KR102195868B1 - Single reactor type pressure floatation system - Google Patents

Abstract

Disclosed is a single reactor type pressure floatation system, capable of solving a problem caused by cavity phenomenon. The single reactor type pressure floatation system comprises: a first vessel including an open top surface; a second vessel disposed inside the first vessel and including an open top surface; a partition extending upwards from a bottom surface of the second vessel to divide an inner space of the second vessel into a drug reaction region of a column shape and an agglomeration region of a ring shape, and including a plurality of through holes; a waste water supply part connected with the drug reaction region through the bottom surface of the second vessel; a flocculant supply part to supply flocculant to the drug reaction region; a stirring part disposed in the drug reaction region to stir waste water mixed with the flocculant; a pressurized water supply part to supply pressurized water in which air is melted to a pressure floatation region formed between the first vessel and the second vessel; a scum removing part to remove scum floating to the upper part of the pressure floatation region; and a treated water exhaust part connected with a lower portion of the pressure floatation region to exhaust treated water remained by removing the scum from the waste water to the outside the first vessel.

Description

Single reactor type pressure flotation system {SINGLE REACTOR TYPE PRESSURE FLOATATION SYSTEM}

The present invention relates to a single reaction tank pressurized flotation system.

The pressurized flotation separation method is a method of floating and separating the suspension by pressing air and dissolving it in wastewater, and fine bubbles precipitated when returning to normal pressure in a reaction tank that is open to the atmosphere are attached to the suspension. It is used when not.

The conventional pressure flotation system has a structure in which a chemical reaction tank, a coagulation tank, and a pressure flotation tank are sequentially connected.

Specifically, in the chemical reaction tank, a coagulant is injected into the wastewater and a high-speed stirrer is used to induce a chemical reaction with the suspension, and in the coagulation tank, the suspension reacted with the coagulant is agglomerated using a low-speed stirrer. In the pressurized flotation tank, pressurized water injected with air is injected to remove the floated solids with a scum remover and the treated water is discharged to a subsequent process.

However, as described above, in the pressurized floating system, there is a problem that a high installation cost is required, such as having to have three reaction tanks and installing a stirrer in each reaction tank, and a high power cost during operation.

In addition, in the conventional pressurized levitation system, an ejector for air intake was directly connected to the pressurized water pipe in which a pump is installed to inject air into the pressurized water, but during long-term operation, a cavitation occurs and the impeller inside the pump, There is also a problem that the pump case may be damaged, and thus the life of the equipment is shortened.

Republic of Korea Patent Publication No. 10-2121352 (2020.06.10, Whey and wastewater treatment method using a sprinkler circulator)

An embodiment of the present invention provides a single reaction tank pressure flotation system in which chemical reaction, agglomeration and pressure flotation are performed in one reactor.

According to an aspect of the present invention, the first container portion with an open top surface; A second container part disposed inside the first container part and having an open top surface; A partition wall extending upward from the bottom surface of the second container part, dividing the inner space of the second container part into a columnar chemical reaction area and an annular aggregation area, and having a plurality of through holes; A wastewater supply unit connected to the chemical reaction region through a bottom surface of the second container unit; A coagulant supply unit for supplying a coagulant to the chemical reaction zone; A stirrer disposed within the chemical reaction zone to stir the wastewater mixed with a coagulant; A pressurized water supply unit for supplying pressurized water in which air is dissolved to a pressurized floating area formed between the first container unit and the second container unit; A scum removal unit for removing scum floating above the pressurized area; And a treated water discharge unit connected to a lower portion of the pressurized floating area to remove scum from the waste water and discharge the remaining treated water to the outside of the first container unit.

It may further include a wastewater transfer unit for transferring the wastewater from the coagulation area to the pressure floating area.

Further comprising a sludge discharge unit for discharging the sludge deposited on the bottom surface of the first container unit to the outside of the first container unit, the bottom surface of the first container unit is a depression disposed spaced apart from the inner surface of the first container unit, And an inclined portion extending downward from an inner surface of the first container portion to the depression, wherein the sludge discharge portion comprises: a sludge transfer pipe connected to the depression; And an on-off valve installed in the sludge transfer pipe.

The partition wall has a circular pipe shape, and a hollow, truncated guide member that decreases the diameter of the through hole toward the cohesion region may be coupled to an outer surface of the partition wall.

The wastewater supply unit may include: a first wastewater transfer pipe passing through a bottom surface of the second container and connected to the chemical reaction region; A hopper coupled to the upper outlet of the first wastewater transfer pipe; And a mixer rotatably coupled to an upper outlet side of the first wastewater transfer pipe, and rotates by a flow of wastewater discharged from the first wastewater transfer pipe to the hopper, wherein the coagulant supply unit includes a It may include a coagulant conveying pipe passing through the side and supplying the coagulant to the inner space of the hopper.

The pressurized water supply unit, pressurized water storage tank; A first treated water transfer pipe connected to a lower portion of the pressurized floating area to supply treated water to the pressurized water storage tank; An air transfer pipe supplying air to the pressurized water storage tank; And a first pressurized water transfer pipe connected to the pressurized water storage tank, penetrating a lower side surface of the first container part, and connected to the pressurized floating area.

A curved swash plate extending downwardly inclined is coupled to a lower outer surface of the second container, and the first pressurized water transfer pipe may spray pressurized water toward an upper surface of the curved swash plate.

The treated water discharge unit may include an annular pipe disposed under the second container and having a plurality of outlet holes; And a second treated water transfer pipe connected to the annular pipe and extending to the outside of the first container part.

The curved swash plate may be disposed on the annular pipe to prevent sludge settling toward the bottom surface of the first container part from flowing into the annular pipe.

The scum removing unit may include an annular frame disposed on the pressure floating area and extending along the pressure floating area; A plurality of rollers coupled to an upper end of the first container to support the annular frame; A drive motor having a pinion gear engaged with a rack gear formed in a circumferential direction in the annular frame, and rotating the annular frame; A scraper coupled to the annular frame and disposed above the pressure floating area; A scum box disposed above the pressurized floating area to collect the scum transferred by the scraper; And it may include a scum conveying pipe connected to the scum box.

According to an embodiment of the present invention, by dividing the inner space of one reaction tank into a chemical reaction zone, a coagulation zone, and a pressurization floating zone, chemical reaction, agglomeration and pressure flotation can be performed in one reaction tank, and thus installation cost and Power cost can be reduced during operation.

In addition, by producing and supplying pressurized water in a separate pressurized water storage tank, it is possible to solve the problem of cavitation.

In addition, it is possible to increase the separation efficiency of solids by the curved swash plate, to minimize the treatment volume of the pressurized floating area, to facilitate the resurfacing of the solids, and to suppress the increase of solids in the treated water.

1 is a diagram of a single reaction tank pressurized floating system according to an embodiment of the present invention,
Figure 2 is a front view of the partition wall of Figure 1,
3 is an enlarged cross-sectional view of the guide member of FIG. 2,
Figure 4 is a partial enlarged view of the wastewater supply unit of Figure 1,
5 is a partial enlarged view of the pressurized water supply unit of FIG. 1,
6 is an exploded view of the curved swash plate of FIG. 1,
7 is a partially enlarged view of the scum removal unit of FIG. 1,
8 is a partially enlarged view of the treated water discharge unit of FIG. 1.

Hereinafter, exemplary 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 pertains, unless clearly defined in a different meaning, and only specific It will be viewed as illustrative of the embodiment, but is not intended to limit the present invention.

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

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

In addition, when a component is described as "top", it means above or below the component, and does not necessarily mean that the component is positioned above the direction of gravity.

In addition, when a component is described as being "connected" or "coupled" to another component, the component is not only directly connected or coupled to another component, but the component is indirectly through another component. It may also include the case of being connected or combined.

In addition, terms such as first and second may be used in describing certain elements, but these terms are only to distinguish the corresponding element from other elements, and the nature or order of the corresponding element is based on the term. Or, it is not intended to limit the order or the like.

1 is a diagram of a single reaction tank pressurized floating system according to an embodiment of the present invention.

Referring to FIG. 1, a single reaction tank type pressurized floating system 10 according to an embodiment of the present invention includes a first container part 110, a second container part 120, a partition wall 130, and a wastewater supply part 200. , Coagulant supply unit 300, stirring unit 400, pressurized water supply unit 500, scum removal unit 600, and may include a treated water discharge unit 700, wastewater transfer unit 800 and / or sludge discharge It may further include a unit 900.

The first container part 110 may be a container having an open top surface.

The second container part 120 may be disposed inside the first container part 110 and may be a container having an open top surface.

The second container part 120 may be fixed to the first container part 110 through a plurality of support bars (not shown) connecting the first container part 110 and the second container part 120, but must be It is not limited thereto.

The partition wall 130 may be coupled to the second container part 120 so as to extend upward from the bottom surface of the second container part 120.

The partition wall 130 may divide the inner space of the second container unit 120 into a chemical reaction region A1 and a coagulation region A2. For example, the partition wall 130 may have a circular pipe shape extending in the vertical direction, the chemical reaction region A1 may be a cylindrical space formed in the partition wall 130, and the aggregation region A2 is 2 It may be a ring-shaped space formed between the container part 120 and the partition wall 130.

2 is a front view of the partition wall of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the guide member of FIG. 2.

1 to 3, the partition wall 130 may have a plurality of through holes 131 penetrating through the partition wall 130, and the drug reaction region A1 is formed through the plurality of through holes 131. It may be connected to the aggregation region A2.

In addition, a guide member 133 having a hollow truncated cone shape may be coupled to the outer surface of the partition wall 130.

The guide member 133 may disturb the fluid flow in the agglomeration region A2 by decreasing the diameter of the through hole 131 toward the condensation region A2, and may have a high mixing strength.

On the other hand, the second container part 120 is disposed spaced apart from the bottom surface and the inner surface of the first container part 110, so that the pressure floating area A3 between the first container part 110 and the second container part 120 ) Can be formed.

The wastewater supply unit 200 may be connected to the chemical reaction region A1 through the bottom surface of the second container unit 120, and may supply wastewater to be treated to the chemical reaction region A1.

The coagulant supply unit 300 may supply a coagulant to the chemical reaction zone A1, and the coagulant may react with the suspension in the wastewater to coagulate, thereby forming a floc.

4 is a partial enlarged view of the wastewater supply unit of FIG. 1.

1 and 4, the wastewater supply unit 200 may include a first wastewater transfer pipe 210, a hopper 220 and a mixer 230, and the coagulant supply unit 300 is a coagulant transfer pipe 310 ) Can be included.

The first wastewater transfer pipe 210 may pass through the bottom surface of the second container unit 120 and be connected to the chemical reaction region A1, and may supply wastewater to be treated to the chemical reaction region A1.

The hopper 220 may be coupled to the upper outlet of the first wastewater transfer pipe 210, and may have a shape in which the inner diameter increases toward the upper end.

In addition, the coagulant transfer pipe 310 may pass through the side surface of the hopper 220 to supply the coagulant to the inner space of the hopper 220. Therefore, the mixing efficiency between the wastewater and the coagulant can be improved.

The mixer 230 may be rotatably coupled to the upper outlet side of the first wastewater transfer pipe 210 and rotate by the flow of wastewater discharged from the first wastewater transfer pipe 210 to the hopper 220. have. That is, a separate power source may not be required for the mixer 230.

Meanwhile, in addition to the coagulant, a pH adjusting agent may be additionally supplied to the chemical reaction zone A1.

The stirring unit 400 may agitate the wastewater mixed with a coagulant in the chemical reaction zone A1.

The stirrer 400 may include a stirrer 410 disposed in the chemical reaction zone A1, and a motor 420 that rotates the stirrer, and the motor 420 can convert the rotation speed of the stirrer 410. Can be a variable speed motor.

The fluid flow generated by the stirring unit 400 may be transmitted to the condensation region A2 through the plurality of through holes 131 formed in the partition wall 130.

The pressurized water supply unit 500 may supply pressurized water in which air is dissolved, for example, pressurized water in which air is dissolved in a saturated state, to the pressurized floating area A3. For example, the pressurized water storage tank 510, 1 may include a treated water transfer pipe 520, an air transfer pipe 530, and a first pressurized water transfer pipe 540.

Air and treated water are supplied to the pressurized water storage tank 510 to produce and store pressurized water in which air is dissolved.

The pressurized water storage tank 510 may include a window 511 made of a transparent material so that the user can check the level of pressurized water, a water level sensor 513 for detecting the level of pressurized water, and a pressurized water storage tank 510 ) It is installed in the second pressurized water transfer pipe 515 and the second pressurized water transfer pipe 515 to discharge the pressurized water stored in the inside, so that the water level of the pressurized water is constant according to the detection result of the water level sensor 513. An opening/closing valve 517 for opening and closing the second pressurized water transfer pipe 515 to be maintained may be additionally provided.

The first treated water transfer pipe 520 may be connected to the lower portion of the pressurized floating area A3 and may supply treated water to the pressurized water storage tank 510.

To this end, a pump and an opening/closing valve may be installed in the first treated water transfer pipe 520.

The air transfer pipe 530 may supply air to the pressurized water storage tank 510. For example, the air transfer pipe 530 may be connected to an air tank or an ejector to receive air, and an opening/closing valve or the like may be installed in the air transfer pipe 530.

The first pressurized water transfer pipe 540 may be connected to the pressurized water storage tank 510, and may pass through the lower side of the first container unit 110 and be connected to the pressurized floating area A3, and the pressurized water storage tank The pressurized water stored in the 510 may be supplied to the pressurized floating area A3.

To this end, a pump and an on/off valve may be installed in the first pressurized water transfer pipe 540.

5 is a partial enlarged view of the pressurized water supply unit of FIG. 1.

1 and 5, the first pressurized water transfer pipe 540 may be branched into a plurality of pipes 541 so that pressurized water can be uniformly sprayed into the pressurized floating area A3, and each pipe ( The 541 may pass through the lower side of the first container part 110 and be connected to the pressurized floating area A3, and the plurality of pipes 541 are spaced apart from each other along the circumferential direction of the first container part 110 Can be.

At this time, a pump may be installed in the first pressurized water transfer pipe 540, and a flow meter 543 and a flow control valve 545 may be installed in each pipe 541.

Meanwhile, a curved swash plate 121 extending downwardly inclined may be coupled to the lower side of the second container unit 120, and the first pressurized water transfer pipe 540 may supply pressurized water toward the upper surface of the curved swash plate 121. Can be sprayed. Therefore, it is possible to facilitate the re-floating of the solid material, it is possible to increase the separation efficiency of the solid material, it is also possible to minimize the treatment volume of the pressure floating area (A3).

6 is an exploded view of the curved swash plate of FIG. 1.

1 and 6, the curved swash plate 121 is coupled to the lower side of the second container unit 120 to separate the space above the pressurization unit and the space for discharging the treated water.

For example, a plurality of swash plate fixing parts 123 to which the curved swash plate 121 can be detachably coupled may be installed on the outer surface of the second container unit 120 so as to be spaced apart from each other in the vertical direction, As a result, the installation height of the curved swash plate 121 may be adjusted.

The curved swash plate 121 may have a downward concave curvature along the circumferential direction of the second container part 120.

The scum removing unit 600 may remove the scum floating above the pressurized floating area A3.

7 is a partially enlarged view of the scum removal unit of FIG. 1.

1 and 7, the scum removal unit 600 includes an annular frame 610, a plurality of rollers 620, a driving motor 630, a scraper 640, a scum box 650, and a scum conveying pipe. It may include 660.

The annular frame 610 may be disposed on the pressure floating area A3, and may have a ring shape so as to extend along the pressure floating area A3.

The plurality of rollers 620 may be rotatably coupled to an upper end of the first container unit 110 to support the annular frame 610. In addition, a plurality of rollers 620 may be disposed on the upper end of the second container 120.

The driving motor 630 may rotate the annular frame 610. For example, a rack gear 611 extending in the circumferential direction of the annular frame 610 may be formed on the lower surface of the annular frame 610, and the rack gear 611 on the rotating shaft of the drive motor 630 The pinion gear 631 to engage may be engaged.

The scraper 640 may be coupled to the annular frame 610 and may be disposed above the pressure floating area A3. For example, the scraper 640 may have a bar shape extending toward an inner surface of the first container part 110 and an outer surface of the second container part 120.

The scraper 640 may be transferred to the scum box 650 by scraping the scum floating on the upper part of the pressure floating area A3 while moving along the pressure floating area A3 according to the rotation of the annular frame 610. .

The scum box 650 may be disposed above the pressurized floating area A3, and the scum transferred by the scraper 640 may be collected in the scum box 650. For example, the scum box 650 may have a container shape with an open upper surface, and may be coupled to an upper inner surface of the first container part 110, and the upper end of the scum box 650 is a pressurized floating area (A3). ) May be disposed at substantially the same height as the water surface of the wastewater accommodated in). However, it is not necessarily limited thereto.

The scum conveying pipe 660 may be connected to the scum box 650 and discharge the scum collected in the scum box 650 to the outside of the first container unit 110. For example, the scum conveying pipe 660 may pass through the side surface of the first container unit 110 and be connected to the scum box 650, and an opening/closing valve may be installed in the scum conveying pipe 660.

The treated water discharge unit 700 may be connected to the lower part of the pressurized floating area A3, and the scum is removed in the pressurized floating area A3 and the remaining treated water can be discharged to the outside of the first container unit 110. have.

8 is a partially enlarged view of the treated water discharge unit of FIG. 1.

1 and 8, the treated water discharge unit 700 may include an annular pipe 710 and a second treated water transfer pipe 720.

The annular pipe 710 may be disposed under the second container 120 and may have a circular annular shape so that the treated water can be uniformly discharged. The annular pipe 710 may be formed with a plurality of outlet holes 711 spaced apart from each other along the annular pipe 710.

The second treated water transfer pipe 720 may be connected to the annular pipe 710 and may extend outside the first container part 110.

A pump for transferring or discharging the treated water may be installed in the second treated water transfer pipe 720.

Accordingly, the treated water in the pressurized floating area A3 can be introduced into the annular pipe 710 through the plurality of outlet holes 711, and the second treated water transfer pipe through the second treated water transfer pipe 720. It can be transferred to a subsequent process connected to 720 or a water treatment facility.

In addition, the curved swash plate 121 may be disposed on the annular pipe 710 to block the sludge deposited toward the bottom surface of the first container unit 110 from flowing into the annular pipe 710.

For example, the curved swash plate 121 may increase the outer diameter of the second container unit 120 to be larger than the ring diameter of the annular pipe 710 so that sludge cannot directly descend on the annular pipe 710.

The wastewater transfer unit 800 can transfer the wastewater from the coagulation area A2 to the pressurization floating area A3, and for this purpose, a second wastewater transfer pipe 810 connecting the coagulation area A2 and the pressurization floating area A3. ) Can be included. A pump or the like may be installed in the second wastewater transfer pipe 870. However, the present invention is not necessarily limited thereto, and the wastewater in the condensation area A2 may be moved in an overflow manner.

The sludge discharge unit 900 may discharge sludge deposited on the bottom surface of the first container unit 110 to the outside of the first container unit 110.

For example, a depression 111 in which sludge is collected may be formed on the bottom surface of the first container 110, and the sludge discharge portion 900 is connected to the depression 111 to discharge the sludge. It may include a transfer pipe 910, and an on-off valve 920 installed in the sludge transfer pipe 910. In addition, the bottom surface of the first container part 110 may include an inclined part 113 extending downward from the inner surface of the first container part 110 to the recessed part 111 in order to facilitate sludge collection. .

A scum conveying pipe 660 is connected to the sludge conveying pipe 910, and the scum may be discharged together with the sludge.

In the above, description has been made based on a preferred embodiment of the present invention, but this is only an example and does not limit the present invention. Those of ordinary skill in the art to which the present invention pertains will be able to variously modify and change the embodiments by adding, changing, deleting or adding components within the scope not departing 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: Single reaction tank pressurized flotation system
110: first container part 111: depression
113: inclined portion 120: second container portion
121: curved swash plate 123: swash plate fixing portion
130: bulkhead 131: through hole
133: guide member 200: wastewater supply unit
210: first wastewater transfer pipe 220: hopper
230: mixer 300: coagulant supply unit
310: coagulant transfer pipe 400: stirring unit
410: stirrer 420: motor
500: pressurized water supply unit 510: pressurized water storage tank
511: window 513: water level sensor
515: second pressurized water transfer pipe 517: on-off valve
520: first treated water transfer pipe 530: air transfer pipe
540: first pressurized water transfer pipe 541: pipe
543: flow meter 545: flow control valve
600: scum removal unit 610: annular frame
611: rack gear 620: roller
630: drive motor 631: pinion gear
640: scraper 650: scum box
660: scum transfer pipe 700: treated water discharge unit
710: annular pipe 711: outlet hole
720: second treated water transfer pipe 800: wastewater transfer unit
810: wastewater transfer pipe 900: sludge discharge unit
910: sludge transfer pipe 920: on-off valve

Claims (10)

A first container with an open top surface;
A second container part disposed inside the first container part and having an open top surface;
A partition wall extending upward from the bottom surface of the second container part, dividing the inner space of the second container part into a columnar chemical reaction area and an annular aggregation area, and having a plurality of through holes;
A wastewater supply unit connected to the chemical reaction region through a bottom surface of the second container unit;
A coagulant supply unit for supplying a coagulant to the chemical reaction zone;
A stirrer disposed within the chemical reaction zone to stir the wastewater mixed with a coagulant;
A pressurized water supply unit for supplying pressurized water in which air is dissolved to a pressurized floating area formed between the first container unit and the second container unit;
A scum removal unit for removing scum floating above the pressurized area; And
A treated water discharge unit connected to a lower portion of the pressurized floating area to discharge the remaining treated water from the wastewater to the outside of the first container unit,
The pressurized water supply unit,
Pressurized water storage tank;
A first treated water transfer pipe connected to a lower portion of the pressurized floating area to supply treated water to the pressurized water storage tank;
An air transfer pipe supplying air to the pressurized water storage tank; And
And a first pressurized water transfer pipe connected to the pressurized water storage tank, penetrating the lower side of the first container part, and connected to the pressurized floating area,
A curved swash plate extending inclined downward is coupled to the lower outer surface of the second container part,
The first pressurized water transfer pipe is a single reaction tank type pressurized floating system for injecting pressurized water toward the upper surface of the curved swash plate. The method of claim 1,
Single reaction tank pressurized flotation system further comprising a wastewater transfer unit for transferring the wastewater from the coagulation area to the pressurized flotation area. The method of claim 1,
Further comprising a sludge discharge unit for discharging the sludge deposited on the bottom surface of the first container to the outside of the first container,
The bottom surface of the first container part includes a recessed part spaced apart from the inner surface of the first container part, and an inclined part extending downward from the inner surface of the first container part to the recessed part,
The sludge discharge unit,
A sludge transfer pipe connected to the depression; And
Single reaction tank pressure floatation system comprising an on-off valve installed in the sludge transfer pipe. The method of claim 1,
The partition wall has a circular pipe shape,
A single reaction tank pressure flotation system in which a hollow, truncated guide member for reducing the diameter of the through hole is coupled to the outer surface of the partition wall. The method of claim 1,
The wastewater supply unit,
A first wastewater transfer pipe passing through the bottom surface of the second container and connected to the chemical reaction zone;
A hopper coupled to the upper outlet of the first wastewater transfer pipe; And
A mixer rotatably coupled to the upper outlet side of the first wastewater transfer pipe, and rotates by the flow of wastewater discharged from the first wastewater transfer pipe to the hopper,
The coagulant supply unit, a single reaction tank pressure flotation system including a coagulant transfer pipe passing through a side surface of the hopper and supplying a coagulant to the inner space of the hopper. delete delete The method of claim 1,
The treated water discharge unit,
An annular pipe disposed below the second container and having a plurality of outlet holes; And
A single reaction tank type pressurized floating system including a second treated water transfer pipe connected to the annular pipe and extending to the outside of the first container part. The method of claim 8,
The curved swash plate is disposed on the annular pipe to block the sludge settling toward the bottom surface of the first container from flowing into the annular pipe. The method of claim 1,
The scum removing unit,
An annular frame disposed on the pressure floating area and extending along the pressure floating area;
A plurality of rollers coupled to an upper end of the first container to support the annular frame;
A drive motor having a pinion gear engaged with a rack gear formed in a circumferential direction in the annular frame, and rotating the annular frame;
A scraper coupled to the annular frame and disposed above the pressure floating area;
A scum box disposed above the pressurized floating area to collect the scum transferred by the scraper; And
A single reaction tank pressurized floating system comprising a scum conveying pipe connected to the scum box.

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