JP3146372B2 - Coagulation reaction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for receiving sludge and a coagulant at the bottom of a treatment tank and agitating the sludge with a plurality of agitating blades in a vertical direction which horizontally turns in the tank to coagulate and granulate the sludge. The present invention relates to an agglomeration treatment apparatus for aggregating and granulating sludge by stirring with a plurality of stirring blades, and discharging the sludge from the upper part of the treatment tank to the outside.

[0002]

2. Description of the Related Art As such an aggregating apparatus, a lower blade has a base plate width smaller than that of a tip portion so that a lower stirring blade generates a vertical circulating flow, and an upper stirring blade has a horizontal stirring blade. To make a swirling flow, flat radial wings with a constant width in the height direction of the tank are used in Japanese Patent Publication No. 2-8.
No. 761. The lower blade-type swept wing swirls to eject the sludge in the center of the bottom inside the tank strongly outward, and the flow separates into rising and descending flows near the inner circumference of the treatment tank while turning, The flow comes into contact with the horizontal swirling flow generated by the flat radial vanes in the upper part of the tank, and descends while swirling toward the center of the bottom of the processing tank. Further, the descending flow rises toward the center while rotating along the bottom surface of the processing tank. In this way, at the bottom of the tank, the swirling of the vane-plate-type swept wing produces a similar upper and lower swirling flow, which violently mixes at the center of the tank, improving the mixing effect of the sludge and the flocculant. This promotes the contact and congruence of the flocs and granulates them into large and strong pellets.

[0003]

However, depending on the type of sludge, the sludge has a large property. In that case, the sludge floats on the surface of the liquid, turns as a scum, turns around the surface of the liquid, and subsequently floats one after another. The scum is combined with the scum to form a compact and large agglomerates, resulting in extremely poor granulation efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed in view of the above, and comprises fixing a granulating plate inclined in the swirling direction of a stirring blade in a processing tank in a radial direction, and attaching the granulating plate to a tank. It is characterized in that it rushes downward from the liquid level inside.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, reference numeral 1 denotes a cylindrical processing tank, 2 is a vertically installed central part of the processing tank 1, and a rotating shaft driven in one direction by a motor and a transmission. A sludge pipe for supplying sludge to the bottom, and a chemical injection pipe 4 for adding a flocculant such as an amphoteric polymer to sludge is connected in the middle of the sludge pipe. The upper end of the rotating shaft 2 is supported by a support 5 extending in a bridge form on the upper surface of the processing tank 1, and the motor and the transmission are installed on the support 5.

In this embodiment, stirring blades 10 and 12 are mounted on the rotating shaft 2 at two upper and lower stages in a substantially radial manner. The upper stage stirring blade 10 is a wide flat plate-shaped radial blade 11 having a constant width in the height direction of the tank over the entire length.
Two pieces are attached with a phase of 80 °. The lower stirring blade 12 has a disk 13 fixed horizontally and concentrically with respect to the rotating shaft 2, and a base 14 a fixed perpendicularly to the peripheral edge of the disk 13 in a direction perpendicular to the rotating shaft 2. On the other hand, the flat-type swept wings 14 are curved so as to retreat, and the flat-shaped swept wings also have a constant width in the height direction of the tank from the wide end of the divergent base to the tip as shown in the figure, and It is fixed at a phase of 180 ° with respect to the peripheral edge. In addition, guide plates 15 which are gradually separated from the inner periphery of the tank in the turning direction of the stirring blades 10 and 180 are provided on the inner periphery of the bottom portion and the inner periphery of the middle portion of the treatment tank.
Two sheets are provided with a phase of °.

When the rotating shaft 2 is rotated while supplying sludge to which a coagulant is added to the bottom of the treatment tank by the supply pipe 3, the upper stirring blades 10 and the lower stirring blades 12 rotate integrally, and the upper stirring blades rotate. Is a flat radial blade 11, a horizontal swirling flow A is generated in the upper part of the tank, and at the bottom of the tank, the disk 13 of the lower stirring blade becomes the handle part of the blade, and the plate-shaped retreat blade 14 becomes the plate part of the blade. Since the flat swept wings are curved so as to recede in the swirling direction as a whole, the swirling strongly extrudes the sludge at the center of the bottom of the tank, and the flow swirls to the treatment tank while swirling. In the vicinity of the inner circumference of 1, the ascending flow separates into an ascending flow and a descending flow, and the ascending flow comes into contact with the horizontal swirling flow A generated by the upper stirring blades in the upper part of the tank and descends while swirling toward the center of the bottom of the processing tank. Circulating upper circulating flow B, and the descending flow is Turning along the bottom surface of the physical vessel becomes lower swirling circulation B 'which rises towards the intracisternal center. The guide plate 15 on the inner periphery of the middle part promotes the upper swirling flow B to descend toward the center of the tank while swirling. Facilitates climbing towards the department.

The upper swirling flow B descending toward the center of the bottom and circulating in the tank and the lower swirling flow B 'rising toward the center of the bottom and circulating are formed by the disk 1
3, each swirling circulation flow B, B 'circulates without losing momentum, and has a large momentum,
A continuous and uniform swirling circulation flow is formed, and the sludge that is going to accumulate on the disk 13 and the sludge that is going to stay under the disk 13 are caught in the flow and cannot be accumulated or stay. In this way, the sludge and the flocculant supplied from the mud feed pipe 3 to the bottom of the tank are mixed sufficiently on the upper and lower swirling circulation flows B and B ', grow into flocs, and some flocs come into contact and meet. Into sludge lumps. The flocks and sludge blocks moving on the upper and lower swirling circulation flows B and B 'are gradually pushed up by the subsequent sludge supplied to the bottom of the tank, and the upper stage stirring blades 10
The floc comes in contact with and adheres to the sludge mass, and at the same time, is pressed against the inner peripheral surface of the processing tank 1 and rolls on the inner peripheral surface, increasing the density and increasing the strength. The granulated pellets are granulated large and the granulated pellets
Is discharged from

Reference numeral 16 denotes a granulating plate inclined in the direction of rotation of the stirring blades 10 and 12, and in this embodiment, is formed by a lower half portion obtained by bending a vertical plate 17 at almost the middle in the vertical direction. The angle of inclination of the granulation plate 16 with respect to the horizontal is 15 to 60 °, preferably 30 to 45 °. The granulation plate 16 is fixed to the processing tank 1 in the radial direction, and projects shallowly into the liquid from the liquid level in the tank. In the illustrated embodiment, an annular filtration tank 18 having a slit at the bottom is provided on the inner periphery of the treatment tank, and the lower half of the filtration tank 18 rushes into the liquid to separate the separated water separated from the sludge from the filtration tank. The vertical plate 17 having the inclined plate 16 is provided inside the filtration tank 18. This filtration tank 18 is faced with two semi-cylindrical plates 19, 19 having inward connecting portions at both ends as shown in FIGS.
The connecting portions 20 at opposite ends of each semi-cylindrical plate are assembled by joining them with bolts and nuts, and an upper flange 21 provided along the upper edge of the outer periphery of each plate 19 is attached to the lower surface of the bridge-like support 5. To
For example, it is fixed concentrically inside the inner periphery of the processing tank 1 with bolts, nuts and the like via an arcuate fitting 22 having a U-shaped cross section, and four fan-shaped plates 23 serving as a slit-shaped annular bottom plate are formed on the lower edge of the outer periphery. A lower flange 24 provided along the inner periphery of the treatment tank;
4 and an annular shelf 25 provided opposite thereto. For this reason, in the illustrated embodiment, two semi-cylindrical plates 19,
A vertical plate 17 is provided between the connecting portions 20 at one end of the vertical plate 17.
The inclined plate 16 is cantilevered in the processing tank in the radial direction by joining together with bolts and nuts.

[0010]

As described above, when the granulating plate 16 inclined in the turning direction of the stirring blade is provided in the radial direction in the inside of the processing tank, and when the granulating plate 16 projects shallowly below the liquid surface, it floats on the liquid surface to form scum. The sludge to be crushed hits the granulating plate 16 when turning on the liquid surface and breaks down when passing under the plate. At the same time, the sludge comes into contact with the inclined surface of the granulating plate 16 and rolls in order to escape. Granulated into pellets. Therefore, even if sludge having a large property to float on the liquid surface is supplied to the treatment tank, granulation can be performed without forming scum, and the formed scum can be used for the filtration tank 1.
There is no accident that the slit at the bottom of 8 is closed and the separated water cannot be drained out of the filtration tank 18. In addition, in the case of sludge having a low property of floating on the liquid surface, besides rolling in contact with the inner periphery of the treatment tank, the sludge rolls in contact with the plate when passing under the granulation plate, so that there is an opportunity for granulation. , And granulated into pellets having a larger particle size and an increased strength as compared with the case where there is no granulating plate.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of an agglutination reaction device.

FIG. 2 is a perspective view of the apparatus of FIG. 1 when a processing tank is partially removed.

FIG. 3 is an enlarged cross-sectional view of a part of FIG. 1 showing a mounting state of an inclined plate and a filtration tank.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of a semi-cylindrical plate constituting a filtration tank and an inclined plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Treatment tank 2 Rotor blade 3 Feed pipe 4 Chemical injection pipe 5 Support 6 Outlet of granulated pellet 10 Upper stirring blade 11 Flat radial blade 12 Lower stirring blade 13 Disk 14 Flat sweep blade 15 Guide plate 16 Grain plate

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Makoto Matsunaka 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Kurita Kogyo Co., Ltd. (56) References JP 5-192699 (JP, A) JP Hei 4-59100 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 11/14 B01D 21/01

Claims (1)

(57) [Claims] 1. A treatment tank for receiving sludge and a flocculant at a bottom portion and allowing granulated sludge to flow out from an upper portion, and a plurality of vertically mounted rotary shafts vertically mounted on a central portion of the treatment tank. In an agglomeration reaction device provided with stirring blades swirling in water in a processing tank, a granulation plate tilted in the direction of rotation of the stirring blades is fixed to a processing tank in a radial direction, and the granulation plate is placed on a liquid surface in the tank. An agglutination reaction device characterized by being pushed downward from below.