KR20160048500A - Perforated drain pipe for back-washing wastewater, and dissolved air flotation type water treatment apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous drainage pipe for drainage of backwashing wastewater and a dissolved air floating water treatment device including the same. More particularly, the present invention relates to a backwashing process, which is essential in a filtration process using a media, The present invention relates to a perforated drain pipe capable of effectively collecting and discharging backwashing wastewater generated due to the backwashing wastewater and minimizing the loss of the filter medium, and a dissolved air floating type water treatment apparatus including the same.
According to the present invention, backwashing of backwashing wastewater can be facilitated while preventing leakage of the filter medium, backwashing can be performed at a sufficient speed to perform efficient backwashing, and backwashing wastewater collected without additional power And can be transferred to the collecting tank in the downstream through the downflow method, which is more economical.

Description

TECHNICAL FIELD [0001] The present invention relates to a perforated drain pipe for drainage of backwashing wastewater, and a dissolved air flotation type water treatment device including the same. BACKGROUND OF THE INVENTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous drainage pipe for drainage of backwashing wastewater and a dissolved air floating water treatment device including the same. More particularly, the present invention relates to a backwashing process, which is essential in a filtration process using a media, The present invention relates to a perforated drain pipe capable of effectively collecting and discharging backwashing wastewater generated due to the backwashing wastewater and minimizing the loss of the filter medium, and a dissolved air floating type water treatment apparatus including the same.

In the filtration process using media, backwashing with air or water is indispensable, and backwashing wastewater generated in the backwashing process must be collected and transported.

Conventionally, in Korean Patent Publication No. 1156125 (published on June 20, 2012, 'Diffusion type pretreatment apparatus for dissolved air'), a concrete trough or a tray is formed in the upper part of the area filled with the lower tank of the tank, The backwash wastewater was collected and guided to the backwash water gate formed on the outer wall of the water tank.

However, since such troughs and trays can not completely prevent the loss of the filter medium, there is an economical burden on the cost of supplementing the filter medium, and due to the deterioration of the filtration function due to the loss of the filter medium, a leakage accidentally occurs in the backwash water There was a possibility.

On the other hand, a hood equipped with a driving motor is not provided in the lower part of the water tank through a trough or a tray under the control of Korean Patent Registration No. 1271089 (published on Jun. 12, 2013, 'Porous plate device of an automatic back- And a method of sucking and removing the water by a separate device installed outside the water tank is also proposed.

However, when the backwashing wastewater is collected and transported with such a backwashing wastewater aspiration device, additional installation cost, power supply cost, and the like are required, thereby increasing the CAPEX and OPEX of the entire facility.

Korean Registered Patent No. 1156125 (issued on June 20, 2012, 'Dedicated Air Flotation Pretreatment Apparatus') Korean Patent Publication No. 1271089 (published on June 12, 2013, entitled "Porous Plate Device of Automatic Backfeed Filter")

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water treatment apparatus utilizing a filter material requiring a backwashing process, which facilitates backwashing discharge and improves backwashing efficiency, The present invention provides a perforated drain pipe capable of easily transferring backwashing wastewater through a natural descending method without any additional power and a dissolved air floating type water treatment apparatus including the same.

According to an embodiment of the present invention, there is provided a filtration unit (10) filled with a plurality of filter media (11) to filter pollutants of raw water, (20) for collecting and discharging backwashing wastewater generated in backwashing of the filter material (11) in the filtration tank (1), the drainage pipe (20) Washing wastewater collected through the one side of the inner wall of the filtration tank 1 and collected in the wastewater collecting tank 30 is supplied to the upper part of the filtration unit 10, Wherein the backwashing wastewater is guided by a plurality of backwashing wastewater.

In this case, the material of the drain pipe 20 is preferably glassfiber reinforced plastic (GRP), and the drain pipe 21 is connected to the left and right sides 30 Deg.] To 60 [deg.].

The drain pipe 20 may be fixed to the upper surface of the concrete slab 22 provided at the upper portion of the filtration unit 10. The drain pipe 20 may be connected to one side of the inner wall of the filtration tank 1 And at least one water intake pipe 20b communicating with the transfer pipe 20a and provided in the normal direction of the transfer pipe 20a.

In addition, the drainage pipe (20) is provided such that the area (1a) side is lower than the opposite side so that the backwashing wastewater collected in the direction of the region (1a) connected to one side of the inner wall of the filtration tank .

In order to achieve the above-mentioned object, according to another embodiment of the present invention, in order to remove contaminants such as suspended substances, contaminants or alien substances contained in raw water, dissolved air A Dissolved air floatation (DAF) water treatment system (A), comprising: a plurality of first and second filters A filtration part (10) filled with a filter material (11); And a drain pipe 20 provided in the flotation tank 1 for collecting and discharging backwashing wastewater generated by back-washing of the filter medium 11 installed on the filtration unit 10, The drainage pipe 20 is formed with a plurality of water intake openings 21 on its surface and is connected to one side of the inner wall of the floatation vessel 1 to collect the collected backwashing wastewater into the waste water collection tank 30 Wherein the water-treatment system is a water-treatment system.

In this case, it is preferable that the material of the water pipe 20 is glassfiber reinforced plastic (GRP), and the water inlet 21 is located at a distance of 30 ° from both sides of the lowest point on the outer circumference in the longitudinal direction of the water pipe 20 To 60 [deg.] Point.

The drain pipe 20 may be fixed to the upper surface of the concrete slab 22 provided on the upper portion of the filtration unit 10. The drain pipe 20 may be connected to one side of the inner wall of the floating tank 1, And at least one water intake pipe 20b communicating with the transfer pipe 20a and provided in the normal direction of the transfer pipe 20a.

In addition, the drainage pipe 20 is installed so that the area 1a is lower than the opposite side so that the backwashing wastewater collected in the direction of the area 1a connected to one side of the inner wall of the floating tank 1 is naturally discharged And may further include a filter material loss prevention part 12 formed of a porous plate material to prevent the filter material 11 from being released to the outside through the upper part of the filtration part 10.

The porous drain pipe for drainage of the backwashing wastewater of the present invention and the dissolved air floating water treatment device including the same as described above can prevent backwashing of the filter material and facilitate the discharge of the backwashing wastewater, It is possible to perform efficient backwashing and the backwashing wastewater collected without any additional power can be transferred to the collecting tank at the rear end through the natural descent method, which is more economical.

1 is a plan view showing a state in which a perforated drain pipe 20 of the present invention is installed.
2 is a cross-sectional view taken along line AA 'of FIG.
3 is a side view showing a state of the filtration tank 1 in which the perforated drain pipe 20 of the present invention is installed.
4 is a process schematic diagram of a dissolved air floating type water treatment apparatus (A) in which a perforated drain pipe (20) of the present invention is provided below a floating tank (1).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when a member is " on " another member, this includes not only when the member is in contact with another member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In the present invention, first, a filtration part (10) filled with a plurality of filter materials (11) is provided inside a filtration tank (1) for filtering contaminants of raw water according to a preferred embodiment, And provides a drain pipe 20 for collecting and discharging backwashing wastewater generated by back-washing. A top view of the drain pipe 20 according to one embodiment of the present invention is shown in Fig. 1, and a sectional view taken along the line AA 'in Fig. 1 is shown in Fig.

The present invention can be applied to an apparatus for performing water treatment through a filtration unit 10 in which a plurality of filter media 11 are packed. Preferably, the filter is a Dissolved Air Flotation (DAF) The present invention can be applied to a DABF (Dissolved Air Flotation with Ball Filter) system in which a filtration unit 10 in which a ball filter filter medium 11 is filled is provided below a floating tank 1 of a water treatment apparatus A.

The drain pipe 20 is connected to the flotation tank 1 of the DAF water treatment apparatus A and the flotation tank 1 for performing the filtration process using the filter medium and the floating tank 1 of the DAF water treatment apparatus A ) Which is provided in the upper part of the filtration unit 10 which is an area filled with the filter medium 11 and is formed through pressurized water or air bubbles upwardly applied from the bottom for backwashing And collects and transports the backwashing wastewater from the upper part of the filtration unit 10.

The drain pipe (20) of the present invention is preferably a perforated drain pipe in which a plurality of water intake openings (21) are formed on the surface. And the backwashing wastewater is collected through the water intake port 21 formed on the surface thereof and is collected while the filter medium 11 floated upward due to backwashing is not introduced. As a result, it is possible to prevent leakage of the filter material 11, and the backwashing strength can be adjusted within a wide range, thereby enabling highly efficient backwashing. The intake port 21 may be formed in a slit shape to minimize the outflow of the filter medium while enhancing the drainage efficiency, or may be formed more densely in the form of a hole to further improve the drainage efficiency. In particular, in the case of a drain pipe 20 made of a glass fiber reinforced plastic material as described later, it is more effective to provide the drain pipe 21 in the form of a hole.

1, the drainage pipe 20 of the present invention is connected to the region 1a on one side of the inner wall of the filtration tank 1 so that the backwashing wastewater collected through the water intake 21 is discharged to the outside of the filtration tank 1 To the collecting tank (30). The material of the water pipe 20 of the present invention is formed of glass fiber reinforced plastic (GRP) so that it is easy to form the water inlet 21 on the surface of the water pipe 20 and is easy to install and maintain. .

2, it is preferred that the water intake 21 formed on the surface of the water pipe 20 is formed in an upper region 30 ° to 60 ° from both sides of the water pipe 20 on the basis of the lowest point on the outer periphery of the longitudinal direction of the water pipe 20 Do. In other words, it is preferable that the intake port 21 is not formed in the lower 60 to 120 ° area of the pipe, and the intake port 21 is formed only in the upper 240 to 300 ° area of the pipe. Thus, when the backwashing wastewater is filled in the region where the drain pipe 20 is formed at a predetermined level or more through the backwashing process, the backwashing wastewater is collected through the water intake port 21, and at the same time, The collected backwashing wastewater can be transferred to the wastewater collecting tank 30 without flowing back to the outside.

In addition, the drainage pipe 20 of the present invention is arranged such that the region 1a is located on the opposite side from the opposite side so that the wastewater collected in the direction of the region 1a connected to the drainage pipe 20 through the inner wall of the filtration tank 1 is naturally discharged. It is desirable to install it at a low level. 3 to 4, it can be confirmed that the water pipe 20 is installed to have a predetermined inclination. As a result, the backwashing wastewater collected without any additional power can be naturally discharged to the downstream wastewater collecting tank 30, thereby reducing the OPEX of the water treatment process, which is economical.

The drain pipe 20 of the present invention is preferably fixed to the upper surface of the concrete slab 22 provided on the upper portion of the filtration unit 10 as shown in FIGS. At this time, the concrete slab 22 is not provided on the upper part of the upper part of the filtration part 10 but is limited to the area necessary for fixing the water pipe 20 as shown in FIG. 1, The washing wastewater is filled in the upper part.

A drain pipe 20 is fixedly installed on the upper surface of the concrete slab 22. The concrete pipe 22 is fixed to the concrete slab 22 by an anchor 23 with respect to the joint portion formed in the process of assembling and installing the GRP- .

The drain pipe 20 according to the present invention includes a transfer pipe 20a connected to one side of the inner wall of the filtration tank 1 and at least one water intake pipe 20a connected to the pipe 20a in the normal direction of the transfer pipe 20a 20b. May be configured in the '+' form as shown in FIG. It is preferable that the transfer pipe 20a and the water intake pipe 20b are provided with a water intake 21 and the backwash water collected through the water intake pipe 20b is collected at the center and collectively collected into the water collection tank 30 It is preferable that the diameter of the central transfer pipe 20a is larger than the diameter of the water intake pipe 20b.

Next, the present invention is a DAF water treatment apparatus (A) including a float tank (1) capable of removing contaminants such as floating matters, contaminants, algae, etc. contained in raw water according to another preferred embodiment, A filtration unit 10 provided below the floating tank 1 and filled with a plurality of filter media 11 for filtering contaminants remaining in the treated water in which pollutants are primarily removed from the raw water, And a drain pipe 20 provided in the upper portion of the filtration unit 10 for collecting and discharging the backwashing wastewater generated in the backwashing process of the filter material 11. A schematic diagram of the DAF water treatment apparatus (A) of the present invention is shown in Fig.

By introducing the filtration unit 10 filled with the ball filter medium 11 into the lower portion of the float tank 1 in a general DAF facility, it is possible to reduce the installation space and facilitate maintenance, thereby reducing CAPEX and OPEX, It is possible to more effectively and thoroughly remove contaminants such as suspended solids, sediment and algae contained in raw water such as sewage or wastewater, and it is possible to perform backwashing conveniently.

In addition, the backwashing wastewater generated during backwashing can be effectively collected and discharged through the water pipe 20 provided in the upper part of the filtration unit 10 as described above, thereby maximizing the filtration efficiency.

The ball filter medium 11 used in the DABF (Dissolved Air Flotation with Ball Filter) system is formed of, for example, a core member made of an aluminum alloy and having an outer surface coated with a plastic material, And may be made of fiber yarn such as fixed polypropylene (PP), polyethylene (PE), or polyvinylidene fluoride (PVDF).

The treated water passing through the pretreatment chamber of the flocculation tank, the settling tank, the mixing tank, etc. (2,3) comes into contact with the minute bubbles supplied from the contact basin of the float tank (1) The treated water from which the substance has been removed passes through the filtration unit 10 in the lower portion of the float tank 1 filled with the filter medium 11, and further the contaminants are removed and transferred to the treated water storage tank 4 at the downstream stage.

A lower support 13 such as a pore block or a strainer is provided on the lower portion of the filtration unit 10 to support the filter medium 11 while preventing the ball filter medium 11 from being released to the outside through the lower portion The upper portion of the filtration unit 10 may be provided with an additional filter material loss prevention unit 12 such as a porous panel to prevent the filtration material 11 from being separated upward due to backwash. The leakage of the filter medium 11 can be prevented to some extent if the filtration material loss prevention part 12 is separately provided between the filtration part 10 and the water discharge pipe 20. Therefore, May be made larger.

On the other hand, if the use of the drain pipe 20 is unnecessary for a certain period of time, such as when the concentration of contaminants in the raw water is within a sufficiently acceptable range by itself of the DAF system or when backwashing of the filter material 11 is not needed for a while The water inlet 21 formed on the surface of the water pipe 20 can be blocked to prevent water from flowing into the water pipe 20. [

Hereinafter, embodiments of the porous drain pipe for draining the backwashing wastewater of the present invention and the dissolved air floating water treatment device including the same will be described. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. shall.

An embodiment of the backwashing process performed in the float tank 1 provided with the drain pipe 20 of the present invention will be described.

The inflow gate and the circulating water injection valve of the flotation tank 1 in the DAF water treatment apparatus A to be backwashed are closed and the water in the flotation tank 1 is drained. At this time, the drainage level in the float tank 1 is up to the upper portion of the filtration unit 10 (the lower portion of the drain pipe 20 of the present invention) and drained in conjunction with the water level meter installed in the floating tank 1.

When drainage in the float tank (1) is completed, backwashing is performed on the filter material (11). Specifically, the sludge discharge valve connected to the outside of the drain pipe 20 is closed, the backwash air valve is opened to perform air backwash first, then the backwash air valve is closed and the backwash water valve is opened to perform water backwashing Conduct. Thereafter, the sludge discharge valve connected to the drain pipe 20 is opened to discharge the backwash water. The above backwashing procedure is roughly followed by 2 minutes and 30 seconds of offensive, 5 minutes of flushing, 2 minutes and 30 seconds of offensive, and 5 minutes of flushing.

The backwashing wastewater collected and transported through the drain pipe 20 naturally flows down to the wastewater collecting tank 30 together with the scum sludge collected at the upper portion of the float tank 1 and then intermittently flows through the sludge transport pump to the downstream water treatment system And processed.

The present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such modifications are within the scope of protection of the present invention.

A: Dissolved air floating type water treatment device
1: Filtration tank, floating tank
1a: an area connected to one side of the inner wall of the filtration tank (flotation tank)
2: Coagulation tank
3: Settling tank
4: treated water storage tank
10:
11: Filter medium
12: Filter material loss prevention part
13: Lower support
20: Water pipe
20a:
20b: intake pipe
21: Water intake
22: Concrete slab
23: Anchor
30: Wastewater collection tank

Claims (13)

A filtration unit (10) filled with a plurality of filter media (11) is provided inside the filtration tank (1) for filtering contaminants of raw water. The filter medium (11) ) For collecting and discharging backwashing wastewater,
The drainage pipe 20 is provided in the filtration tank 1 and is provided on the filtration unit 10 and has a plurality of water intake holes 21 formed on the surface thereof and connected to one side of the inner wall of the filtration tank 1 And the collected backwashing wastewater is guided to the wastewater collection tank (30). The method according to claim 1,
Wherein the material of the drain pipe (20) is glassfiber reinforced plastic (GRP). The method according to claim 1,
Wherein the water intake port (21) is formed in an upper region of both 30 ° and 60 ° from both sides of the lowest point on the outer circumference of the cross section of the water pipe (20) in the longitudinal direction of the water pipe (20). The method according to claim 1,
Wherein the drain pipe (20) is fixed to an upper surface of a concrete slab (22) provided on the upper part of the filtration unit (10). The method according to claim 1,
The drain pipe 20 is connected to one side of the inner wall of the filtration tank 1 and includes a transfer pipe 20a communicated with the transfer pipe 20a and having at least one water intake pipe 20a provided in the normal direction of the transfer pipe 20a, And a pipe (20b). ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the area of the drainage pipe (20) is lower than the area on the opposite side so that the backwashing wastewater collected in the direction of the area (1a) connected to one side of the inner wall of the filtration tank (1) Perforated drain pipes for drainage of backwash wastewater. 1. A dissolved air floatation (DAF) water treatment apparatus (A) including a floating tank (1) capable of removing contaminants such as floating substances, contaminants and algae contained in raw water,
A filtration unit 10 provided below the flotation tank 1 and filled with a plurality of filter media 11 for filtering residual contaminants in the treated water from which the contamination is primarily removed from the raw water; And
And a drain pipe 20 provided in the floating tank 1 for collecting and discharging backwashing wastewater generated by back-washing of the filter material 11 installed on the filtration unit 10 In addition,
The drainage pipe 20 is formed with a plurality of water intake openings 21 on its surface and connected to the one side of the inner wall of the floatation tank 1 to collect the collected backwashing wastewater into the waste water collection tank 30. [ Dissolved air floating type water treatment device. The method of claim 7,
Wherein the material of the water pipe (20) is glassfiber reinforced plastic (GRP). The method of claim 7,
Wherein the water intake port (21) is formed at an upper region of both sides of 30 ° to 60 ° from the lowest point on the outer circumference of the cross section in the longitudinal direction of the water pipe (20). The method of claim 7,
Wherein the drain pipe (20) is fixedly installed on the upper surface of the concrete slab (22) provided on the upper part of the filtration unit (10). The method of claim 7,
The drain pipe 20 is connected to one side of the inner wall of the floating tank 1. The drain pipe 20 is connected to the one side of the floating tank 1 and is connected to the transfer pipe 20a, And a water intake pipe (20b). The method of claim 7,
The drainage pipe 20 is installed such that the backwashing wastewater collected in the direction of the region 1a connected to the one side of the inner wall of the floating tank 1 is naturally discharged, Dissolved air floating type water treatment device. The method of claim 7,
Further comprising a filter material loss prevention part (12) provided with a porous plate to prevent the filter material (11) from being released to the outside through the upper part of the filtration part (10) .

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