JP2006346632A - Dilution apparatus of flocculant stock liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dilution apparatus of a flocculant stock liquid with its production cost lowered, wherein water and the flocculant stock liquid are supplied into a dilution tank, these are stirred with a stirring blade and the flocculant stock liquid is diluted with water to give a flocculant having a determined concentration, and the flocculant is supplied to a floc formation apparatus. <P>SOLUTION: The flocculant stock liquid is quantitatively supplied to the dilution tank 1 by a stock liquid supplying pump 6, also water is quantitatively supplied by a water supplying pump 8, the flocculant stock liquid and water supplied to the dilution tank 1 are stirred with the stirring blade to give the flocculant, and the flocculant is pumped to the floc formation apparatus 11 by a pressurizing action of the stock liquid supplying pump 6 and the water supplying pump 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flocculant stock solution diluting apparatus for diluting a flocculant stock solution with water.

  2. Description of the Related Art Conventionally, a solid-liquid separation device that separates a liquid from a processing object including a liquid such as sludge and waste tofu is well known (see Patent Documents 1 and 2). In order to solid-liquid-separate a process target object by such a solid-liquid separation apparatus, it is necessary to add a flocculant to the process target object before a process, and to flock this. Therefore, conventionally, the flocculant stock solution diluting device is used to dilute the flocculant stock solution with water to obtain the flocculant, and the flocculant is sent to the flocking device, and the processing object is sent to the flocking device, and the processing A flocculant is added to the object to flock it.

  FIG. 6 is a schematic partial cross-sectional view of a conventional flocculant stock solution dilution apparatus 10A. The flocculant stock solution diluting apparatus 10A shown here has a dilution tank 1A. The flocculant stock solution and water are supplied to the dilution tank 1A, and these are stirred by the stirring blade 2A to become the flocculant S. The flocculant S obtained by diluting the flocculant stock solution with water in this manner is sent to a flocking device (not shown) by the agent transfer pump 3A.

  The dilution tank 1A is provided with a level detector (not shown), and the level detector indicates that the amount of the flocculant S in the dilution tank 1A has decreased and its height level has decreased to a predetermined level. When detected, the valve 4A is opened based on the detection signal, and as shown by an arrow A, water is fed into the dilution tank 1A through the valve 4A. At the same time, the stock solution supply pump 5A starts operating, and the flocculant stock solution in the stock solution storage tank 9A is fed into the dilution tank 1A as indicated by an arrow B. In this way, the water and the flocculant stock solution supplied to the dilution tank 1A are stirred by the rotating stirring blade 2. When a predetermined amount of the flocculant stock solution is supplied to the dilution tank 1A, the operation of the stock liquid supply pump 5A is stopped, and the supply of the flocculant stock solution to the dilution tank 1A is stopped. On the other hand, when the level of the flocculant S in the dilution tank 1A is increased and the level detector detects that the level has reached a predetermined height, the valve 4A is closed and water to the dilution tank 1A is closed. Supply is stopped. In this way, one operation of supplying water and the flocculant stock solution is completed. This supply operation is performed each time the height level of the flocculant S in the dilution tank 1A is lowered to a predetermined level.

  As described above, since the predetermined amount of water and the flocculant stock solution are supplied to the dilution tank 1A and stirred during one supply operation, the flocculant having a predetermined concentration is obtained. Thus, the object to be treated can be flocked to a state suitable for solid-liquid separation. Even when water and the flocculant stock solution are supplied to the dilution tank 1A, the flocculant is fed from the dilution tank 1A to the flocking device.

  By the way, in the conventional flocculant stock solution diluting apparatus, the flow rate of water supplied to the dilution tank 1A, that is, the amount of water sent to the dilution tank 1A per unit time is not constant during the above-described supply operation. The ratio of the total amount of water fed into the dilution tank 1A and the total amount of the flocculant stock solution is controlled to be constant while the above-described operation of supplying the water and the flocculant stock solution is performed once. The ratio of the supply amount of water and the supply amount of the flocculant stock solution is not constant at the moment of the supply operation of the agent stock solution. For this reason, when the capacity of the dilution tank 1A is small, the flocculant having a concentration far from the predetermined concentration is sent to the flocking device, and there is a possibility that flocking suitable for solid-liquid separation may not be performed. Therefore, conventionally, a large-capacity dilution tank 1A is used, and the water and the flocculant stock solution fed into the dilution tank 1A are sufficiently stirred by the stirring blade 2A so that the obtained flocculant has a predetermined concentration. Yes.

  However, if the large dilution tank 1A as described above is used, the entire flocculant stock solution diluting apparatus is increased in size and inevitably suffers from a cost increase. In addition, in the case of the conventional flocculant stock solution diluting device, a level detector for detecting the height level of the flocculant in the dilution tank is necessary, which also increases the cost of the flocculant stock solution diluting device. .

JP-A-5-228695 JP 2004-357615 A

  The present invention has been made on the basis of the above-described novel recognition, and an object of the present invention is to provide a flocculant stock solution diluting apparatus that can use a diluting tank smaller than the conventional one and can reduce costs. is there.

  In order to achieve the above object, the present invention provides a dilution tank, a stock solution supply pump for quantitatively supplying the flocculant stock solution to the dilution tank, a water supply pump for quantitatively supplying water to the dilution tank, and the dilution tank. The flocculant stock solution and the stirring means for stirring water, and the flocculant obtained by stirring the flocculant stock solution and water by the stirring means, by the pressurizing action of the stock solution supply pump and the water supply pump, A flocculant stock solution diluting device is proposed which is configured to be pumped to a flocking device (claim 1).

  Further, in the flocculant stock solution diluting apparatus according to claim 1, the dilution tank includes a stock solution inlet into which the flocculant stock solution flows, a water inlet into which water flows in, and a flocculant during the dilution operation of the flocculant stock solution. Except for the agent outlet from which the liquid flows out, it is preferably in a sealed state that is not open to the outside (Claim 2).

  Furthermore, in the flocculant stock solution diluting device according to claim 1 or 2, it is advantageous that the stock solution inlet through which the flocculant stock solution flows into the dilution tank is constituted by pores (claim 3).

  Further, in the flocculant stock solution diluting device according to claim 3, it is advantageous that the diameter of the pore is set to 0.5 to 3 mm (claim 4).

  ADVANTAGE OF THE INVENTION According to this invention, while being able to use a dilution tank smaller than before, the cost of the flocculant stock solution dilution apparatus can be reduced.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a schematic view showing an arrangement state of a flocculant stock solution diluting device 10, a flocking device 11, and a solid-liquid separating device 12. The flocculant stock solution diluting device 10 shown here includes a dilution tank 1, a stock solution storage tank 9 containing the flocculant stock solution, and a stock solution supply pump 6 that feeds the flocculant stock solution in the stock solution storage tank 9 to the dilution tank 1. And a water supply pump 8 for feeding water into the dilution tank 1.

  FIG. 2 is a vertical enlarged sectional view of the dilution tank 1. As shown in this figure, the dilution tank 1 has an upper wall portion 13, a peripheral wall portion 14, and a bottom wall portion 15, and an inner space is partitioned by these wall portions 13, 14, 15. The dilution tank 1 is fixedly supported on a support base 16 fixedly disposed on a mounting surface such as a ground surface or a floor surface.

  The peripheral wall portion 14 of the dilution tank 1 is formed with a raw solution inlet 17 into which the flocculant stock solution flows and a water inlet 19 into which water flows in, respectively, and an agent outlet 18 through which the flocculant flows out on the upper wall portion 13. Is formed. One end side of the stock solution conduit 20 is connected to the stock solution inlet 17, and the other end side of the stock solution conduit 20 is connected to a stock solution discharge port of the stock solution supply pump 6 as shown in FIG. One end side of the water conduit 21 is connected to the water inlet 19, and the other end side of the water conduit 21 is connected to the water discharge port of the water supply pump 8. Further, the agent outlet 18 is connected to the agent inlet of the flocking device 11 via an agent conduit 22.

  A stirring blade 2 is disposed in the lower part of the internal space of the dilution tank 1, and the shaft 7 of the stirring blade 2 extends downward through the bottom wall portion 15 of the dilution tank 1 and is supported by a support base 16. The stirring blade 2 is rotationally driven by the motor 23.

  As the flocking device 11 and the solid-liquid separation device 12 shown in FIG. 1, an appropriate type of device known per se can be adopted. For example, as the solid-liquid separation device 12, the device described in JP-A-5-228695 and JP-A-2004-357615 is used, and the flocking device 11 is also described in JP-A-2004-352615, for example. Can be adopted.

  Various processing objects can be subjected to solid-liquid separation processing by the solid-liquid separator, but here, sludge is subjected to solid-liquid separation. When such a solid-liquid separation operation is performed, both the water supply pump 8 and the stock solution supply pump 6 are operated, and the water fed from the water supply pump 8 flows through the water conduit 21 and enters the internal space of the dilution tank 1 with an arrow X. It is sent as shown in. Similarly, the coagulant stock solution in the stock solution storage tank 9 is sent out by the stock solution supply pump 6, and the coagulant stock solution flows through the stock solution conduit 20 and is sent into the internal space of the dilution tank 1 as indicated by an arrow Y. The flocculant stock solution and water fed into the internal space of the dilution tank 1 are agitated by the agitation blade 2 that is rotationally driven by the motor 23. As described above, in the flocculant stock solution diluting apparatus of this example, the stirring blade 2 provided with the shaft 7 and the motor 23 that rotationally drives the stirrer that stirs the flocculant stock solution and water fed to the dilution tank. Means are configured. Of course, other appropriate types of stirring means may be employed.

  As described above, the flocculant stock solution and water fed into the dilution tank 1 are stirred by the stirring means, whereby the flocculant obtained by diluting the flocculant stock solution with water is obtained. As shown by an arrow Z, the flocculant flows through the agent conduit 22 and is fed into the flocking device 11. On the other hand, sludge is supplied to the flocking device 11 through the conduit 24 shown in FIG. 1, the sludge and the flocculant are stirred, and the sludge is flocked. The sludge is sent to the solid-liquid separator 12, where water is separated from the sludge, the water flows downward as shown by arrow F, and the sludge with reduced water is solidified as shown by arrow G. It is discharged from the liquid separator 12.

  In FIG. 2, illustration of the flocculant stock solution supplied to the dilution tank 1, water, and the flocculant obtained by stirring them is omitted.

Here, a metering pump is used as the stock solution supply pump 6 and the water supply pump 8 shown in FIG. 1, and the stock solution supply pump 6 feeds the flocculant stock solution to the dilution tank 1 in a fixed amount, and the water supply pump 8 is also a dilution tank. A fixed amount of water is supplied to 1. More specifically, the stock solution supply pump 6 supplies the coagulant stock solution with a substantially constant flow rate to the dilution tank 1, and the water supply pump 8 also supplies water with a substantially constant flow rate to the dilution tank 1. When the flow rate of the flocculant stock solution sent to the dilution tank 1 by the stock solution supply pump 6 is mcm ³ / sec and the flow rate of water sent to the dilution tank 1 by the water supply pump 8 is ncm ³ / sec, m and n The value of is always kept almost constant. The ratio m: n of the coagulant stock solution supply amount and the water supply amount per unit time during the supply operation of water and the coagulant stock solution is set to an appropriate value in advance. As a result, the flocculant stock solution and water fed into the dilution tank 1 are stirred with the stirring blade 2 to obtain a predetermined concentration of the flocculant, and the concentration can always be kept substantially constant. For this reason, even if the capacity of the dilution tank is not particularly increased as in the prior art, the flocculant having a predetermined concentration can always be fed into the flocking device 11, and sludge can be flocked to a state suitable for solid-liquid separation. it can. Thus, since the dilution tank 1 can be made small, the manufacturing cost can be kept low, and the entire flocculant stock solution diluting device 10 can be downsized.

  Moreover, in the flocculant stock solution diluting device 10 of this example, the stock solution supply pump 6 and the water supply pump 8 quantitatively supply the flocculant stock solution and water to the dilution tank 1, which is essential in the conventional flocculant stock solution diluting device. The level detector which was the structure becomes unnecessary, and it is possible to reduce the cost of the flocculant stock solution dilution apparatus.

  Furthermore, in the flocculant stock solution diluting apparatus 10 of this example, paying attention to the fact that the flocculant stock solution and water are sent to the dilution tank 1 by the stock solution supply pump 6 and the water supply pump 8, The flocculant in the dilution tank 1 is configured to be fed into the flocking device 11. The flocculant obtained by stirring the flocculant stock solution and water by the stirring means is pumped to the flocking device 11 by the pressurizing action of the stock solution supply pump 6 and the water supply pump 8. More specifically, the diluting tank 1 is other than the stock solution inlet 17 into which the flocculant stock solution flows, the water inlet 19 into which water flows in, and the agent outlet 18 through which the flocculant flows out during the diluting operation of the flocculant stock solution. Is in a sealed state that is not open to the outside. As a result, the pressure applied by the stock solution supply pump 6 and the water supply pump 8 acts on the flocculant in the dilution tank 1, and the flocculant is discharged from the agent outlet 18 and flows through the agent conduit 22 to form a flocking device. 11 is sent. According to this configuration, the agent transfer pump, which is an essential configuration in the conventional flocculant stock solution dilution apparatus, can be omitted.

  At a time other than the diluting operation of the flocculant stock solution, the dilution tank 1 may have a portion that opens to the outside in addition to the stock solution inlet 17, the water inlet 19, and the agent outlet 18. For example, an agent discharge port (not shown) is formed in the bottom wall portion 15 of the dilution tank 1, and the agent discharge port is opened at a time other than during the diluting operation of the flocculant stock solution. The flocculant can be discharged from the agent discharge port to clean the inside of the dilution tank 1. On the other hand, during the diluting operation of the flocculant stock solution, the agent discharge port is closed with a lid, and the dilution tank 1 is hermetically sealed except for the stock solution inlet 17, the water inlet 19, and the agent outlet 18. To be in a state. Thereby, the coagulant | flocculant in the dilution tank 1 can be sent out to the flocking apparatus 11 without trouble by the pressurization effect | action of the stock solution supply pump 6 and the water supply pump 8. FIG.

  By the way, the flocculant stock solution has a property that when the stock solution is supplied to water, the flocculant stock solution gels and the viscosity of the flocculant stock solution increases rapidly. Therefore, as shown in FIG. 5, when a large-diameter stock solution inlet 17 is formed in the peripheral wall portion 14 of the dilution tank 1, and the flocculant stock solution is poured into the water in the dilution tank 1 from this inlet 17, the flocculant The stock solution is gelled, and the region indicated by the arrow C in FIG. 5 is clogged with the gelated flocculant stock solution, and the flocculant stock solution may not flow into the dilution tank 1 from the stock solution inlet 17.

  Therefore, in the flocculant stock solution diluting apparatus 10 of this example, as shown in an enlarged view in FIG. 3, a stock solution inlet 17 through which the flocculant stock solution flows into the dilution tank 1 is formed in the peripheral wall portion 14 of the dilution tank 1. It is constituted by the fine pores 25. The diameter D of the pores 25 is set to 0.5 to 3 mm, preferably 0.5 to 1.5 mm. The flocculant stock solution flows through such pores 25 and flows into the dilution tank 1 from the stock solution inlet 17, and the stock solution and water are stirred by the stirring blade 2. There is no risk of clogging by the gelled flocculant stock solution. The number of the pores 25, that is, the number of the stock solution inlets 17, may be one or plural, and the number is set according to the nature of the flocculant stock solution.

  In the dilution tank 1 shown in FIGS. 2 and 3, the pores 25 are formed directly in the peripheral wall portion 14. However, as shown in FIG. 4, a female screw is formed in the peripheral wall portion 14 of the dilution tank 1. A through hole 26 is formed, and an inlet member 27 having a male screw is screwed into the through hole 26, and the inlet member 27 is detachably fixed to the peripheral wall portion 14. The inlet member 27 is shown in FIG. It is also possible to form pores 25 similar to the above. According to this configuration, a plurality of inlet members 27 having different numbers of pores 25 and their diameters D are prepared, and the inlet member 27 having the pores 25 most suitable for the properties of the flocculant stock solution is prepared. It is possible to select and use it by attaching it to the peripheral wall portion 14.

It is the schematic which showed the arrangement | positioning state of the flocculant stock solution dilution apparatus, the flocking apparatus, and the solid-liquid separation apparatus. It is a vertical expanded sectional view of a dilution tank. It is an expanded sectional view of the part shown by arrow III of FIG. It is sectional drawing similar to FIG. 3 which shows the structure which fixed the inlet member in which the pore was formed to the surrounding wall of a dilution tank so that attachment or detachment was possible. It is sectional drawing explaining the malfunction when the diameter of a stock solution inflow port is large. It is a schematic sectional drawing which shows an example of the conventional flocculant stock solution dilution apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dilution tank 6 Stock solution supply pump 8 Water supply pump 10 Coagulant stock solution dilution device 11 Flocking device 17 Stock solution inlet 18 Agent outlet 19 Water inlet 25 Pore D diameter

Claims (4)

A dilution tank, a stock solution supply pump for quantitatively supplying the flocculant stock solution to the dilution tank, a water supply pump for quantitatively supplying water to the dilution tank, and an agitation for stirring the flocculant stock solution and water fed to the dilution tank And the flocculant obtained by stirring the flocculant stock solution and water by the stirring means is pumped to the flocking device by the pressurizing action of the stock liquid supply pump and the water supply pump. The flocculant stock solution dilution device. The diluting tank is open to the outside except for the stock solution inlet into which the flocculant stock solution flows, the water inlet into which water flows in, and the agent outlet from which the flocculant flows out during the dilution operation of the flocculant stock solution. The apparatus for diluting a flocculant stock solution according to claim 1, wherein the apparatus is in a closed state. The flocculant stock solution diluting device according to claim 1 or 2, wherein the stock solution inlet through which the flocculant stock solution flows into the dilution tank is constituted by pores. The flocculant stock solution diluting device according to claim 3, wherein the pore diameter is set to 0.5 to 3 mm.

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