JP4711075B2 - Aggregation reactor - Google Patents

Description

  The present invention relates to an agglomeration reaction apparatus, and more particularly to an agglomeration reaction apparatus that generates and treats an agglomerated sludge by an agglomeration reaction when separating a pollutant from water containing a contaminant such as a suspended substance (SS) or oil.

Conventionally, in water treatment and wastewater treatment, an inorganic or organic flocculant is injected into the agglomeration reactor together with the raw water (treated water) to be treated, and suspended or dissolved substances contained in the treated water are removed. Aggregation and removal as agglomerated flocs are performed.
As this type of apparatus, a vertical wet granulation apparatus is known (see, for example, Patent Document 1). This is because the suspension containing the suspended substance is introduced into the inside of the inflow pipe provided below the agglomeration reaction tank, and the polymer flocculant is introduced from below the agglomeration reaction tank to the agglomeration reaction tank to generate a swirl flow. The agglomeration reaction is caused to occur, and is discharged from the outflow pipe provided above the agglomeration reaction tank.

An aggregating apparatus that causes a similar agglutination reaction is also known (see, for example, Patent Document 2). In this aggregating apparatus, a plurality of partition walls having openings are provided in the agglomeration reaction tank in a plurality of stages, and a rotating disk is provided between the multi-stage partitions so as to cause a contact rolling motion on the generated floc inside the tank. It arrange | positions as desired and it comprised so that raw | natural water might be guide | induced from the opening part provided above the coagulation reaction tank.
Japanese Utility Model Publication No. 60-24411 Japanese Patent Laid-Open No. 49-9964

However, when the raw water is allowed to flow from below the agglomeration reaction tank as in the vertical wet granulation apparatus described in Patent Document 1, the raw water is fed into the mixing chamber of the pressurized flotation tank provided at the next stage of the agglomeration reaction apparatus. There is a problem that cannot be supplied directly. In addition, this apparatus has a problem that it is difficult to visually check the state of the raw water because the raw water is guided from below to the coagulation reaction tank.
Although this type of problem can be solved by using the aggregating apparatus described in Patent Document 2, the raw water introduced into the tank from above the agglomeration reaction tank has a downward momentum. As a result, a new problem arises in that the processing performance deteriorates due to inflow (short circuit) to the second stage before sufficient agglomeration processing cannot be performed in the first stage constituted by multiple stages.

  The present invention has been made to solve such a conventional situation, and the object of the present invention is to reduce the short circuit of raw water in the agglomeration reaction tank and to reduce the amount of unagglomerated suspended matter (SS). Is to provide good treated water to the solid-liquid separation device located in the subsequent stage of the agglomeration reaction device.

In order to achieve the above-mentioned object, the agglomeration reaction apparatus of the present invention receives a water to be treated guided by a predetermined pipe from above, and discharges the water to be treated treated from below, and this water tank. And a plurality of partition plates that divide the interior into three or more reaction chambers in the vertical direction, and a plurality of stirring means for respectively stirring the water to be treated guided to the reaction chamber . An agglomeration reaction apparatus, in particular, the pipe includes a discharge port for discharging the water to be treated in a horizontal direction in the water tank,
The stirring means extends vertically from a substantially central position of a horizontal plane in the water tank, penetrates the partition plate, and passes through each reaction chamber, and is attached to the rod body, and its longitudinal direction A drive unit for rotating the rod body with the axis as a center, and attached to the rod body, and extending from the axis of the rod body toward the wall surface of the water tank for each reaction chamber through which the rod body passes. The plurality of partition plates are provided with slits that pass through substantially the center of the partition plates and communicate with adjacent reaction chambers, and the slits are located above the plurality of partition plates. Or it is provided in the extending | stretching direction which does not mutually overlap when it sees from the downward direction, It is characterized by the above-mentioned.

Preferably, the partition plate includes a slit that passes through a substantial center of the partition plate and communicates the plurality of reaction chambers .
In particular, the discharge port is configured such that the height of the center position in the opening is substantially equal to the height of the water surface of the treated water stored in the water tank.
Preferably, the surface of the water to be treated guided into the water tank by the pipe is positioned at the height of the opening at the discharge port of the pipe.

  The above-described flocculation reaction apparatus guides raw water (treated water) to a reaction tank positioned above the tank, and obtains flocculated water from the reaction tank positioned below. The raw water is guided from above the coagulation tank by a pipe (raw water introduction pipe) for guiding the raw water to the reaction tank, and then discharged from a discharge port whose direction is changed in the horizontal direction in the coagulation tank. The height of the central position of this discharge port is positioned at substantially the same level as the water level of the treated water stored in the coagulation tank, and the lower reaction chamber is in a state where the treatment water is not sufficiently coagulated in the upper reaction chamber. This prevents a so-called short circuit that flows directly into

Further the stirring means, anti応室you located upstream of the reaction chamber to fit Ri neighbor, as characterized by comprising the stirring blade of equal or greater number against anti応室located downstream thereof Yes.

Preferably, the stirring means is attached to the rod body so that the four stirring blades form a phase difference of approximately 90 degrees with respect to the rotation direction of the rod body in the most upstream reaction chamber . desirable.
More preferably, in the plurality of reaction chambers other than the reaction chamber on the most upstream side , the stirring means has two phases of the stirring blades having a phase difference that is approximately 180 degrees different from the rotation direction of the rod body. The two stirring blades attached to the rod body and provided in the reaction chamber adjacent to the downstream side and the two stirring blades provided in the reaction chamber adjacent to the upstream side have a stretching direction of 90 degrees relative to each other. It is desirable to attach to the rod body with a phase difference of.

  The agglomeration reaction apparatus described above has a larger number of blades than the agitation blades provided in the reaction chamber close to the discharge port through which the raw water is introduced into the vessel, that is, the reaction vessel located in the upper reaction vessel, The turbulent flow intensity generated in the water to be treated stirred by the stirring blade is large. On the other hand, in the reaction tank located at the lower side, a stirring blade having a smaller number of blades than the upper reaction tank is provided, so that the turbulent strength of the water to be treated generated by the stirring is weakened and the stirring is performed slowly. It works in the same way. For this reason, after carrying out rapid stirring to to-be-processed water, it acts similarly to having performed slow stirring, and a favorable aggregated floc with a large particle size is produced | generated.

More preferably, the width of the slit in the short direction is substantially wider than the thickness of the stirring blade and is 20% or less of the length of one side of the partition plate.
The agglomeration reaction apparatus described above has a lower reaction chamber in a state where the water to be treated in the lower reaction chamber flows backward into the upper reaction chamber, so-called reverse mixing, or the water to be treated in the upper reaction chamber is insufficiently coagulated. The so-called short circuit that flows into the substrate hardly occurs and the reaction rate becomes high. For this reason, the amount of unaggregated suspended matter (SS) etc. in the to-be-treated water is reduced in the agglomeration reaction apparatus of the present invention, and the quality of the treated water is improved.

  According to the agglomeration reaction apparatus of the present invention, the height of the central position of the discharge port provided at the end of the pipe (raw water introduction pipe) for guiding the raw water (treated water) into the agglomeration tank is stored in the agglomeration tank. Since it is positioned at substantially the same height as the water surface of the treated water, it is possible to improve the coagulation treatment rate of the raw water that is less likely to cause a short circuit in the coagulation reaction tank partitioned by a plurality of reaction chambers. Since this discharge port is positioned above the agglomeration reaction tank, it is possible to visually check the state of the raw water (treated water) flowing into the agglomeration reaction tank, and the raw water can be easily sampled. .

  In the agglomeration reaction apparatus of the present invention, a slit is provided in a partition plate that partitions a plurality of reaction chambers, and is made to coincide with the extending direction of the stirring blades provided in the reaction chamber directly under the partition plate. Therefore, the stirring blade can be pulled upward through this slit. Therefore, since the stirring blade can be pulled upward without removing the partition plate, maintenance such as removal and attachment of the stirring blade can be easily performed.

  Furthermore, in the agglomeration reaction apparatus of the present invention, in the plurality of reaction chambers partitioned by the partition plate, the number of the agitation blades provided in the reaction chamber located above the agglomeration reaction tank is reduced. Since the number is larger than the number, the turbulence intensity generated in the water to be treated in the reaction chamber located above is increased. For this reason, after performing rapid stirring to to-be-processed water, it acts similarly to having performed slow stirring, and can produce | generate a favorable aggregate floc with a large particle size. On the other hand, since the number of stirring blades is smaller in the reaction chamber located below than the upper reaction chamber, the turbulent flow strength of the water to be treated generated by stirring is weakened. Therefore, the same effect as the slow stirring can be obtained.

  As described above, the flocculation reaction apparatus of the present invention reduces the amount of unaggregated suspended matter (SS) and the like in the water to be treated, so that the quality of the treated water led to the subsequent solid-liquid separation apparatus is improved. There is a great effect.

Hereinafter, an embodiment of an agglutination reaction apparatus of the present invention will be described with reference to the accompanying drawings.
1 to 4 are examples of embodiments for carrying out the invention. However, these drawings are for explaining the present invention, and the present invention is not limited by these drawings.
1-4, 10 is an aggregation reaction tank (water tank). The agglomeration reaction tank 10 is provided with a pipe (raw water introduction pipe) 1 for introducing raw water (treated water) into the agglomeration reaction tank 10 from above. Under the agglomeration reaction tank 10, there is provided a discharge path 2 through which water to be treated that has been treated in the agglomeration reaction tank 10 is taken out and discharged to the pressurized flotation device 32 at the next stage.

  The raw water introduction pipe 1 is bent downward from above the agglomeration reaction tank 10 and is bent in the horizontal direction in the agglomeration reaction tank 10 (refer to FIG. 3 and FIG. 4 (a) FF ′ cross section). . And the discharge port 1a which discharges raw | natural water (to-be-processed water) in the aggregation reaction tank 10 is provided in the edge part. The opening of the discharge port 1a is led into the agglomeration reaction tank 10 and is positioned in the agglomeration reaction tank 10 at a height substantially equal to the position of the water surface of the water to be treated stored during the agglomeration process. It is desirable that the height of the open portion at the center is substantially equal to the position of the water surface of the water to be treated (the position of the FF ′ cross section in FIG. 4B).

  The agglomeration reaction tank 10 includes a partition plate 12 that is positioned inside the agglomeration reaction tank 10 and partitions the inside of the agglomeration reaction tank 10 into a plurality of reaction chambers 11 in the vertical direction. The partition plate 12 is provided with a slit 12a that passes through substantially the center of the partition plate 12 and is cut out to a predetermined width. The slit 12a communicates the plurality of reaction chambers 11 partitioned by the partition plate 12 and guides raw water (treated water) guided to the aggregation reaction tank 10 from the upper reaction chamber 11 to the lower reaction chamber 11. It plays the role which prevents the short circuit or reverse mixing which arises in each reaction chamber 11. The slit 12a is 20% or less, preferably 15% or less of the width or depth of the agglomeration reaction tank 10, and is desirably 1 mm or more wider than the width of a stirring blade 13b described later.

The agglomeration reaction tank 10 has a more complicated structure although the quality of treated water is improved as the number of partition plates 12 is increased and a multi-stage configuration having a large number of reaction chambers 11 is provided. Therefore, the agglomeration reaction tank 10 is preferably composed of three reaction chambers 11 using two partition plates 12 because the structure is not complicated.
The plurality of reaction chambers 11 partitioned by the partition plate 12 are respectively provided with a plurality of stirring means 13 for stirring the water to be treated guided to each reaction chamber 11. This stirring means 13 is a rod that extends vertically from the substantially central position of the water surface formed by the water to be treated that is guided and stored in the agglomeration reaction tank 10, penetrates the partition plate 12, and penetrates each reaction chamber 11. A body 13a, a drive unit 14 that is attached to the rod body 13a and rotationally drives the rod body 13a with the longitudinal direction as an axis, and a reaction that is attached to the rod body 13a and penetrates the rod body 13a. Each chamber 11 is provided with a plate-like stirring blade 13b extending from the axial center of the rod 13a toward the wall surface of the agglomeration reaction tank 10.

  For example, if the agglomeration reaction tank 10 has a height of 950 mm and a width and a depth of 800 mm, the width of the stirring blade 13b is about 31 mm to 200 mm, preferably 50 mm to 80 mm. Alternatively, the width of the stirring blade 13b is about 3% to 40%, preferably 8% to 31% with respect to the height of each reaction chamber 11. The thickness of the stirring blade 13b is about 3 mm to 10 mm, preferably 4.5 mm to 7 mm.

  Further, the reaction chamber 11 located on the upstream side of the adjacent reaction chambers 11 is provided with at least an equal number of stirring blades 13b than the downstream reaction chambers 11. Preferably, the number of the stirring blades 13b is increased in the reaction chamber 11 located on the upstream side. For example, as shown in FIG. 2, when the agglomeration reaction tank 10 includes three reaction chambers 11 with two partition plates 12, the most upstream (first stage) reaction chamber 11 includes four stirring blades. The stirring means 13 is provided with 13b, and the next-stage (second stage) and final-stage reaction chambers 11 each have two stirring blades 13b.

In this way, by increasing the number of the stirring blades 13b of the reaction chamber 11 located on the upstream side, the turbulent strength given to the water to be treated is increased toward the upstream side, while the turbulent strength given to the water to be treated on the downstream side is weakened. To do.
In addition, when the first-stage reaction chamber 11 includes four stirring blades 13b, it is desirable that the reaction chambers 11 be attached with a phase difference of approximately 90 degrees with respect to the rotation direction of the rod 13a.

Moreover, when the stirring means 13 located in the downstream reaction chamber is provided with two stirring blades 13b, it is preferable to attach the stirring means 13 with a phase difference of approximately 180 degrees with respect to the rotation direction of the rod body 13a.
In particular, as shown in FIG. 2, the stirring means 13 provided in each of the second-stage and final-stage reaction chambers 11 includes two stirring blades 13b provided in each reaction chamber 11, respectively, with respect to the rotation direction of the rod 13a. When attached to the rod body 13a with a phase difference of about 180 degrees different from each other, the extension direction of the stirring blades 13b respectively provided in the adjacent reaction chambers 11 forms a phase difference of 90 degrees with the rod body 13a. Install.

  Therefore, the stirring blades 13b provided in the reaction chambers 11 located downstream of the second stage and the subsequent stages are provided with positions of the slits 12a of the reaction chambers 11 in order to facilitate maintenance such as removal and attachment of the stirring blades. Are provided so as to coincide with the extending direction of the stirring blades 13b provided in the adjacent reaction chambers 11 respectively. Specifically, as shown in FIG. 3, it is assumed that the stirring blades 13b provided in the reaction chambers 11 of the second stage and the final stage are attached to the rod body 13a so as to form a phase difference of 90 degrees. 3 (see the CC ′ cross section of FIG. 3 and FIG. 4C and the cross section of FIG. 4G EE ′), the slits 12a provided in each partition plate 12 also aggregate so as to have a phase difference of 90 degrees from each other. It is installed in the reaction vessel 10 (see the BB ′ cross section and FIG. 4 (g) DD ′ cross section in FIGS. 3 and 4D).

In addition, the mounting position of the raw water introduction pipe 1 and the discharge port 1a described above is such that the stirring blade 13b rotates clockwise in this figure as shown in the cross-section FF ′ in FIG. When the swirling flow is generated, the raw water is discharged into the agglomeration reaction tank 10 from the discharge port 1a so as to coincide with the tangential direction of the swirling flow by the stirring blade 13b.
In addition, although the aggregation reaction tank 10 mentioned above was demonstrated as a rectangular parallelepiped shape, the cross section of a horizontal surface may be cylindrical shapes, such as circular or elliptical shape (not shown in particular). In that case, the partition plate 12 described above is matched with the cross-sectional shape of the agglomeration reaction tank 10 so that a plurality of reaction chambers 11 are formed, and the partition plate 12 may be provided with slits 12a. Of course, in this case, it goes without saying that the stirring blade 13b can be rotated without contacting the wall surface of the agglomeration reaction tank 10 when rotating.

  Incidentally, on the downstream side of the discharge port 1a, that is, on the downstream side of the swirling flow, although not described in detail, a flocculant inlet 20 for introducing a flocculant that causes agglomeration reaction to the raw water introduced into the agglomeration reaction tank 10, A pH sensor 21 that measures the pH of the water to be treated in the reaction tank 10 that undergoes agglutination reaction, a pH measurement device 22 that measures the pH value detected by the pH sensor 21, and a pH value detected by the pH measurement device 22 are An alkaline agent inlet 23 and an acidic agent inlet 24 are provided for introducing an alkaline agent and an acidic agent into the agglomeration reaction tank 10 so as to obtain an appropriate pH value. The flocculant charged from the flocculant charging port 20 is held in a PAC tank 25 that stores the flocculant, and the flocculant pump 27 is driven from the control unit 26 of the flocculant control device to be injected into the flocculant reaction tank 10. The dosage is controlled. Further, in order to set the pH value in the agglutination reaction tank 10 to a predetermined value, the pH value measured by the pH measuring device 22 is given to the control unit 26 to adjust the pH value in the agglomeration reaction tank 10. And the alkaline agent tank 28 and the hydrochloric acid tank 29 for storing acidic chemical solution (hydrochloric acid), respectively, and the alkaline agent injection pump 30 or hydrochloric acid injection pump 31 is selectively driven from the control unit 26 to inject the chemical solution into the agglomeration reaction tank 10. The pH value is adjusted.

  A pressure levitation device 32 is connected to the next stage of the agglomeration reaction tank 10 of the present invention configured as described above. Although this pressurized levitation device 32 is different from the agglomeration reaction device of the present invention, it will be briefly described, but plays a role of separating flocs contained in the water to be treated that has undergone agglomeration reaction in the agglomeration reaction tank 10. The pressurized levitation device 32 takes out the treated water stored in the tank, mixes air to generate high-pressure pressurized water, and connects the agglomeration reaction tank 10 and the pressurized levitation device 32 to the discharge path 2. A pressurized water production apparatus 33 for feeding the gas-liquid mixed flow is provided.

  A flock (such as scum) smaller than the specific gravity of water contained in the water to be treated that has undergone agglomeration reaction in the preceding agglomeration reactor is a scum positioned in the vicinity of the water surface of the water to be treated stored in the pressurized levitation device 32. It is discharged out of the tank by the take-out device 34 and discharged as floating sludge. On the other hand, sludge having a large specific gravity contained in the water to be treated guided to the pressurized levitation device is discharged out of the tank as sedimentation sludge.

Thus, the treated water from which the sludge has been taken out by the pressurized flotation device 32 is adjusted in the water level by the water level adjustment device 40 in the next stage and sent to the subsequent process.
Thus, according to the flocculation reaction apparatus of the present invention configured as described above, the raw water is received from above through the pipe (raw water introduction pipe 1) for introducing the raw water (treated water) into the flocculation reaction tank 10, The treated water is discharged in the horizontal direction in the agglomeration reaction tank 10 from the discharge port 1a provided at the end of the raw water introduction pipe 1, and a plurality of reaction chambers are provided in the tank by a plurality of partition plates 12 having slits 12a. 11 is provided, the reaction in the flocculation reaction tank 10 becomes a multistage reaction, and the flocculation treatment rate of the raw water can be improved. Further, since the discharge port 1a is positioned above the agglomeration reaction tank 10, the state of raw water (treated water) flowing into the agglomeration reaction tank 10 can be visually observed, and the raw water is easily sampled. It is also possible.

  In the agglomeration reaction tank 10, slits 12 a are respectively provided in partition plates 12 that partition a plurality of reaction chambers 11, and the notch direction of the slits 12 a is within the reaction chamber 11 immediately below that is partitioned by the partition plates 12. Is provided so as to coincide with the extending direction of the agitating blade 13b provided in the above, so that the agitating blade 13b can be pulled upward through the slit 12a. Therefore, since the stirring means 13 can be pulled upward without removing the partition plate 12, maintenance such as removal and attachment of the stirring blade 13b can be easily performed.

Particularly, in the agglomeration reaction apparatus of the present invention, in the plurality of reaction chambers 11 partitioned by the partition plate 12, the number of the stirring blades 13b provided in the agglomeration reaction tank 10 located above the agglomeration reaction tank 10 is positioned below. Since there are more than the number of stirring blades 13b in the reaction chamber 11, the turbulence intensity generated in the water to be treated in the reaction chamber 11 located above is increased.
Further, in the reaction chamber 11 located below, since the number of stirring blades is smaller than that of the upper reaction chamber 11, the turbulent strength of the water to be treated generated by stirring is weakened, and the same effect as that of the slow stirring is obtained. Can do. For this reason, after performing rapid stirring to to-be-processed water, it acts similarly to having performed slow stirring. Therefore, a good aggregate floc having a large particle size can be obtained.

As described above, the agglomeration reaction apparatus of the present invention can reduce the amount of unaggregated suspended matter (SS) and the like in the water to be treated, and improve the quality of the treated water led to the solid-liquid separation apparatus in the subsequent stage. it can.
The agglutination reaction apparatus of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

The figure which shows the principal part schematic structure of the sludge aggregation processing system using the aggregation reaction apparatus which concerns on one Embodiment of this invention. The perspective view which shows schematic structure of the aggregation reaction tank shown in FIG. Sectional drawing which looked at the aggregation reaction tank shown in FIG. 1 from the side. Sectional drawing of the aggregation reaction tank shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw water introduction pipe 1a Discharge port 2 Discharge path 10 Agglomeration reaction tank 11 Reaction chamber 12 Partition plate 12a Slit 13 Stirring means 13a Rod body 13b Stirring blade 14 Drive part 20 Aggregating agent inlet 21 pH sensor 22 pH measuring device 23 Alkaline agent charging Port 24 Acidic agent charging port 25 PAC tank 26 Control unit 27 Coagulation pump 28 Alkaline agent tank 29 Hydrochloric acid tank 30 Alkaline agent injection pump 31 Hydrochloric acid injection pump

Claims (8)

A water tank for receiving the water to be treated guided by a predetermined pipe from above and discharging the water to be treated treated from below,
A plurality of partition plates located in the water tank and partitioning the interior into three or more reaction chambers in the vertical direction;
An agglomeration reaction apparatus comprising stirring means for stirring the water to be treated respectively led to the reaction chamber ,
The pipe includes a discharge port for discharging the water to be treated in a horizontal direction in the water tank,
The stirring means extends vertically from a substantially central position of a horizontal plane in the water tank, penetrates the partition plate, and passes through each reaction chamber, and is attached to the rod body, and its longitudinal direction A drive unit for rotating the rod body with the axis as a center, and attached to the rod body, and extending from the axis of the rod body toward the wall surface of the water tank for each reaction chamber through which the rod body passes. A plate-like stirring blade ,
The plurality of partition plates include slits that pass through substantially the center of the partition plates and communicate with adjacent reaction chambers, and the slits extend in a direction that does not overlap each other when viewed from above or below the plurality of partition plates. An agglomeration reaction apparatus characterized by being provided with .   2. The agglomeration reaction apparatus according to claim 1, wherein a height of a center position of the discharge port is approximately equal to a height of a water surface of the water to be treated stored in the water tank.   2. The agglomeration reaction apparatus according to claim 1, wherein the water surface of the water to be treated guided into the water tank by the pipe is positioned at a height of an opening at a discharge port of the pipe. Reactor.   The reaction chamber located on the upstream side of the adjacent reaction chambers is provided with the same or a larger number of the stirring blades than the reaction chamber located on the downstream side thereof. The agglomeration reaction apparatus described. The stirring means is characterized in that, in the most upstream reaction chamber , the four stirring blades are attached to the rod body with a phase difference of approximately 90 degrees with respect to the rotation direction of the rod body. The agglutination reaction apparatus according to claim 4. In the plurality of reaction chambers other than the reaction chamber on the most upstream side , the stirring means is attached to the rod body so that the two stirring blades have a phase difference of approximately 180 degrees with respect to the rotation direction of the rod body. The two stirring blades provided in the reaction chamber adjacent to the downstream side and the two stirring blades provided in the reaction chamber adjacent to the upstream side have a phase difference of 90 degrees with respect to each other. 6. The agglomeration reaction apparatus according to claim 5, wherein the agglutination reaction apparatus is attached to the rod. The slits, agglutination device as claimed in any one of claims 1 to 6, characterized in that is provided so as to coincide with the extending direction of the stirring blade. The lateral direction of the width of the slit, either one of the preceding claims, wherein the stirring substantially wider than the thickness of the blade, and is 20% or less of the length of the length of one side of the partition plate The agglomeration reaction apparatus described in 1.

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