JP4281732B2 - 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. 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. 18 is a longitudinal sectional view showing the tank body shown in FIG. 1 of the same publication, and FIGS. 19 and 20 are arrangement relationships between the mixed water pipe and the drain pipe shown in FIGS. 2 and 3 of the publication. 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.

  The treated water from which the sludge has been separated descends along the vertical wall 99 opposite to the partition wall 83 and is taken out of the tank from the take-out portion 98 through the lower advection port 97.

Although this Japanese Patent Publication No. 7-38984 does not describe the use of agglomerated treated water as waste water, it is possible to subject the agglomerated treated water to pressure levitation separation treatment as disclosed in JP-A-7-290042 and the like. It is well known. In Japanese Patent Application Laid-Open No. 7-290042, a treatment water introduction portion is provided on one end side of the levitation chamber, and a treatment water outlet is provided on a lower portion of the vertical wall on the other end side.
Japanese Patent Publication No. 7-38984 JP-A-7-290042

  In the pressurized flotation separation apparatus of the above Japanese Patent Publication No. 7-38984, sludge rises while the water that has entered the flotation separation chamber 84 over the partition wall 83 flows into the flotation separation chamber 84. As shown in FIG. 18, a downward flow is generated along the vertical wall on the side opposite to the inflow portion, so that a part of sludge that could not be lifted down descends along with the downward flow, and is taken out through the advection port 97. 98 may flow out. In this way, when the sludge flows out from the advection port 97, the quality of the treated water decreases.

  Similarly, in Japanese Patent Application Laid-Open No. 7-290042, since a treated water extraction part is provided at the lower part of the vertical wall on the side opposite to the inflow part, some sludge is mixed with the treated water along with the downward flow. .

  In the present invention, even if some sludge descends along the vertical wall on the opposite side to the inflow portion, the lowered sludge is prevented from being mixed into the treated water, and the pressurized flotation separation improves sludge separation efficiency. An object is to provide an apparatus.

  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 a pressurized flotation separation apparatus provided with a floating part take-out part and a treated water take-out part at a lower part, the treated water take-out part is provided at a lower part of the floating separation chamber between the one end side and the other end side. Is provided , and an enclosure surrounding the side periphery and the upper side of the treated water outlet is provided . The enclosure is a box-like body having an open bottom, and at least a part of the lower edge of the enclosure The treated water flows into the inside of the enclosure through a gap provided between the bottom surface of the floating separation chamber or a hole provided in a side surface of the enclosure. To do.

  The pressurized levitation separation apparatus according to claim 2 is the pressure levitation separation apparatus according to claim 1, wherein the treated water extraction portion is disposed in the middle of the one end side and the other end side in the flotation separation chamber or at one end side thereof. It is a feature.

A pressurized floating separation apparatus according to a third aspect is the pressure floating separation apparatus according to the first or second aspect, wherein a mixing chamber and the floating separation chamber are installed by partitioning a tank body by a partition, and the mixing chamber includes the partition , It is surrounded by the partition wall facing it and the wall surface of the tank body, and at the central portion in the width direction at the lower part of the partition wall, there is provided an advection port for allowing the treated water to flow into the mixing chamber, The width of the advection port is 3 to 50% of the width of the partition wall, and the partition wall rises from the bottom surface of the tank body, and the upper end thereof is located lower than the water surface level of the tank body. The inflow part through which water flows out from the mixing chamber to the floating separation chamber is formed on the upper side of the partition, and the bottom of the mixing chamber is close to the partition and near the center in the width direction of the partition Is provided with a pressurized water discharge port that discharges pressurized water in which gas is dissolved upward. Cage, the partition wall is substantially vertical with the exception of the upper, upper portion of the partition wall is inclined to the mixing chamber side, said pressurized water discharge ports, disposed vertically lower region of the upper portion of the inclined partition wall The pressurized water discharge port is arranged in the central region of the three regions when the tank body is divided into three equal parts in the width direction of the partition wall .

  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 dividing the tank body by a partition wall and the partition wall, The partition wall is disposed between the mixing chamber and the mixing chamber, the partition wall is disposed between the mixing chamber and the floating separation chamber, and approximately in the center of the partition wall in the width direction at a lower portion of the partition wall It is preferable that 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.

  In the pressurized flotation separation apparatus of the present invention (Claim 1), the take-out portion of the treated water is arranged in the middle of one end side and the other end side of the flotation separation chamber, and the side periphery and the upper side of this take-out portion are arranged. Surrounded by an enclosure. For this reason, even if a part of sludge descends along with the vertical wall on the opposite side to the inflow portion, the sludge is prevented from reaching the extraction portion by the enclosure. Thereby, the separation efficiency of sludge improves.

  As described in claim 2, it is more reliable that the sludge flows out to the take-out portion by arranging the take-out portion of the treated water in the middle of the one end side and the other end side of the floating separation chamber or on the inflow side thereof. Be blocked.

  That is, as shown in FIG. 2 described later, the downward flow in the floating separation chamber occurs along the vertical wall on the side opposite to the inflow portion. This downward flow reverses at the lower part of the vertical wall and flows toward the inflow portion while gradually rising. The sludge that descends with the downward flow also rises with the reverse flow. For this reason, it is prevented more reliably that sludge flows out to an extraction part by separating an extraction part from this vertical wall, and arrange | positioning close to an inflow part.

  In the pressurized flotation separation apparatus according to claim 3, since pressurized water is discharged upward from the vicinity of the partition wall at the bottom of the mixing chamber, the vertical circulation having an upward flow along the partition wall is generated 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 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 3, 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.

  According to a preferred embodiment of the present invention, when the upper portion of the partition wall is inclined toward the mixing chamber, 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 floated and separated. It is prevented from flowing out into the chamber in a short-circuiting manner, and air bubbles adhere to the floc 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.

  Further, 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 of the partition wall upper portion so that the flow direction changes away from the partition wall. become. Therefore, it is possible to reliably prevent the rising water from overcoming the partition wall and flowing into the floating separation chamber.

  When the pressurized water discharge port is arranged at the center in the width direction of the partition wall at the bottom of the mixing chamber, an upward flow is formed at the center in the width direction of the mixing chamber, and after the upward flow finishes rising, the width direction As a result, the circulation flow is uniformly formed in the entire mixing chamber, and the agglomerated reaction water and the pressurized water are remarkably mixed.

  In the pressurized flotation separation apparatus of the present invention, the tank body is partitioned by the partition wall and the partition wall, so that the aggregation reaction chamber, the mixing chamber, and the flotation 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 a width direction of the partition wall is disposed below the partition wall. 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 in the vicinity of the center, may be provided.

  In this case, the coagulation reaction water in the coagulation reaction chamber flows into the mixing chamber through the outlet at the lower part of the partition wall, and flows toward the partition wall along the bottom surface of the 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 (a) is a longitudinal sectional view in the longitudinal direction of the pressurized flotation separating apparatus according to the embodiment, FIG. 1 (b) is a longitudinal sectional view taken along the line BB of FIG. Is a schematic view showing the flow of water in the floating separation chamber, FIGS. 3 to 6 are perspective views showing examples of the shape of the enclosure, FIGS. 7 to 9 are perspective views of the treated water outlet, 11 and 12a are perspective views showing other examples of the arrangement of the enclosures, FIG. 12b is a cross-sectional perspective view showing the configuration in the vicinity of the partition wall, FIG. 13 is a cross-sectional view showing the circulation state of water in the mixing chamber, and FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13, and FIG. 15 is a sectional view taken along line XV-XV 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 circulation state of water 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 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 near the center in the width direction is larger than both sides 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.

  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 receiving chamber 32 is provided outside the upper portion of the vertical wall 30t opposite to the second partition 2.

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

  The clean water (treated water) is extracted by an extraction pipe 36 from an extraction part 35 provided in the middle of the levitation separation chamber 30 in the front-rear direction, preferably in the middle of the front-rear direction or on the second partition wall 2 side. The water level adjustment tank 37 is taken out. This water level adjustment tank is for adjusting the water level in the tank body 3.

  Next, the structure of the extraction body 35 and the surrounding body 40 that surrounds the entire circumference and upper side thereof will be described.

The enclosure 40 used in this embodiment is as shown in FIG. 3, and the take-out portion 35 is as shown in FIG. The take-out portion 35 is formed of a cylindrical pipe that is horizontal and sealed at both ends, and is installed so that the direction of the cylinder axis is parallel to the partition wall 2. A plurality of intake ports 35a are provided on both side surfaces of the pipe in the front-rear direction.

  The enclosure 40 is a rectangular parallelepiped box-like body whose bottom is open, and is installed so that the longitudinal direction of the rectangular parallelepiped is the longitudinal direction of the extraction portion 35. The enclosure 40 surrounds the entire circumference and the upper side of the extraction portion 35. The bottom surface of the enclosure 40 is open.

  Legs 41 project downward from both ends of the enclosure 40, and the legs 41 abut on the bottom surface of the tank body 1. Thereby, an inflow portion 42 of the treated water is formed between the lower edges of the front and rear side surfaces of the enclosure 40 and the bottom surface of the floating separation chamber 30. An insertion hole 43 of the treated water extraction pipe 36 is provided on the ceiling surface of the enclosure 40.

  In the levitation separation chamber 30 in which the extraction portion 35 surrounded by the enclosure 40 is provided in the lower part of the levitation separation chamber 30 and in the middle or on the second partition 2 side as shown in FIG. In addition, mainly, the inflow water from the inflow portion 24 flows horizontally on the upper surface of the floating separation chamber 30, then descends along the vertical wall 30t, eventually reverses, and flows toward the inflow portion 24 while gradually rising. Circulate like so.

  Since a downward flow is generated along the vertical wall 30t, a part of the sludge descends along with the downward flow, eventually reverses, and gradually rises toward the inflow portion 24. In this embodiment, the take-out portion 35 is arranged in the middle of the floating separation chamber 30 in the front-rear direction or closer to the second partition wall 2 side, so that the sludge accompanying the circulating flow is not transferred to the take-out portion 35. Hardly reach.

  In addition, since the entire side periphery and upper side of the extraction portion 35 are surrounded by the surrounding body 40, the sludge does not reach the extraction portion 35 at all or almost. For this reason, high quality treated water is obtained from the take-out part 35.

  In the envelope body 40 of FIG. 3, the leg portions 41 are plate-like, but rod-like leg portions 41A may be provided at the four corners like the envelope body 40A of FIG. Further, like the enclosures 40B and 40C in FIGS. 5 and 6, a notch 44 is provided at the lower edge of the box-like enclosures 40B and 40C so that the treated water flows into the enclosures 40B and 40C. Also good.

  The envelopes 40 to 40B have a rectangular shape in plan view, but may be a square or a polygon. The enclosure 40C is cylindrical, but the shape in plan view may be elliptical. The shape of the notch 44 may be other than illustrated. A hole may be provided instead of the notch 44. The notch 44 and the hole may be provided on the other side surface of the enclosure.

  The take-out portion 35 is cylindrical as shown in FIG. 7, but it may be a rectangular tube or the like like the take-out portion 35A in FIG. 8, and the shape in plan view is like the take-out portion 35B in FIG. May be circular, or may be elliptical or polygonal in plan view.

  If a plurality of cutouts 44 and holes are provided, the linear velocity of water flowing into the extraction portion is reduced, and sludge is hardly sucked into the extraction portion.

  In the present invention, the treated water extraction pipe 36 may extend downward from the extraction portion, and the treated water may be taken out below the tank body 3.

  In the present invention, as shown in FIG. 10, the enclosure 40 and the extraction portion 35 may be disposed in the immediate vicinity of the second partition wall 2. In addition, as shown in FIG. 11, the longitudinal direction of the enclosure 40 and the extraction portion 35 may be orthogonal to the wall surface of the second partition wall 2.

  In addition, although an example of the suitable dimension of each part in this embodiment and an operating condition is demonstrated below, this invention is not limited to this.

  When the enclosure is arranged in parallel with the second partition 2 as shown in FIGS. 1 and 10, the longitudinal dimension of the enclosure 40 is the width of the tank 3 (width in the direction parallel to the second partition 2). ) Is preferably 100% to 100%, more preferably 70% to 100%. Further, if 100%, the enclosure 40 comes into contact with both side surfaces 3a of the tank body 3 as shown in FIG. This is more preferable because it can be a reinforcing member. When the enclosure 40 is provided so as to contact both side surfaces 3a of the tank body 3, the partition wall 2 may be provided so as to rise from the upper part of the enclosure 40 as shown in FIG. 12a. Forty legs 41 may be omitted. The height h of the gap 42 and the notch 44 is preferably equal to or greater than the average particle size of the floc flowing into the floating separation chamber 30, and is usually preferably about 10 to 30 mm. The height of the enclosure is preferably in the range of (h + d) to (h + 3d), where d is the tube diameter of the extraction portion 35.

  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. 16. 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 agglutination reaction chamber 10, the mixing chamber 20, and the bottom surface are at the same level, but the bottom of the agglomeration reaction chamber 10 may be deepened.

  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 pressurized levitation separator according to the embodiment. It is explanatory drawing of the flow of the water in a floating separation chamber. It is a perspective view of an enclosure. It is a perspective view of an enclosure. It is a perspective view of an enclosure. It is a perspective view of an enclosure. It is a perspective view of an extraction part. It is a perspective view of an extraction part. It is a perspective view of an extraction part. It is a perspective view which shows the installation state of an enclosure. It is a perspective view which shows the installation state of an enclosure. It is a perspective view which shows the installation state of an enclosure. 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. It is the XIV-XIV sectional view taken on the line of FIG. It is the XV-XV sectional view taken on the line of FIG. 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 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 16, 16 'Advection 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 (3)

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, the extraction portion of the levitated matter is provided on the other end side, and the treatment water extraction portion is provided in the lower portion,
The treated water extraction part is disposed in the lower part of the floating separation chamber in the middle between the one end side and the other end side,
An enclosure surrounding the side periphery and the upper side of the treated water outlet is provided ,
The enclosure consists of a box-like body with an open bottom,
The treated water flows into the inside of the enclosure through a gap provided between at least a part of the lower edge of the enclosure and the bottom surface of the floating separation chamber, or a hole provided in a side surface of the enclosure. A pressurized levitation separator characterized by being configured as described above.   2. The pressurized flotation separation device according to claim 1, wherein the treated water take-out section is disposed in the middle of the one end side and the other end side in the flotation separation chamber or at one end side of the one end side. In claim 1 or 2, the mixing chamber and the floating separation chamber are installed by dividing the tank body by a partition wall,
The mixing chamber is surrounded by the partition wall, a partition wall facing the partition wall, and the wall surface of the tank body,
At the center in the width direction of the lower part of the partition wall, an advection port for allowing the water to be treated to flow into the mixing chamber is provided, and the width of the advection port is 3 to 50% of the width of the partition wall,
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,
Of the bottom of the mixing chamber, a pressurized water discharge port is provided near the partition and near the center in the width direction of the partition to discharge pressurized water in which the gas is dissolved upward .
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 water discharge port is disposed in a vertically lower region of the upper portion of the inclined partition wall,
The pressurized levitation separator according to claim 1, wherein the pressurized water discharge port is arranged in a central region of the three regions when the tank body is divided into three equal parts in the width direction of the partition wall .

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