KR20200140656A - Half-pipe skimmer and water treatment device having the same - Google Patents

Abstract

The present invention relates to a half-pipe type skimmer and a water treatment device comprising the same capable of efficiently removing a float, wherein the skimmer is included in the water treatment device using a dissolved air flotation method, and comprises a basket immersed in the water to be treated contained in a floating tank and receiving contaminants floating to a water surface, the basket is extended so as to cross the floating tank at the rear end of the floating tank, and at the bottom of the basket, a discharge port for discharging the received sludge is formed.

Description

A half-pipe skimmer and a water treatment device including the same TECHNICAL FIELD [HALF-PIPE SKIMMER AND WATER TREATMENT DEVICE HAVING THE SAME]

The present invention relates to a semi-pipe type skimmer and a water treatment apparatus including the same.

Physical and chemical treatment processes such as flocculation, sedimentation or flotation, filtration and disinfection can be used as water treatment process technology. Specifically, it may be performed in the order of coagulation-precipitation-filtration or coagulation-floating-filtration.

Here, the flotation method of condensing and floating suspended substances in the water is to generate and inject small air bubbles when there are more substances that are lighter than water in the water, and the agglomerated solid mass (flock) is raised by the buoyancy of light bubbles. I say how to do it. The flotation method can be divided into the air-flotation method, the dissolved air-flotation method (DAF), and the vacuum flotation method.

In particular, the Dissolved Air Flotation (DAF) is a process of floating and removing particles in water using microbubbles. Float formed by combining microbubbles and flocs accumulates on the water surface, which is continuously or intermittently removed by a collecting device.

A collection device for collecting floats floated in the dissolved air levitation method has been developed in various ways, and the inventor of the present invention has completed the present invention after a long study and trial and error for an effective float collection device.

It is an object of the present invention to provide a half-pipe type skimmer capable of efficiently removing floats in a water treatment device using a dissolved air levitation method, and a water treatment device including the same.

Still other objects, not specified, of the present invention will be additionally considered within the range that can be easily deduced from the following detailed description and effects thereof.

According to an aspect of the present invention, in a skimmer included in a water treatment apparatus using a dissolved air flotation method, a basket for receiving contaminants floating to the surface by being immersed in water to be treated accommodated in the floating tank is provided. Including, wherein the basket is extended to cross the floating tank at a rear end of the floating tank, and a discharge port for discharging the accommodated sludge is formed at the bottom of the basket, a half-pipe type skimmer is provided.

The basket may be elevating in a direction perpendicular to the water surface.

A rotation shaft installed above the basket and extending in a longitudinal direction of the basket; And a connection part connecting the rotation shaft and the basket, and the basket may be raised or lowered according to the rotation of the rotation shaft.

A gear coupled to the rotation shaft; And

A holder coupled to both ends of the basket may further be included, and the connection portion may include a chain coupled to the holder to mesh with the gear.

A guide rod installed on the inner wall of the floating tank to extend in the lifting direction of the basket; And holders coupled to both ends of the basket so as to move up and down with respect to the guide rod.

The height of the basket may be adjusted according to the level of water to be treated in the floating tank.

It may further include a hose coupled to the outlet to discharge the pollutants.

According to another aspect of the present invention, there is provided a water treatment apparatus using a dissolved air flotation method, comprising: a flotation tank for receiving water to be treated and receiving fine bubbles to float pollutants; And a half-pipe type skimmer installed in the floating tank, wherein the semi-pipe type skimmer corresponds to one of claims 1 to 7, and a water treatment device is provided.

According to an embodiment of the present invention, it is possible to effectively remove contaminants contained in water to be treated.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effect described in the following specification and its provisional effect expected by the technical features of the present invention are treated as described in the specification of the present invention.

1 and 11 are views showing a water treatment apparatus according to an embodiment of the present invention.
2 to 5 are views showing a half-pipe type skimmer according to an embodiment of the present invention.
6 and 7 are views showing a sludge discharge process of a half-pipe type skimmer according to an embodiment of the present invention.
8 is a view showing the vertical movement of the half-pipe type skimmer according to an embodiment of the present invention.
9 and 10 are views showing the operation of the half-pipe type skimmer according to an embodiment of the present invention.
The accompanying drawings are exemplified by reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereto.

In describing the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured as matters obvious to those skilled in the art with respect to known functions related to the present invention, detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Hereinafter, a half-pipe type skimmer and a water treatment device including the same according to the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numbers. A redundant description of this will be omitted.

1 and 11 are views showing a water treatment apparatus according to an embodiment of the present invention.

The water treatment apparatus according to an embodiment of the present invention includes a plurality of water tanks, and a state capable of finally discharging the water to be treated (W) while transferring the water to be treated (W) from the front end to the rear end along the plurality of water tanks It is a device that processes as much as possible.

The water to be treated (W) refers to a liquid substance that needs pollutant removal treatment as it contains contaminants such as sewage, wastewater, and household water.

The water to be treated (W) may be sequentially accommodated in a plurality of water tanks automatically by flow control. That is, the water to be treated (W) may be automatically transferred to the next tank by being provided to exceed the capacity of one tank. Meanwhile, the water to be treated W may be artificially transferred to a plurality of tanks sequentially by a pump.

The raw water W1 stored in the raw water tank 1 is supplied to the water treatment device through the raw water line. Raw water may include sewage, wastewater, and living water. On the other hand, when the water to be treated W is finally treated, it becomes the treated water W2 and is collected in the treatment tank 2.

Referring to FIG. 1, a water treatment apparatus according to an embodiment of the present invention may include a blender 10, a flocculation tank 20, a flotation tank 30, and a collection tank 40.

The blender 10 of FIG. 1 is a device for mixing raw water W1 and a chemical. The blender 10 may be installed on the raw water line through which the raw water W1 moves. The blender 10 is a rapid blender and may be a linemixer. The drug may contain a coagulant such as PAC. The chemicals may be stored in the chemical tank T and then introduced into the blender 10 by the operation of the chemical pump P1.

Meanwhile, the blender of FIG. 1 may be replaced with the blender of FIG. 11. That is, the water treatment apparatus according to an embodiment of the present invention may include a mixing tank 10, a coagulation tank 20, a flotation tank 30, and a collection tank 40.

The mixing tank 10 is a tank that mixes the supplied raw water W1 and chemicals. The drug may contain a coagulant such as PAC. The chemicals can be stored in the chemical tank T and then introduced into the mixing tank 10 by the operation of the chemical pump P1.

The mixing tank 10 is equipped with a stirrer 11 so that raw water and chemicals can be effectively mixed. The stirrer 11 may include a paddle-type stirrer, a propeller-type stirrer, a turbine-type stirrer, and the like.

The coagulation tank 20 is a water tank that flocks (lumps) contaminants in the water to be treated (W) by coagulating the mixed water to be treated (W). Flocking aims to increase the size of contaminants so that they can collide with microbubbles. The size (diameter) of the floc may be 32 μm or more, but is not limited thereto.

The agitator 21 may be installed in the coagulation tank 20, and the agitator 21 may include a paddle-type stirrer, a propeller-type stirrer, a turbine-type stirrer, and the like. The agitator 21 of the coagulation tank 20 may be formed of a different type from the agitator 11 of the mixing tank 10.

The coagulation tank 20 may be formed in plural. The floc of contaminants may gradually increase while passing through the plurality of coagulation tanks 20. The water to be treated (W) that has passed through the coagulation tank (20) is introduced into the front end of the floating tank (30), and the water to be treated (W) may be introduced into the lower portion of the floating tank (30).

Meanwhile, in FIG. 11, the mixing tank 10 and the coagulation tank 20 are shown separately from each other, but unlike FIG. 11, the mixing tank 10 and the coagulation tank 20 may be integrated into one as a mixing coagulation tank. .

The flotation tank 30 is a tank using the dissolved air flotation method, and receives microbubbles, and floats the pollutant floc into microbubbles. The microbubble is composed of air and a membrane surrounding it, and is a micro-sized bubble and may have a diameter of 10 to 100 μm, but is not limited thereto. The micro bubbles may be supplied to the floating tank 30 by a micro bubble generator.

The microbubble generator may include a saturation molding device or a pump-type device.

The microbubble generator as a saturation bathing device may include an air compressor (A) and a contact tank (saturator) (B). The air compressor (A) compresses air and supplies it to the contact tank (B). The water to be treated W from which the flocs are removed is supplied to the contact tank B, and the water to be treated W is supplied through a circulation line provided between the collection tank 40 and the contact tank B. In addition, a circulation pump P2 may be provided in the circulation line. In the contact tank (B), the air and the water to be treated (W) are in contact with each other. Fine bubbles may be supplied into the floating tank 30 through a nozzle connected to the contact tank B and extending to the floating tank 30.

Meanwhile, the microbubble generator as a pump type is different from that shown in FIG. 1 and may include a microbubble generation pump (DAF pump) in which the functions of the above-described saturation molding apparatus are integrated.

In addition to this, the type of microbubble generator applied to the present invention is not limited, and all known microbubble generators may be used.

The floating tank 30 may be divided into a contact tank and a separation tank, and a partition wall 31 may be formed between the contact tank and the separation tank. That is, the front end of the partition wall 31 may be a contact tank, and the rear end of the partition wall 31 may be a separation tank. The partition wall 31 may include an inclined surface, and may be formed to be inclined by 50 to 70° in the flow direction of the water to be treated W, but is not limited thereto.

The contact tank is a space to receive microbubbles, and in the contact tank, the water to be treated (W) meets the micro bubbles, so that the flocs and micro bubbles in the water to be treated (W) collide, and the micro bubbles are combined with the collided flocs. Can injure the flocs. The water to be treated W and the fine bubbles may move upwardly along the partition wall 31.

In the separation tank, the floc (also referred to as a float) (F) floated by the fine bubbles may be separated from the water to be treated (W). That is, the float F is located on the upper layer, and the water to be treated W is located on the lower layer. This float (F) may form a layer of a predetermined thickness.

The floc (float) F floating to the surface can be removed by a skimmer. Here, the skimmer may include a half-pipe type skimmer.

2 to 5 are views showing a half-pipe type skimmer according to an embodiment of the present invention.

2 to 5, the half-pipe type skimmer 100 according to an embodiment of the present invention may include a basket 110. The basket 110 is immersed in the water to be treated (W) accommodated in the floating tank 30 to accommodate the pollutant (float) F floating to the water surface. That is, the basket 110 is located inside the water to be treated (W), but so that the uppermost portion is located slightly below the pollutant float (F) so that the floating pollutant (F) can be effectively received, (W) Can be located inside.

The basket 110 may be formed in the form of one half obtained by dividing a pipe having a hollow portion in the longitudinal direction, and this form may be referred to as a half pipe type in the present specification.

Meanwhile, the outer circumferential surface of the pipe before cutting may be a curved surface, and thus, the outer circumferential surface of the half-pipe type basket 110 may also include a curved surface. This half-pipe type basket 110 is shown in FIG. 5.

Basket 110 may be formed of a metal material, for example, may be formed of stainless steel such as SUS.

The basket 110 is installed at the rear end of the floating tank 30, and may be extended to cross the floating tank 30. Specifically, the basket 110 is disposed parallel to the water surface of the water to be treated W and extends vertically with respect to the transport direction of the water to be treated (W). Accordingly, the half-pipe type basket 110 may receive the floc F by abutting the cut cross-sectional portion with the floc F floating to the surface of the floating tank 30.

Meanwhile, for convenience of explanation, the floc accommodated in the basket 110 will be referred to as sludge (S). That is, the floated floc (F) is accommodated as sludge (S) in the basket (110).

3 and 5, an outlet H may be formed at the bottom of the basket 110. Here, the bottom of the basket 110 may be referred to as an inner peripheral surface of the pipe before cutting.

The discharge port H passes through the bottom of the basket 110 and may discharge the sludge S accommodated in the basket 110.

The discharge port H may be formed in plural. For example, the outlet (H) is formed in two, may be formed at a point that is 1/4, 3/4 of the length of the basket 110, respectively.

Referring to FIG. 4, a discharge pipe 111 is formed in the basket 110 so as to correspond to the discharge port H, and the hollow portions of the discharge port H and the discharge pipe 111 may be connected to each other.

The skimmer 100 according to an embodiment of the present invention may further include a hose 120.

Referring to FIG. 4, the hose 120 is formed of a soft material such as rubber to be bent, and may be connected to the outlet H of the basket 110. In particular, it may be combined with the discharge pipe 111 formed in the basket 110. At this time, the hose 120 is forcibly fitted into the discharge pipe 111 so that the water to be treated (W) may not flow into the basket 110 through the discharge pipe 111.

The hose 120 is connected to the sludge discharge unit 33 provided on the inner wall of the floating tank 30, and the sludge discharged through the hose 120 is discharged to the outside of the floating tank 30 through the sludge discharge unit 33 Can be.

Since the hose 120 is formed of a soft material, it may be unfolded or bent according to the height of the basket 110. That is, the hose 120 can effectively respond to a change in the height of the basket 110.

6 and 7 are views showing the sludge discharge process of the half-pipe type skimmer 100 according to an embodiment of the present invention.

Referring to FIG. 6, the floated floc F may be accommodated in the basket 110. The water to be treated (W) is transferred from the front end to the rear end of the floating tank (30), and the floated floc (F) is transferred from the front end to the rear end of the floating tank (30) together with the transfer of the treated water (W). The water to be treated (W) moves downward, and the floated floc (F) may be automatically introduced into the basket (110). In this case, the basket 110 may be positioned at the top of the basket 110 below the height of the floc (F) so as to accommodate the floc.

Referring to FIG. 7, the sludge S accommodated in the basket 110 may be discharged to the outside through the discharge port H and the hose 120. In this case, the sludge (S) may be discharged naturally through the discharge port (H), the hose 120, and the sludge discharge unit 33 by gravity. Meanwhile, the sludge (S) may be artificially discharged through the discharge port (H), the hose 120, and the sludge discharge unit 33 by a pump.

6 and 7 are respectively shown to explain the discharge process of the sludge, and the process of FIG. 6 and the process of FIG. 7 may occur independently and sequentially, but not necessarily independently and sequentially, and may occur simultaneously. have.

8 is a view showing the vertical movement of the half-pipe type skimmer 100 according to an embodiment of the present invention.

As shown in FIG. 8, the half-pipe type skimmer 100 according to the embodiment of the present invention may be vertically movable. In particular, the basket 110 may be elevated in a direction perpendicular to the surface of the water to be treated (W).

2 to 8, the half-pipe type skimmer 100 according to an embodiment of the present invention may further include a holder 130. Here, the basket 110 and the holder 130 may be integrally elevated in a direction perpendicular to the surface of the water to be treated (W).

The holder 130 supports both ends of the half-pipe type basket 110 and closes both open surfaces, so that the sludge S is not discharged through both sides of the basket 110. The holder 130 may be coupled to both ends of the basket 110 to form a pair.

The holder 130 may be formed of a disk, and may be formed of a metal material such as stainless steel.

2 to 8, the half-pipe type skimmer 100 according to an embodiment of the present invention may further include a connection part 140, a rotation shaft 150, and a gear 160.

The connection part 140 is configured to be connected to the basket 110, and when the skimmer 100 includes the holder 130, it may be directly coupled to the holder 130. There is a hole at the top end of the holder 130, and the connection part 140 may be fastened with the hole.

The connecting portion 140 may include a chain, and when the connecting portion 140 includes a chain, there is a hole at the top end of the holder 130, and the end of the chain may be fastened with the hole.

The rotation shaft 150 is installed above the basket 110 and may extend in the longitudinal direction of the basket 110. The rotation shaft 150 may be located at a rear end of the basket 110. The length of the rotation shaft 150 may be larger than the length of the basket 110, and both ends of the rotation shaft 150 may be fixed to the floating tank 30 by a fixing table 150 ′. Meanwhile, a bearing is interposed between the fixing table 150 ′ and the rotation shaft 150, so that shaft rotation may be possible while the rotation shaft 150 is fixed by the fixing table.

The rotation shaft 150 may be connected to the basket 110 by a connection part 140. In this case, as the rotation shaft 150 rotates, the connection part 140 is raised and lowered, and as a result, the basket 110 (and the holder 130) may be raised or lowered.

The gear 160 is coupled to the rotation shaft 150, and in particular, is coupled to the outer circumferential surface of the rotation shaft 150 so that the gear 160 may rotate together with the rotation of the rotation shaft 150. The gears 160 may be formed in a pair corresponding to both sides of the basket 110. The gear 160 may include teeth corresponding to the chain of the connection part 140. In this case, the gear 160 rotates according to the rotation of the rotation shaft 150, and the basket 110 (and the holder 130) may be raised and lowered when the chain of the connection portion 140 is engaged with the gear 160 and raised and lowered. .

Meanwhile, the half-pipe type skimmer 100 according to an embodiment of the present invention may further include a driving unit for driving the rotation of the rotation shaft 150.

The driving unit may include a motor (M) and a torque transmission unit.

The motor M may include a rotating shaft 151. The rotational force transmission unit includes a first wheel 152 coupled to the shaft, a second wheel 153 coupled to the above-described rotation shaft 150, and a rotational force by connecting the first wheel 152 and the second wheel 153 It may include a chain 154 to convey.

When the shaft 151 of the motor M rotates, the first wheel 152 rotates, the second wheel 153 rotates by the rotation of the first wheel 152, and the second wheel 153 The rotation shaft 150 can be rotated by the rotation of.

Here, the radius of the second wheel 153 may be smaller than the radius of the gear 160 described above, and the radius of the first wheel 152 may be smaller than the radius of the second wheel 153.

Meanwhile, the driving unit may be covered with a cover 155. The rotational force transmission unit including the chain 154 may be protected by the cover 155.

2 to 8, the half-pipe type skimmer 100 according to an embodiment of the present invention may further include a weight 170.

The connection part 140 may be formed in a state in which a part of the connection part 140 spans the gear 160, and the basket 110 is coupled to one end of the connection part 140, and the weight 170 is coupled to the other end of the connection part 140. I can. The weight 170 may be coupled to the connection part 140 by a bolt 171. The weight 170 may provide an appropriate weight to efficiently lift the basket 110.

Meanwhile, the weight 170 may be located in a space provided in the floating tank 30, and the weight 170 may move up and down in the space. The weight 170 may not be immersed in the water to be treated (W).

2 to 8, the half-pipe type skimmer 100 according to an embodiment of the present invention may further include a guide rod 180.

The guide rod 180 may be installed on the inner wall of the floating tank 30 so as to extend in the elevating direction of the basket 110. The guide rod 180 may be formed in a pair corresponding to both ends of the basket 110.

The basket 110 may be coupled to the guide rod 180 so as to be elevating, and in particular, the holder 130 coupled with the basket 110 may be coupled to the guide rod 180 so as to be elevating. Specifically, the fastening part 190 may be interposed between the holder 130 and the guide rod 180, and the fastening part 190 may include a ring surrounding the guide rod 180. Therefore, the ring of the fastening part 190 can be raised and lowered along the guide rod 180. Here, the holder 130 and the fastening part 190 are integrally coupled with each other, and the holder 130 may move up and down according to the up and down movement of the fastening part 190 with respect to the guide rod 180. As a result, the basket 110 may move up and down. In this case, the guide rod 180 may guide the lifting direction of the basket 110.

Both ends of the guide rod 180 may be fixed to the floating tank 30. In particular, the lower end of the guide rod 180 may be fixed to the inner wall of the floating tank 30 (especially the separation tank) with the first frame 181, and the lower end of the guide rod 180 is of the floating tank 30 The second frame 182 may be fixed to the top surface. Here, the first frame 181 and the guide rod 180 may be bolted, and the second frame 182 and the guide rod 180 may be bolted.

9 and 10 are views showing the operation of the half-pipe type skimmer 100 according to an embodiment of the present invention.

Referring to FIGS. 9 and 10, the half-pipe type skimmer 100 according to an embodiment of the present invention may be elevated according to the level of water to be treated (W) in the floating tank 30. In particular, the height of the basket 110 may be adjusted according to the level of the water to be treated (W) in the floating tank 30.

Here, the half-pipe type skimmer 100 according to an embodiment of the present invention may be interlocked with the water level sensor 35 installed in the floating tank 30.

Referring to FIG. 9, as the water level changes from FIG. 9 (a) to FIG. 9 (b), when the skimmer 100 cannot accommodate the floc (F), the basket 110 is lower than the water level. It is adjusted (raised) to be able to accommodate the flock (F) again as shown in Fig. 9(c).

Referring to FIG. 10, as the water level changes from FIG. 10(a) to FIG. 10(b), when the skimmer 100 cannot accommodate the floc (F), the basket 110 is lower than the water level. It can be adjusted (lowered) to accommodate the floc (F) again as shown in Fig. 10 (c).

The height adjustment of the skimmer 100 (basket 110) may be implemented by the control unit controlling the motor M of the driving unit. That is, in the case of FIG. 9 and FIG. 10, the motor M may be rotated in opposite directions. In addition, the number of rotations of the motor M may be determined according to the level of the water to be treated W.

Referring back to FIG. 1, the sludge discharged by the half-pipe type skimmer 100 may be stored in the sludge storage tank 3.

In addition, the water to be treated (W) treated in the floating tank 30 may be transferred to the collection tank 40. In this case, the water to be treated W may be moved through the passage 32 provided between the floating tank 30 and the collection tank 40.

The collection tank 40 may have a function of filtering the water to be treated (W). For example, the collection tank 40 may be equipped with a filter to perform filtering treatment before finally exporting the water to be treated (W) to the treatment tank 2.

A sluice gate 41 may be installed in the collection tank 40. The sluice gate 41 may be moved up and down by the sluice gate driver 42, and the level of the water to be treated W may be adjusted by opening and closing the sluice gate 41.

The water to be treated (W) collected in the collection tank 40 may be circulated to the microbubble generator through a circulation line and used to generate microbubbles in the microbubble generator.

The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

1: raw water tank
W1: enemies
2: treatment tank
W2: treated water
3: sludge storage tank
S: sludge
10: blender or blender
20: flocculation tank
11, 21: stirrer
30: Injury Team
31: bulkhead
32: passage
33: sludge discharge unit
40: collection tank
41: sluice gate
42: sluice drive unit
100: skimmer
110: basket
H: outlet
111: discharge pipe
120: hose
130: holder
140: connection
150: rotary shaft
150': fixture
M: motor
160: gear
170: pendulum
180: guide rod
181, 182: frame
190: fastening part

Claims (8)

In a skimmer included in a water treatment device using a dissolved air levitation method,
It includes a basket that is immersed in the water to be treated contained in the floating tank to accommodate contaminants floating on the surface
The basket is installed at the rear end of the floating tank, and is extended to cross the floating tank,
At the bottom of the basket, characterized in that the discharge port for discharging the accommodated sludge is formed,
Half pipe type skimmer. The method of claim 1,
The basket is a semi-pipe type skimmer that can be raised or lowered in a direction perpendicular to the water surface. The method of claim 2,
A rotation shaft installed above the basket and extending in a longitudinal direction of the basket; And
Further comprising a connection portion connecting the rotation shaft and the basket,
The basket is raised and lowered according to the rotation of the rotating shaft,
Half pipe type skimmer. The method of claim 3,
A gear coupled to the rotation shaft; And
Further comprising a holder coupled to both ends of the basket,
The connection portion is coupled to the holder and comprises a chain meshed with the gear,
Half pipe type skimmer. The method of claim 2,
A guide rod installed on the inner wall of the floating tank to extend in the lifting direction of the basket; And
Further comprising a holder coupled to both ends of the basket so as to move up and down with respect to the guide rod,
Half pipe type skimmer. The method of claim 1,
The height of the basket is adjusted according to the level of the water to be treated in the floating tank, half-pipe type skimmer. The method of claim 1,
A half-pipe type skimmer further comprising a hose coupled to the outlet to discharge pollutants. In the water treatment apparatus using the dissolved air flotation method,
A floating tank that receives water to be treated and is supplied with fine bubbles to float contaminants; And
Including a half-pipe type skimmer (skimmer) installed in the floating tank,
The half-pipe type skimmer corresponds to any one of claims 1 to 7,
Water treatment device.

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