JP2006095494A - Flocculation/separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flocculation/separation apparatus realizing reduction of an installation area and shortening of a treatment time and realizing stable treatment. <P>SOLUTION: This flocculation/separation apparatus is provided with a flocculation/separation tank 1. Raw water flows-in from a mixing tank 2 to the flocculation/separation tank 1 through a raw water introduction pipe 3, a high specific gravity addition facility 4 and a raw water introduction pipe 5. A flocculant 6 is mixed with the raw water in the mixing tank 2. Further, a coagulant aid 10 is poured into the raw water introduction pipe 5. A water stream generator 11 for stirring water to be treated and generating the water stream and a pair of sludge collection boxes 14 formed by a side wall 1a and a partition plate 13 are provided in the flocculation/separation tank 1 at opposed positions. The partition plate 13 is inwardly inclined toward an upward direction, its lower end is connected to a lower part of the side wall 1a and its upper end is left from the side wall 1a of the flocculation/separation tank 1. The sludge collection box 14 is connected to a separator 8 through sludge transferring pipes 15, 18 and the separator 8 separates a high specific gravity material 9 from the sludge and feeds it to the high specific gravity material addition facility 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flocculating / separating apparatus in the field of water treatment, and more particularly to a flocculating / separating apparatus using a flocculating agent.

  A conventional flocculation / separation apparatus of this type includes a flocculation reaction tank into which treated water (raw water) containing suspended substances and the like flows through a raw water introduction pipe. The water to be treated that has flowed into the agglomeration reaction tank is added with a flocculant from the flocculant supply means, and is supplied with an insoluble additive such as sand from the additive supply means. Further, this aggregating / separating apparatus comprises a mixture extracting means for extracting the mixture from the agglomeration reaction tank, a solid / liquid separation tank for solid-liquid separation of the effluent water from the agglomeration reaction tank, and a separated substance extraction for extracting the separated substance from the solid / liquid separation tank. It is equipped with a pump, return pipe, and additive collector as means. The additive recovery unit separates and recovers the additive contained in the separated product returned from the pump through the return pipe, returns the recovered additive to the agglomeration reaction tank, and discharges the separated sludge to the outside of the system ( For example, see Patent Document 1).

JP 2003-326110 A (page 2, right column, lines 14-26, FIG. 1)

  In the above-described flocculation / separation apparatus, both the flocculating agent and the insoluble additive are added to the flocculation reaction tank. In the mixing tank in which the flocculating agent and the insoluble additive are provided separately from the flocculation reaction tank. There is also a coagulation separation device that is mixed with the water to be treated (raw water). In this type of equipment, the suspended solids in the water to be treated (raw water) are flocked by mixing the flocculant with the water to be treated (raw water) in the mixing tank, and the flocked suspended substances are removed in the agglomeration reaction tank. Aggregates around the insoluble additive to form agglomerated sludge, and in the solid-liquid separation tank, the agglomerated sludge from the agglomeration reaction tank is precipitated by gravity. However, this type of conventional flocculation / separation apparatus has a problem that the treatment time becomes long because water to be treated must be retained in the solid-liquid separation tank for a long time. In addition, since fine suspended solids in the water to be treated (raw water) cannot be completely removed, such fine suspended solids flow out into the treated water, and stable treated water cannot be obtained. There's a problem. Furthermore, since the mixing tank, the agglomeration reaction tank, and the solid-liquid separation tank are installed separately, there is a problem that not only a large site is required, but also the operation management thereof becomes complicated. And when aging progresses and the necessity for an update arises, there exists a problem that there is no room in installation space.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a flocculation / separation apparatus that can reduce installation space and can obtain stable treated water quality with easy operation management. It is.

  A flocculating / separating apparatus according to the present invention includes a flocculating / separating tank into which raw water mixed with a flocculating agent flows, a water flow generator for generating a swirling flow in the flocculating / separating tank, and a mud collection box partitioned by a wall surface and a partition plate. And a sludge transfer pipe for transferring the coagulated sludge.

  Preferably, a high specific gravity material is present in the coagulation separation tank. The sludge transfer pipe is provided with a separator that separates the high specific gravity material and circulates it in the coagulation separation tank. The water flow generator is a stirrer provided with an axial flow type stirring blade.

  In the present invention, by providing the water flow generator and the partition plate in the coagulation separation tank, it is possible to reduce the influence of the density flow that disturbs the flock interface, and the swirling flow and the flock interface can be easily formed throughout. And stable treated water can be obtained. The partition plate can efficiently and stably form a horizontal flow and an inward flow, and the floc and fine floc can be efficiently separated from the water to be treated in a short time.

  Further, by adding a coagulant aid to the liquid mixture (liquid in which raw water and coagulant are mixed), the residence time can be shortened, the installation space can be reduced, and the amount of treated water can be increased. Furthermore, by adding a high specific gravity material to the mixed liquid (liquid in which raw water and flocculant are mixed), the residence time can be further shortened, the installation space can be further reduced, and the amount of treated water can be further increased. That is, by adding a flocculant, a high specific gravity material, and a flocculant aid to raw water, the floc formed by adding the flocculant is converted into a larger floc by the effect of the high specific gravity material and the flocculant aid in a short time and efficiently. Therefore, it is possible to stably obtain high quality treated water.

  In this way, solid-liquid separation can be performed efficiently and stably in a short time by using a partition plate and a high specific gravity material, so that a conventional solid-liquid separation tank that requires a large site is not necessary, and the entire apparatus Will be compact and construction costs will be reduced. Moreover, since there are few machinery to drive, running costs, such as an electricity bill, reduce, and operations, such as maintenance management, are reduced significantly. Furthermore, since solid-liquid separation is performed by utilizing repulsive force due to the difference in specific gravity, it is not necessary to form agglomerated sludge with a large sedimentation speed as in the past, and a conventional solid-liquid separation tank is required, so there is room for installation space. Arise.

  And by providing an advection opening in a partition plate, agglomerated sludge can be reliably advected to a mud collection box. Further, by providing a guide plate on the partition plate, efficient aggregation and solid-liquid separation can be performed. Furthermore, by providing a separator, the high specific gravity material can be separated from the aggregated sludge and reused. And a swirling flow can be efficiently generated by using an axial flow type stirring blade as a water flow generator.

Embodiment 1 FIG.
FIG. 1 is a flowchart showing a flocculation / separation apparatus according to Embodiment 1 for carrying out the present invention. The aggregating / separating apparatus includes an aggregating / separating tank 1. Raw water is allowed to flow from the mixing tank 2 into the coagulation separation tank 1 through the raw water introduction pipe 3, the high specific gravity material addition equipment 4, and the raw water introduction pipe 5. The mixing tank 2 has a raw water inlet 2 a through which raw water flows and a flocculant inlet 2 b for injecting the flocculant 6. The mixing tank 2 maintains a turbulent state with a certain residence time in the raw water, and reacts the suspended substances in the raw water with the flocculant 6 to form a floc. A screen 7 is installed in the high specific gravity material addition equipment 4. Further, the high specific gravity material addition equipment 4 is added with a high specific gravity material 9 that contributes to the coagulation reaction from a separator 8 installed thereabove. The coagulation assistant 10 is injected into the raw water introduction pipe 5 downstream of the high specific gravity material addition facility 4 from the coagulation assistant injection port 10a. By adding the coagulant aid 10, the high specific gravity material 9 and the floc efficiently come into contact with each other by the swirling flow, and a heavy floc is formed, so that solid-liquid separation is improved.

  The mixing tank 2 is designed to mix the raw water and the flocculant 6 quickly and efficiently. However, it is also preferable to provide a stirrer (not shown) for forming a turbulent flow inside the mixing tank 2. The high specific gravity material addition facility 4 is preferably provided with an unillustrated high specific gravity material inlet for loading the high specific gravity material 9. The screen 7 is installed in order to improve the flocculation efficiency in the flocculation / separation tank 1 and prevent the separator 8 from being blocked by removing impurities from the mixed liquid (the liquid in which the raw water and the flocculating agent 6 are mixed). It is. The position of the screen 7 is not limited as long as it is upstream of the agglomeration separation tank 1, but in order to prevent the separator 8 from being blocked, it is preferable to be upstream of the position where the high specific gravity material 9 is added. There is no problem even if it is a front stage of the tank 2. Needless to say, the screen 7 does not need to be installed when the mixed liquid (the liquid in which the raw water and the flocculant 6 are mixed) does not contain impurities.

  The high specific gravity material 9 and the coagulation aid 10 are added at positions where the high specific gravity material 9 and the coagulation aid 10 react instantaneously and promote the formation of flocs. However, the high specific gravity material 9 may be added upstream of the agglomeration separation tank 1, and is preferably added between the agglomeration separation tank 1 and the mixing tank 2. It is preferable to be upstream from the aggregation assistant injection port 10a. The addition position of the coagulation aid 10 may be before the mixed solution flows into the coagulation separation tank 1, or the coagulation aid is introduced immediately after the mixed solution is introduced in the vicinity of the raw water inlet 5a in the coagulation separation tank 1. 10 may be mixed well.

  In the center of the flocculation separation tank 1, a water flow generator 11 is provided that generates a water flow by stirring the mixed liquid (liquid in which raw water and the flocculant 6 are mixed), that is, the water to be treated. A water collector 12 for collecting treated water obtained by solid-liquid separation is provided at the upper part of the coagulation separation tank 1, and the treated water is led out of the system from the water collector 12 through the treated water outlet 12a. It is. A pair of mud collecting boxes 14 partitioned by a pair of partition plates 13 are provided inside the flocculation separation tank 1 so as to face each other. The lower end of the partition plate 13 is connected to the lower part of the side wall (wall surface) 1a, the upper end thereof is separated from the side wall 1a, and the height of the upper end is positioned approximately in the middle of the upper and lower sides of the side wall 1a. In addition, since it is desirable to arrange | position the raw | natural water inlet 5a of the raw | natural water introduction pipe 5 in the area | region where a swirl flow arises, in this Embodiment 1, it is made to be located lower than the upper end of the partition plate 13. FIG.

  Of the pair of mud collection boxes 14, one (right side in the drawing) of the mud collection boxes 14 is connected to the separator 8 via a sludge transfer pipe 15. An opening / closing valve 16 and a transfer pump 17 are arranged sequentially from the box 14 side. The other (left side toward the paper) mud collection box 14 is connected to the sludge transfer pipe 15 via a sludge transfer pipe 18, and the sludge transfer pipe 18 is also opened and closed sequentially from the mud collection box 14 side. A valve 16 and a transfer pump 17 are provided.

  The planar shape of the flocculation separation tank 1 is rectangular, and the entire flocculation separation tank 1 is a rectangular parallelepiped. Further, when comparing the case where the volume is the same and the height is high and the case where the height is low, the latter is not suitable for generating a swirling flow even if the volumes are the same. Therefore, the height of the agglomeration separation tank 1 is preferably larger than the horizontal length (diameter, width). That is, when the planar shape of the flocculation / separation tank 1 is rectangular, the ratio of the height to the horizontal length is preferably 1 or more. However, even when the flocculation / separation tank 1 is long horizontally, a smooth swirling flow can be generated by arranging a partition inside the flocculation / separation tank 1. In the same case, if the diameter of the upper part of the flocculation separation tank 1 is made larger than the diameter of the lower part, the rising speed of the swirling flow in the upper part of the flocculation separation tank 1 can be made slower than the lower part. Can be generated automatically.

  The flocculant 6 is an iron-based and aluminum-based inorganic flocculant having a high cation valence. Examples of this type of inorganic flocculant include polyaluminum chloride, sulfuric acid band, ferric chloride, and ferric sulfate. However, the type of the flocculant 6 is not limited as long as the floc can be formed satisfactorily.

The separator 8 separates the high specific gravity material 9 from the coagulated sludge flowing in from the sludge transfer pipe 15 and circulates and reuses the high specific gravity material 9. In the first embodiment, the separator 8 is a wet liquid cyclone. The separator 8 supplies the high specific gravity material 9 obtained by the separation to the high specific gravity material addition equipment 4 and discharges the remaining sludge out of the system. In this case, if a wear-resistant pump is used for the transfer pump 17, the separator 8 can separate the high specific gravity material 9 from the coagulated sludge in a few seconds. The high specific gravity material 9 can also be supplied directly to the coagulation / separation tank 1. Needless to say, when the high specific gravity material 9 is not reused, the high specific gravity material 9 may be discharged out of the system together with sludge. Needless to say, when the high specific gravity material 9 is not reused, the high specific gravity material 9 may be discharged out of the system together with sludge.

  As the high specific gravity material 9, a substance having a specific gravity of 1 or more, for example, fine sand can be used. The most preferable fine sand is one having a specific gravity of 2.6, a uniformity coefficient of 1.7, and an effective diameter of about 100 μm. As the high specific gravity material 9, an organic or inorganic substance having a specific gravity of 2 to 8 that approximates fine sand, or a mixture of this substance and fine sand can be used. Examples of this type of high specific gravity material 9 include garnet, iron powder, spur ash (manufactured by Tokyo Metropolitan Government), zirconium oxide, anthracite, and the like. In addition, a polymer flocculant, for example, an anionic type or a nonionic type, can be used for the aggregating aid 10.

  The water flow generator 11 is a means for forming a turbulent flow region without destroying the floc by the shearing force accompanying the stirring, and forming a large heavy floc by bringing the high specific gravity material 9 and the like into contact with the micro floc. The water flow generator 11 according to the first embodiment is a stirrer provided with an axial flow type stirring blade 11a, a drive shaft 11b extending vertically upward from the stirring blade 11a, and a motor that rotationally drives the drive shaft 11b. 11c. In addition, although mentioned later, the drive shaft 11b can also be extended in a horizontal direction depending on the installation situation. As the water flow generator 11, not only a stirrer equipped with an axial flow type stirring blade 11a but also a circulator for injecting a water flow, a pump, a fan, an ejector, or the like can be used. The rotation of the water flow generator 11 is preferably variable, but it may not be variable depending on the operating conditions of the coagulation / separation apparatus. In any case, if the swirl flow is satisfactorily formed without destroying suspended substances (particles, flocs) contained in the raw water or the formed sludge, the water flow generator 11 is used in the above apparatus. It is not limited. As the flow of the swirl flow, the water flow from the water flow generator 11 hits the bottom surface of the agglomeration separation tank 1, changes its direction, becomes an upward flow along the partition plate 13, and the water flow in the horizontal direction depends on the inclination angle of the partition plate 13. Change, further towards the center, change with the downward flow.

  In the first embodiment, the water collector 12 introduces treated water that has overflowed from the coagulation separation tank 1 and removes flocs in the treated water. The treated water is transferred out of the system from the treated water outlet 12a. The water collector 12 can include a filter, and the filter can be a rotating disk type. Moreover, the water collector 12 can be a filter provided with a filter medium and a membrane filter provided with a separation membrane or a filter cloth. Furthermore, a trough suitable for the properties of the treated water, for example, a submerged trough can be obtained. These water collectors and troughs will be explained later.

  The partition plate 13 makes the water flow from the water flow generator 11 a swirl flow and concentrates the floc efficiently by solid-liquid separation. Although the angle of the partition plate 13 with respect to the bottom wall 1b of the flocculation / separation tank 1 can be 45 to 90 °, it is preferably 60 ° or more. The mud collecting box 14 is configured to eliminate the influence of the stirring action of the water flow generator 11, that is, to form a portion for stopping the motion of the swirling flow. In the mud collection box 14, the aggregated sludge is concentrated for the purpose of reducing the circulation rate for recycling the high specific gravity material 9 and for the purpose of reducing the amount of sludge excluded from the system in the separator 8. is there. It is reasonable from the standpoint of operation of the apparatus that the sludge concentration in the mud collection box 14 is adjusted to about 7 to 14%. In addition, the partition plate 13 can be extended from the bottom wall 1b of the aggregation separation tank 1, and the front-end | tip of the partition plate 13 can be curved. Thus, the shape of the partition plate 13 is not limited as long as it generates a swirling flow to efficiently settle and concentrate the floc.

  The sludge transfer pipes 15 and 18 are configured to draw the aggregated sludge from the mud collection box 14 by the on-off valve 16 and the transfer pump 17. For these sludge transfer pipes 15 and 18, piping of a sludge treatment system usually used in wastewater treatment, for example, SGP pipe or SUS pipe can be used. In some cases, vinyl chloride pipes can be used for the sludge transfer pipes 15 and 18, but the sludge transfer pipes 15 and 18 for transferring the high specific gravity material 9 are preferably wear-resistant lining pipes.

  Here, the high specific gravity material 9 needs to be added at a constant concentration with respect to the influent water (raw water). The added concentration with respect to the amount of inflow water is preferably 3,000 to 5,000 mg / L. However, the addition concentration can be changed depending on the water quality and properties such as the viscosity of water. The amount of the high specific gravity material 9 added from the separator 8 to the high specific gravity material addition equipment 4 is controlled by the amount of agglomerated sludge drawn by the transfer pump 17. In addition, the amount of flocculated sludge with respect to the amount of raw water flowing into the flocculation separation tank 1 is secured to about 3 to 10%, and the floc concentration in the flocculation separation tank 1 is maintained at about 0.5 to 3%. It is. For this reason, a certain amount of flocculated sludge is extracted from the flocculation separation tank 1 for a predetermined time by using the on-off valve 16 and the transfer pump 17 and transferred to the separator 8 through the sludge transfer pipe 15.

  Next, the operation of the coagulation / separation apparatus in the first embodiment will be described. When the flocculant 6 is mixed into the raw water flowing into the mixing tank 2 from the flocculant inlet 2b, the suspended substances in the raw water react with the flocculant 6 to flock. The mixed liquid thus flocked (the liquid in which the raw water and the flocculant 6 are mixed) flows into the high specific gravity material adding equipment 4 through the raw water introduction pipe 3. At this time, the screen 7 removes impurities in the mixed liquid (liquid in which the raw water and the flocculant 6 are mixed). In the high specific gravity material addition equipment 4, the high specific gravity material 9 from the separator 8 is mixed into the mixed liquid (the liquid in which the raw water and the flocculant 6 are mixed). Then, the mixed liquid containing the high specific gravity material 9 (liquid in which the raw water and the flocculant 6 are mixed) flows through the raw water introduction pipe 5, while the coagulant aid is added to the mixed liquid (the liquid in which the raw water and the flocculant 6 are mixed). 10 mixes from the coagulant aid inlet 10a.

  A mixed solution containing the high specific gravity material 9 and the flocculating aid 10 (a solution in which raw water and the flocculating agent 6 are mixed) flows into the flocculating separation tank 1 from the raw water inlet 5a and becomes treated water. In the flocculation / separation tank 1, the water flow generator 11 operates to generate a swirling flow in the water to be treated. As a result, suspended substances and the like in the water to be treated react with the high specific gravity material 9 and the coagulation aid 10, and flocs are efficiently generated. This floc is integrated with the high specific gravity material 9 to increase the apparent specific gravity. That is, a sludge interface is formed by settling while turning in the flocculation / separation tank 1 faster than the rising speed of the water to be treated. This floc settles in the mud collecting box 14, and the upper treated water overflows into the water collector 12. The mud collection box 14 eliminates the influence of the stirring action of the water flow generator 11, stops the movement of the swirling flow, and concentrates the coagulated sludge. In this way, in the flocculation / separation tank 1, floc formation and solid-liquid separation proceed simultaneously.

  During this time, if the particle (floc) concentration in the flocculation / separation tank 1 increases, the sludge interface rises, so the flocculated sludge is drawn out to the sludge transfer pipes 15 and 18 by the on-off valve 16 and the transfer pump 17. That is, in order to make the concentration of the high specific gravity material 9 relative to the raw water in the flocculation separation tank 1, excess floc is extracted from the flocculation separation tank 1 as flocculated sludge by the on-off valve 16 and the transfer pump 17, Balance the amount of floc. Then, the separator 8 separates the high specific gravity material 9 from the aggregated sludge, and returns the separated high specific gravity material 9 to the high specific gravity material addition equipment 4. Further, the separator 8 not only discharges sludge out of the system and balances the amount of floc in the flocculation separation tank 1, but also prevents the floc from flowing out to the treated water side, and the treated water deteriorates. To prevent.

  As described above, in the flocculation / separation apparatus according to the first embodiment, since the water flow generator 11 and the partition plate 13 are provided in the flocculation / separation tank 1, it is possible to reduce the influence of the density flow that disturbs the interface of the flocs. A flow and a flock interface can be easily formed throughout, and stable treated water can be obtained. Further, the partition plate 13 can efficiently and stably form a horizontal flow and an inward flow, and the floc can be efficiently separated from the water to be treated in a short time. Furthermore, by providing the separator 8, the high specific gravity material 9 can be separated from the aggregated sludge and reused. And since the water flow generator 11 is equipped with the axial flow type stirring blade 11a, a swirl flow can be generated efficiently.

  Further, by adding the coagulation aid 10 to the mixed liquid (the liquid in which the raw water and the coagulant 6 are mixed), the residence time can be shortened, the installation space can be reduced, and the amount of treated water can be increased. Further, by adding the high specific gravity material 9 to the mixed liquid (liquid in which the raw water and the flocculant 6 are mixed), the residence time can be further shortened, the installation space can be further reduced, and the amount of treated water can be further increased. In this way, by adding the flocculant 6, the high specific gravity material 9, and the flocculant aid 10 to the raw water, the floc formed by adding the flocculant 6 is made more effective by the effects of the high specific gravity material 9 and the flocculant aid 10. A large floc can be efficiently separated in a short time, and high-quality treated water can be stably obtained.

  Furthermore, since the solid-liquid separation can be efficiently and stably performed in a short time by the high specific gravity material 9 and the partition plate 13, a solid-liquid separation tank and a sedimentation basin that require a large site are not required, and the apparatus The whole is compact and construction costs are reduced. Moreover, since there are few machinery to drive, running costs, such as an electricity bill, reduce, and operations, such as maintenance management, are reduced significantly. In addition, since solid-liquid separation is performed using repulsive force due to the difference in specific gravity, it is not necessary to form agglomerated sludge with a high sedimentation speed as in the past, and the conventional solid-liquid separation tank and sedimentation basin are not required, and the installation space is reduced. There is room.

Embodiment 2. FIG.
FIG. 2 is a main part flow diagram showing a coagulation / separation apparatus according to Embodiment 2 for carrying out the present invention. The same parts as those in FIG. In the flocculation / separation apparatus according to the second embodiment, a mud collection box 22 is formed by a partition plate 21 longer than the partition plate 13 according to the first embodiment, and the upper end of the partition plate 21 is projected above the water surface. The partition plate 21 is provided with an advection port 23 for aggregating the coagulated sludge to the mud collection box 22. The advection port 23 is preferably a rectangular or circular hole, and is preferably provided at a position corresponding to the upper end of the partition plate 13 in Embodiment 1, that is, near the sludge interface. However, the shape and position of the advection port 23 are not limited as long as the agglomerated sludge is efficiently advected to the mud collection box 22. In the flocculation / separation apparatus in the second embodiment, not only the same effects as in the first embodiment can be obtained, but also the flocculated sludge can be reliably transferred into the mud collection box 22 by the transfer port 23.

Embodiment 3 FIG.
FIG. 3 is a main part flow diagram showing the coagulation / separation apparatus according to Embodiment 3 for carrying out the present invention. The same parts as those in FIG. In the coagulation / separation apparatus according to the third embodiment, a mud collection box 33 is formed by the lower partition plate 31 and the upper partition plate 32. Lower partition plate 31 is arranged in the same manner as partition plate 13 in the first embodiment. The upper partition plate 32 has a lower end positioned slightly below the upper end of the lower partition plate 31 and is shifted inward from the lower partition plate 31 by a predetermined gap to form an advection port 34. . The upper partition plate 32 extends above the lower partition plate 31 in parallel therewith, and the upper end of the upper partition plate 32 protrudes above the water surface. In the flocculation / separation apparatus in the third embodiment, the flocculated sludge is transferred to the mud collection box 33 through the transfer port 34, and the same effect as in the first embodiment can be obtained.

Embodiment 4 FIG.
FIG. 4 is a main part flow diagram showing a coagulation / separation apparatus according to Embodiment 4 for carrying out the present invention. The same parts as those in FIG. In the flocculation / separation apparatus according to the fourth embodiment, the flocculation / separation tank 1 according to the first embodiment is divided into the partition plate 41, the mud collection box 22, and the partition plate 41 similar to the advection port 23, and the mud collection box 42. And an advection port 43 are provided. Further, the porous member 44 is horizontally installed at a position above the sludge interface of the water to be treated, and the guide plate 45 is horizontally fixed to the inner surface of the partition plate 41 inward.

  As shown in FIG. 5, the porous member 44 is a flat plate having a large number of openings 44a. Both ends of the porous member 44 are connected to the partition plate 41 at positions above the sludge interface. Thereby, the sludge interface can be formed more stably than in the second embodiment, and the coagulated sludge can be prevented from flowing upward, and stable and good treated water can be obtained. For this type of porous member 44, a punching metal, a net, a current plate, an inclined plate, an inclined tube, a slit, a honeycomb material, or the like can be used. However, the material of the porous member 44 is not limited as long as the rectifying region can be formed thereabove.

  The guide plate 45 assists (rectifies) the swirling flow, that is, the ascending flow rising along the partition plate 41 is smoothly changed to a horizontal flow (for example, centripetal flow) by the baffle effect, and the floc is separated. It is meant to promote. Since the planar shape of the flocculation / separation tank 1 is rectangular, it is preferable that the flat guide plate 45 is disposed in the vicinity of the porous member 44 in the horizontal direction. However, the shape, length, and position of the guide plate 45 are not limited as long as the guide plate 45 rectifies the swirl flow and promotes the separation of the flocs. In the coagulation / separation apparatus according to the fourth embodiment, not only the same effects as those of the first embodiment can be obtained, but also the coagulation and solid-liquid separation can be performed efficiently by the guide plate 45, and the water to be treated The residence time can be shortened.

Embodiment 5. FIG.
FIG. 6 is a main part flow diagram showing the coagulation / separation apparatus in the fifth embodiment for carrying out the present invention. The same parts as those in FIG. In the fifth embodiment, the partition plate 13 and the mud collection box 14 are provided in the flocculation separation tank 1 as in the first embodiment, and the porous structure is different from the porous member 44 in the fourth embodiment. The member 44A is arranged. As shown in FIG. 7, the porous member 44A is composed of a plurality of elongated plates, that is, rectifying plates 44b. All the rectifying plates 44b are arranged at equal intervals in the horizontal direction in a horizontal plane, and each rectifying plate 44b is inclined at the same angle from the vertical direction in the same direction. In such a porous member 44A, the short ends of each rectifying plate 44b are fixed to the flocculation separation tank 1 at a position covering the sludge interface. In the fifth embodiment, not only the same effects as in the first embodiment can be obtained, but also the separation of flocs can be promoted efficiently, and the residence time of the water to be treated can be shortened.

Embodiment 6 FIG.
FIG. 8 is a main part flow diagram showing the coagulation / separation apparatus in the sixth embodiment for carrying out the present invention. The same parts as those in FIG. Also in the sixth embodiment, the partition plate 13 and the mud collection box 14 are provided in the flocculation separation tank 1 as in the first embodiment, and the mountain-shaped porous member 44B is disposed. The porous member 44B is composed of a plurality of elongated rectifying plates 44c as in the fifth embodiment, but these rectifying plates 44c are arranged symmetrically with respect to the drive shaft 11b of the water flow generator 11. is there. That is, the plurality of rectifying plates 44c are arranged at equal intervals so as to increase sequentially toward the inside, and are inclined at the same angle toward the drive shaft 11b with respect to the vertical direction. In such a porous member 44B, both short ends of each rectifying plate 44c are fixed to the flocculation separation tank 1 so as to cover the sludge interface. In the sixth embodiment, not only the same effects as in the first embodiment can be obtained, but also the floc separation can be promoted efficiently, and the residence time of the water to be treated can be shortened.

Embodiment 7 FIG.
FIG. 9 is a main part flow diagram showing a coagulation / separation apparatus according to Embodiment 7 for carrying out the present invention. The same parts as those in FIG. In the seventh embodiment, as in the first embodiment, the partition plate 13 and the mud collecting box 14 are provided in the flocculation / separation tank 1, and a mountain-shaped porous member 44C having a large number of openings 44a is disposed. It is. That is, the porous member 44 </ b> C is symmetrical with respect to the drive shaft 11 b of the water flow generator 11 and is shaped so as to be highest at the drive shaft 11 b of the water flow generator 11. This porous member 44C has its longitudinal ends connected to the partition plate 13 at a position covering the sludge interface. Even in the seventh embodiment, not only the same effects as in the first embodiment can be obtained, but also the floc separation can be promoted efficiently, and the residence time of the water to be treated can be shortened.

Embodiment 8 FIG.
FIG. 10 is a main part flow diagram showing an aggregating / separating apparatus according to Embodiment 8 for carrying out the present invention. The same parts as those in FIG. In the eighth embodiment, the partition plate 21, the mud collection box 22, and the advection port 23 are provided in the flocculation separation tank 1 as in the second embodiment, and the mountain-shaped rectifying plate 44D is provided in the center. is there. The rectifying plate 44D includes a pair of inclined plates 44d, the upper end of the inclined plate 44d is positioned at the drive shaft 11b of the water flow generator 11, the lower end of the inclined plate 44d is separated from the partition plate 41, and the inclined plate 44d Both ends of the short side are fixed to the aggregation separation tank 1. The coagulation / separation apparatus according to the eighth embodiment can not only achieve the same effects as those of the first embodiment, but also can efficiently promote floc separation, and the rectifying plate 44D can move the sludge upward. Spillage can be regulated.

Embodiment 9 FIG.
FIG. 11 is a main part flow diagram showing a coagulation / separation apparatus according to Embodiment 9 for carrying out the present invention. The same parts as those in FIG. In the ninth embodiment, as in the first embodiment, the partition plate 13 and the mud collection box 14 are provided in the flocculation / separation tank 1, and the mountain-shaped rectifying plate 44E is disposed. The rectifying plate 44E includes a pair of inclined plates 44e, the upper end of the inclined plate 44e is positioned at the drive shaft 11b of the water flow generator 11, and the lower end of the inclined plate 44e is separated from the partition plate 13. The vertical plate 44f extends vertically downward from the lower end of the inclined plate 44e. The short ends of the inclined plate 44e and the vertical plate 44f are fixed to the aggregation separation tank 1. Even in the coagulation / separation apparatus according to the ninth embodiment, not only the same effects as those of the first embodiment can be obtained, but also the floc separation can be efficiently promoted, and the rectifying plate E allows the sludge to move upward. Spillage can be regulated.

Embodiment 10 FIG.
FIG. 12 is a main part flow diagram showing the coagulation / separation apparatus in the tenth embodiment for carrying out the present invention. The same parts as those in FIG. In the flocculation / separation apparatus according to the tenth embodiment, a partition plate 41, a mud collection box 42, an advection port 43, a porous member 44, and a guide plate 45 are provided in the flocculation / separation tank 1 as in the fourth embodiment. In addition, the separator 8 made of a cyclone in the first embodiment is replaced with a separator 8A that separates the coagulated sludge by the specific gravity difference. The separator 8A includes an open-air tank 8a through which the coagulated sludge from the sludge transfer pipe 15 flows from above, and the high specific gravity material 9 that has settled in the tank 8a passes through the high specific gravity material supply pipe 8b. The material is added to the material addition equipment 4. The high specific gravity material supply pipe 8b can be another means capable of transferring the high specific gravity material 9, such as a pump or a belt conveyor.

  In the flocculation / separation apparatus according to the tenth embodiment, the flocculated sludge flows from the mud collection box 42 into the tank 8a of the separator 8A through the sludge transfer pipes 15 and 18, and the tank 8a is relatively heavy among the flocculated sludge. The high specific gravity material 9 settles and separates by the downward flow due to gravity, and relatively light sludge overflows from the upper part of the tank 8a by the upward flow. Then, the high specific gravity material 9 settled and separated in the tank 8a flows to the high specific gravity material addition facility 4 via the high specific gravity material supply pipe 8b. In the separator 8A according to the tenth embodiment, the sedimentation speed of the high specific gravity material 9 is about 70 m / h, the sedimentation speed of the sludge is about 3 to 4 m / h, and the sedimentation speed of the high specific gravity material 9 is the sedimentation speed of the sludge. Therefore, the high specific gravity material 9 can be separated by gravity sedimentation in a short time of about 5 minutes.

Embodiment 11 FIG.
FIG. 13 is a principal part flow diagram showing an aggregating / separating apparatus according to an eleventh embodiment for carrying out the present invention. The same parts as those in FIG. In the eleventh embodiment, a line mixer 2A is provided instead of the mixing tank 2 in the first embodiment. The line mixer 2A is preferably a static mixer having a simple structure that promotes mixing and stirring by generating a vortex inside. As this type of static mixer, for example, Westfall-INKA Static Injection Mixer Model 2800 manufactured by Nippon Inka Co., Ltd. can be mentioned. The same effect as in the first embodiment can be obtained also in the aggregating and separating apparatus in the eleventh embodiment.

Embodiment 12 FIG.
FIG. 14 is a principal part flow diagram showing an aggregating / separating apparatus according to Embodiment 12 for carrying out the present invention. The same parts as those in FIG. In this twelfth embodiment, instead of the water collector 12 in the first embodiment, a water collector 12A provided with a filter is provided inside the flocculation separation tank 1. The filter used for the water collector 12A can be a rotating disk type. The same effect as in the first embodiment can be obtained with the aggregating and separating apparatus in the twelfth embodiment.

Embodiment 13 FIG.
FIG. 15 is a principal part flow diagram showing an aggregating / separating apparatus according to Embodiment 13 for carrying out the present invention. The same parts as those in FIG. In the thirteenth embodiment, instead of the water collector 12 in the first embodiment, a water collector 12A provided with a filter is provided outside the coagulation separation tank 1. The filter used for the water collector 12A can also be a rotating disk type. The same effects as in the first embodiment can be obtained with the aggregating and separating apparatus in the thirteenth embodiment.

Embodiment 14 FIG.
FIG. 16 is a principal part flow diagram showing an aggregating / separating apparatus according to Embodiment 14 for carrying out the present invention. The same parts as those in FIG. In the first embodiment, the pair of partition plates 13 and the pair of mud collection boxes 14 are provided so as to face each other. However, in this embodiment 14, the partition plate 51 and the mud collection box are provided only on one side of the flocculation separation tank 1. 52 and an advection port 53 are provided. That is, the inclined wall 1c extends from the upper and lower middles of one side wall 1a of the coagulation separation tank 1 upward and outward, and the vertical wall 1d extends from the upper end of the inclined wall 1c in the vertical direction. is there. The upper end of the inclined wall 1 c extends to almost half the height reaching the upper end of the flocculation separation tank 1, and the upper end of the vertical wall 1 d is positioned at the same height as the upper end of the other side wall 1 a of the flocculation separation tank 1. Therefore, the water collector 12 is extended to the upper end of the vertical wall 1d. And the part of the side wall 1a which opposes the inclined wall 1c and the vertical wall 1d is made into the partition plate 51, and the advection port 53 is provided in the intermediate | middle of this partition plate 51 up and down. In the aggregating and separating apparatus according to the fourteenth embodiment, the same effects as those of the first embodiment can be obtained, and the installation space in the left-right direction can be reduced on the same.

Embodiment 15 FIG.
FIG. 17 is a principal part flow diagram showing an aggregating / separating apparatus according to Embodiment 15 for carrying out the present invention. The same parts as those in FIG. In this fifteenth embodiment, the configuration is basically the same as that of the fourteenth embodiment, but the height of the partition plate 51A is substantially half that of the partition plate 51 in the fourteenth embodiment, and the advection port 53 in the fourteenth embodiment. Is omitted. The same effect as in the first embodiment can be obtained in the coagulation / separation apparatus in the fifteenth embodiment, and the installation space in the left-right direction can be reduced.

Embodiment 16 FIG.
FIG. 18 is a main part flow diagram showing the coagulation / separation apparatus in Embodiment 16 for carrying out the present invention. The same parts as those in FIG. In the sixteenth embodiment, the partition plate 41, the mud collection box 42, the advection port 43, the porous member 44, and the guide plate 45 are provided in the flocculation separation tank 1 as in the fourth embodiment. 11 is provided in the horizontal direction. That is, the drive shaft 11b of the water flow generator 11 is passed through the side wall 1a and the partition plate 41 of the coagulation separation tank 1, the stirring blade 11a is positioned inside the partition plate 41, and the motor 11c is positioned outside the side wall 1a. is there. In the coagulation / separation apparatus in the sixteenth embodiment, not only the same effects as in the fourth embodiment can be obtained, but also the installation space in the vertical direction can be reduced.

  As mentioned above, in Embodiment 1-16, although the planar shape of the aggregation separation tank 1 was made into the rectangle, it can also be made into a planar polygon. In the case of a plane polygon, it is preferable that the number of corners is even and symmetrical. If the installation conditions and cost are not taken into consideration, the planar shape of the agglomeration separation tank 1 can be circular. Furthermore, in Embodiments 1 to 16, the installation of a single agglomeration separation tank 1 has been described, but a plurality of agglomeration separation tanks 1 can also be installed. For example, by installing a plurality of flocculation / separation tanks 1 in a honeycomb-like manner, it is possible to deal with cases where there are independent reactions or inflow fluctuations.

  Moreover, in Embodiments 1-16, although the classification tank like the separator 8 which consists of a cyclone, or the separator 8A using gravity was used, if the high specific gravity material 9 and sludge can be isolate | separated, Other devices can also be used. For example, it is possible to use a classification tank in which sludge adhering to the high specific gravity material 9 is peeled off from the high specific gravity material 9 and precipitated by stirring, mixing, or dropping.

  Further, in the above-described first to sixteenth embodiments, when a submersible trough is used for the water collector 12, a trough 61 having an opening 61b provided in the upper part of the triangular tube 61a as shown in FIG. 20, a trough 62 having a long opening 62b in the longitudinal direction in the upper part of the circular pipe 62a as shown in FIG. 20, and a large number of small holes 63b in a longitudinal direction in the upper part of the circular pipe 63a as shown in FIG. A trough 63 can be used. Moreover, it can also be set as the structure which combined the several trough 64 of a triangle as shown in FIG. Alternatively, although not submerged, a trough 65 having a slope 65a as shown in FIG. 23 can be used. Further, the water collector 12 has a water collector 12B in which a filter body 66c, a current plate (not shown), etc. are combined with a box body 66b having a vertical surface 66a as shown in FIG. 24, or a slope 67a as shown in FIG. A water collector 12C in which a filter medium 67c is combined with the box 67b having the box body 67b can be used.

  Furthermore, although Embodiment 1-16 demonstrated providing the mud collection boxes 14, 22, 33, 42, 52 in both or one of the side walls 1a which the coagulation separation tank 1 opposes, as shown in FIG. It is also possible to provide four partition plates 71 in the shape of a quadrangular pyramid for the four side walls 1a of the flocculation / separation tank 1. In addition, as shown in FIG. 27, it is also possible to provide partition plates 72 that are inclined inward in the upward direction at the four corners of the coagulation separation tank 1. Furthermore, as shown in FIG. 28, in the case of using a planar circular agglomeration separation tank 1A, a truncated cone-shaped partition plate 73 may be provided therein. And in order to accelerate | stimulate the solid-liquid separation of a floc, as shown in FIG. 29, the haunch 74 can also be provided in the corner part of the aggregation separation tank 1B, or the downward direction of the water flow generator 11. FIG. In addition, as shown in FIG. 30, if the same separation is provided in the flocculation / separation tank 1C as shown in FIG. 29 and the upper part of the side wall 1a of the flocculation / separation tank 1C is inclined outward, the upward speed of the swirling flow is increased from below The sludge interface can be made more efficient by slowing down. As shown in FIG. 31, a sludge in the mud collection box 14 is provided by providing a relatively large inclined wall 75 at the corner of the bottom wall 1b as a hopper type as shown in the flat circular or elliptical aggregation separation tank 1D. It is possible to improve the sedimentation of the water and to make the swirl flow efficiently.

This was carried out using the aggregating and separating apparatus in the first embodiment shown in FIG. As implementation conditions, the raw water is the influent water of the first sedimentation basin of the sewage treatment plant, and the flocculant (inorganic flocculant) 6 is added at a rate of 10 mg / L (in terms of Al ₂ O ₃ ) with respect to the raw water. In the material 9, sand was added so as to have a concentration of 3,000 mg / L with respect to the raw water, and a polymer flocculant was added as a flocculating aid 10 so that the concentration became 1 mg / L with respect to the raw water. The coagulation / separation tank 1 was a square tank having a vertical and horizontal length of 1.45 m and a water depth of 3.2 m (volume is 6.7 m ³ ). And the inclination-angle of the partition plate 13 was 60 degrees, the height of the partition plate 13 was made into the half of the water depth, and the whole partition plate 13 was located in water. Table 1 shows the results of the relationship between the inflow water amount, the apparatus residence time, the raw water SS, the treated water SS, the SS removal rate, the sludge concentration, and the sludge extraction amount based on these conditions. As can be seen from Table 1, the SS removal rate was 80% or more in the apparatus residence time of 30 minutes, and treated water with good water quality could be obtained. The amount of sludge extraction was 10% with respect to the amount of inflow water.

  This was carried out using the aggregating and separating apparatus in the second embodiment shown in FIG. The implementation conditions were the same as in Example 1. Based on these conditions, the implementation results as shown in Table 2 were obtained regarding the relationship among the inflow water amount, apparatus residence time, raw water SS, treated water SS, SS removal rate, sludge concentration, and sludge extraction amount. As can be seen from Table 2, the SS removal rate was 80% or more in the apparatus residence time of 30 minutes, and treated water with good water quality could be obtained. Thus, by providing the advection port 23, the floc concentration efficiency could be improved. The amount of sludge extraction was 8% with respect to the amount of inflow water. Note that substantially the same results were obtained with the aggregating and separating apparatus according to Embodiment 3 shown in FIG.

  This was carried out using the coagulation / separation apparatus in Embodiment 4 shown in FIG. The implementation conditions were the same as in Example 1. However, in the coagulation / separation apparatus in Embodiment 4 shown in FIG. 4, punching metal connected to the upper part of the partition plate 41 is used as the porous member 44, and the guide plate 45 is provided horizontally. Based on these conditions, the implementation results as shown in Table 3 were obtained regarding the relationship among the inflow water amount, apparatus residence time, raw water SS, treated water SS, SS removal rate, sludge concentration, and sludge extraction amount. As can be seen from Table 3, the SS removal rate was 80% or more after 5 minutes of the apparatus residence time, and treated water with good water quality could be obtained. The reason why the residence time with an SS removal rate of 80% or more was shortened was that the provision of the guide plate 45 facilitated the efficient aggregation and formed the aggregated sludge in a short time. The amount of sludge extraction was 6% with respect to the amount of inflow water. Note that substantially the same results were obtained with the coagulation / separation device in the fifth embodiment shown in FIG. 6, the coagulation / separation device in the sixth embodiment shown in FIG. 8, and the coagulation / separation device in the seventh embodiment shown in FIG.

It is a flowchart of the coagulation separation apparatus by Embodiment 1 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 2 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 3 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 4 of this invention. It is a top view of the porous member in Embodiment 4 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 5 of this invention. It is a top view of the porous member in Embodiment 5 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 6 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 7 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 8 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 9 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 10 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 11 of this invention. It is a principal part flowchart of the coagulation-separation apparatus by Embodiment 12 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 13 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 14 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 15 of this invention. It is a principal part flowchart of the coagulation separation apparatus by Embodiment 16 of this invention. It is a perspective view which shows the trough used for a water collector. It is a perspective view which shows the trough used for a water collector. It is a perspective view which shows the trough used for a water collector. It is a fragmentary sectional view which shows the trough used for a water collector. It is a fragmentary sectional view which shows the trough used for a water collector. It is a fragmentary sectional view which shows the water collector using a filter medium. It is a fragmentary sectional view which shows the water collector using a filter medium. It is a top view which shows a rectangular aggregation separation tank and a square frustum-shaped partition plate. It is a top view of the aggregation separation tank which has a partition plate in four corners. It is a perspective view which shows a circular aggregation separation tank and a frustoconical partition plate. It is sectional drawing of the aggregation separation tank which has a haunch in the four corners of a bottom part. It is sectional drawing of the aggregation separation tank which has an inclined side wall. It is sectional drawing of a hopper type | mold aggregation separation tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A-1D Coagulation separation tank 2 Mixing tank 2A Line mixer 4 High specific gravity material addition equipment 3, 5 Raw water introduction pipe 6 Flocculant 7 Screen 8, 8A Separator 9 High specific gravity material 10 Aggregation aid 11 Water flow generator 11a Stirring Blade 12, 12A-12C, 61-65 Water collector 13, 21, 31, 32, 41, 51, 51A, 71, 72, 73 Partition plate 14, 22, 33, 42, 52 Mud collection box 15, 18 Sludge Transfer pipe 23, 34, 43, 53 Transfer port 44, 44A-44C Porous member 44D, 44E Current plate

Claims (4)

  A coagulation separation tank into which raw water mixed with a coagulant flows, a water flow generator for generating a swirling flow in the coagulation separation tank, a mud collection box partitioned by a wall surface and a partition plate, and sludge transfer for transferring the coagulation sludge An aggregating and separating apparatus comprising a tube.   The coagulation / separation apparatus according to claim 1, wherein a high specific gravity material is present in the coagulation / separation tank. The coagulation / separation apparatus according to claim 1, wherein the sludge transfer pipe is provided with a separator that separates a high specific gravity material and circulates it in the coagulation separation tank.   The said water flow generator is a stirrer provided with the axial flow type stirring blade, The coagulation separation apparatus in any one of Claim 1 to 3 characterized by the above-mentioned.

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