JP5071395B2 - Pressure floating separator - Google Patents

Description

  The present invention relates to a pressurized flotation separation device that floats and separates a suspension by adding pressurized water in which a gas is dissolved to raw water. More specifically, the present invention relates to a pressurized flotation separation device that adds pressurized water to a water to be treated such as agglomeration reaction water that has been agglomerated by a flocculant, and in particular, a pressurized flotation separation device. The present invention relates to a pressurized flotation separation apparatus that is partitioned to form a mixing chamber and a flotation separation chamber.

  Japanese Patent Publication No. 7-38984 discloses a pressurized flotation separation apparatus in which a tank body is partitioned by a partition to form a mixing chamber and a flotation separation chamber. FIG. 16 is a longitudinal sectional view showing the tank body shown in FIG. 1 of the same publication, and FIGS. 17 and 18 are arrangement relationships between the mixed water pipe and the drain pipe shown in FIGS. FIG.

  The inside of the tank body 81 is divided into a mixing chamber 82 and a floating separation chamber 84 by a partition wall 83. Drainage is introduced downward into the mixing chamber 82 via a drainage introduction pipe 85 protruding from the mixing chamber wall surface 82 a opposite to the partition wall 83. Note that the end of the drainage introduction pipe 85 has a T-shape, and drainage flows downward in a curtain shape from a slit-like opening 86 for drainage outflow extending in the horizontal direction.

  The pressurized water in which the air is dissolved is supplied into the mixing chamber 82 from the pressurized water pipe 88 in the horizontal direction. The end of the pressurized water pipe 88 is also T-shaped, and a large number of discharge ports 89 are opened in the lateral direction. The pressurized water pipe 88 is provided below the drainage introduction pipe 85. The drainage flows out from the drainage introduction pipe 85 downward and in a curtain shape, flows downward along the side surface 82a of the mixing chamber 82, and pressurized water is added from the pressurized water pipe 88 along the way to merge. The combined water flows in a direction away from the mixing chamber wall surface 82 a, then rises along the partition wall 83, and circulates in the mixing chamber 82. A part of the water in the course of circulation flows out to the floating separation chamber 84 so as to get over the upper end of the partition wall 83 and is subjected to the floating separation process. The sludge that has been levitated and separated is scraped out by the scraper 90 to the scraper receiver 91 and discharged.

  This Japanese Patent Publication No. 7-38984 does not describe the point of using agglomerated treated water as waste water, but it is possible to subject the agglomerated treated water to pressure flotation separation treatment as disclosed in JP-A-64-34487. It is well known.

Japanese Patent Publication No. 7-38984 JP-A-64-34487

  In the pressurized floating separator of the above Japanese Patent Publication No. 7-38984, pressurized water is added in the horizontal direction and merged with the wastewater discharged downward in a curtain shape from the wastewater introduction pipe 85. Therefore, the downward drainage flow from the drainage introduction pipe 85 is changed in the horizontal direction, and the drainage tends to be separated from the mixing chamber wall surface 82a before reaching the mixing chamber bottom surface 82b. In addition, since the pressurized water discharged in the horizontal direction has a low specific gravity and contains a large amount of bubbles, the pressurized water separated from the mixing chamber wall surface 82a starts to rise before reaching the partition wall 83. For this reason, the flow along the partition wall 83 in the circulating flow in the mixing chamber 82 is weakened, and the circulation in the corners in the mixing chamber 82 is likely to be insufficient, and flocs with insufficient bubble adhesion are likely to occur.

  In order to allow the waste water flowing downward from the waste water introduction pipe 85 to reach the mixing chamber bottom surface 82b, it is conceivable to increase the introduction speed of the waste water. However, in this way, the water combined with the pressurized water is relatively high speed. Collides with the mixing chamber bottom surface 82b. For this reason, the bubbles attached to the sludge in the drainage are easily separated from the sludge due to the impact at the time of collision with the mixing chamber bottom surface 82b.

  In addition, it is conceivable to reduce the outflow rate from the opening 89 of the pressurized water pipe 88 and thereby maintain the downward drainage flow direction from the drainage introduction pipe 85. However, if the discharge rate of the pressurized water is reduced in this way, The pressurized water simply flows along the curtain-like downward flow of the drainage, and the pressurized water and the drainage are not sufficiently mixed.

  For this reason, the pressurized flotation separation apparatus of Japanese Patent Publication No. 7-38984 is difficult to cause bubbles to adhere sufficiently to the sludge, and the flotation separation efficiency is not sufficiently high.

  An object of the present invention is to provide a pressurized flotation separation apparatus in which bubbles are sufficiently attached to sludge in the water to be treated, and the flotation separation process can be performed efficiently.

The pressurized flotation separation apparatus according to claim 1 is a pressurized flotation separation apparatus for subjecting the water to be treated to a pressure flotation separation process, and the mixing chamber and the flotation separation chamber are installed by partitioning the tank body by a partition wall, An outflow port is provided at the bottom of the mixing chamber to allow the water to be treated to flow toward the partition. The partition rises from the bottom surface of the tank body, and its upper end is the water level of the tank body. Is located below the partition wall, whereby water flows out from the mixing chamber to the floating separation chamber through the upper side of the partition wall, and the partition wall is substantially vertical except for the upper part, The upper part of the partition wall is inclined to the mixing chamber side, and is a vertically lower region of the upper part of the inclined partition wall among the bottom part of the mixing chamber , and a region between the outlet and the partition wall In addition, a pressurized water discharge port that discharges pressurized water in which gas is dissolved upward is arranged. And which is characterized in that the extraction means are provided for floating sludge 該浮 on separation chamber.

Floatation on separation apparatus according to claim 2, Oite to claim 1, the agglutination reaction chamber by said tank body is partitioned by a partition wall and the partition wall, and the mixing chamber, and the said flotation chamber this The partition wall is disposed between the agglomeration reaction chamber and the mixing chamber, the partition wall is disposed between the mixing chamber and the floating separation chamber, and the partition wall is disposed below the partition wall. The outlet for allowing the agglomerated reaction water to flow out from the agglomeration reaction chamber along the bottom surface of the mixing chamber, which is present in the vicinity of the center in the width direction of the wall, is provided. .

  In the pressurized flotation separation apparatus of the present invention (Claim 1), since pressurized water is discharged upward from the vicinity of the partition wall at the bottom of the mixing chamber, upward flow along the partition wall is generated in the mixing chamber. The upper and lower circulation flow is formed. The treated water that has flowed into the mixing chamber through the outflow port flows toward the partition wall along the bottom surface of the mixing chamber due to the circulating flow.

  In the middle of this, pressurized water is discharged upward from the pressurized water discharge port at the bottom of the mixing chamber, and the water to be treated is mixed with the pressurized water. The mixed water rises along the partition wall and then circulates in the mixing chamber so as to descend along the wall surface of the mixing chamber on the opposite side of the partition wall. During this time, bubbles sufficiently adhere to the floc. This floc flows into the floating separation chamber through the upper side of the partition wall, and is subjected to the floating separation process.

In the pressurized flotation separation apparatus according to claim 2 , the agglomerated reaction water in the agglomeration reaction chamber flows into the mixing chamber through the outlet at the lower part of the partition wall, and moves toward the partition wall along the bottom surface of the mixing chamber. Flowing. Since the flow direction of the outflow water from the outlet matches the flow direction of the circulating flow along the bottom surface of the mixing chamber, the circulating flow velocity increases.

It is a longitudinal cross-sectional view of the longitudinal direction of the pressurized levitation separator according to the embodiment. It is a cross-sectional perspective view which shows the structure of a partition wall vicinity. It is sectional drawing which shows the circulation condition of the water in a mixing chamber. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV in FIG. 3. It is a cross-sectional perspective view of the partition wall vicinity which concerns on another embodiment. It is a section perspective view near the partition wall concerning another embodiment. It is a longitudinal cross-sectional view of the longitudinal direction of the pressurization floating separator which concerns on different embodiment. It is a cross-sectional perspective view of the partition wall vicinity of FIG. It is a cross-sectional perspective view which shows the structure of a partition wall vicinity. It is the XI-XI sectional view taken on the line of FIG. It is a block diagram which shows another example of an outflow port. It is a block diagram which shows another example of an outflow port. (A) The figure is a cross-sectional perspective view which shows the structure of a partition wall vicinity, (b) A figure is the BB sectional drawing of (a) figure. (A) A figure is a longitudinal cross-sectional view of the longitudinal direction of the pressurization flotation separation device concerning a reference example , (b) A figure is a perspective view near a nozzle. It is sectional drawing which shows a prior art example. It is a perspective view which shows the waste_water | drain introduction pipe | tube and pressurized water pipe | tube of FIG. It is sectional drawing which shows the waste_water | drain introduction pipe | tube and pressurized water pipe | tube of FIG.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view in the longitudinal direction of a pressurized flotation separation apparatus according to an embodiment, FIG. 2 is a sectional perspective view showing a configuration near a partition wall, and FIG. 3 shows a circulation state of water in a mixing chamber. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line VV in FIG.

  The inside of the tank body 3 having a substantially rectangular shape in plan view is partitioned by the partition wall 1 and the partition wall 2, whereby the agglomeration reaction chamber 10, the mixing chamber 20, and the floating separation chamber 30 are formed in this order. The chambers 10, 20, and 30 are arranged in the longitudinal direction of the tank body 3, and the partition wall 1 and the partition wall 2 are extended in the short direction, that is, the width direction of the tank body 3.

  An outlet 16 for communicating the chambers 10 and 20 is formed at the center in the width direction at the bottom of the partition wall 1. The upper end of the partition wall 1 extends upward from the water surface between the tank bodies 3.

  The partition wall 2 is erected from the tank bottom surface 3 b, and the upper end thereof is lower than the water surface between the tank bodies 3.

  Each wall 1, 2 is connected to both side surfaces 3a of the tank body.

  Raw water is introduced into the agglomeration reaction chamber 10 through the raw water pipe 11, and a flocculant and an alkali agent can be supplied through the supply pipes 12 and 13. A pH meter 14 for detecting the pH of water in the agglomeration reaction chamber 10 is installed, and an alkaline agent injection pump (not shown) is operated so that the detected value of the pH meter 14 falls within a predetermined range.

  As the flocculant, various organic flocculants as well as inorganic flocculants such as PAC can be used, and two or more flocculants may be used in combination. A predetermined amount of the flocculant is added by a flocculant drug pump (not shown). The water in the agglomeration reaction chamber 10 is gently agitated by the agitator 15 and agglomerated.

  The agglomerated water flows into the mixing chamber 20 through the outlet 16 and flows along the tank bottom surface 3b in the vicinity of the center in the width direction of the mixing chamber 20. In the tank bottom surface 3b, a nozzle 23 for discharging pressurized water is provided in the center in the width direction and relatively close to the partition wall 2. The tip of the nozzle 23 slightly protrudes from the tank bottom surface 3b, but is not limited to this.

  In this embodiment, water is taken out from the lower part of the floating separation chamber 30 through the pipe 21, and the pressurized water production apparatus 22 is pressurized and dissolved, and this pressurized water is supplied to the nozzle 23. Here, although the water for pressurized water is taken out from the lower part in the levitation separation chamber 30, the working water and the clean water from the pipe 35 may be taken out and used, and there is no particular limitation.

  In this embodiment, the nozzle 23 is disposed in a vertically lower region of an inclined partition upper portion 2b described later. In this embodiment, only one nozzle 23 is provided at the center of the tank bottom surface 3b in the width direction.

  The agglomerated water from the outlet 16 and the pressurized water from the nozzle 23 rise mainly along the vicinity of the center in the width direction of the partition wall 2 while being mixed. The partition wall 2 is a vertical part 2a that is substantially vertical (preferably within ± 10 ° with respect to the vertical surface) except for the upper part 2b, and the upper part 2b is inclined toward the partition wall 1 side.

  The upward flow flows substantially vertically upward along the vertical portion 2 a of the partition wall 2. Next, the upward flow is guided by the inclined partition upper part 2 b to change the flow direction toward the partition wall 1, and becomes a downward flow that descends along the partition wall 1 when reaching the vicinity of the partition wall 1. The downward flow that has flowed to the lower part of the partition wall 1 flows toward the partition wall 2 on the bottom surface 3 b of the tank body while merging with the agglomerated water from the outlet 16. In this way, a vertical circulation flow is formed in the mixing chamber 2 as shown in FIG. During the circulation, fine bubbles generated from the pressurized water adhere to the aggregated floc.

  The water circulation state in the mixing chamber will be described in more detail with reference to FIGS.

  Aggregated treated water flows into the mixing chamber 20 from the outflow port 16, and the inflowed water flows toward the partition wall 2 near the center in the width direction of the tank body along the tank body bottom surface 3 b.

  Pressurized water is added upward from the nozzle 23 to the flow along the tank bottom surface 3b. Since the nozzle 23 is disposed relatively close to the partition wall 2, the flow of the upward pressure water flow that overlaps the partition wall 2 and the upward flow of the pressurized water flow overlap each other. In the vicinity of the central portion in the vicinity of the tank body width direction, an upward flow having a relatively high flow velocity is formed partially upward. In the vicinity of both sides of the partition wall 2, an upward flow having a relatively low flow rate is formed, or when the width of the mixing chamber 20 is large, a downward flow is formed.

  The upward flow along the vicinity of the center in the width direction of the partition wall 2 hits the inclined partition upper part 2b and changes the flow direction toward the partition wall 1 to flow near the water surface of the mixing chamber 20 toward the partition wall 1, but the partition wall 2 Since the ascending flow velocity in the vicinity of the center in the width direction is larger than that in the width direction, the flow toward the partition wall 1 flows from the center in the width direction near the partition wall 2 to both sides in the width direction of the partition wall 1 as shown in FIG. And then descends along the partition wall 1 and flows toward the partition wall 2 so as to converge in the vicinity of the center of the tank bottom surface 3b in the width direction along with the flow from the outlet 16. Then, when reaching the vicinity of the partition wall 2, it rises along the partition wall 2 so that the center in the width direction has a high flow velocity as described above.

  Thus, in the mixing chamber 2, in addition to the vertical circulation of the upward flow along the partition wall 2 and the downward flow along the partition wall 1, after rising along the partition wall 2, it spreads in the width direction as it separates from the partition wall 2, Next, after descending along the partition wall 1, vertical and horizontal circulation flows are formed in which the circulation in the width direction converging at the center in the width direction is superimposed. For this reason, in the mixing chamber 2, the flocculated water and the pressurized water are mixed evenly.

  Moreover, since the partition wall upper portion 2b is inclined toward the partition wall 1 and the upward flow along the partition wall 2 changes the flow direction toward the partition wall 1, the rising water crosses over the partition wall 2 in a short-circuited manner and floats up. No flow to 30.

  As a result, the agglomerated water and the pressurized water are sufficiently mixed and air bubbles are sufficiently attached to the floc, and then the floc is supplied to the floating separation chamber 30 so that the floc is efficiently levitated and separated.

  The floated flock is discharged to a sludge receiving chamber 32 by a scraper 31 such as a skimmer or a scraper and taken out via a discharge pipe 33.

  The sludge that has settled in the floating separation chamber 30 is discharged through the pipe 34.

  The clean water is extracted from the midway in the vertical direction of the floating separation chamber 30 by the pipe 35, and is taken out through a water level adjusting tank (not shown). This water level adjustment tank is for adjusting the water level in the tank body 3.

  Although examples of suitable dimensions and operating conditions in the embodiment shown in FIGS. 1 to 5 will be described below, the present invention is not limited to this.

  The vertical dimension of the outlet 16 is preferably 40 to 250 mm or about 5 to 30% of the water depth. The width of the outlet 16 is preferably about 3 to 50% of the width of the partition wall 1, and more preferably 6 to 20%.

  The volume of the mixing chamber 20 is preferably about 2 to 30% of the volume of the floating separation chamber 30.

  The distance between the upper end of the partition wall 2 and the water surface is preferably 50 to 240 mm or about 5 to 30% of the water depth.

  The inclination angle of the upper part 2b of the partition wall 2 from the vertical is preferably about 30 to 60 °.

  The horizontal distance between the uppermost end of the partition wall 2 (the upper end of the partition wall upper part 2b) and the partition wall 1 is 20 to 200 mm, or the longitudinal length of the floating chamber 24 (the mixing chamber 20 and the floating separation chamber 30 are combined to form a floating chamber). About 2 to 10% of the thickness is preferable.

  The average ascending flow velocity between the uppermost end of the partition wall 2 and the partition wall 1 is preferably about 0.01 to 0.1 m / sec.

  The vertical length of the inclined upper portion 2b of the partition wall 2 is preferably 30 to 300 mm, or about 5 to 30% of the total height of the partition wall 2 in the vertical direction.

  The protrusion length of the nozzle 23 from the bottom surface of the mixing chamber is preferably about 50 to 400 mm or about 5 to 30% of the total height of the partition wall 2 in the vertical direction.

  The nozzle 23 is a straight tube, and it is preferable that a pressure reducing valve is provided below the tank bottom surface 3b. The nozzle 23 above the pressure reducing valve is preferably a straight straight tube until reaching the upper end.

  In the above embodiment, the outlet 16 is formed of a square opening, but it may be semicircular or semielliptical like the opening 16 'of FIG. In addition, although not shown, it may be a circle, a horizontally long ellipse, or a polygon.

  In this embodiment, since the bottom surface of the agglomeration reaction chamber 10 and the bottom surface of the mixing chamber 20 are flush with each other, the agglomerated water from the agglomeration reaction chamber 10 flows along the tank bottom surface 3b without disturbing the flow. It passes through the outlet 16 and flows in the center in the width direction along the bottom surface of the mixing chamber 20.

  In order to prevent this flow from spreading laterally or upward, a relatively short tunnel-shaped guide member 40 may be connected to the outlet 16 as shown in FIG.

  In the above embodiment, the bottom surface of the agglomeration reaction chamber 10, the mixing chamber 20, and the bottom surface are at the same level. However, as in each of the embodiments of FIGS. The deep portion 50 may be deepened to provide the deep portion 50, and the deep portion 50 and the mixing chamber 20 may be communicated with each other by the upward outlet 51.

  FIG. 8 is a longitudinal sectional view in the longitudinal direction of the pressurized flotation separator having the deep portion 50 and the outlet 51, and FIG. 9 is a perspective sectional view of the vicinity of the outlet 51 as seen from the mixing chamber 20 side. In the embodiment shown in FIGS. 8 and 9, the outlet 51 is provided at a position along the center of the bottom surface of the mixing chamber 20 in the width direction of the partition wall 1. The outflow port 51 extends in the vertical direction along the vertical surface 50 </ b> A on the mixing chamber 20 side of the deep portion 50, and communicates with the vicinity of the bottom surface of the deep portion 50.

  The other configurations of the pressurized levitation separator of FIGS. 8 and 9 are the same as those in the above embodiment, and the same reference numerals indicate the same parts.

  8 and 9, the agglomerated reaction water from the agglomeration reaction chamber 10 flows upward from the outlet 51 along the partition wall 1 into the mixing chamber 20. However, in this mixing chamber 20, the discharge water flow of the pressurized water from the nozzle 23 is stronger than the outflow water flow from the outlet 51, and the same circulation as that shown in FIGS. A stream is formed and thoroughly mixed.

  As shown in FIGS. 10 and 11, a guide member 40 may be provided for changing the flow direction of the condensed reaction water from the outlet 51 to a direction along the bottom surface of the mixing chamber 20. FIG. 10 is a perspective sectional view of the vicinity of the outlet 51 provided with the guide member 40, and FIG. 11 is a sectional view taken along the line XI-XI of FIG. Other configurations in FIGS. 10 and 11 are the same as those in FIG. 9, and the same reference numerals indicate the same parts.

  The guide member 40 has a tunnel shape having the same shape as that in FIG. 7 and has a substantially horizontal square top surface. As the guide member, the one shown in FIG. 12 or FIG. 13 is used. It may be used.

  FIGS. 12 (a) and 13 (a) are cross-sectional views of the same portion as FIG. 11 near the outlet provided with the guide members 40A and 40B, FIGS. 12 (b) and 13 (b). Is a perspective view of the guide members 40A and 40B, and FIG. 12 (c) is a dimensional view of the vicinity of the outlet of FIG. 12 (a).

  The guide member 40A of FIG. 12 has an upper surface that is inclined so that the upper surface becomes higher as it is separated from the partition wall 1. The side view shape of the guide member 40A is trapezoidal, but the connection position between the guide member 40A and the partition wall 1 is at the same level as the bottom surface of the mixing chamber 20, and the side view shape of the guide member 40A is triangular. Also good.

  The crossing angle (slant angle) θ between the upper surface of the guide member 40A and the partition wall 1 is preferably 30 to 60 °, particularly about 40 to 50 °.

  The ratio a / b between the distance a from the corner of the outlet 51 to the ceiling surface of the guide member 40A and the front-rear dimension b of the outlet 51 shown in FIG. 12 (c) is 0.7 to 1.3, particularly about 1. About 0.0 is preferable.

  In the guide member 40B of FIG. 13, the ceiling surface is a quadrant arc-shaped curved surface, and the side view shape is a quadrant. The guide member 40B has a small resistance to the flow from the outlet 51 and smoothly changes the flow of the agglomerated reaction water toward the bottom of the mixing chamber.

  FIG. 14 (a) is a perspective sectional view showing an embodiment in which the deep portion 50 is extended to the lower side of the mixing chamber 20 and an outlet 51 is provided in the vicinity of the crossing corner between the partition wall 1 and the bottom surface of the mixing chamber 20. FIG. 14 (b) is a sectional view taken along line BB of FIG. 14 (a). The outlet 51 is provided across the partition wall 1 and the bottom surface of the mixing chamber 20, but may be provided only on the bottom surface of the mixing chamber 20. Although not shown, a guide member may be provided at the outlet 51. Other reference numerals in FIG. 14 denote the same parts as in the above embodiment.

  FIG. 15 (a) is a longitudinal sectional view in the longitudinal direction of a pressurized flotation separator in which the agglomerated reaction water in the agglomeration reaction chamber 10 is guided to the mixing chamber 20 by a conduit 60, and FIG. 15 (b) is a nozzle. FIG.

  The upstream end of the conduit 60 is connected to the lower part of the aggregation reaction chamber 10, and the downstream end is connected to the bottom surface of the mixing chamber 20. The downstream end is directed upward and is arranged coaxially with the nozzle 23. The nozzle 23 is disposed in the vertical direction in the axial center of the conduit 60, and the agglomerated reaction water passes into the mixing chamber 20 through the outlet 61 between the outer peripheral surface of the nozzle 23 and the inner peripheral surface of the conduit 60. Spills upward. Other configurations of the pressurized flotation separation apparatus of FIG. 15 are the same as those of the embodiment of FIGS.

According to the reference example of FIG. 15, the flow of the agglomerated reaction water from the outlet 61 matches the discharge direction of the pressurized water from the nozzle 23, so the upward flow along the partition wall 2 in the mixing chamber 20 is increased. A strong circulating flow is formed in the mixing chamber 20.

  In FIG. 15, a pipe-like conduit 60 is provided, but the present invention is not limited to this.

  In the above embodiment, only one nozzle 23 is provided, but two or more nozzles may be provided. The nozzle 23 is preferably provided in the vicinity of the center in the width direction of the bottom surface of the mixing chamber, and particularly preferably provided in the center in the width direction, but may be slightly shifted to one side in the width direction. However, when the tank body 3 is divided into three equal parts in the width direction, it is preferable that the nozzle is arranged in the central region excluding the left and right. A nozzle is preferably arranged in the region.

  A plurality of nozzles may be installed at intervals in the tank body longitudinal direction. Also in this case, it is preferable that all the nozzles are arranged in a vertically lower region of the partition upper portion 2b.

  The apparatus of the present invention is suitable for aggregation, pressurization, and flotation separation of SS-containing water having an oil content and a relatively small specific gravity, but can be used for other various wastewater treatment.

DESCRIPTION OF SYMBOLS 1 Partition wall 2 Partition 3 Tank body 10 Aggregation reaction chamber 15 Stirrer 16, 16 ', 51 Outlet 20 Mixing chamber 22 Pressurized water production apparatus 23 Nozzle 30 Floating separation chamber 31 Scraper 40, 40A, 40B Guide member

Claims (2)

In a pressurized levitation separation apparatus for subjecting water to be treated to levitation separation,
By dividing the tank body by a partition wall, a mixing chamber and a floating separation chamber are installed,
An outlet is provided at the bottom of the mixing chamber and for allowing the water to be treated to flow toward the partition.
The partition wall rises from the bottom surface of the tank body, and the upper end of the partition wall is positioned lower than the water surface level of the tank body, whereby water flows out from the mixing chamber to the floating separation chamber through the upper side of the partition wall. And
The partition is substantially vertical except for the upper part,
The upper part of the partition wall is inclined toward the mixing chamber side,
A pressurized water discharge port that discharges pressurized water, in which gas is dissolved, upward in a vertically lower region of the upper portion of the inclined partition wall in the bottom of the mixing chamber and between the outlet and the partition wall Is placed,
A pressurization flotation separation apparatus, wherein the flotation separation chamber is provided with means for taking out the sludge. In Claim 1, the agglomeration reaction chamber, the mixing chamber, and the floating separation chamber are installed in this order by partitioning the tank body by a partition wall and the partition wall,
The partition wall is disposed between the agglomeration reaction chamber and the mixing chamber;
The partition is disposed between the mixing chamber and the floating separation chamber,
The outlet for allowing the agglomeration reaction water to flow out from the agglomeration reaction chamber along the bottom surface of the mixing chamber, which is present in the vicinity of the center of the partition wall in the width direction, is provided at the lower part of the partition wall. A pressure levitation separator characterized by comprising:

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