JP2008049227A - Floatation separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flotation separation apparatus capable of making air bubbles sufficiently stick to sludge in water to be treated and efficiently carrying out flotation separation treatment. <P>SOLUTION: Flocculation-treated water flows in a mixing chamber 20 through an outflow port 51 and flows breadthways along a center of the bottom face 3b of a tank body. The flocculation-treated water and pressurized water from a nozzle 23 ascend along a partition wall 2 while being mixed together. The ascending flow is guided to the inclined top part 2b of the partition wall, changes a flow direction on the partition wall 1 side and descends along the partition wall 1 when reaching the vicinity of the partition wall 1. The flow from the top end of a partition wall 2 to the partition wall 1 is provided as flow branched breadthways from around the center in the vicinity of the partition wall 2 to both sides in a width direction of the partition wall 1. It is configured that a rise is not generated on the water surface by a discharge water force from the nozzle 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressurized flotation separation apparatus that adds pressurized water in which gas is dissolved to water to be treated in a mixing chamber to form mixed water, and flows the mixed water into a flotation separation chamber to float and separate a suspended substance. More specifically, the present invention relates to a pressurized flotation separation apparatus that adds pressurized water to a water to be treated such as agglomeration reaction water that has been agglomerated by a flocculant, and performs a pressure flotation separation process, particularly from the upper part of a mixing chamber. The present invention relates to a pressurized flotation separation device configured to allow mixed water to flow into 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 downward and in a curtain shape from the drainage introduction pipe 85, 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, and merges. 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 scraped material receiver 91 and discharged.

This Japanese Patent Publication No. 7-38984 does not describe the point of using the agglomerated treated water as the waste water, but as described in JP-A No. 64-34487, etc. It is well known.
JP 7-38984 JP-A-64-34487

  In the pressurized floating separator of the above Japanese Patent Publication No. 7-38984, the pressurized water is discharged from the discharge port 89 of the pressurized water pipe 88 substantially horizontally. Since this pressurized water has a low specific gravity and contains a large amount of bubbles, it rises in the mixing chamber 82 and a circulation flow is formed in the mixing chamber 82. However, since the discharge direction of the pressurized water is horizontal, the upward flow Of the circulating flow in the mixing chamber 82, the flow along the partition wall 83 is weakened, the circulation in the corner of the mixing chamber 82 is likely to be insufficient, and a floc with insufficient bubble adhesion may occur. is there.

  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.

  In the pressurized flotation separation apparatus according to claim 1, a mixing chamber which mixes the water to be treated and the pressurized water supplied from the pressurized water discharge port to form mixed water, and the mixed water flowing out from the upper portion of the mixing chamber are introduced. In the pressurized flotation separation apparatus having the flotation separation chamber, the pressurized water discharge port is installed at the bottom of the mixing chamber so as to discharge the pressurized water into the mixing chamber substantially vertically upward, from the pressurized water discharge port. The distance to the water surface of the mixing chamber is characterized in that, at a predetermined average discharge flow rate and average discharge flow rate of pressurized water, the water surface rises due to the discharge of pressurized water.

  A pressurized floating separator according to a second aspect of the present invention is the pressurized floating separator according to the first aspect, wherein the pressurized water discharge port has a tapered shape whose diameter increases toward the tip.

  According to a third aspect of the present invention, there is provided the pressurized flotation separation apparatus according to the first or second aspect, wherein the mixing chamber and the flotation separation chamber are provided by partitioning the tank body by a partition wall, and the partition wall is a bottom surface of the tank body. The upper end is located lower than the water surface level of the tank body, whereby the mixed water flows out from the mixing chamber to the floating separation chamber through the upper side of the partition wall. Is substantially vertical except for the upper part, the upper part of the partition wall is inclined toward the mixing chamber, and the pressurized water discharge port is disposed in the vertically lower region of the upper part of the inclined partition wall. It is characterized by.

A pressurized levitation separator according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the pressurized water discharge flow rate is 1 to 10 m ³ / hr.

  The pressurized levitation separator according to claim 5 is characterized in that, in any one of claims 1 to 4, the average discharge flow velocity from the pressurized water discharge port is 0.1 to 5 m / s. .

  The pressurized levitation separation apparatus according to claim 6 is the pressure levitation separation apparatus according to claim 3, wherein the tank body is partitioned by a partition wall and the partition wall, so that the agglomeration reaction chamber, the mixing chamber, and the levitation separation chamber are installed in this order. 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 coagulation reaction water as the water to be treated flows out from the coagulation reaction chamber, which exists in the vicinity of the center in the width direction, along the bottom surface of the mixing chamber toward the center of the width direction of the lower part of the partition wall. An outlet is provided, and the pressurized water discharge port is arranged near the center in the width direction of the tank body.

In any one of Claims 1 thru | or 6, it is preferable that the distance from the said pressurized water discharge port to the water surface of this mixing chamber is more than the distance prescribed | regulated by (1) Formula.
Distance (m) = Pressurized water discharge flow rate (m ³ /hr)×0.15+0.32 (1)

Moreover, in any one of Claims 1 thru | or 6, it is preferable that the distance from the pressurized water discharge port of the said pressurized water pipe to the water surface of this mixing chamber is below the distance prescribed | regulated by (2) Formula.
Distance (m) = Pressurized water discharge flow rate (m ³ /hr)×0.15+0.92 (2)

  In the pressurized levitation separation apparatus of the present invention, since pressurized water is discharged upward from the pressurized water discharge port, the buoyancy due to the pressurized water discharge water force and the low specific gravity of the pressurized water is superimposed in the mixing chamber, resulting in a strong rise. A flow is generated, and a vertical circulation flow is formed over a wide range in the mixing chamber. Accordingly, the water to be treated that has flowed into the mixing chamber is sufficiently mixed with the pressurized water in the mixing chamber by the circulation flow. The mixed water circulates in the mixing chamber, and during this time, bubbles sufficiently adhere to the floc. This floc flows from the upper part of the mixing chamber into the floating separation chamber and is subjected to the floating separation process.

  In the present invention, the position (water depth) of the pressurized water discharge port is set to a certain level deep so that the pressure of the pressurized water discharged from the discharge port does not raise the mixing chamber water surface, so that the bubbles strongly hit the water surface. Bubbles are prevented from disappearing, and a short-circuit flow in the floating separation chamber is suppressed. Thereby, the floating separation efficiency is improved.

However, if the depth of the pressurized water discharge port is excessively deep, the circulation in the mixing chamber may be weakened. Therefore, the water depth position of the pressurized water discharge port is [the discharge flow rate of pressurized water (m ³ / hr) from the water surface of the mixing chamber. × 0.15] is preferably in a range obtained by adding 0.32 to 0.92 m.

Similarly, when the average discharge flow rate from the pressurized water discharge port is low, the rise of the water surface is suppressed, but when it is too low, the circulation in the mixing chamber is weakened. On the other hand, if the flow rate is too large, it is not preferable because the water depth in the mixing chamber needs to be excessively deep. For this reason, the average discharge flow rate from the pressurized water discharge port is preferably 0.1 to 5 m / s.
By forming the pressurized water discharge port into a tapered shape whose diameter increases toward the tip, it is possible to softly mix the pressurized water and the water to be treated while suppressing the rise of the water surface.

  In the pressurized flotation separation apparatus of the present invention, the water to be treated flows out from the outlet to the vicinity of the center in the partition wall width direction, mainly from the bottom of the mixing chamber to the partition wall. It is preferable to flow in the opposite direction. It is preferable that pressurized water discharged upward from the discharge port is added to the flow of the water to be treated along the vicinity of the center in the width direction of the bottom surface of the mixing chamber. Further, it is preferable that both the outlet and the outlet are provided in the vicinity of the center in the width direction in the bottom of the mixing chamber and are not provided in the entire width direction.

  When comprised in this way, the pressurized water discharged from the discharge outlet and the to-be-processed water along the width direction center vicinity of the bottom face of a mixing chamber fully mix. Moreover, since the discharge direction of the pressurized water is the upward direction and the pressurized water has a low specific gravity containing a large amount of bubbles, the mixed water of the water to be treated and the pressurized water flows smoothly upward along the partition walls.

  When the discharge port is provided near the center in the width direction, the upward flow in the mixing chamber is strongest near the center in the width direction near the partition. The upward flow rising near the center changes the flow direction away from the partition at the upper part of the mixing chamber, but at this time, the flow direction is dispersed in the width direction of the partition. As a result, the circulating water flow in the mixing chamber does not simply circulate in the vertical direction, but repeatedly separates and merges in the partition wall width direction in the middle of this circulation. Mix well with water. As a result, a sufficient amount of bubbles are attached to the floc.

  When the upper part of the partition wall is inclined toward the mixing chamber, the flow direction of the water rising along the partition wall changes away from the partition wall, so that the water in the mixing chamber is prevented from flowing out into the floating separation chamber. As a result, the bubbles adhere to the flocs very sufficiently. In addition, since it is substantially vertical except the upper part of a partition, the water in a mixing chamber rises smoothly along this partition with the pressurized water discharged upward from the discharge outlet.

  If a pressurized water discharge port is provided in the vertically lower region above the inclined partition wall, the upward flow caused by the pressurized water discharged from the discharge port hits the inclined portion at the upper part of the partition wall and changes the flow direction away from the partition wall. . Therefore, it is possible to reliably prevent the rising water from overcoming the partition wall and flowing into the floating separation chamber.

  In the pressurized flotation separation apparatus of the present invention, the agglomeration reaction chamber, the mixing chamber, and the flotation separation chamber are installed in this order by partitioning the tank body by the partition wall and the partition wall, and the aggregation The partition wall is disposed between the reaction chamber and the mixing chamber, the partition wall is disposed between the mixing chamber and the levitation separation chamber, and the partition wall is disposed substantially below in the width direction of the partition wall. An outlet is provided so that the agglomerated reaction water as the treated water flows out from the agglomeration reaction chamber located near the center along the bottom surface of the mixing chamber toward the center in the width direction of the lower part of the partition wall. The pressurized water discharge port may be arranged near the center in the width direction of the tank body.

  If comprised in this way, the aggregation reaction water in an aggregation reaction chamber will flow in into a mixing chamber through the outflow port of the lower part of a partition wall, and will flow toward a partition along the bottom face of this mixing chamber. 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.

  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.

The upper end of the partition wall 1 extends upward from the water surface between the tank bodies 3.
In this embodiment, the bottom of the agglomeration reaction chamber 10 is deepened to provide a deep portion 50, and the deep portion 50 and the mixing chamber 20 are communicated by an upward outlet 51.

  Outflow port 51 is provided at a position along the vicinity of the center in the width direction of partition wall 1 on the bottom surface of mixing chamber 20. 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 agglomerated water from the agglomeration reaction chamber 10 passes through the outlet 51 without disturbing the flow, flows along the bottom surface of the mixing chamber 20 in the center in the width direction, and this flow spreads laterally and upward. In order to prevent this, a relatively short tunnel-shaped guide member 40 is provided at the outlet 51. The guide member 41 has a downward U-shaped cross-sectional shape, the rear end is connected to the partition wall 1, and the left and right side surfaces are connected to the bottom surface 3 b of the tank body 3. The guide member 41 is open toward the partition wall 2.
The outlet 51 is provided with an agglomeration aid addition pipe 52.

  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 agglomeration treatment water is added to the agglomeration aid from the deep part 50 at the outlet 51 and then flows into the mixing chamber 20 and flows along the tank bottom surface 3 b 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 is preferably flush with the tank bottom surface 3b, but may slightly protrude from the bottom surface 3b.

  In this embodiment, the nozzle 23 has a tapered shape whose diameter increases toward the tip. By adopting this shape, the discharge port diameter of the nozzle 23 can be increased, so that the discharge flow rate can be effectively reduced.

  In this embodiment, the water depth and the diameter of the nozzle 23, the pump capacity of the pressurized water production apparatus 22, and the like are set so that the pressurized water flowing upward from the nozzle 23 does not raise the water surface of the mixing chamber 20.

In addition, it is preferable that the water depth position of the front-end | tip of the nozzle 23 exists between [0.15Q + 0.32]-[0.15Q + 0.92] meter with respect to the discharge flow rate Q (m < ³ > / hr) of pressurized water. Moreover, the discharge flow rate of the pressurized water from the nozzle 23 is preferably 1 to 10 m ³ / hr. The average discharge flow rate of pressurized water from the nozzle 23 is preferably 0.1 to 5 m / s, and more preferably 0.1 to 1.2 m / s.

  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 51 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.

  In addition, the circulation state of the water in the mixing chamber 20 will be described in more detail with reference to FIGS.

  Aggregated treated water flows into the mixing chamber 20 from the outlet 51, and the inflowed water flows toward the partition wall 2 near the center in the width direction of the tank along the tank bottom surface 3 b.

  Pressurized water is added upward from the nozzle 23 to the flow along the tank bottom surface 3b. Since this nozzle 23 is disposed relatively close to the partition wall 2, the flow that changes the flow upwards against the partition wall 2 and the upward pressurized water flow overlap each other, thereby 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.

  In this embodiment, the water discharged from the nozzle 23 does not cause a rise in the water surface of the mixing chamber 20, so that the floc does not short-circuit over the partition wall 2 and flow into the floating separation chamber 30. Further, it is also possible to prevent the bubbles from disappearing due to the flock hitting the water surface strongly.

  Moreover, since the partition wall upper part 2b is inclined to the partition wall 1 side and the upward flow along the partition wall 2 changes the flow direction to the partition wall 1 side, the rising water crosses the partition wall 2 in a short-circuited manner and rises to the separation chamber. 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 by a pipe 35 from an outlet provided in the lower part of the floating separation chamber 30 and in the vicinity of the partition wall 2, and is taken out through a water level adjusting tank (not shown). The water level adjustment tank is for adjusting the water level in the tank body 3.

  The upper surface and the side surface of the clean water outlet are surrounded by an enclosure 35a, and the clean water flows between the lower end of the enclosure 35a and the bottom surface of the floating separation chamber 30 and flows into the enclosure 35a. By providing this enclosure 35a, it is more reliably prevented that flocks are mixed into clean water.

  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 opening (outflow part) where the guide member 40 opens toward the partition wall 2 is preferably 40 to 250 mm or about 5 to 30% of the water depth of the mixing chamber. Further, the width of the opening (outflow portion) 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 of the mixing chamber.

  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 (upper end of the partition wall upper part 2b) and the partition wall 1 is preferably 20 to 200 mm, or about 2 to 10% of the total length in the longitudinal direction of the mixing chamber 20 and the floating separation chamber 30. is there.

  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 nozzle 23 is preferably flush with the bottom surface of the mixing chamber.

  A pressure reducing valve is preferably provided in the line for supplying pressurized water to the nozzle 23.

  The agglomerated water from the agglomeration reaction chamber 10 passes through the outlet 51 without disturbing the flow, and flows in the center in the width direction along the bottom surface of the mixing chamber 20.

As described above, the water depth position of the tip (upper end) of the nozzle 23 is [0.15Q + 0.32] to [0.15Q + 0.92] meters, particularly [0.15Q + 0.4] to [0.15Q + 0.8] meters. preferable. When the water depth of the nozzle 23 is shallower than the above range, the water surface of the mixing chamber 20 is raised due to the discharge water flow of the nozzle 23, and the floc may flow out to the floating separation chamber 30 in a short circuit. On the other hand, when the nozzle water depth is deeper than the above range, the tank body becomes unnecessarily high, which causes a problem in terms of installation space and cost. The residence time in the mixing chamber 20 is preferably about 18 to 70 seconds.

  When the upper part of the partition wall 2 is inclined as in this embodiment, the surface extending vertically upward from the upper end of the partition wall 2 is treated as the boundary between the mixing chamber 20 and the floating separation chamber 30.

  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. 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 sides, particularly when the tank body is divided into five equal parts in the width direction. 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.

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 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Partition wall 2 Partition 3 Tank body 10 Aggregation reaction chamber 15 Stirrer 20 Mixing chamber 22 Pressurized water production apparatus 23 Nozzle 30 Floating separation chamber 31 Scraper 40 Guide member 50 Deep part 51 Outlet

Claims (6)

A mixing chamber in which the water to be treated and the pressurized water supplied from the pressurized water discharge port are mixed to form mixed water;
In a pressurized flotation separation device having a flotation separation chamber into which mixed water flowing out from the upper part of the mixing chamber is introduced,
The pressurized water discharge port is installed at the bottom of the mixing chamber so as to discharge pressurized water into the mixing chamber in a substantially vertical upward direction.
The distance from the pressurized water outlet to the water surface of the mixing chamber is greater than the distance at which the water surface rises due to the pressurized water discharge at a predetermined average discharge flow rate and average discharge flow rate of the pressurized water. Separation device.   2. The pressurized levitation separator according to claim 1, wherein the pressurized water discharge port has a tapered shape whose diameter is increased toward the tip. In claim 1 or 2,
By mixing the tank body with a partition wall, the mixing chamber and the floating separation chamber are installed,
The partition wall rises from the bottom surface of the tank body, and its upper end is positioned lower than the water surface level of the tank body, so that mixed water flows out from the mixing chamber to the floating separation chamber through the upper side of the partition wall. Is supposed to
The partition is substantially vertical except for the upper part,
The upper part of the partition wall is inclined toward the mixing chamber side,
The pressurized floating separator according to claim 1, wherein the pressurized water discharge port is disposed in a vertically lower region of the upper portion of the inclined partition wall. The pressurized levitation apparatus according to any one of claims 1 to 3, wherein the pressurized water discharge flow rate is 1 to 10 m ³ / hr.   The pressurized levitation apparatus according to any one of claims 1 to 4, wherein an average discharge flow rate from the pressurized water discharge port is 0.1 to 5 m / s. In Claim 3, the agglomeration reaction chamber, the mixing chamber, and the floating separation chamber are installed in this order by dividing the tank body by the 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 to-be-treated water is present in the lower part of the partition wall and in the vicinity of the center of the partition wall in the width direction from the aggregation reaction chamber toward the vicinity of the center of the partition wall in the width direction along the bottom surface of the mixing chamber. The outlet is provided so that the agglomeration reaction water flows out as
The pressurized levitation separator according to claim 1, wherein the pressurized water discharge port is disposed near the center in the width direction of the tank body.

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