KR102278779B1 - Half-pipe skimmer and water treatment device having the same - Google Patents

Abstract

A half-pipe type skimmer and a water treatment device including the same according to an embodiment of the present invention, in a skimmer included in a water treatment device using a dissolved air flotation method, is immersed in the target water accommodated in the flotation tank, a basket for accommodating the levitated contaminants, wherein the basket extends across the flotation tub at the rear end of the flotation tank, and an outlet for discharging the accommodated sludge is formed at the bottom of the basket do it with

Description

Half-pipe type skimmer and water treatment device including same {HALF-PIPE SKIMMER AND WATER TREATMENT DEVICE HAVING THE SAME}

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

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

Here, in the flotation method of cohesive flotation of suspended substances in water, when there are many substances lighter than water in the water, small air bubbles are generated and injected, and the aggregated solid mass (floc) is raised by light bubble buoyancy. tell how to do it The flotation method may be divided into an air-flotation method, a dissolved air-flotation (DAF) method, and a vacuum flotation method.

In particular, dissolved air flotation (Dissolved Air Flotation, DAF) is a process for removing particles in water by flotation using microbubbles. The float formed by the combination of microbubbles and flocs accumulates on the water surface, and is continuously or intermittently removed by a collecting device.

Various collection devices for collecting floats injured in the dissolved air flotation method have been developed, and the inventor of the present invention has completed the present invention after long research 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 from a water treatment apparatus by a dissolved air flotation method and a water treatment apparatus including the same.

Other objects not specified in the present invention will be further considered within the scope that can be easily inferred from the following detailed description and effects thereof.

According to one aspect of the present invention, in a skimmer included in a water treatment apparatus using the dissolved air flotation method, a basket is immersed in the water to be treated contained in the flotation tank and accommodates the contaminants floating to the water surface. Including, the basket is provided at the rear end of the flotation tank, extending to cross the flotation tank, the bottom of the basket, characterized in that the outlet for discharging the accommodated sludge is formed, a half-pipe type skimmer is provided.

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

a rotation shaft installed on the basket and extending in the longitudinal direction of the basket; and a connection part connecting the rotation shaft and the basket, wherein the basket can be raised and lowered according to the rotation of the rotation shaft.

a gear coupled to the rotation shaft; and

It may further include a holder coupled to both ends of the basket, and the connecting portion may include a chain coupled to the holder and engaged with the gear.

a guide rod installed on the inner wall of the floating tank so as to extend in the elevating direction of the basket; and a holder coupled to both ends of the basket to be movable up and down with respect to the guide rod.

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

A hose coupled to the outlet may further include a hose for discharging contaminants.

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 that accommodates water to be treated and receives microbubbles to float contaminants; and a half-pipe type skimmer installed in the flotation tank, wherein the half-pipe type skimmer corresponds to one of claims 1 to 7, a water treatment device is provided.

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

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects 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 the sludge discharge process of the half-pipe type skimmer according to an embodiment of the present invention.
Figure 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.
It is revealed that 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 thereby.

In the description of the present invention, if it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the 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. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, a half-pipe type skimmer according to the present invention and a water treatment device including the same 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 thereof 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 while transferring the water to be treated (W) from the front end to the rear along the plurality of water tanks, the state in which the water to be treated (W) can be finally discharged It is a device for processing.

The water to be treated (W) is sewage, wastewater, domestic water, etc., and contains contaminants and thus means a liquid material that needs to be treated to remove contaminants.

The water to be treated (W) may be automatically accommodated in a plurality of water tanks sequentially by controlling the flow rate. 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 sequentially transferred to a plurality of water tanks artificially 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, domestic water, and the like. On the other hand, when the to-be-treated water W is finally treated, it becomes the treated water W2 and is collected into the treated water tank 2 .

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

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

Meanwhile, the mixer of FIG. 1 may be replaced with the mixer 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 floating tank 30 , and a collecting tank 40 .

The mixing tank 10 is a water tank for mixing the supplied raw water W1 and chemicals. The pharmaceutical may include a coagulant such as PAC. The chemical is stored in the chemical tank (T) and may be introduced into the mixing tank (10) by the operation of the chemical pump (P1).

A stirrer 11 is installed in the mixing tank 10 to effectively mix raw water and chemicals. 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 in which the mixed water to be treated W is aggregated, and contaminants in the water to be treated W are flocked (agglomerated). Flocculation aims to increase the size of the contaminant so that it can collide with the microbubbles. The size (diameter) of the flock may be 32 μm or more, but is not limited thereto.

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

The coagulation tank 20 may be formed in plurality. As it passes through the plurality of coagulation tanks 20 , the flocs of contaminants may gradually increase. The to-be-treated water W that has passed through the coagulation tank 20 flows into the front end of the flotation tank 30 , and the to-be-treated water W may be introduced into the lower part of the flotation 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 and coagulation tank. .

The flotation tank 30 is a water tank using the dissolved air flotation method, and receives microbubbles to float the contaminant flocs into microbubbles. The microbubbles are made of air and a membrane surrounding the air, and are micro-sized bubbles and may have a diameter of 10 to 100 μm, but is not limited thereto. The microbubbles may be supplied to the flotation tank 30 by a microbubble generator.

The microbubble generator may include a saturated tank type device or a pump type device.

The microbubble generator as a saturation tank 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 contact tank B is supplied with the treated water W from which the floc has been removed, and the treated water W is supplied through a circulation line provided between the collecting 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), air and the water to be treated (W) are in contact with each other. The microbubbles may be supplied into the flotation tank 30 through a nozzle connected to the contact tank B and extended to the flotation tank 30 .

On the other hand, the microbubble generator as a pump type is different from that shown in FIG. 1 , and may include a microbubble generating pump (DAF pump) in which the function of the above-described saturation tank molding apparatus is integrated.

In addition, the type of microbubble generator applied to the present invention is not limited, and any known microbubble generator 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 at an inclination of 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 that receives microbubbles, and the treated water (W) meets the microbubbles in the contact tank and the flocs and microbubbles in the treated water (W) can collide. It can injure the flocs. The water to be treated (W) and the microbubbles may move upward along the partition wall (31).

In the separation tank, the flocs (also referred to as floats) F floated by microbubbles may be separated from the water to be treated (W). That is, the float F is located in the upper layer, and the water to be treated W is located in the lower layer. These floats (F) may form a layer having a predetermined thickness.

The flocs (floats) F floating to the water 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 flotation tank 30, and accommodates the contaminants (floats) F floating to the water surface. That is, the basket 110 is located inside the water to be treated (W), so that the uppermost end is located slightly below the float (F) of the pollutants (F) to effectively accommodate the floating contaminants (F), the water to be treated (W) It can be located inside.

The basket 110 may be formed in the form of one half in which a pipe having a hollow portion is divided into two in the longitudinal direction, and this form may be referred to as a half-pipe type in the present specification.

On the other hand, the outer peripheral surface of the pipe before cutting may be a curved surface, therefore, the outer peripheral surface of the half-pipe-shaped basket 110 may also include a curved surface. Such a half-pipe-shaped basket 110 is shown in FIG. 5 .

The 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 extend to cross the floating tank 30 . Specifically, the basket 110 is disposed parallel to the surface of the water to be treated (W) and extends perpendicular to the transport direction of the water to be treated (W). Accordingly, the half-pipe-type basket 110 may receive the flock (F) by contacting the cut cross-section with the flock (F) floated to the surface of the floating tank (30).

On the other hand, for convenience of description, the flock accommodated in the basket 110 will be referred to as sludge (S). That is, the floated flock (F) is accommodated as sludge (S) in the basket (110).

Referring to FIGS. 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 the inner circumferential surface of the pipe before cutting.

The outlet (H) passes through the bottom of the basket (110), and may discharge the sludge (S) accommodated in the basket (110).

The outlet (H) may be formed in plurality. For example, the outlet H is formed in two, and may be formed at 1/4 and 3/4 of the length of the basket 110, respectively.

Referring to FIG. 4 , a discharge pipe 111 is formed in the basket 110 to correspond to the discharge port H, and the hollow portion 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, so that it can be bent, and can 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 may be press-fitted to 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 flexible material, it may be stretched 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 flock 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 flotation tank 30, and the floated flock F is transferred from the front end to the rear end of the flotation tank 30 together with the transfer of the water to be treated (W). The water to be treated (W) moves downward, and the floated flock (F) may be automatically introduced into the basket (110). In this case, the uppermost end of the basket 110 may be located below the height of the flock F so that the basket 110 can accommodate the flock.

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

6 and 7 are respectively shown to explain the discharge process of sludge, and although the process of FIG. 6 and the process of FIG. 7 may occur independently and sequentially, they do not necessarily occur 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 Figure 8, the half-pipe type skimmer 100 according to the embodiment of the present invention may be movable up and down. In particular, the basket 110 may be liftable in a direction perpendicular to the water surface 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 raised and lowered in a direction perpendicular to the water surface to be treated (W).

The holder 130 supports both ends of the half-pipe type basket 110 and closes the open sides of both sides, 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 unit 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 uppermost end of the holder 130 , and the connection part 140 may be coupled to the hole.

The connection part 140 may include a chain, and when the connection part 140 includes a chain, there is a hole in the uppermost end of the holder 130 , and the end of the chain may be fastened to the hole.

The rotating shaft 150 is installed on the upper portion of 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 rotating shaft 150 may be greater than the length of the basket 110 , and both ends of the rotating shaft 150 may be fixed to the floating tank 30 by the fixing table 150 ′. On the other hand, a bearing is interposed between the fixing table 150 ′ and the rotation shaft 150 , and the rotation shaft 150 may be axially rotated in a state in which the rotation shaft 150 is fixed by the fixing table.

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

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

On the other hand, 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 rotating shaft 150 .

The driving unit may include a motor M and a rotational force transmitting 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 to each other. It may include a chain 154 that carries

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 rotates. The rotation shaft 150 may rotate by the rotation of .

Here, the radius of the second wheel 153 may be smaller than the radius of the aforementioned gear 160 , 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 spans the gear 160 , 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 . can The weight 170 may be coupled to the connection unit 140 by a bolt 171 . The weight 170 may provide an appropriate weight to allow the basket 110 to be raised and lowered efficiently.

On the other hand, the weight 170 may be located in the space provided in the floating tank 30, the weight 170 may move up and down in the space. This 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 flotation tank 30 so as to extend in the elevating direction of the basket 110 . The guide rods 180 may be formed in pairs to correspond to both ends of the basket 110 .

The basket 110 may be vertically coupled to the guide rod 180 , and in particular, the holder 130 coupled to the basket 110 may be vertically coupled to the guide rod 180 . 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 . Accordingly, the hook of the fastening part 190 may be raised and lowered along the guide rod 180 . Here, the holder 130 and the fastening part 190 are integrally coupled to each other, and the holder 130 may move up and down according to the vertical movement of the fastening part 190 with respect to the guide rod 180 . As a result, the basket 110 may move up and down. At this time, 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) by the first frame 181 , and the lower end of the guide rod 180 is the floating tank 30 . The second frame 182 may be fixed to the uppermost 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.

9 and 10 , the half-pipe type skimmer 100 according to an embodiment of the present invention may be raised or lowered according to the level of the water to be treated (W) in the flotation tank 30 . In particular, the height of the basket 110 can 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 flotation tank 30 .

Referring to FIG. 9, when the water level increases as shown in FIG. 9(a) to FIG. 9(b) and the skimmer 100 cannot accommodate the flock (F), the basket 110 is raised to a height below the water level. It is adjusted (raised) so that the flock F can be accommodated again as shown in FIG. 9( c ).

Referring to FIG. 10, when the water level is lowered and the skimmer 100 cannot accommodate the flock (F) as changed from FIG. It is adjusted (lowered) so that the flock F can be accommodated 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 the case of FIG. 10 , the motor M may rotate 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 above-described 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 to-be-treated water W may be moved through the passage 32 provided between the floating tank 30 and the collecting tank 40 .

The collection tank 40 may have a function of filtering the water to be treated (W). For example, the collection tank 40 is equipped with a filter, so that the water to be treated (W) may be filtered before finally being discharged to the treatment water 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 water 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 the circulation line and used to generate the microbubbles of the microbubble generator.

The protection scope 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 protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

1: raw tank
W1: Enemies
2: treatment tank
W2: treated water
3: sludge storage tank
S: sludge
10: blender or blender
20: coagulation tank
11, 21: agitator
30: floating tank
31: bulkhead
32: passage
33: sludge discharge unit
40: Collector
41: sluice gate
42: sluice gate drive unit
100: skimmer
110: basket
H: outlet
111: discharge pipe
120: hose
130: holder
140: connection
150: axis of rotation
150': fixture
M: motor
160: gear
170: weight
180: guide rod
181, 182: frame
190: fastening part

Claims (8)

In the skimmer included in the water treatment device using the dissolved air flotation method,
It is immersed in the water to be treated contained in the flotation tank, and includes a basket for accommodating contaminants that float to the surface and form a layer of a predetermined thickness,
The basket is made of a half of a cylindrical pipe having a hollow part cut in the longitudinal direction,
The basket is installed at the rear end of the flotation tank and extends to cross the flotation tank,
At the bottom of the basket, an outlet for discharging the accommodated sludge is formed,
a rotating shaft installed on the upper portion of the basket to be positioned at the rear end of the basket and extending in the longitudinal direction of the basket to cross the floating tank;
a gear coupled to the rotation shaft;
a holder coupled to both ends of the basket to close both sides of the basket;
a connection part having one end coupled to the holder and including a chain engaged with the gear; and
Further comprising a weight coupled to the other end of the connection part,
As the rotation shaft rotates, the holder and the basket are raised and lowered in a direction perpendicular to the water surface,
A space for receiving the additionally is provided at the rear end of the floating tank so as not to be immersed in the additional target water;
a pair of guide rods extending in the elevating direction of the basket and fixed to both side walls of the floating tank; and
It is integrally coupled to the holder, further comprising a fastening portion surrounding the guide rod,
When the holder and the basket are raised and lowered, the fastening part moves up and down along the guide rod,
The lower end of the guide rod is fixed to the inner surface of the side wall of the floating tank through a first frame, and the upper end is fixed to the uppermost surface of the side wall of the floating tank through a second frame,
The upper end of the fastening part is located higher than the upper end of the basket,
A water level sensor is installed in the floating tank,
The height of the basket is adjusted according to the level of the water to be treated measured by the water level sensor, and the upper end of the basket is adjusted to be located within the contaminant layer,
Half-pipe skimmer. delete delete delete delete delete According to claim 1,
Further comprising a hose coupled to the outlet to discharge contaminants, half-pipe type skimmer. In the water treatment apparatus using the dissolved air flotation method,
a flotation tank that accommodates water to be treated and receives microbubbles to float contaminants; and
Including a half-pipe type skimmer (skimmer) installed in the flotation tank,
The half-pipe type skimmer corresponds to claim 1,
water treatment device.

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