JP7250244B2 - Vibrational coagulator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibrating coagulator used for coagulating sludge to be dewatered in water treatment facilities or the like.

Conventionally, when dehydrating sludge using a dehydrator such as a screw press or belt press, flocs are formed by supplying a polymer flocculant or an inorganic flocculant to the sludge as a pretreatment operation and stirring and mixing in a flocculator. It is well known to let By uniformly mixing and reacting an appropriate amount of flocculant in sludge, good-quality flocs are formed, and the sludge with good-quality flocs has improved dewaterability and efficiency of dewatering treatment.
A flocculating device that agitates and mixes sludge and a flocculant with an agitating blade swirling in a treatment tank is known as described in Patent Document 1.

JP-A-05-192699

The flocculation device that rotates the stirring blades as in Patent Document 1 has a weak stirring and mixing effect, and the sludge is retained in the flocculation device for several minutes, and good quality flocs cannot be formed unless the sludge is stirred and mixed with the flocculant. rice field. In addition, since it takes a long time to form flocs, it was necessary to provide a large casing to secure a residence time in order to continuously generate flocculated sludge.

The present invention provides a vibration-type flocculating device that rapidly agitates and mixes sludge and a flocculant supplied to a casing by vertically vibrating screw-type agitating blades provided in the casing.

A stirring body composed of a stirring shaft and stirring blades, a cylindrical casing provided with the stirring body inside and divided into a plurality of cylinders above and below the stirring body , a flange connecting each cylinder, and a flange An annular partition plate sandwiched between and extending above and below the stirring blades to the vicinity of the stirring shaft, a driving device for vertically vibrating the stirring body, and an upper lid through which the stirring shaft penetrates and closes the upper end of the casing. a bottom lid that closes the lower end of the casing; a sludge supply pipe that is connected to the bottom lid and continuously supplies sludge; and a coagulant supply that is connected to the sludge supply pipe or the bottom lid and adds a coagulant to the sludge. By providing the pipe and the discharge pipe connected to the upper lid to discharge the aggregated sludge, the sludge can be continuously aggregated to obtain good quality aggregated sludge.

The agitating body is configured by winding spiral agitating blades around an agitating shaft, and by connecting the agitating shaft and a driving device, the sludge can be made to flow by the agitating blades.

The agitating body is configured by arranging a plurality of disk-shaped agitating blades perpendicularly to the agitating shaft, and by connecting the agitating shaft and a driving device, the sludge can be made to flow by the agitating blades.

According to this invention, since the sludge and the coagulant in the casing repeatedly flow due to the vibration of the agitator, the coagulated sludge can be generated in a short period of time during which the sludge circulates in the casing. Since flocculated sludge can be generated in a short period of time, it is possible to shorten the retention time in the casing and eliminate the need for a large flocculating device. The vibration of the agitator causes the flocculant to efficiently react with the sludge, forming good flocculation.

1 is a cross-sectional view of a vibratory aggregation device according to the present invention; FIG. Similarly, it is a fragmentary cross-sectional view of the vibratory aggregation device. FIG. 4A is a side view and a plan view of a stirrer according to another embodiment of the present invention; 1 is a schematic diagram of a vibrating aggregation device according to the present invention; FIG. Similarly, it is a schematic diagram of a vibrating aggregation device.

FIG. 1 is a cross-sectional view of a vibratory aggregation device according to the present invention.
A vibratory coagulator 1 of the present invention comprises a cylindrical casing 2, a stirring body 3 capable of vibrating vertically inside the casing 2, a sludge supply pipe 4 connected to the lower part of the casing 2, and connected to the upper part of the casing 2. A discharge pipe 5 for flocculated sludge and a driving device 6 arranged outside the casing 2 for driving the agitator 3 are provided.

The stirring body 3 is composed of a stirring shaft 7 and stirring blades 8 provided on the stirring shaft 7 , and the stirring blades 8 are arranged along the inner peripheral surface of the casing 2 . The casing 2 comprises a cylindrical body 9 , a bottom lid 10 closing the lower end of the cylindrical body 9 , and a top lid 11 closing the upper end of the cylindrical body 9 . Sludge is supplied to the inside of the casing 2 through a sludge supply pipe 4 connected to the opening of the bottom lid 10 , and aggregated sludge is discharged to the outside of the casing 2 through a discharge pipe 5 connected to the opening of the top lid 11 . In this embodiment, the sludge supply pipe 4 and the discharge pipe 5 are connected to the bottom lid 10 and the top lid 11, but the sludge supply pipe 4 is connected to the lower side wall of the cylinder 9, and the discharge pipe 5 may be connected.

The upper end of the stirring shaft 7 passes through the upper lid 11 and is connected to the driving device 6 provided outside the casing 2 . A driving device 6 is arranged above the casing 2 and is composed of a driving machine 12 and a crank mechanism 13 . The crank mechanism 13 converts the rotation of the driving machine 12 into vertical vibration and transmits it to the stirring shaft 7 connected to the crank mechanism 13 . The drive device 6 drives the agitator 3 to vibrate up and down. The sliding portion between the stirring shaft 7 and the upper lid 11 is sealed with a known sealing member.

A coagulant supply pipe 14 is connected to the sludge supply pipe 4 , and the coagulant is supplied into the casing 2 together with the sludge by adding the coagulant to the sludge. The sludge stirred and mixed in the casing 2 reacts with the flocculant to form flocculated flocs. The sludge forming flocculated flocs (coagulated sludge) is conveyed to the upper part of the casing 2 and discharged from the discharge pipe 5 . The coagulant supply pipe 14 may be directly connected to the bottom cover 10 or the lower side surface of the cylindrical body 9 on the upstream side of the stirring body 3 . Flocculants are added to the sludge in powder or liquid form. Sludge and coagulant are continuously supplied into the casing 2 by a supply device (not shown).

FIG. 2 is a cross-sectional view of the essential part of the vibratory aggregation device according to the present invention.
The stirring body 3 is composed of a stirring shaft 7 and a stirring blade 8 wound around the stirring shaft 7. In FIG. 2, the stirring blade 8 is a helical screw blade. Between the outer edge of the stirring blade 8 and the inner wall of the casing 2, a gap is provided through which sludge can pass. By vibrating the agitator 3 up and down, the sludge flows through the gap between the agitating blade 8 and the casing 2, and the sludge and the coagulant are agitated and mixed. Further, the stirring blade 8 is provided with a plurality of flow holes 15 . Vibration of the agitator 3 causes the sludge to flow through the circulation holes 15, and the sludge and the coagulant are agitated and mixed.

If the gap between the stirring blade 8 and the casing 2 is set to a width of 2 to 4 mm, the residue in the sludge will not be clogged. A jet flow is generated and the sludge can be made to flow.

A partition plate 16 projecting from the inner wall of the casing 2 is arranged above and below the stirring body 3 . The partition plate 16 is disc-shaped and has a through hole 17 in the center through which the stirring shaft 7 passes. The inner periphery of the through hole 17 extends to the vicinity of the stirring shaft 7, and a predetermined gap is provided between the partition plate 16 and the stirring shaft 7 through which sludge can pass. By vibrating the agitating body 3 up and down, the sludge flows through the gap between the partition plate 16 and the agitating shaft 7, and the sludge and the coagulant are agitated and mixed.

In this embodiment, the cylindrical body 9 has a structure that can be divided into a plurality of parts above and below the stirring body 3 . The split cylindrical body 9 connects flanges 18 provided at both ends thereof. The partition plate 16 is arranged so as to be sandwiched between the flanges 18 . By making the cylindrical body 9 divisible, the attachment and detachment of the stirring body 3 is facilitated, and the maintainability is improved. In addition, the divided cylindrical body 9 and the stirring body 3 may be continuously provided to form a serial multi-stage structure. Further, as shown in FIG. 1, the top lid 11 and the bottom lid 10 may be detachably connected to the flanges 18 at the top and bottom ends of the cylindrical body 9 connected in multiple stages. The upper lid 11 and the bottom lid 10 may be integrated by welding or the like without providing the lid 18 .

A support shaft 19 is erected at the center of the upper portion of the bottom lid 10, and an insertion hole 20 through which the stirring shaft 7 can be inserted is provided at the upper portion of the support shaft 19. As shown in FIG. By inserting the stirring shaft 7 into the insertion hole 20 of the support shaft 19 and supporting it, the stirring body 3 is supported so as to vibrate vertically. The stirring shaft 7 may be provided through the bottom lid 10. In that case, the support shaft 19 is provided at the bottom of the bottom lid 10, or the stirring shaft 7 is provided upright on a pedestal (not shown) provided outside the casing 2. may support. By supporting the stirring shaft 7 with the support shaft 19, the vibration of the stirring body 3 can be stabilized even with a highly viscous fluid such as sludge.

FIG. 3 is a side view and a plan view of a stirrer according to another embodiment of the present invention.
FIG. 3(a) shows a stirring body 3 in which a spiral stirring blade 8 is wound around a stirring shaft 7. A plurality of flow holes 15 are provided in the stirring blade 8, and a plurality of notches 21 is provided. Vibration of the agitator 3 causes the sludge to flow through the flow holes 15 and the cutouts 21 . The spiral stirring blades 8 are appropriately set according to the properties of the sludge, such as the pitch and the number of threads.

FIG. 3(b) shows a stirrer 3 in which a plurality of disk-shaped stirring blades 8 are arranged vertically on a stirring shaft 7. A notch 21 is provided. Vibration of the agitator 3 causes the sludge to flow through the flow holes 15 and the cutouts 21 . The disk-shaped stirring blades 8 are appropriately set according to the properties of the sludge, such as the number and intervals.

4 and 5 are schematic diagrams of a vibratory aggregation device according to the present invention.
The vibratory coagulator 1 of the present invention is a device that continuously supplies sludge and a flocculant to continuously generate coagulated sludge. do.

FIG. 4( a ): First, sludge and coagulant are continuously supplied from the sludge supply pipe 4 connected to the lower part of the casing 2 . When the sludge and flocculant are supplied, the gap between the partition plate 16a at the bottom of the casing 2 and the stirring shaft 7, the flow path of the spiral stirring blade 8, the circulation hole 15 of the stirring blade 8, or the gap between the stirring blade 8 and the casing 2 Sludge and coagulant flow into the casing 2 through .

FIG. 4(b): Next, the driving device 6 moves the stirring blade 8 upward. Sludge and coagulant are continuously supplied from the sludge supply pipe 4, and the liquid level rises. Sludge and coagulant will be supplied continuously thereafter. When the stirring blade 8 moves upward, the sludge and flocculant contained in the stirring blade 8 rapidly move upstream of the stirring blade 8 through the gap between the stirring blade 8 and the casing 2 and the flow holes 15 of the stirring blade 8. transferred to the side. The sludge and flocculant are rapidly transported and fluidized and agitated and mixed.

FIG. 5(c): Next, the driving device 6 moves the stirring blade 8 downward. When the stirring blade 8 moves downward, the sludge and flocculant on the downstream side of the partition plate 16a are rapidly passed through the gap between the stirring blade 8 and the casing 2, or the flow hole 15 of the stirring blade 8, into the inside of the stirring blade 8. transferred to Also, the sludge and flocculant contained in the stirring blades 8 are rapidly transported to the downstream side of the stirring blades 8 through the gaps between the stirring blades 8 and the casing 2 or through the flow holes 15 of the stirring blades 8 . Inside the stirring blade 8, on the downstream side, the sludge and the flocculant are rapidly transported to flow and are stirred and mixed.

FIG. 5(d): Next, the driving device 6 moves the stirring blade 8 upward again. When the stirring blade 8 moves upward, the sludge and flocculant contained in the stirring blade 8 rapidly move upstream of the stirring blade 8 through the gap between the stirring blade 8 and the casing 2 and the flow holes 15 of the stirring blade 8. transferred to the side. Furthermore, the sludge and flocculant on the downstream side of the stirring blade 8 are rapidly transported into the stirring blade 8 through the gap between the stirring blade 8 and the casing 2 and the flow holes 15 of the stirring blade 8 . On the upstream side of the stirring blade 8, inside, the sludge and the flocculant are rapidly transported and flowed to be stirred and mixed. Since the sludge and the coagulant continue to be supplied, the agitated and mixed coagulated sludge passes through the gap between the partition plate 16b and the agitating shaft 7, flows out above the partition plate 16b, and is discharged from the discharge pipe 5.

As shown in FIGS. 4 and 5, the sludge is conveyed by continuously supplying the sludge and the coagulant to the casing 2, and the sludge and the coagulant are frequently stirred and mixed by repeating the vertical vibration of the stirring body 3. Agglomerated sludge is generated inside the casing 2 by stirring and mixing, and is discharged from the discharge pipe 5 connected to the upper lid 11 of the casing 2 . Vibration of the agitating body 3 causes a large flow in the casing 2, so that the sludge and the coagulant are sufficiently agitated and mixed in a short period of time when the sludge flows through the casing 2, and good quality flocculated sludge is produced.

2 Casing 3 Stirrer 4 Sludge supply pipe
5 discharge pipe
6 Drive device 7 Stirring shaft 8 Stirring blade 9 Cylindrical body 10 Bottom lid 11 Top lid 14 Coagulant supply pipe
16 Partition plate 18 Flange 19 Spindle

Claims (3)

a stirring body (3) composed of a stirring shaft (7) and stirring blades (8);
a cylindrical casing (2) provided with an agitating body (3) inside and divided into a plurality of cylindrical bodies (9) above and below the agitating body (3 );
a flange (18) connecting each cylinder (9);
An annular partition plate (16) sandwiched between the flanges (18) and extending above and below the stirring blades (8) to the vicinity of the stirring shaft (7);
a driving device (6) for vertically vibrating the stirring body (3);
an upper lid (11) through which the stirring shaft (7) penetrates to close the upper end of the casing (2);
a bottom lid (10) closing the lower end of the casing;
A sludge supply pipe (4) connected to the bottom cover (10) and continuously supplying sludge;
A flocculant supply pipe (14) connected to the sludge supply pipe (4) or the bottom lid (10) to add a flocculant to the sludge;
A discharge pipe (5) connected to the upper lid (11) for discharging the flocculated sludge;
A vibratory aggregation device comprising: The stirring body (3) is configured by winding a spiral stirring blade (8) around a stirring shaft (7),
2. A vibrating agglomerating device according to claim 1, characterized in that the stirring shaft (7) and the drive (6) are connected. The stirring body (3) is configured by arranging a plurality of disk-shaped stirring blades (8) vertically on a stirring shaft (7),
2. A vibrating agglomerating device according to claim 1, characterized in that the stirring shaft (7) and the drive (6) are connected.

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