JP2006223992A - Pressure floatation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure floatation device which makes flocculates in flocculation reaction water grow by a polymer coagulant aid, makes bubbles sufficiently adhere to the flocculates, and can perform efficient floatation separation. <P>SOLUTION: The flocculation reaction water passes through an outflow port 16 to flow into a mixing chamber 20, and flows along the width direction center of a tank body bottom 3b. After a polymer coagulant aid solution is added to the flocculation reaction water from a feed pipe 27, the water rises along a partition wall 2 while being mixed with pressurized water from a nozzle 23. The ascending flow is guided by the inclined upper part 2b of the partition wall to change its flow direction to a panel wall 1 side, and reaches the vicinity of the panel wall to descend along the panel wall 1. The flow from the upper end of the partition wall 2 toward the panel wall 1 is divided into both sides in the width direction of the panel wall 1 at the vicinity of the width direction center near the partition wall 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressurized flotation separation apparatus that adds pressurized water and a polymer agglomeration aid to agglomeration reaction water that has been agglomerated by a flocculant, and is divided into partitions by partition walls. The present invention relates to a pressurized flotation separation apparatus in which a mixing chamber and a flotation separation chamber are formed.

  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. 8 is a longitudinal sectional view showing the tank body shown in FIG. 1 of the same publication, and FIGS. 9 and 10 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.

Although this Japanese Patent Publication No. 7-38984 does not describe the point of using agglomerated treated water as drainage and the point of adding a polymer agglomeration aid, the agglomeration reaction water obtained by agglomerating suspended solids Japanese Patent Publication No. 3-12949 discloses that pressurized water and a polymer coagulant aid are added to a pipe for introduction into the pipe.
Japanese Patent Publication No. 7-38984 Japanese Patent Publication No. 3-12949

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

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

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

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

II. When the pressurized water and the polymer agglomeration aid are added to the agglomeration reaction water in the middle of the piping and introduced into the levitation tank as in the above Japanese Patent Publication No. 3-12949, the agglomeration reaction water, the pressurized water and the polymer agglomeration aid Since it flows into the levitation tank before the mixing is sufficiently performed, it is difficult to form a bubble-containing floc containing bubbles inside. Therefore, the floating separation efficiency of floc is not good.

  In the mixing chamber provided in the tank body, the present invention provides a bubble containing a large number of bubbles inside by sufficiently mixing and contacting the agglomerate in the agglomeration reaction water, the polymer agglomeration aid and the bubbles at the same time. It is an object of the present invention to provide a pressurized flotation separation apparatus that can form a contained floc and perform a flotation separation process efficiently.

  The pressurized flotation separation apparatus according to claim 1 is a pressurized flotation separation apparatus in which agglomeration reaction water and pressurized water are mixed in a mixing chamber and then flotation-separated in the flotation separation chamber. Thus, a mixing chamber and a floating separation chamber are installed, and 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. In the pressurized flotation separation apparatus in which water flows out from the mixing chamber to the flotation separation chamber, a pressurized water discharge port for discharging pressurized water in which a gas is dissolved is provided in the mixing chamber, The mixing chamber is provided with an adding means for adding a polymer coagulation aid.

  The pressurized levitation separator according to claim 2 is the pressurized floating separator according to claim 1, wherein the pressurized water discharge port is provided so as to discharge pressurized water upward in a vicinity of the partition wall in a bottom portion of the mixing chamber. An outlet for allowing the agglomerated reaction water to flow out to the lower part of the mixing chamber toward the pressurized water discharge port is provided.

  The pressurized levitation separator according to claim 3 is characterized in that, in claim 1 or 2, the partition wall is substantially vertical except for the upper part, and the upper part of the partition wall is inclined toward the mixing chamber. To do.

  According to a fourth aspect of the present invention, there is provided the pressurized levitation separator according to the third aspect, 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 separator according to claim 5 is the pressure floating separator according to any one of claims 2 to 4, wherein the addition means of the polymer agglomeration aid is a supply port for discharging the polymer agglomeration aid upward. The mouth is provided in the vicinity of the discharge port and higher than the discharge port.

  The pressure levitation separator according to claim 6 is characterized in that, in claim 5, the level difference between the upper end of the supply port and the upper end of the discharge port is within 150 mm.

  A pressurized flotation separation apparatus according to a seventh aspect is the pressure flotation separation apparatus according to any one of the first to sixth aspects, 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 A separation chamber is disposed 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 is disposed below the partition wall. The outlet for allowing the agglomerated reaction water to flow out from the agglomeration reaction chamber along the bottom surface of the mixing chamber is provided, and the pressurized water discharge port is arranged in the extending direction of the outflow direction from the outlet. It is characterized by that.

  The pressurized floating separator according to claim 8 is characterized in that, in claim 7, the supply port of the polymer agglomeration aid is installed closer to the outlet than the pressurized water discharge port. .

  In the pressurized flotation device of the present invention (Claim 1), the aggregates, bubbles and polymer coagulant aid in the coagulation reaction water are sufficiently mixed simultaneously in the mixing chamber by the flow of pressurized water. Therefore, a bubble-containing floc containing many bubbles inside is efficiently formed.

  Aggregates in the agglomeration reaction water from the agglutination reaction chamber have a weak positive charge as a whole because the negative charge due to SS and the positive charge due to the flocculant-derived substance cancel each other. An anionic polymer often used as a polymer agglomeration aid has a negative charge, thereby having a role of coarsening aggregates having a weak positive charge. Fine bubbles also have a high negative charge and adhere to aggregates with a weak positive charge.

  When the agglomerates and the polymer agglomeration aid are first well contacted and stirred to sufficiently flocculate the flocs and then the bubbles come into contact, the bubbles do not adhere well to the flocs and the processing performance is poor. In addition, when the aggregate and the bubble are in good contact with each other and agitated and the bubble adheres to the aggregate and then the polymer agglomeration aid comes into contact, there is no coarse floc, and there is a bubble inside the floc. However, since the bubbles simply adhere to the periphery of the aggregate, the bubbles are easily detached from the aggregate and the processing performance is deteriorated.

  In the pressurized flotation separation apparatus of the present invention, the formation of coarse bubble-containing flocs containing bubbles inside is promoted by simultaneously mixing and contacting the agglomerates, polymer aggregation aid and bubbles. , Floating separation performance is improved.

  In the pressurized flotation separation apparatus according to claim 2, 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.

  During the circulation, the agglomerated reaction water flowing into the mixing chamber through the outlet is mixed with the polymer agglomeration aid and the pressurized water discharged from the pressurized water discharge port at the bottom of the mixing chamber. The mixed water rises along the partition wall and then circulates in the mixing chamber so as to descend mainly along the wall surface of the mixing chamber on the opposite side of the partition wall. At the same time as the bubbles are attached, the aggregates in the aggregation reaction water are grown by the polymer aggregation aid, thereby forming large flocs containing bubbles inside. This bubble-containing floc flows into the floating separation chamber through the upper side of the partition wall, and is efficiently levitated and separated.

  In the pressurized flotation separation apparatus according to the second aspect, the pressurized water discharged upward from the discharge port is added to the agglomerated reaction water flowing toward the pressurized water discharge port. Since the discharge direction of the pressurized water is an upward direction and the pressurized water has a low specific gravity and contains a large amount of bubbles, the mixed water of the agglomerated reaction water and the pressurized water flows smoothly upward along the partition walls.

  The upward flow that has risen above the upper area of the discharge port changes the flow direction in the direction away from the partition at the upper part of the mixing chamber. 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 in the partition wall width direction during the circulation or merges with the inflowing agglomerated reaction water. The pressurized water and the treated water are sufficiently mixed in the entire area. As a result, the bubble-containing floc is sufficiently grown throughout the mixing chamber.

  When the upper part of the partition wall is inclined toward the mixing chamber as in claim 3, the flow direction of the water rising along the partition wall is changed so as to leave 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 above the inclined partition wall as in claim 4, the upward flow caused by the pressurized water discharged from the discharge port hits the inclined portion of the partition wall upper portion 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 pressurized levitation separator of claims 5 and 6, the upward flow above the discharge port allows the polymer coagulation aid to be sufficiently mixed with the water in the mixing chamber containing the pressurized water from the discharge port.

  In the pressurized flotation separation apparatus according to claim 7, the agglomerated reaction water in the agglomeration reaction chamber flows into the mixing chamber through the outlet at the bottom of the partition wall, and the pressurized water discharge port along the bottom surface of the mixing chamber It flows toward. 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.

  In the pressurized flotation separation apparatus according to the eighth aspect, the polymer flocculating aid solution is drawn into the force of a large flow of pressurized water and flows upward while being mixed with the pressurized water. As a result, the floc growth and levitation separation efficiency are stably improved without causing the polymer aggregation aid solution having a large specific gravity and a large viscosity to sink and accumulate.

  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, 30 are arranged in the longitudinal direction of the tank body 3, and the partition walls 1, 2 are extended in the short direction, that is, the width direction of the tank body 3.

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

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

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

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

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

  Aggregation reaction water flows into the mixing chamber 20 through the outlet 16, and flows along the tank bottom surface 3b in the vicinity of the center in the width direction of the mixing chamber 20. In the tank bottom surface 3b, a nozzle 23 for discharging pressurized water is provided in the center in the width direction and relatively close to the partition wall 2. The upper end of the nozzle 23 is a pressurized water discharge port. The tip of the nozzle 23 slightly protrudes from the tank body bottom surface 3b.

  In the vicinity of the nozzle 23 and on the outlet 16 side of the nozzle 23, a supply tube 27 for the polymer coagulation aid solution is provided. The supply pipe 27 is installed upward so as to discharge the polymer aggregation aid solution upward. The upper end of the supply pipe 27 is a supply port for the polymer coagulation aid solution.

  As the polymer aggregation aid, it is desirable to use anionic polymers such as sodium polyacrylate, partially hydrolyzed salt of polyacrylamide, sodium alginate, CMC sodium salt and the like.

  The level of the upper end of the supply pipe 27 is higher than the upper end of the nozzle 23.

  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.

  In this embodiment, the nozzle 23 and the supply pipe 27 are arranged in a vertically lower region of an inclined partition upper portion 2b described later. In this embodiment, only one nozzle 23 and supply pipe 27 are provided at the center of the tank bottom surface 3b in the width direction.

  The polymer coagulation assistant solution from the supply pipe 27 is added to the coagulation treated water from the outlet 16, and pressurized water from the nozzle 23 is added thereto, and these are mixed and mainly near the center in the width direction of the partition wall 2. Ascend along. 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 outlet 16. In this way, a vertical circulation flow is formed in the mixing chamber 2 as shown in FIG. And while circulating, fine bubbles generated from the pressurized water adhere to the aggregates, and at the same time, the aggregates in the aggregation reaction water are coarsened by the polymer aggregation assistant, so that large bubbles containing bubbles are contained inside. Become a flock.

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

  Aggregation reaction water flows into the mixing chamber 20 from the outlet 16, and the inflowed water flows toward the partition wall 2 near the center of the tank body width direction along the tank bottom face 3 b.

  The polymer aggregation aid solution is added from the supply pipe 27 and the pressurized water is added upward from the nozzle 23 to the flow along the tank bottom surface 3b. The polymer agglomeration aid is drawn into a large momentum of the pressurized water and flows upward while being mixed with the pressurized water. Since the nozzle 23 is disposed relatively close to the partition wall 2, the flow that attempts to change the flow upwards against the partition wall 2 and the upward pressurized water flow overlap each other, thereby the vicinity of the partition wall 2. In the vicinity of the central part of the tank body in the width direction, an upward flow with 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 on both sides in the width direction, the flow toward the partition wall 1 flows from the vicinity of the center in the width direction near the partition wall 2 to the entire width direction of the partition wall 1 as shown in FIG. It becomes a spreading radial flow. The flow spreading over the entire partition wall 1 then descends along the partition wall 1 and moves toward the partition wall 2 so as to converge in the vicinity of the center in the width direction of the tank bottom surface 3b with the flow from the outlet 16. Flowing. 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.

  As described above, 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 being separated from the partition wall 2, After descending along the partition wall 1, the 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, the polymer flocculating aid solution, and the pressurized water are mixed evenly.

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

  As a result, the floc is supplied to the levitation separation chamber 30 in a state where the flocculated water and the polymer flocculation aid solution are sufficiently mixed with the pressurized water and the flocc contains sufficient bubbles, and the floc is efficiently levitated and separated. Is done.

  Moreover, in this embodiment, the polymer coagulation assistant solution is added from the supply pipe 27 to the coagulation reaction water from the outlet 16, and then pressurized water is added from the nozzle 23. For this reason, bubbles adhere to the aggregate in the aggregation reaction water, and at the same time, the polymer aggregation aid comes into contact with the aggregate, and the polymer aggregation assistant easily binds to the aggregate surface. As a result, small agglomerates in the agglomeration reaction water are bound to each other by the polymer agglomeration aid, and are easily grown. Since the grown coarse floc contains bubbles inside the floc, the rising speed is high and the bubbles are difficult to separate from the floc. For this reason, the levitating separation process is efficiently performed.

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

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

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

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

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

  The volume of the mixing chamber 20 is preferably about 2 to 30% of the volume of the floating chamber 24 (the mixing chamber 20 and the floating separation chamber 30 are combined to form a floating chamber). The average residence time in the mixing chamber 20 is preferably 10 to 60 seconds, particularly preferably about 15 to 45 seconds.

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

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

  The horizontal distance between the uppermost end of the partition wall 2 (the upper end of the partition wall upper part 2b) and the partition wall 1 is preferably 20 to 200 mm or about 2 to 10% of the longitudinal length of the floating chamber 24.

  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 h of the nozzle 23 from the bottom 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.

  The level difference between the discharge port at the upper end of the nozzle 23 and the supply port at the upper end of the supply pipe 27 is preferably 150 mm or less, particularly preferably about 20 to 100 mm.

  The horizontal distance between the nozzle 23 and the supply pipe 27 is preferably 100 mm or less, particularly 50 mm or less, and the mixing efficiency of the polymer coagulant aid is improved when the distance between the nozzle 23 and the supply pipe 27 is as short as possible.

  The ratio h / H between the protruding length H of the supply pipe 27 from the bottom of the mixing chamber and the protruding length h of the nozzle 23 is preferably about 0.1 to 0.4.

  In the above embodiment, the outflow port 16 is formed of a rectangular opening, but may be a semicircular or semi-elliptical shape, a circular or horizontally long elliptical shape, or a polygonal shape.

  In this embodiment, since the bottom surface of the agglomeration reaction chamber 10 and the bottom surface of the mixing chamber 20 are flush with each other, the agglomerated water from the agglomeration reaction chamber 10 flows along the tank bottom surface 3b without disturbing the flow. It passes through the outlet 16 and flows in the center in the width direction along the bottom surface of the mixing chamber 20. In order to prevent this flow from spreading laterally or upward, a relatively short tunnel-shaped guide member may be connected to the outlet 16.

  In the above embodiment, one outlet 16, one supply pipe 27 and one nozzle 23 are provided, but two may be provided as shown in FIGS. 6 and 7, and three or more may be provided. Also good. FIGS. 7 (a) and 7 (b) show the flow of water when two of these are provided. 7 (a) is a horizontal sectional view of the same portion as FIG. 5, and FIG. 7 (b) is a sectional view taken along the line BB of FIG. 7 (a).

  6 and 7, the agglomeration reaction water flowing out from the outlets 16 flows toward the nozzles 23 located in front of the respective outlets 16, and the polymer agglomeration aid solution is added from the supply pipe 27 along the way. . The flow of water that has reached the vicinity of each nozzle 23 flows upward along the partition wall 2 by the upward pressurized water flow from each nozzle 23, and then circulates. In this case, the upward flow is formed near the upper portion of each nozzle 23. Further, the downward flow is formed in a region along both side surfaces 3 a and 3 a of the tank body 3 and a region between the nozzles 23 and 23.

  For this reason, even when the width of the tank body 3 is large, a circulation flow is uniformly formed throughout the mixing chamber 20, and the growth of flocs and the adhesion of bubbles proceed sufficiently.

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. It is the IV-IV sectional view taken on the line of FIG. It is the VV 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 explanatory drawing of the circulating flow in embodiment of FIG. It is sectional drawing which shows a prior art example. It is a perspective view which shows the waste_water | drain introduction pipe and pressurized water pipe 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 Agglomeration reaction chamber 15 Stirrer 16 Outlet 20 Mixing chamber 22 Pressurized water production apparatus 23 Nozzle 27 Supply pipe | tube 30 of polymer coagulant assistant solution 30 Floating separation chamber 31 Scraper

Claims (8)

A pressurization flotation separation device that performs a flotation separation process in a flotation separation chamber after mixing agglomeration reaction water and pressurized water in a mixing chamber,
By dividing the tank body by a partition wall, a mixing chamber and a 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, whereby water flows out from the mixing chamber to the floating separation chamber through the upper side of the partition wall. In the pressurized flotation separation device,
A pressurized water discharge port for discharging pressurized water in which gas is dissolved in the mixing chamber;
An apparatus for adding pressure to the polymer flotation aid is provided in the mixing chamber. In Claim 1, the pressurized water discharge port is provided so as to discharge pressurized water upward in the vicinity of the partition wall in the bottom of the mixing chamber.
A pressurized flotation separation apparatus characterized in that an outlet for allowing the agglomerated reaction water to flow out is provided at the lower part of the mixing chamber toward the pressurized water discharge port. In Claim 1 or 2, 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.   4. The pressurized levitation separator according to claim 3, wherein the pressurized water discharge port is disposed in a vertically lower region of the upper portion of the inclined partition wall.   In any one of Claims 2 thru | or 4, the addition means of the said polymer aggregation aid is a supply port which discharges a polymer aggregation aid upwards, and this supply port is the vicinity of the said discharge port, and A pressurized flotation separation device provided above the discharge port.   6. The pressurized floating separator according to claim 5, wherein a level difference between the upper end of the supply port and the upper end of the discharge port is within 150 mm. In any one of Claims 1 thru | or 6, 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 outlet for allowing the agglomerated reaction water to flow out from the agglomeration reaction chamber along the bottom surface of the mixing chamber is provided at the lower part of the partition wall, and the outlet is extended in the direction of the outflow from the outlet. A pressurized flotation separation apparatus, wherein a pressurized water discharge port is disposed.   8. The pressurized levitation separator according to claim 7, wherein the supply port for the polymer agglomeration aid is installed closer to the outlet than the pressurized water discharge port.

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