JP2007296467A - Liquid treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid treatment apparatus which reduces the load applied on a cyclone separator by installing a deposit discharge vessel in the upstream side of the cyclone separator and prevents the separation efficiency of the cyclone separator from being lowered by preventing flocs in the liquid from being finely pulverized. <P>SOLUTION: The liquid treatment apparatus comprises a reaction vessel 2 for causing a raw liquid and a coagulant to react with each other, a deposit discharge vessel 15 for discharging deposits from the liquid taken out of the reaction vessel 2, an inner vortex pump 29 for pumping a floc containing liquid containing flocs, which do not precipitate, in the vessel 15 and the cyclone separator 30 for separating the flocs from the floc containing liquid by turning the floc containing liquid discharged from the inner vortex pump 29. The inner vortex pump 29 is a pump having an inner side vortex blade provided on an inner side disc arranged on the side on which a main body suction port is provided in a pump chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid processing apparatus equipped with a cyclone separator.

When supplying the stock solution containing pollutants to the cyclone separator with a pump, the flocculant is mixed in the stock solution to aggregate the pollutants, so that the cyclone separator can be easily separated from the pollutants. (For example, refer to Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 10-180741 (page 3, FIG. 1) Japanese Patent Laying-Open No. 2005-185874 (page 4, FIG. 1)

  Since the liquid in which the pollutants are agglomerated due to the presence of the flocculant is likely to precipitate, it is possible to provide a sediment discharge tank before supplying it to the cyclone separator, and to discharge the precipitate to the outside from this precipitate discharge tank. On the other hand, the pump for supplying the liquid from the sediment discharge tank to the cyclone separator does not settle in the sediment discharge tank, but flocks floating in the liquid are connected. Since the floc in this state is broken and dispersed finely by the impeller, there is a problem that the centrifugal separation action in the cyclone separator is difficult to work and the separation efficiency is lowered.

  The present invention has been made in view of the above points, and a sediment discharge tank is disposed on the upstream side of the cyclone separator to reduce the load on the cyclone separator, and from the precipitate discharge tank to the cyclone separator. It is an object of the present invention to provide a liquid processing apparatus capable of preventing a reduction in separation efficiency in a cyclone separator by preventing a pump supplying liquid from miniaturizing flocs in the liquid.

  The invention described in claim 1 includes a reaction tank for reacting the stock solution and the flocculant, a precipitate discharge tank for discharging precipitates from the liquid taken out from the reaction tank, and a deposit discharge tank in the precipitate discharge tank. The vortex pump includes a vortex pump that pumps the floc mixed liquid including the flock that does not settle, and a cyclone separator that rotates the floc mixed liquid discharged from the vortex pump to separate the floc from the liquid. A pump body having a pump chamber in which a portion bulges from the periphery toward the center, a main body inlet opening at one side center of the pump body corresponding to the bulging top of the pump chamber, and an outer periphery of the pump body A main body discharge port that is open at the front, a rotary shaft that is inserted into the center of the pump chamber from the other central portion of the pump body located on the front side of the main body suction port, and a main body suction port within the pump chamber The disk-shaped outer disk arranged on the opposite side and rotated by the rotating shaft, and the main body inlet corresponding to the central part located farthest from the outer side disk arranged on the side provided with the main body inlet in the pump chamber An inner side disk which has a suction opening and is inclined from the suction opening to the outermost edge closest to the outer side disk and is rotated integrally with the outer side disk, and an outer surface of the inner side disk facing the outer side disk. It is a liquid processing apparatus provided with the inner side blade | wing which is provided and transfers a liquid over the periphery from a suction opening.

  According to a second aspect of the present invention, there is provided the liquid processing apparatus according to the first aspect, wherein a liquid storage tank for storing the liquid from which the floc has been removed by the cyclone separator and a liquid level of the floc mixed liquid in the sediment discharge tank are set. When the liquid level sensor to be detected and the liquid level in the sediment discharge tank detected by the liquid level sensor are below the set value, the liquid in the liquid storage tank is replaced with the floc mixed liquid in the sediment discharge tank and vortexed. And a switching valve to be sucked into the pump.

  According to the first aspect of the present invention, the sediment is discharged from the liquid taken out from the reaction tank for reacting the stock solution and the flocculant into the precipitate discharge tank, and the non-precipitated floc in the precipitate discharge tank Since the floc mixed liquid containing slag is supplied to the cyclone separator by a vortex pump and floc is separated from the liquid, the burden on the cyclone separator can be reduced by the sediment discharge tank, and the cyclone separator can be removed from the precipitate discharge tank. The vortex pump that supplies the liquid to the inner side of the inner disk located on the side provided with the main body suction port in the pump chamber is located on the inner side of the surface facing the outer side disk disposed on the side facing the main body suction port. The floc in the floc mixed liquid pumped from the sediment discharge tank is supplied to the cyclone separator without being refined by the inner vortex pump structure with blades. Since kill, floc can be efficiently separated from the liquid in the cyclone separator.

  According to the invention described in claim 2, when the liquid level in the sediment discharge tank detected by the liquid level sensor falls below the set value, the flock is mixed in the sediment discharge tank by the switching valve. Since the liquid in the liquid storage tank is sucked into the vortex pump instead of the liquid, the vortex pump and the cyclone separator can always be operated without being stopped, so that it is possible to prevent a decrease in capacity when starting the vortex pump and the cyclone separator.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 6 and another embodiment shown in FIGS.

  1 to 4 show a liquid processing apparatus, for example, a stock solution tank 1 for storing a stock solution A such as polluted water generated at a construction site, and a reaction tank 2 for reacting the stock solution A and a flocculant are a pump 3 and a valve. 4 and a pipe 6 with a flow meter 5 interposed therebetween. Since the liquid level sensor 7 is disposed on the stock solution tank 1, the liquid level sensor 7 detects the level of the stock solution A and controls the start and stop of the pump 3.

  Inside the reaction tank 2, a plurality of reaction chambers 10a and 10b are defined by a partition plate 9 having a liquid passage port 8 at the bottom, and stirring blades 12a rotated by motors 11a and 11b are provided in the reaction chambers 10a and 10b. , 12b are respectively inserted, and a flocculant charging machine 13 for charging a predetermined amount of the flocculant is installed in the upstream reaction chamber 10a. The flocculant is a floc that aggregates contaminants in the stock solution to facilitate precipitation, or can be continuously centrifuged without being precipitated. At the upper part of the reaction chamber 10b on the downstream side, an outflow port 14 is provided through which a liquid in which the pollutant is agglomerated by the aggregating agent flows out.

  A sediment discharge tank 15 is installed below the outlet 14 of the reaction tank 2. The sediment discharge tank 15 is divided into a primary precipitation chamber 17a and a secondary precipitation chamber 17b by an overflow plate 16, and a reaction tank is provided inside the primary precipitation chamber 17a and the secondary precipitation chamber 17b. A sediment discharge conveyor 18 is installed to extract the sediment out of the liquid extracted from 2. Above the primary sedimentation chamber 17a of the sediment discharge tank 15, a liquid level sensor 19 for detecting the liquid level B of the floc mixed liquid in the primary sedimentation chamber 17a is disposed, and this liquid level sensor 19 is controlled. Connected to panel 20.

  As shown in FIG. 4, the sediment discharge conveyor 18 is provided with an inclined side surface portion 15b obliquely upward from one end of the bottom surface portion 15a of the precipitate discharge tank 15, and an opening 21 is formed at the upper end of the inclined side surface portion 15b. An endless belt provided in the primary sedimentation chamber 17a and the secondary sedimentation chamber 17b along the oblique side surface portion 15b and the tank bottom surface portion 15a from the roller 22 on the opening 21 to the roller 23 on the other end. 24a and 24b are wound, and these endless belts 24a and 24b are provided with irregularities. Then, by driving the roller 22, the endless belts 24a, 24b are moved in the direction of the arrows shown in the figure, and the precipitates on the endless belts 24a, 24b are moved along with the unevenness and swirled on the opening 21. The precipitate dropped through is accommodated in a moving container 25 disposed below the opening 21.

  Returning to FIG. 1, a liquid storage tank 26 is integrally installed on one side of the sediment discharge tank 15, and a pipe 27 a inserted into the primary precipitation chamber 17 a and the liquid storage tank 26 of the sediment discharge tank 15. 27b are connected to a suction port of an inner vortex pump 29 as a vortex pump through an electromagnetic switching valve 28. The switching valve 28 is controlled by the control panel 20 that has received the detection signal of the liquid level sensor 19, and when the liquid level in the sediment discharge tank 15 detected by the liquid level sensor 19 is below the set value, the liquid storage Switching control is performed so that the liquid in the tank 26 is replaced with the floc mixed liquid in the sediment discharge tank 15 and sucked into the inner vortex pump 29.

  The inner vortex pump 29 is driven by a motor 29m as shown in FIG. 2 and FIG. 4, and pumps up a flock-containing liquid mainly containing a flock that does not settle in the sediment discharge tank 15 by the operation of the switching valve 28. In addition, the discharge port of the inner vortex pump 29 is connected to a cyclone separator 30 for rotating the floc mixed liquid to separate the floc from the liquid. This cyclone separator 30 centrifuges the floc and the liquid by swirling the floc mixed liquid introduced into the outer cylinder 30a from the introduction pipe 30b connected in the tangential direction of the outer cylinder 30a. They are combined and settled downward, and are discharged to the secondary sedimentation chamber 17b of the sediment discharge tank 15 via the pipe 30c, and the clean liquid is taken out to the pipe 30e via the inner cylinder 30d at the center.

  The liquid storage tank 26 stores a clean liquid from which flocs have been removed by the cyclone separator 30 through a filter device 26f, and this filter device 26f has a cloth filter installed in a porous rectangular tube casing. The clean liquid in the liquid storage tank 26 is pumped up by the pump 26p and reused.

  5 and 6 show an inner vortex pump 29, and a pump chamber 32 having one side portion bulging from the periphery toward the center is provided inside the pump body 31. FIG. A main body suction port 33 is opened at one side center of the pump main body 31 corresponding to the bulging top of the pump chamber 32. A flange portion 34 for connecting to an external suction pipe (not shown) is provided around the main body suction port 33.

  A main body discharge port 35 is opened in the tangential direction on the outer peripheral portion of the pump main body 31. Around the main body discharge port 35, a flange portion 36 for connecting to an external discharge pipe (not shown) is provided. A rotating shaft 37 driven by a motor 29m is inserted from the other side central portion of the pump main body 31 located on the front side of the main body suction port 33 to the central portion of the pump chamber 32.

  A flat outer disk 38 that is rotated by a rotating shaft 37 is disposed on the side facing the main body suction port 33 in the pump chamber 32. A spherical convex portion 39 is provided at a central portion of the outer side disk 38 facing the main body suction port 33. An umbrella-like inner disk 41 is disposed on the side of the pump chamber 32 where the main body suction port 33 is provided.

  The inner side disk 41 has a suction opening 42 corresponding to the main body suction port 33 at the center farthest from the outer side disk 38, and is inclined from the suction opening 42 to the peripheral edge closest to the outer side disk 38. The outer disk 38 and the plurality of connecting members 43 are integrally formed, and are rotated integrally by the rotating shaft 37.

  Inner side vortex blades 44 serving as a plurality of inner side blades that transfer liquid from the suction opening 42 in the central portion to the periphery are provided on the surface of the inner side disk 41 that faces the outer side disk 38. These inner side vortex blades 44 are provided radially in the radial direction from the suction opening 42 at the center of the inner side disk 41 as shown in FIG. In this way, the inner vortex pump 29 is configured.

  Then, the pumping principle of the inner vortex pump 29 is that when the outer side disk 38 is rotated by the rotating shaft 37 and the inner side disk 41 provided inside when the flow is bent is rotated via the connecting member 43, Due to the action of the inner vortex blades 44 with the liquid, centrifugal force acts on the liquid, and the liquid in the center of the pump chamber 32 and the floc F in the liquid are located between the outer disk 38 and the inner disk 41. It is transferred to the main body discharge port 35 through the liquid passage and discharged from the main body discharge port 35 to an external discharge pipe. The liquid is sucked into the central portion of the pump chamber 32 from the external suction pipe through the main body suction port 33 and the suction opening 42.

  In such a liquid flow, the inner vortex pump 29 in which the inner vortex blades 44 are arranged in the liquid flow, the energy transfer effect to the liquid compared to a vortex pump without blades (not shown) Compared with the case where the outer side disk 38 is provided with vortex blades, the floc F having straight advanceability flowing from the main body suction port 33 is less likely to hit the inner side vortex blades 44, so that it is fragile and fragile. F can be kept more nearly complete.

  Further, the inner side disk 41 is not parallel to the disk-shaped outer side disk 38, and has a suction opening 42 corresponding to the main body suction port 33 at the center farthest from the outer side disk 38. Since it is formed in an inclined shape from the opening 42 to the peripheral edge closest to the outer side disk 38, the passage cross-sectional area at the suction part (curved part) between the outer side disk 38 and the inner side disk 41 is increased. The speed of the flow at the suction portion is reduced, the interference between the floc F and the disks 38 and 41 and the inner vortex blade 44 is small, and the inner disk 41 is provided parallel to the outer disk 38. In comparison, the fragile and fragile floc F can be kept more nearly complete.

  Next, the function and effect of the embodiment shown in FIGS. 1 to 6 will be described.

  The stock solution pumped from the stock solution tank 1 by the pump 3 and the flocculant fed from the flocculant charging machine 13 are supplied into the reaction tank 2 and are stirred with the stirring blades 12a and 12b, and the pollutants in the stock solution And the liquid is taken out from the reaction tank 2 to the primary precipitation chamber 17a of the precipitate discharge tank 15. In the sediment discharge tank 15, aggregates formed by agglomeration of pollutants having relatively large particles settle in the primary sedimentation chamber 17 a due to their own weight, and are deposited on the endless belt 24 a of the sediment discharge conveyor 18. Since the precipitation occurs, the endless belt 24a is driven to take out the precipitate from the liquid and collect it in the moving container 25 through the opening 21.

  On the other hand, flocs produced by agglomeration of fine particles of pollutants do not immediately precipitate in the sediment discharge tank 15. Therefore, the floc-containing liquid containing the flocs is pumped up by the inner vortex pump 29 and is extracted from the cyclone separator 30. And the liquid and floc are separated in the cyclone separator 30.

  The floc condensed in the cyclone separator 30 is returned from the lower part of the cyclone separator 30 to the secondary sedimentation chamber 17b of the sediment discharge tank 15, and settles in the secondary sedimentation chamber 17b to precipitate precipitation conveyor. Since it settles on the 18 endless belts 24b, it is taken out and collected by this endless belt 24b in the same manner as the primary sedimentation chamber 17a.

  On the other hand, the clean liquid from which the floc has been removed in the cyclone separator 30 is supplied to the liquid storage tank 26 via the pipe 30e and the filter device 26f, and is stored therein.

  The liquid level sensor 19 detects the liquid level B in the sediment discharge tank 15, and when the liquid level B drops below a set value, the control panel 20 controls the switching valve 28 to store it. By sucking the liquid in the liquid tank 26 into the inner vortex pump 29, the liquid level B in the sediment discharge tank 15 is prevented from lowering, and the inner vortex pump 29 and the cyclone separator 30 are continuously operated and stopped. Do not let it.

  In the inner vortex pump 29, the inner side vortex blade 44 is arranged on the inner side disk 41 located on the main body suction port 33 side, so that the straight flock F flowing from the main body suction port 33 hits the inner side vortex blade 44. In addition, the passage cross-sectional area at the suction part (bent part) between the outer side disk 38 and the inner side disk 41 is the largest, and the speed of the flow at this suction part is reduced. Interference with the disks 38 and 41 and the inner side vortex blades 44 is reduced, so compared to the case where the outer side disk 38 is provided with vortex blades or the case where the inner side disk 41 is provided parallel to the outer side disk 38, The fragile and fragile Flock F is also transported while maintaining a more nearly complete shape.

  In this way, the sediment is discharged from the reaction tank 2 that reacts the stock solution and the flocculant to the precipitate discharge tank 15 by the endless belt 24a of the precipitate discharge conveyor 18, and this precipitate discharge tank 15 The floc mixed liquid containing flocs that do not precipitate is supplied to the cyclone separator 30 by the inner vortex pump 29 and the floc is separated from the liquid, so the burden on the cyclone separator 30 can be reduced by the sediment discharge tank 15 The inner vortex pump 29 for supplying the liquid from the sediment discharge tank 15 to the cyclone separator 30 has a main body suction port in the inner disk 41 disposed on the side where the main body suction port 33 is provided in the pump chamber 32. Since the inner vortex pump structure is provided with the inner vortex blade 44 on the surface facing the outer disk 38 disposed on the side opposite to the outer disk 33, the pump is pumped from the sediment discharge tank 15. Since the flocs in the raised floc-mixed liquid can be supplied to the cyclone separator 30 while being maintained in a continuous state without being broken and refined, the cyclone separator 30 can efficiently separate flocs from the liquid.

  Further, when the liquid level B in the sediment discharge tank 15 detected by the liquid level sensor 19 drops below the set value, the changeover valve 28 replaces the floc mixed liquid in the sediment discharge tank 15 with the change. Since the liquid in the liquid tank 26 is sucked into the inner vortex pump 29, the inner vortex pump 29 and the cyclone separator 30 can always be operated without being stopped. Can be prevented.

  Next, another embodiment of the inner vortex pump 29 shown in FIGS. 7 to 9 will be described. 5 and 6 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 7 shows a modification of the blades of the inner vortex pump 29. A plurality of inner vortex blades 44 are provided obliquely from the suction opening 42 in the center of the inner disk 41 in the direction opposite to the rotational direction from the radial direction. ing. FIG. 8 shows another blade variation of the inner vortex pump 29, in which a plurality of inner vortex blades 44 are displaced from the suction opening 42 in the center of the inner disk 41 in the direction opposite to the rotational direction from the radial direction. It is provided in an arc shape.

  The inner side vortex blade 44 shown in FIG. 7 is more suitable than the inner side vortex blade 44 shown in FIG. 7 than the inner side vortex blade 44 shown in FIG. The blades 44 can further reduce the resistance of the liquid acting on the inner vortex blades 44, and can keep the fragile and fragile floc F closer to a complete shape.

  FIG. 9 shows another embodiment of the inner vortex pump 29, and the pump chamber is formed in the pump body 31 so that the surrounding space with respect to the central axis is generally inclined from the peripheral edge toward the center. 32 is provided. Similarly, the outer side disk 38 is bulged and formed in an umbrella shape so as to be entirely inclined from the periphery toward the center, and a bulging top portion is disposed at a position facing the main body suction port 33. Further, the inner disk 41 is also bulged and formed in an umbrella shape so as to incline as a whole from the periphery toward the center, and a suction opening 42 at the bulging top is disposed at a position corresponding to the main body suction port 33. .

  Then, both the outer side disk 38 and the inner side disk 41 are formed to bulge so as to be entirely inclined from the peripheral edge toward the center, and the suction opening 42 of the bulging top portion is arranged at a position with respect to the main body suction port 33. That is, since the passage direction between the disks 38 and 41 is obtuse with respect to the inflow direction from the main body suction port 33, the flock F can be smoothly redirected at the suction portion (curved portion) where the flow direction changes, The fragile and fragile Flock F can be kept more nearly complete.

  INDUSTRIAL APPLICABILITY The present invention can be used for purification treatment of polluted water generated at a construction site or the like.

It is sectional drawing which shows one Embodiment of the liquid processing apparatus which concerns on this invention. It is a top view of a liquid processing apparatus same as the above. It is a front view of a liquid processing apparatus same as the above. It is a side view of a liquid processing apparatus same as the above. It is sectional drawing of the axial direction which shows one Embodiment of the inner vortex pump in a liquid processing apparatus same as the above. It is sectional drawing of the radial direction of an inner vortex pump same as the above. It is sectional drawing of the radial direction which shows the blade | wing modification of an inner vortex pump same as the above. It is sectional drawing of the radial direction which shows another blade | wing modification of an inner vortex pump same as the above. It is sectional drawing of the axial direction which shows other embodiment of an inner vortex pump same as the above.

Explanation of symbols

2 reaction tank
15 Precipitate discharge tank
19 Liquid level sensor
26 Liquid storage tank
28 selector valve
29 Inner vortex pump as vortex pump
30 cyclone separator
31 Pump body
32 Pump room
33 Main unit inlet
35 Body outlet
37 axis of rotation
38 Outer disk
41 Inner disc
42 Suction opening
44 Inner side vortex blade as inner side blade

Claims (2)

A reaction vessel for reacting the stock solution and the flocculant;
A sediment discharge tank for discharging the precipitate from the liquid taken out from the reaction tank;
A vortex pump for pumping a floc-containing liquid containing non-precipitating floc in the precipitate discharge tank;
A cyclone separator for rotating the floc mixed liquid discharged from the vortex pump to separate the floc from the liquid,
The vortex pump
A pump body having a pump chamber in which one side portion is formed to bulge from the periphery toward the center;
A main body suction port opened at one side center of the pump main body corresponding to the bulging top of the pump chamber;
A main body discharge port opened in the outer periphery of the pump main body,
A rotating shaft inserted into the central portion of the pump chamber from the other central portion of the pump body located on the front side of the main body suction port;
A disk-shaped outer side disk disposed on the side facing the main body inlet in the pump chamber and rotated by a rotating shaft;
Located in the pump chamber on the side where the main body suction port is provided and has a suction opening corresponding to the main body suction port at the center farthest from the outer side disk, and inclined from the suction opening to the peripheral edge closest to the outer side disk An inner disk that is formed in the outer disk and is rotated together with the outer disk,
A liquid processing apparatus comprising: an inner side blade provided on a surface of the inner side disk facing the outer side disk and configured to transfer liquid from the suction opening to the periphery. A liquid storage tank for storing liquid from which flocs have been removed by a cyclone separator;
A liquid level sensor for detecting the liquid level of the floc mixed liquid in the sediment discharge tank;
When the liquid level in the sediment discharge tank detected by the liquid level sensor is lower than the set value, a switching valve that causes the vortex pump to suck the liquid in the storage tank into the flock mixed liquid in the sediment discharge tank The liquid processing apparatus according to claim 1, comprising:

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