JP2007152283A - Pressure flotation separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure flotation separation apparatus which prevents sludge in water to be treated from flowing into an outlet by a shortcut and enables an efficient flotation separation treatment. <P>SOLUTION: The water subjected to flocculation treatment flows into a mixing chamber 20 through an outflow port 16, flows along the center in the width direction of a tank main body bottom face 3b, and rises along a partition wall 2 while the water subjected to flocculation treatment and pressurized water from a nozzle 23 are intermingled with each other. A rising flow is guided by the upper part 2b of the inclined partition wall to change a flow direction to the side of another partition wall 1 and then descend along the partition wall 1 when it reaches the vicinity of the partition wall 1. The flow directing from the upper end of the partition wall 2 to the partition wall 1 branches to both sides in the width direction of the partition wall 1 from around the center in the width direction in the vicinity of the partition wall 2. A baffle 29 made of a plurality of rod-like bodies 28 is provided in a flotation separation chamber 30 around an inflow part 24 to disperse inflow water. <P>COPYRIGHT: (C)2007,JPO&INPIT

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. One embodiment of 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 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 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 scraper receiver 91 and discharged.

  The treated water from which the sludge has been separated is taken out of the tank from the take-out section 98 through the advection port 97.

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 levitation separation apparatus of the above Japanese Patent Publication No. 7-38984, the water that has flowed over the partition wall 83 and has flowed into the levitation separation chamber 84 circulates in the levitation separation chamber 84 as shown by the arrows in FIG. . Therefore, there is a possibility that the water that has flowed into the floating separation chamber 84 from the partition wall 83 flows out to the take-out section 98 through the advection port 97 in a short circuit. Thus, when the water from an inflow part flows in a short circuit, the separation efficiency of sludge will fall and the quality of treated water will fall.

  An object of the present invention is to provide a pressurized flotation separation device in which water is prevented from flowing in a short circuit from an inflow portion to an extraction portion in a flotation separation chamber and sludge separation efficiency is improved.

  In the pressurized floating separator of the above Japanese Patent Publication No. 7-38984, the pressurized water is added in the horizontal direction and merged with the wastewater discharged downward in a curtain shape from the drainage 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.

  In one aspect of the present invention, 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 has a flotation separation chamber for subjecting the water to be treated to flotation separation, and an inflow portion of the treatment water is provided on one end side of the flotation separation chamber. In the pressurized flotation separation apparatus provided with the floating portion take-out portion, in the flotation separation chamber, in the vicinity of the inflow portion, in a direction crossing the one end side and the other end side, in a substantially horizontal direction. A baffle comprising a plurality of extending rod-shaped bodies is provided.

  According to a second aspect of the present invention, the baffle is provided with a plurality of columns provided with a plurality of rod-like bodies having different vertical heights, and provided with a plurality of rows at different distances from the inflow portion. Of the two adjacent columns, at least one rod-shaped body constituting the column farther from the inflow portion constitutes the column closer to the distance from the inflow portion It is characterized by being arranged at a substantially intermediate height between two adjacent rod-shaped bodies.

  According to a third aspect of the present invention, there is provided the pressurized flotation separation apparatus according to the first aspect, wherein the baffle is provided with a plurality of columns provided with a plurality of rod-like bodies having different vertical heights and a plurality of rows provided with different distances from the inflow portion. Of the two adjacent columns, at least one rod-shaped body constituting the column farther from the inflow portion constitutes the column closer to the distance from the inflow portion The lower rod-shaped body of the two adjacent rod-shaped bodies is disposed at a position lower by 0 to 1/3 times the distance between the two adjacent rod-shaped bodies. It is what.

  According to a fourth aspect of the present invention, there is provided the pressurized flotation separation apparatus according to the first to third aspects, wherein the mixing chamber and the flotation separation chamber are provided by partitioning the inside of the tank body by a partition wall, the lower part of the mixing chamber, and An advection port is provided to allow the water to be treated to flow toward the center in the width direction of the partition wall. The partition wall rises from the bottom surface of the tank body, and its upper end is lower than the water surface level of the tank body. The inflow portion through which water flows out from the mixing chamber to the floating separation chamber is formed on the upper side of the partition wall, and the bottom portion of the mixing chamber is close to the partition wall and the A pressurized water discharge port is provided at a position near the center in the width direction of the partition wall to discharge pressurized water in which gas is dissolved upward.

  The pressurized levitation separator according to claim 5 is characterized in that, in claim 4, the partition is substantially vertical except for the upper portion, and the upper portion of the partition is inclined toward the mixing chamber. It is.

  A pressurized floating separator according to a sixth aspect of the present invention is the pressurized floating separator according to the fifth aspect, wherein the pressurized water discharge port is disposed in a vertically lower region of the upper portion of the inclined partition wall.

  According to a seventh aspect of the present invention, there is provided the pressurized floating separation apparatus according to the sixth aspect, wherein the pressurized water discharge port is disposed at the center in the width direction of the partition wall at the bottom of the mixing chamber.

  The pressurized flotation separation apparatus according to claim 8 is the flotation separation apparatus according to any one of claims 4 to 7, wherein the tank body is partitioned by a partition wall and the partition wall, whereby the agglomeration reaction chamber, the mixing chamber, and the flotation device are separated. A separation chamber is disposed in this order, the partition wall is disposed between the aggregation reaction chamber and the mixing chamber, the partition wall is disposed between the mixing chamber and the floating separation chamber, In the lower part, the advection port for allowing the agglomeration reaction water to flow out from the agglomeration reaction chamber along the bottom surface of the mixing chamber is provided near the center of the partition wall in the width direction. It is what.

  In the pressurized flotation separation apparatus of the present invention (Claim 1), a baffle is provided in the flotation separation chamber, and water is prevented from flowing in a short circuit from the inflow part to the extraction part. Thereby, the separation efficiency of sludge improves.

  As the baffle, as shown in claim 2, a plurality of columns provided with a plurality of rod-like bodies with different vertical heights are provided with a plurality of columns with different distances from the inflow portion, and two adjacent columns Among them, at least one rod-like body constituting the column on the side farther from the inflow portion constitutes the column on the side closer to the inflow portion, and is substantially between the two adjacent rod-like bodies. In the case of a configuration arranged at a height, the inflow water from the inflow portion is sufficiently dispersed by the baffle.

  Further, as the baffle, as in claim 3, a plurality of columns provided with a plurality of rod-like bodies with different vertical heights are provided with different distances from the inflow portion. Of at least one rod-shaped body constituting the column on the side farther from the inflow portion of the columns of the two adjacent rod-shaped bodies constituting the column on the side closer to the inflow portion. In the case where it is configured to be disposed at a position lower than the height of the lower rod-shaped body by a distance of 0 to 1/3 times the interval between the two adjacent rod-shaped bodies, The flow from the inflow portion to the diagonally downward direction is efficiently dispersed by the baffle.

  In the pressurized flotation separation apparatus according to claim 4, since pressurized water is discharged upward from the vicinity of the partition wall at the bottom of the mixing chamber, upward and downward circulation having an upward flow along the partition wall in the mixing chamber. A 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 by the circulation 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 4, the water to be treated flows out from the advection port to the vicinity of the center in the partition wall width direction, mainly in the vicinity of the center in the width direction on the bottom surface of the mixing chamber. It flows toward the partition. Pressurized water discharged upward from the discharge port is added to the flow of water to be treated along the vicinity of the center in the width direction of the bottom surface of the mixing chamber. Both the advection port and the discharge port are provided near the center in the width direction in the bottom of the mixing chamber, and are not provided in the entire width direction. Therefore, the pressurized water discharged from the discharge port and the water to be treated along the vicinity of the center in the width direction of the bottom surface of the mixing chamber are sufficiently mixed. Moreover, since the discharge direction of the pressurized water is an 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.

  Since 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.

  If the upper part of the partition wall is inclined toward the mixing chamber as in claim 5, the flow direction is changed so that the water rising along the partition wall is separated from the partition wall, so that the water in the mixing chamber is short-circuited to the floating separation chamber. Outflow is prevented and air bubbles adhere to the flocs very well. 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 the pressurized water discharge port is provided in the vertically lower region of the upper part of the inclined partition wall as in claim 6, the upward flow caused by the pressurized water discharged from the discharge port hits the inclined part of the partition wall upper part and moves away from the partition wall. It will change the flow direction. Therefore, it is possible to reliably prevent the rising water from overcoming the partition wall and flowing into the floating separation chamber.

  According to the pressure levitation separator of claim 7, an upward flow is formed at the center in the width direction in the mixing chamber, and after the upward flow has finished rising, the upward flow is equally divided in the width direction. The circulation flow is uniformly formed in the entire mixing chamber, and the agglomeration reaction water and the pressurized water are remarkably mixed.

  In the pressurized flotation separation apparatus according to claim 8, 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.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 (a) is a longitudinal sectional view in the longitudinal direction of the pressurized flotation separation apparatus according to the embodiment, and FIG. 1 (b) is a longitudinal section in the direction perpendicular to the longitudinal direction of the rod-shaped body showing the arrangement of baffles in the flotation separation chamber. FIG. 2 is a sectional perspective view showing the structure near the partition wall, FIG. 3 is a sectional view showing the circulation state of water in the mixing chamber, FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5 is a cross-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 advection port 16 that communicates the chambers 10 and 20 is formed at the center in the width direction of the lower portion 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 advection port 16, and flows along the tank bottom surface 3 b in the vicinity of the center of the mixing chamber 20 in the width direction. 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 advection port 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 tank bottom surface 3 b while joining with the agglomerated water from the advection port 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 advection 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 advection port 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 20, 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 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 climbs over the partition wall 2 in a short circuit, and the partition wall 2 The flow does not flow to the floating separation chamber 30 through the upper inflow portion 24.

  As described above, after the flocculated water and the pressurized water are sufficiently mixed and bubbles are sufficiently adhered to the floc, the floc-containing water flows into the floating separation chamber 30 from the inflow portion 24.

  A baffle 29 composed of a plurality of rod-like bodies 28 is provided in the vicinity of the inflow portion 24 in the floating separation chamber 30.

  Each rod-shaped body 28 is constructed between one side surface 3a of the tank body 3 and the other side surface 3a. Each rod-like body 28 extends horizontally in a direction perpendicular to the paper surface of FIG.

In this embodiment, the baffle 29 includes a first row L ₁ of the rod-like body 28 arranged in two upper and lower stages in the most inflow section 24 side, the second column L ₂ arranged in three vertical stages adjacent thereto The rod-shaped body 28 and the rod-shaped body 28 in the third row L ₃ arranged in the upper and lower three stages farthest from the inflow portion 24 are configured.

Of those middle of the second row L ₂ of the rod-like body 28, positioned substantially mid-height of the first row L ₁ of the rod-like body 28, the third column L ₃ of the uppermost and middle of the bar-like member 28 is located approximately midway the height of the second column _{L 2} of the rod-shaped body 28, 28.

The diameter of the rod-shaped body 28 is preferably about 10 to 100 mm, particularly about 20 to 60 mm. The distance between the rows L ₁ , L ₂ and L ₃ is preferably about 20 to 300 mm, particularly about 50 to 200 mm. The vertical distance H of the rod-shaped body 28 is preferably about 20 to 300 mm, particularly about 50 to 200 mm.

  In addition, the number of the rod-shaped body 28 in this embodiment is an example, and is not limited to this. The number of rows of rod-like bodies 28 is preferably 2 to 10, particularly about 3 to 5. The number of rod-shaped bodies in one row is preferably about 2 to 10. In addition, the number of the rod-like bodies 28 in the row closest to the inflow portion 24 is preferably about 2 to 4, and is preferably about 0 to 8 more than that in the second row.

  In FIG. 1 (b), water tends to flow from the upper left to the lower right of the figure. Therefore, as shown in FIG. 1 (c), a part of, for example, the third row of rod-like bodies 28 may be arranged at the same height as the second row of rod-like bodies 28 on the preceding stage side. Further, as shown in FIG. 19, a part of, for example, the third row of rod-shaped bodies 28 is set to 0 to 0 of the interval H between the rod-shaped bodies in the second row from the height of the second row of rod-shaped bodies 28 on the front side. You may arrange | position in the position low by the distance of 1/3 time (for example, 1/4 time of H).

  As described above, since the air bubbles are sufficiently attached to the floc flowing into the floating separation chamber 30 through the inflow portion 24, the floating speed of the floc is high.

  In this embodiment, since the baffle 29 is provided, the water flowing into the floating separation chamber 30 from the inflow portion 24 is dispersed by the baffle 29 and is taken out from the inflow portion 24 into the floating separation chamber 30 ( No or almost no circulating flow toward the sludge receiving chamber 32 side). As a result, the water from the inflow portion 24 is prevented from flowing into the sludge receiving chamber 32 in a short circuit, and the floc is sufficiently separated from the floating material.

  The floc that has floated in the floating separation chamber 30 is discharged to the sludge receiving chamber 32 by a scraper 31 such as a skimmer or a scraper, and is 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 middle of the levitation separation chamber 30 in the front-rear direction and in the vertical direction by the pipe 35 and is taken out through a water level adjustment 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 other than the baffle 29 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 advection port 16 is preferably 40 to 250 mm or about 5 to 30% of the water depth. The width of the advection port 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 (upper end of the partition wall upper part 2b) and the partition wall 1 is about 20 to 200 mm, or about 2 to 10% of the longitudinal length of the mixing chamber 20 and the floating separation chamber 30 combined. Is preferred.

  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 advection port 16 is formed of a square opening, but may be semicircular or semi-elliptical like the advection port 16 ′ in FIG. 6. 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 advects without disturbing the flow along the tank bottom surface 3b. It passes through the mouth 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 advection port 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 provided to provide a deep portion 50, and the deep portion 50 and the mixing chamber 20 may be communicated with each other by an upward advection port 51.

  FIG. 8 is a longitudinal sectional view in the longitudinal direction of the pressurized flotation separation apparatus having the deep portion 50 and the advection port 51, and FIG. 9 is a perspective sectional view of the vicinity of the advection port 51 as viewed from the mixing chamber 20 side. In the embodiment of FIGS. 8 and 9, the advection port 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 advection 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 out from the advancing port 51 along the partition wall 1 into the mixing chamber 20 upward. 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 advection port 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 outflow direction of the agglomerated reaction water from the advection port 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 advection port 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 edge of the advection port 51 to the ceiling surface of the guide member 40A and the front-rear dimension b of the advection port 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 advection port 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 advection port 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 advection port 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 advection port 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 embodiment of FIG. 15, since the flow of the condensed reaction water from the outlet 61 and the discharge direction of the pressurized water from the nozzle 23 match, the upward flow along the partition wall 2 in the mixing chamber 20 is accelerated. As a result, 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, and 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 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 apparatus concerning another embodiment, (b) The 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. It is a longitudinal cross-sectional view of the rod-shaped body longitudinal direction and the orthogonal | vertical direction which shows the arrangement | sequence of the baffle in the floating separation chamber of the pressurized floating separation apparatus which concerns on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Partition wall 2 Partition 3 Tank body 10 Aggregation reaction chamber 15 Stirrer 16, 16 ', 51 Transfer port 20 Mixing chamber 22 Pressurized water production apparatus 23 Nozzle 24 Inflow part 28 Rod-shaped body 29 Baffle 30 Floating separation chamber 31 Scraper 40, 40A, 40B Guide member

Claims (8)

A floating separation chamber for subjecting the water to be treated to pressurized floating separation;
In the pressurized flotation separation apparatus in which the inflow portion of the water to be treated is provided on one end side of the flotation separation chamber and the extraction portion of the levitated matter is provided on the other end side,
A baffle comprising a plurality of rod-like bodies extending in a direction that intersects the direction connecting the one end side and the other end side and is substantially horizontal is provided in the floating separation chamber in the vicinity of the inflow portion. Pressurized floating separator.   2. The baffle according to claim 1, wherein the baffle is provided with a plurality of columns provided with a plurality of rod-like bodies with different vertical heights, and provided with a plurality of rows with different distances from the inflow portion. Among them, at least one rod-like body constituting the column on the side farther from the inflow portion constitutes the column on the side closer to the inflow portion, and is substantially between the two adjacent rod-like bodies. A pressurized flotation separation device characterized by being arranged at a height.   2. The baffle according to claim 1, wherein the baffle is provided with a plurality of columns provided with a plurality of rod-like bodies with different vertical heights, and provided with a plurality of rows with different distances from the inflow portion. Among the two adjacent rod-shaped bodies, at least one rod-shaped body constituting the column on the side far from the inflow portion constitutes the column on the side near the distance from the inflow portion. A pressure levitation separation apparatus, which is disposed at a position lower by 0 to 1/3 times the interval between two adjacent rod-like bodies than a height of a lower rod-like body. In Claim 1 thru | or 3, a mixing chamber and the said floating separation chamber are installed by dividing the tank body by a partition,
An advection port is provided in the lower part of the mixing chamber and for flowing out the water to be treated toward the vicinity of the center of the partition in the width direction.
The partition wall rises from the bottom surface of the tank body, and the upper end thereof is positioned lower than the water surface level of the tank body, whereby the inflow from which water flows out from the mixing chamber to the floating separation chamber above the partition wall. Part is formed,
A pressurized water discharge port is provided in the bottom of the mixing chamber near the partition and near the center in the width direction of the partition to discharge pressurized water in which gas is dissolved upward. Pressed levitation separator. In Claim 4, the partition is substantially vertical except the upper part,
The pressurized flotation separation device, wherein an upper portion of the partition wall is inclined toward the mixing chamber side.   6. The pressurized levitation separator according to claim 5, wherein the pressurized water discharge port is disposed in a vertically lower region of the upper portion of the inclined partition wall.   7. The pressurized levitation separator according to claim 6, wherein the pressurized water discharge port is disposed at the center in the width direction of the partition wall at the bottom of the mixing chamber. In any one of Claims 4 thru | or 7, when the said tank body is divided by the partition wall and the said partition, the aggregation reaction chamber, the said mixing chamber, and the said floating separation chamber are installed in this order,
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 advection port 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 near 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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