WO2008032422A1

WO2008032422A1 - Flocculator

Info

Publication number: WO2008032422A1
Application number: PCT/JP2006/325607
Authority: WO
Inventors: Tatsuo Hiramatsu
Original assignee: Tomoe Engineering Co., Ltd.
Priority date: 2006-09-12
Filing date: 2006-12-22
Publication date: 2008-03-20
Also published as: KR101130605B1; JP4223528B2; JP2008068153A; CN101443091A; CN101443091B; KR20090010165A

Abstract

Provided is a flocculator in which the conditioning operation can be continuously and smoothly performed, and flocks can be efficiently formed, despite the fact that the flocculator is single tank type. Stirring blades (8a, 8b) capable of rotating at different speeds are installed in a single tank so that both the operations of quick stirring and slow stirring can be simultaneously performed in the tank. Rotation drive forces are supplied to the stirring blades (8a, 8b) by motors (6a, 6b) separately connected to the blades through shafts (7a, 7b).

Description

Specification

Technical Field

TECHNICAL FIELD [0001] The present invention relates to a floculator used for preconditioning sludge and the like supplied to a dehydrator in a sludge dewatering system.

Background art

[0002] When a processing stock solution such as sludge is to be dehydrated, a polymer flocculant is added to the processing stock solution in advance to form a floc floc in the processing stock so that the dehydration process can be performed efficiently. And! / ヽぅ process (tempering) is carried out!

Conventionally, a flocculator (aggregation tank) 31 as shown in FIG. 6 has been widely used for refining the processing stock solution. In a general dehydration system, the flocculator 31 is arranged on the upstream side of the dehydrator, and the raw material processing force conditioned in the flocculator 31 is sequentially flowed down to the dehydrator! .

[0004] The flocculator 31 is usually provided with a stirring device 35 constituted by a motor 36, a shaft 37, a stirring blade 38 and the like. In the example of FIG. 6, the rotational driving force of the motor 36 is transmitted to the stirring blade 38 via the shaft 37, and the stirring blade 38 rotates around the shaft 37 at a desired speed.

[0005] When refining the processing stock solution using the flocculator 31 shown in FIG. 6, first, the processing stock solution is removed with the valve (not shown) on the pipe connected to the processing stock solution outlet 33 closed. Supply from inlet 32 and store in tank. At this time, a polymer flocculant in an appropriate ratio with respect to the inflow amount of the processing stock solution is added from the inlet 34. When the processing stock solution that has flowed into the tank reaches a predetermined level, the processing stock solution and the polymer flocculant are mixed by the stirring device 35 (by rotating the stirring blade 38). As a result, the solid particles suspended and dispersed in the processing stock solution gradually aggregate to form flocs. When the polymer flocculant has sufficiently reacted and flocs are sufficiently formed, the processing stock solution containing flocs is discharged from the outlet 33 and supplied to a dewatering machine or the like.

[0006] In order to efficiently form a floc, the stirrer 35 is simply driven at a constant speed. It is preferable to adjust the stirring speed appropriately depending on the stage of the reaction. For example, initially, the stirring blade 38 is vigorously rotated (rapid stirring), the solid particles in the processing stock solution collide with the high molecular flocculant, and when they are sufficiently mixed, the stirring speed is reduced (slow stirring). If the formation of floc is promoted, the floc can be formed efficiently.

Disclosure of the invention

Problems to be solved by the invention

[0007] In the case of adjusting the stirring speed as described above during the refining by the flocculator 31 in FIG. 6 while applying a force, the processing stock solution storage, rapid stirring, slow stirring, and discharge of the processing stock solution are referred to as As a result, the number of processes has increased! /, And tempering work cannot be carried out smoothly and continuously.

[0008] Therefore, two storage tanks (first tank and second tank) are arranged in series, the first tank is used for rapid stirring, the second tank is used for slow stirring, and the processing stock solution flows down sequentially. There is also a power that is configured in such a way (two-tank type flocrator). The two-tank type flocrator requires a wider installation space than the one-tank type as shown in Fig. 6, so there is enough space. If not, there is a problem that installation is difficult. In addition, in the conventional two-tank type floatulator, the first tank also supplies the processing stock solution to the second tank by overflow (that is, the processing stock solution overflowed from the first tank flows to the second tank. Therefore, there was a problem that the flocculator was not installed in the closed conduit and the processing stock solution could not be pumped by the pump.

[0009] The present invention was made to solve the above-described problems of the prior art, and although it is a single tank type, refining work can be performed continuously and smoothly, and in a short time. It is an object of the present invention to provide a flocculator that can form a block efficiently.

Means for solving the problem

[0010] The floatator of the present invention is provided with a plurality of stirring blades that can be rotated at different speeds in one tank, so that rapid stirring and slow stirring can be simultaneously performed in one tank. It is characterized by being configured. The plurality of stirring blades may be configured such that the rotational driving force is supplied by a plurality of individually connected motors, or appropriate power distribution means ( Via gear or pulley) A plurality of stirring blades may be connected so that the stirring blades rotate at different speeds.

[0011] In addition, it is preferable that the capacity can be changed, so that a part of the wall or the bottom of the flocculator is preferably movable so that the capacity can be changed. Is preferred.

The invention's effect

[0012] According to the floatator of the present invention, rapid stirring and slow stirring can be performed simultaneously in one tank, so that the tempering operation can be performed smoothly and continuously even though it is a single tank type. Flock can be formed efficiently in time. In addition, the “two-component method”, which was difficult to apply in the past, can be applied.

[0013] Further, when the capacity of the tank can be freely changed, it is possible to appropriately cope with a change in the amount of the processing stock solution supplied or a change in the properties of the processing stock solution. As a result, tempering and subsequent dehydration can be optimized. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, the best mode for carrying out a flocculator according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram of a floatulator 1 according to a first embodiment of the present invention. In this figure, 2 is a processing stock solution inlet, 3 is an outlet, 4 is a polymer flocculant inlet, and 5 (5a, 5b) are stirring devices.

[0015] As shown in the figure, in the present embodiment, two stirring devices 5 are vertically attached. These stirring devices 5a and 5b are composed of motors 6a and 6b, shafts 7a and 7b, stirring blades 8a.

8b, and the lower stirring device 5b is configured to be driven at a lower speed than the upper stirring device 5a.

[0016] The flocculator 1 of this embodiment can simultaneously perform rapid stirring and slow stirring by simultaneously driving these two stirring devices 5a and 5b. Quality work can be performed smoothly.

[0017] More specifically, first, the processing stock solution is introduced from the inlet 2 with the valve (not shown) on the pipe connected to the processing stock solution outlet 3 closed, and the processing stock solution Add a polymer flocculant in an appropriate proportion to the inflow rate from the inlet 4. Incoming processing stock solution When the pressure reaches a predetermined level in the tank, the stirring devices 5a and 5b are driven.

[0018] At this time, since the upper stirring device 5a is driven at a high speed and the lower stirring device 5b is driven at a low speed, solid particles in the processing stock solution are rapidly stirred in the upper half of the flocculator 1. And the polymer flocculant can collide with each other and can be quickly mixed. Then, the processing stock solution sufficiently mixed with the high-molecular flocculant gradually descends to the lower half, and the slow stirring in the lower half promotes the formation of flocs. Can be realized.

[0019] As one of the tempering methods, a method called "two-component method" (a tempering method using both an iron-based or aluminum-based inorganic flocculant and a polymer flocculant (amphoteric)). There is. This method is mainly implemented in a two-tank type flocrator, and the force that was difficult to apply in a conventional one-tank type floculator is the same as that in the present embodiment. Liquid methods can be applied.

Next, a second embodiment of the present invention will be described. FIG. 2 is a configuration diagram of the floatulator 1 according to the second embodiment of the present invention. As shown in the figure, in this flocculator 1, four agitators 5a to 5d are arranged in parallel in the vertical direction.

In the flocculator 1 in FIG. 1, the shafts 7a and 7b of the stirring devices 5a and 5b extend in the vertical direction, and the stirring blades 8a and 8b are configured to rotate around the vertical axis. In the form of the flocculator 1, the shafts 7 a to 7 d extend in the horizontal direction, and the stirring blades 8 a to 8 d are configured to rotate around the horizontal axis.

Of these stirring devices 5a to 5d, the second-stage stirring device 5b is slightly slower than the uppermost stirring device 5a. The third-stage stirring device 5c is slightly more than the second-stage stirring device 5b. The slowest stirrer 5d is configured to be driven slightly slower than the third stirrer 5c. In other words, the rotational speed of the stirring blade 8 is gradually lowered from the upper stage to the lower stage.

[0023] The flocculator 1 of this embodiment is driven by these four stirring devices 5a to 5d simultaneously, thereby promoting mixing with the polymer flocculant and flock formation in a more ideal form. You can make progress. Specifically, at the top of the flocculator 1, the solid particles in the processing stock solution collide with the polymer flocculant by rapid stirring to quickly mix them. As the treatment stock solution is lowered, the stirring speed gradually decreases, so that the state force suitable for mixing can be smoothly shifted to a state suitable for floc formation, further increasing the aggregation effect. Improvement and smoothness of refining work can be realized.

[0024] In the flocculator 1 of Fig. 2, four motors 6a to 6d are used for the four stirring devices 5a to 5d, and the shaft 7 or the stirring blade 8 and the motor 6 are 1 There is a one-to-one correspondence, but as shown in Fig. 3, the two shafts 7a, 7b (7c, 7d) are connected to one motor 6a (6c). Further, as shown in FIG. 4, it is also possible to adopt a configuration in which three shafts 7a to 7c are connected to one motor 6.

[0025] In these cases, by appropriately adjusting the size of the pulleys 9a to 9d (power distribution means) for transmitting power, for example, in the flocculator 1 of FIG. 3 (or FIG. 4), The lower stage pulley 9b is made larger than the pulley 9a, and the upper stage pulley 9c (9b ') is made smaller than the lowermost stage pulley 9d (9c). It is preferable to configure so that the rotation speed becomes gradually lower. With such a configuration, the initial cost and running cost of the motor 6 can be reduced. The power distribution means is not limited to the pulley 9 as shown in FIGS. 3 and 4, and a gear mechanism or the like can be used.

[0026] Next, a third embodiment of the present invention will be described. FIG. 5 is a configuration diagram of the floatulator 1 according to the third embodiment of the present invention. As shown in the figure, in the floating unit 1, as in the floating unit 1 in FIG. 1, two stirring devices 5a and 5b are arranged in parallel in the up and down direction, Slow agitation can be performed simultaneously.

In the flocculator 1 shown in FIG. 5, the bottom portion 11 is configured to be slidable in the vertical direction, whereby the capacity of the flocculator 1 can be freely changed. More specifically, the bottom portion 11 has a driving force (electrical, hydraulic, pneumatic, steam pressure, etc.) (not shown) within the range of the position force indicated by the solid line in FIG. It is possible to move in the vertical direction by a device that supplies driving force using the), and at the contact portion (the outer peripheral surface of the bottom portion 11 in contact with the inner peripheral surface of the flocculator 1), the processing stock solution in the tank is Measures are taken to prevent leakage to the outside, and the watertightness inside the tank is maintained. It is.

[0028] Further, in response to the fact that the bottom 11 is movable, in this flocculator 1, three outlets 3a to 3c for the processing solution are provided in parallel in the vertical direction. The processing stock solution is discharged from one outlet 3 that is appropriately selected according to the position. More specifically, when tempering is performed by setting the bottom 11 to the position of the solid line in FIG. 5, the bottom outlet 11a is opened to discharge the processing stock solution, and the bottom 11 is shown by the broken line in FIG. When tempering is performed at the position, open the top outlet 3c and discharge. When the bottom 11 is set at an intermediate position for tempering, the middle outlet 3b is opened to discharge the processing stock solution.

[0029] In the flocculator 1 of the present embodiment, as described above, the bottom 11 is movable, and the capacity can be freely changed. Therefore, when the supply amount of the processing stock solution is changed, When the properties of the processing stock changes! As a result, it can be dealt with appropriately, and as a result, tempering and subsequent dehydration can be optimized.

[0030] For example, in the case where the flocculator 1 or the dewatering system including the flocculator 1 of the present embodiment is used for sludge treatment, a multi-channel dehydrator (a single press filter or the like) is connected to the downstream side of the flocculator 1. When it is necessary to change the sludge supply amount by changing the number of channels, it is possible to appropriately control the amount of sludge supplied to the dewatering machine by changing the capacity of the flocculator 1. it can.

[0031] Further, when the property such as moisture content of sludge changes, if the supply amount is constant, the moisture content of the sludge cake (dehydrated cake) discharged by the dehydrator may not be uniform. Force It is possible to constantly monitor the moisture content of sludge that is treated continuously, calculate the appropriate supply amount according to changes in properties, and change the capacity of the flocculator 1.

In the flocculator 1 shown in FIG. 5, the shaft 7b of the lower stirring device 5b passes through the bottom 11, and when the bottom 11 moves in the vertical direction, the motor 6b, the shaft 7b, The stirring blade 8b is also configured to move together with the stirring blade 8b. It is not necessarily limited to the configuration that applies force. For example, in the flocculator 1 shown in FIG. 2, the movable type shown in FIG. When applying the base 11, the base 11 is connected to the shaft 7 shown in FIG. 7d, 7c) and stirring blades 8 (especially 8d, 8c), etc., and can be configured to move at a position where they do not interfere with each other. The stirring blade 8 can be configured to be retracted to a position where it does not interfere with the stirring blade 8 or to be removed as appropriate.

[0033] Further, a part of the wall surface connected to the bottom 11 may be movable so that the capacity in the tank can be changed.

Brief Description of Drawings

[0034] FIG. 1 is a configuration diagram of a floatulator 1 according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a floatulator 1 according to a second embodiment of the present invention.

FIG. 3 is a diagram showing another configuration example of the floating modulator 1 according to the second embodiment of the present invention.

FIG. 4 is a diagram showing another configuration example of the floating modulator 1 according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram of a floatulator 1 according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional floatator 31.

Explanation of symbols

[0035] 1, 31: Floulator,

2, 32: Inlet for processing stock solution,

3, 3a, 3b, 3c, 33: Outflow of processing stock solution,

4, 34: Polymer flocculant inlet,

5, 5a-5d, 35: Stirrer,

D, 6a-od, 36:

7, 7a-7d, 37: shaft,

8, 8a to 8d, 38: stirring blade,

9, 9a to 9d: pulley,

10a, 10b: Bell

11: Bottom

Claims

The scope of the claims

[1] A floculator comprising a plurality of stirring blades that can be rotated at different speeds in one tank, and configured so that rapid stirring and slow stirring can be simultaneously performed in one tank. .

[2] The floatulator according to claim 1, wherein the plurality of stirring blades are configured to be supplied with a rotational driving force by a plurality of motors individually connected to each other.

[3] The flocculator according to claim 1, wherein the plurality of stirring blades are connected to a single motor via a power distribution unit and are configured to rotate at different speeds. .

[4] The flocculator according to any one of claims 1 to 3, wherein the capacity can be changed by configuring such that a part or bottom of the wall is movable in a predetermined direction.