JP5250921B1 - Pressurized floating scum separation treatment device - Google Patents

Abstract

[PROBLEMS] By removing the scum that floats in the levitation separation tank by means of compression and dewatering while dewatering, it is possible to transport the scum after discharge while saving energy and simplifying the separation process of scum and moisture at the transport destination as much as possible. There is provided a pressure levitation type scum separation processing apparatus adapted to be able to be realized.
The collected scum-containing sewage is spouted into the levitation separation tank 2 together with water generated by a pressurized air dissolving device 45 to levitate the scum into the levitation separation tank 2, and the cradle screw 23 and the scum guide 19 The scum that floats on the screw conveyor 17 having the attached scum intake 20 and the rotary screw rotation drive means 40 is discharged.
[Selection] Figure 1

Description

  The present invention relates to a pressurized floating scum separation processing apparatus.

  When the collected scum-containing sewage is introduced into the levitation separation tank, the scum that has been levitated will be discharged from the top by spraying under reduced pressure with water in which air is dissolved by pressurization and promoting scum ascent. The pressurized levitation method is a known technique. As a technique related to such a technique, there is a technique disclosed in Patent Document 1.

Japanese Patent No. 4238297

The technique according to Patent Document 1 includes a scraper that scrapes the floated scum toward a scum discharge trough provided in a pressurized flotation concentration tank (flotation separation tank), an upper tank wall of the pressurized flotation concentration tank, and The scum discharged by the scraper having a curved surface formed so that the center position of the curve is located on the pressurized flotation concentration tank side and a rotating shaft and blades on the rotating shaft is discharged from the scum. A discharger provided near the curved surface for discharging to the trough, and a drive source having a function of rotating the rotation shaft of the discharger and adjusting the number of rotations thereof.
This scum pressurized levitation concentrator is designed to smoothly convey the scum that has been levitated to the scum treatment facility far away from the scum that has been discharged from the pressurized levitation and concentration tank. The means consists of a scraper, which is a chain with a scraping plate protruding from the outer periphery, and a discharger with a scraping blade that moves along a curved surface and rotates around the rotation axis. The scum from the discharger is discharged into the scum. Therefore, since the scum that floated is discharged with sufficient moisture, wasteful power is consumed for transport to the scum treatment facility, and the scum and moisture are transported to the transport destination. And it will be necessary to separate them again.

  The present invention is intended to solve these problems. The scum that floats in the levitation separation tank is raked and discharged while draining by a compression action, thereby enabling transportation after discharge while saving energy and transport destination. It is an object of the present invention to provide a pressure levitation type scum separation processing apparatus capable of simplifying the separation process of scum and moisture in the process as much as possible.

In order to achieve the above-mentioned object, the invention according to claim 1 is configured such that the collected scum-containing sewage is jetted into a floating separation tank together with water generated by a pressurized air dissolving device that dissolves air by pressurization. The scum is floated in the floating separation tank, and the floated scum is discharged by a scum discharge device. The scum discharge device includes a lifting screw, a casing with a scum intake, and a rotary drive means for the lifting screw The casing is installed in an inclined manner in the floating separation tank, and the lower part in the inclined direction is supported by the floating separation tank, while the upper part in the inclined direction is located outside the floating separation tank higher than the water surface and is formed in the casing. The discharged scum can be discharged through the discharged outlet, and the scum intake opening is located below the lower part of the casing in the inclined direction. In the pressurized levitation scum separation processing device that is configured to be able to take in the scum that is established and floats through the scum guide with the slope guide, at least the peripheral portion of the lifting screw corresponding to the scum intake port A scooping ridge projecting upward in the tilt direction is provided .

As described above, according to the first aspect of the present invention, the collected scum-containing sewage is jetted into the floating separation tank together with water generated by a pressurized air dissolving device that dissolves air by pressurization, and the scum is floated in the floating separation tank. And the scum discharging device is configured to discharge the scum that has floated in the scum by a scum discharging device, the scum discharging device has a lifting screw, a casing with a scum intake, and a rotation driving means for the lifting screw, The casing is installed in an inclined manner in the floating separation tank, and the lower part in the inclined direction is supported by the floating separation tank, while the upper part in the inclined direction is positioned outside the floating separation tank higher than the water surface and is raked up through a discharge port formed in the casing. The scum can be discharged, and the scum intake port is opened and floated around the lower part of the casing in the inclined direction. In the pressurized flotation type scum separation processing apparatus configured to be able to take in the coming scum through the scum guide with a slope guide, at least the peripheral portion of the lifting screw corresponding to the scum intake port is directed upward in the inclination direction. It is characterized by a ridge that protrudes toward the surface, so that the scum that floats in the levitation separation tank is raked and discharged while dewatering by compression action, so that transportation after discharge can be saved In addition, it is possible to provide a pressure-flotation type scum separation processing apparatus that is capable of simplifying the separation process of scum and moisture at the conveyance destination as much as possible. In particular, the rotating scooping ridge makes sure that the scum that has been lifted is scooped up reliably, thereby increasing the amount of fisting action, eliminating mistakes in scooping, and reducing the scum dehydrating action due to the compression action. In addition, the presence of the scooping ridges also reinforces the screw conveyor.

The schematic diagram which shows one Embodiment of the pressurization floating type scum separation processing apparatus of this invention. Sectional drawing which expands and shows the A section of FIG. The expanded sectional view which follows the III-III line of FIG. The disassembled perspective view which shows the detail of the scum guide of FIG. 1 in relation to a screw conveyor. Sectional drawing which shows other embodiment of a deep-fried protrusion. Sectional drawing which expands and shows the B section of FIG. VII-VII line sectional drawing of FIG. The schematic cross section which shows other embodiment about an air dissolution tank.

  Hereinafter, an embodiment of a pressure levitation type scum separation processing apparatus according to the present invention will be described with reference to FIGS. In the following description, the floating separator and the pressurized water generator are based on the use of a metal material, particularly stainless steel, but are not limited thereto.

  In FIG. 1, reference numeral 1 denotes a levitation separation apparatus, which includes a levitation separation tank 2 that is open from the top and is a rectangular tank as viewed from above. The floating separation tank 2 has a tank body 3 and a separation tank 5 via a partition wall 4, and the sewage 6 and the separated water 7 are stored up to level H in the tank body 3 and the separation tank 5. A communication pipe 8 is a pipe that connects the tank body 3 and the separation tank 5, and purified water having a filter 9 at the front and rear ends is introduced into the separation tank 5 as separated water 7. An overflow port 10 determines the water level H. The water level H may be adjusted up and down by a movable weir. The separation water 7 in the separation tank 5 is discharged to the outside through the overflow port 10, while the separation water 7 is drawn from the bottom of the separation tank 5 through the water supply pipe 11 by the operation of the water supply pump 12, which will be described later. The air is introduced into the air dissolving device 45.

In the lower part of the tank body 3, a single supply pipe 14 or a plurality of supply pipes 14 provided with a plurality of nozzles 13 that also serve as pressure reducing valves are arranged so that the axial center is directed in the front-rear direction of the tank body 3. The supply pipe 14 may be provided with a pressure reducing valve.
A screw conveyor 17 that is a scum discharge device is fixedly installed at an upper portion of the floating separation tank 2 including the tank body 3 and the separation tank 5 in an inclined state of about 15 degrees. This inclination angle may be changed to 20 degrees, 30 degrees, and so on. The screw conveyor 17 includes a cylindrical casing 18 having an inner diameter of about 300 mm, and a lower end (tail side) in the inclination direction of the casing 18 is closed and the front side of the tank body 3 (left side in FIG. 1). On the other hand, one upper end (head side) in the inclined direction is also closed and fixed in a state of protruding to the rear side (right side in FIG. 1) of the floating separation tank 2.

  Reference numeral 20 denotes a scum intake port, which is formed as a rectangular opening when viewed from below at a lower peripheral position away from the lower end of the casing 18 in the inclination direction, and the scum S that floats on the sewage 6. It is provided at a position suitable for taking in. A screw shaft (or pipe) 22 passes through the center of the casing 18 and both ends thereof are rotatably supported by bearings, and a screw screw 23 is provided on the outer periphery of the screw shaft 22. The lifting screw 23 includes a screw main body 23a having a spiral plate, and the main body 23a is formed so that the upper end is about 70 cm away from the upper end of the casing 18.

A scooping ridge 23b that protrudes upward in the inclined direction is integrally provided as a spiral strip at the peripheral edge of the main body 23a extending over a length L that is equal to or longer than the length corresponding to the scum inlet 20. . As shown in FIG. 3, the protrusion amount W1 of the scooping ridge 23b is about 50 mm when the outer diameter D of the screw body 23a is 300 mm, but may be about 75 mm as in W2, or 100 mm. It may protrude greatly from front to back. The scooping ridges 23b may be welded or fixed to the periphery of the screw body 23a, as shown in the right column of FIG. Further, as shown in FIG. 5 , the scooping ridges 23b may be round rods, round pipes or square pipes and welded together. Furthermore, although the scooping ridge 23b is provided in a part limited to L, it may be provided over the entire length of the screw body 23a.

  Here, reference numeral 19 in FIGS. 1, 2 and 4 denotes a scum guide. If the tank body 3 of the levitation separation tank 2 is left open so that the entire surface of the tank becomes a water surface and the sewage S is floated on the scum S, Incorporation of the scum S into the inlet 20 becomes passive. Therefore, the scum guide 19 is provided so that the scum S floating along with the fine bubbles from the sewage 6 can be reliably and positively taken into the scum inlet 20.

  As shown in detail in FIG. 4, the scum guide 19 is formed in an inverted quadrangular pyramid shape by front and rear slope guides a and b and left and right slope guides c. It is fixed by touching. A square communication tube e is integrally provided at the center of the upper part of these four inclined guides a to c. The inclined surface guide c is a straight plate that is slanted, but a curved plate material may be used.

The communication tube e is a vertically penetrating tube portion having left and right inclined plate-like opposing walls f and front and rear walls g and h, and the opposing wall f takes in the scum of the casing 18 of FIG. While being configured to be welded along the outer edge of the port 20, the front wall g of the front and rear is low, the rear h is high, and an arcuate fitting receiving groove i shorter than a semicircle on the upper side, By forming j, the outer edge portions of the front and rear of the scum inlet 20 are fitted into these fitting receiving grooves i and j and are welded. In this way, the communication tube e is fitted to the outer edge of the scum inlet 20, so that the scum S that has risen is taken in without being clogged in the middle. 1 and 2 indicate the water surface of the sewage 6, and the water surface H is approximately the height of the groove bottom of the fitting receiving groove j of the communication tube e.

  As shown in the upper right of FIG. 4, the left and right walls f may be provided with mounting flanges k so as to be detachable from the casing 18 by the fasteners m. Installation work is simplified and maintenance is convenient. A mounting flange having a curved plate shape along the curved edges of the front and rear walls g, h may be provided so as to be removable.

As shown in FIGS. 6 and 7, a compression receiving plate 26 is provided around the upper portion of the screw shaft 22 in the inclination direction. The compression receiving plate 26 includes a disk-shaped receiving plate 27 having an outer diameter slightly smaller than the inner diameter of the casing 18 as a main body, and is made of a cylindrical resin that is easily slidable on a central boss 28 provided at the center of the receiving plate 27. The inner slider 29 is provided so that the screw shaft 22 can be moved forward and backward in the axial direction, and the outer periphery of the receiving plate 27 is provided with an outer slider 30 made of a cylindrical resin which is slidable so as to be movable forward and backward along the inner periphery of the casing 18. It is. A plurality of guide pipes 31 project from the back portion of the receiving plate 27, and guide bars 32 projecting from the end face side of the casing 18 are slidably fitted into the guide pipes 31. The guide bar 32 is provided with a repulsion spring 33 as a resilient means so that a repulsive force is constantly applied to the compression receiving plate 26 so as to apply a compression action to the scum that has been lifted up by the lifting screw 23. .

35 is a discharge port, which is opened around the upper lower part of the casing 18 in the inclination direction, and the compression receiving plate 26 at the time of return is positioned at a lower position in the inclination direction than the lower opening edge of the discharge port 35 in the inclination direction. . The discharge port 35 is provided with a chute 38 for dropping compressed scum into a container 37 on the transport conveyor 36. Reference numeral 40 in FIG. 1 denotes a driving source (driving means) which is a reduction motor, which rotates the screw shaft 22 in the direction of the arrow in FIG .
In addition, as shown in the upper right of FIG. 1, what provided the lifting screw 23 to the upper end of the inclination direction is not excluded here.
Further, the scum from the chute 38 may be directly conveyed by a conveyor such as a belt, or may be collected and conveyed in a container 37 that can be moved regardless of the conveyor.

  In FIG. 1, reference numeral 45 denotes a pressurized air dissolving apparatus including a plurality of air dissolving tanks 46. The water supply pipe 11 communicates with each air dissolution tank 46 through a parallel inlet pipe 47 and is connected to the supply pipe 14 through an outlet pipe 48 and a junction pipe 49 that integrates the outlet pipe 48. ing. Automatic valves 50 and 51 are provided on the entry side and the exit side of each air dissolution tank 46. Although two air dissolution tanks 46 are provided, three or more air dissolution tanks 46 may be provided to adapt to the amount of scum-containing sewage collected later.

  In the air dissolution tank 46, an air nozzle 53 is provided on the lower side of the air dissolution tank 46 so that the air dissolves in the internal water while the air circulates around the circulation partition plate 54. The air nozzle 53 is connected to a blower (air supply means) 56 through each air pipe 55. The blower 56 can be replaced with a compressor. Each of the air pipes 55 is provided with an air automatic valve 57 in a controllable manner.

  Reference numeral 60 denotes a sewage receiving tank into which scum-containing sewage 61 collected from a sedimentation basin or a concentration tank is introduced. The receiving tank 60 and the junction pipe 49 are connected by a sewage supply pipe 62, and a sewage pump 63 is provided on the pipe.

The operation of this pressurized floating scum separation processing device will be described. The water supply pump 12 is operated to supply water to one air dissolution tank 46 using the separated water 7 in the separation tank 5. The inflow into the air dissolution tank 46 is made by opening the inlet side automatic valve 50 (air or electrically operated type). Next, the automatic valve 57 corresponding to one of the air dissolution tanks 46 is opened, and the blower 56 or the compressor is operated so that the air nozzle 53 injects the atomized air into the air dissolution tank 46, thereby causing one of the air dissolution tanks. The fine air is dissolved in the internal water by increasing the pressure in 46 and using the internal water as a circulating flow.
Thereafter, when the sewage pump 63 is operated to send the scum-containing sewage 61 to the sewage supply pipe 62, the outlet automatic valve 51 corresponding to one of the air dissolution tanks 46 is opened at the same time, thereby dissolving the scum-containing sewage and air. The pressurized water is mixed, and the mixture is fed into the main body tank 3 of the floating separation tank 2 from the junction pipe 49 and the supply pipe 14 through the nozzles 13.

  The fine bubbles from the mixed water that has been sent in will float with scum. The floated scum S is taken in and scraped up through the scum inlet 20, but the scum S is taken into the scum inlet 20 smoothly and reliably by the slope guide by the scum guide 19. The scum S from the scum inlet 20 is surely scooped up by the scooping function by the scooping ridge 23b attached to the lifting screw 23. The scooped scum S pushes up the compression receiving plate 26 against the repulsion spring 33 and dehydrates it while moving it from the position of the compression receiving plate 26 indicated by the phantom line in FIG. Further, the compression receiving plate 26 is pushed up to the imaginary line position and discharged from the discharge port 35 to the chute 38. On the other hand, the separated water in the main body tank 3 of the floating separation tank 2 is introduced into the separation tank 5 through the communication pipe 8 with the filter 9 at the bottom and drained through the overflow port 10. Used.

  When a plurality of air dissolution tanks 46 are provided, it is utilized when the amount of scum-containing sewage increases. That is, when the scum-containing sewage is in a normal amount, it can be satisfied with only one air dissolution tank 46, but when it is increased in quantity, it cannot be satisfied with it alone. In the case of the two tanks shown in the figure, the pressure is dissolved from the water supply in one air dissolution tank 46 and the discharge operation is further performed. The discharge process can be performed continuously by performing pressure dissolution → discharge operation. For example, it is performed by substantially matching the discharge start timing from the other air dissolution tank 46 with the timing at which the discharge from one air dissolution tank 46 ends. The same timing is set when three or more air dissolution tanks 46 are configured.

It should be noted that a timing may be taken so that the discharge of the other air dissolution tank 46 is started after a certain time difference after the discharge from one air dissolution tank 46 ends.
Further, as shown in FIG. 8, the air dissolving tank 46 may be provided with an air blowing material 66 such as a perforated plate or a net-like material in a lower opening of the outer cover 67 so that fine air can be introduced. In this case, clogging of the air blowing material 66 can be removed by blowing the air through the air blowing material 66 after draining the residue in the air dissolution tank 46. The separation tank 5 may be replenished with separated water through a makeup water pipe.

DESCRIPTION OF SYMBOLS 1 ... Levitation separation apparatus 2 ... Levitation separation tank 3 ... Tank main body 5 ... Separation tank 17 ... Screw conveyor 18 ... Casing 19 ... Scum guide 20 ... Scum intake 22 ... Screw shaft 23 ... Lifting screw 23a ... Screw main body 23b ... Crawling ridge 26 ... Compression receiving plate 33 ... Repulsion spring 35 ... Discharge port 40 ... Driving source (driving means) 45 ... Pressurized air dissolving device 46 ... Air dissolving tank

Claims (1)

The collected scum-containing sewage is jetted into the floating separation tank together with water generated by a pressurized air dissolving device that dissolves air by pressurization, and the scum is floated in the floating separation tank and the scum that floated is The scum discharge device has a lifting screw, a casing with a scum intake port, and a rotation driving means for the lifting screw, and the casing is installed in an inclined manner in the floating separation tank. The lower part in the inclined direction is supported by the floating separation tank, while the upper part in the inclined direction is located outside the floating separation tank higher than the water surface, and the scum can be discharged through the discharge port formed in the casing. The mouth is a scum guide with a slope guide that is opened around the lower part of the lower part of the casing in the inclination direction and rises. In the pressurized levitation type scum separation processing device configured to be able to be taken in via the scum, a scooping ridge projecting upward in the inclined direction at least on the peripheral portion of the lifting screw corresponding to the scum taking-in port Is provided with a pressure levitation type scum separation processing device.

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