perforated plate
322: second upper perforated plate 322a: second backwash wastewater discharge groove
330: diffuser 330a: blower
340: backwash water injection nozzle 340a: backwash pump
400: treatment tank 500: control unit
510: first water level sensor 520: second water level sensor
530: third water level sensor

Claims (8)

A pretreatment tank having a rainwater inlet and a first drain pump discharging stagnant water to the outside;
a filtration tank inlet separated from the pretreatment tank by an overflow wall so that rainwater overflows and flows in from the pretreatment tank and includes a second drain pump for discharging stagnant water to the outside;
a filtration tank separated from the pretreatment tank and the filtration tank inlet by a first partition wall; and
A treated water tank separated from the filtration tank by a second partition wall and having a treated water outlet,
The first partition wall has a filter tank inlet at a lower portion connecting the filter tank inlet and the filter tank,
The second partition wall has a filter tank outlet connecting the filter tank and the treated water tank at an upper portion,
The filter tank includes a first filter medium layer disposed higher than the filter tank inlet, a second filter medium layer disposed above the first filter medium layer but disposed lower than the filter tank outlet, and spaced apart below the first filter medium layer, a diffuser pipe for spraying air for backwashing, and backwashing water spray nozzles spaced apart from each other above the second filter media layer and spraying backwashing water;
The first filter medium layer includes a first lower perforated plate partitioning the first filter medium layer, and a first upper perforated plate disposed above the first lower perforated plate and spaced apart to partition the first filter medium layer,
A first backwash wastewater discharge groove is formed on the upper surface of the first upper perforated plate, and discharge ends at both ends of the first backwash wastewater discharge groove are connected to the pretreatment tank through a pair of first backwash wastewater outlets formed in the first partition wall. become,
The second filter medium layer includes a second lower perforated plate partitioning the second filter medium layer, and a second upper perforated plate disposed above the second lower perforated plate and spaced apart to partition the second filter medium layer,
A second backwash wastewater discharge groove is formed on the upper surface of the second upper perforated plate, and both end discharge ends of the second backwash wastewater discharge groove are connected to the pretreatment tank through a pair of second backwash wastewater outlets formed in the first partition wall. become,
Check valves are installed at the pair of first backwash wastewater outlets and the pair of second backwash wastewater outlets to allow only one-way flow from the filtration tank to the pretreatment tank;
The overflow wall extends in a first horizontal direction, and the first partition wall and the second partition wall each extend in a second horizontal direction perpendicular to the first horizontal direction, so that the
The pretreatment tank and the inlet of the filter tank are arranged in line in the second horizontal direction and contact each other on one side, the filter tank is in contact with the other side of the first partition wall, and the filter tank and the treatment water tank are in contact with both sides of the second partition wall. It is made of a compact structure in the shape of a rectangular parallelepiped as a whole,
a first water level sensor for detecting whether or not the water level of the filter tank has reached a predetermined first water level that is higher than the upper surface of the second upper perforated plate and lower than the lower end of the outlet of the filter tank;
a second water level sensor for detecting whether or not the water level in the filtration tank reaches a predetermined second water level that is higher than the upper surface of the first upper perforated plate and lower than the lower surface of the second lower perforated plate;
a third water level sensor for detecting whether or not the water level of the filtration tank has reached a predetermined third water level lower than that of the first upper perforated plate; and
When the inflow of rainwater through the rainwater inlet is stopped and the backwashing process for the filter tank starts, the first drain pump is operated, and after the first drain pump is operated, the first water level sensor, the second water level sensor, and the A control unit controlling the diffuser, the backwash water spray nozzle, the first drain pump, and the second drain pump according to a detection result of a third water level sensor is further included.
Upflow filtering type non-point pollution reduction facility, characterized in that for.
delete According to claim 1,
The rainwater inlet is formed on a side wall facing the overflow wall in the second horizontal direction,
The pretreatment tank includes a diaphragm arranged so that rainwater introduced through the rainwater inlet collides with it;
The diaphragm extends in the first horizontal direction and is arranged to be spaced upward from the bottom surface of the pretreatment tank.
According to claim 1,
An upflow filtering type non-point pollution reduction facility, characterized in that the upper end of the overflow wall is disposed higher than the second backwash wastewater discharge port. In the backwashing method for the filter medium layer of the upflow filtering non-point pollution reduction facility according to claim 1,
draining the pretreatment tank by operating the first drainage pump when the rainwater inflow through the rainwater inlet is stopped;
When the first water level sensor detects that the water level in the filtration tank reaches a predetermined first water level that is equal to or higher than the upper surface of the second upper perforated plate and lower than the lower end of the filter tank outlet, the control unit operates the diffuser. air washing step;
When the second water level sensor detects that the water level in the filtration tank reaches a predetermined second water level that is higher than the upper surface of the first upper perforated plate and lower than the lower surface of the second lower perforated plate, the control unit operates the diffuser. a second air cleaning step;
a filter tank drainage step of operating the second drain pump when the secondary air washing step is completed;
a water washing step in which the control unit operates the backwash water spray nozzle when the third water level sensor detects that the water level in the filter tank has reached a predetermined third level lower than the lower surface of the first lower perforated plate; and
and a stagnant water draining step of operating the first drain pump and the second drain pump when the water washing is completed,
In the first air cleaning step and the second air cleaning step,
Further comprising the step of operating the backwash water spray nozzle when a predetermined time elapses after the operation of the diffuser
Backwashing method of upflow filtering non-point pollution abatement facility.
delete According to claim 5,
In the first air cleaning step and the second air cleaning step,
The amount of backwash water sprayed through the backwash water spray nozzle is equal to the amount of backwash wastewater discharged through the pair of first backwash wastewater outlets or the pair of second backwash wastewater outlets. Methods of backwashing abatement plants.
According to claim 7,
In the first air cleaning step and the second air cleaning step,
The backwashing method of the upflow filtering type nonpoint pollution reduction facility, characterized in that the injection amount of the backwashing water sprayed through the backwashing water spray nozzle is the same as the amount of discharge through the first drain pump.

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