JP2010234291A - Carrier separation apparatus and wastewater treatment method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrier separation apparatus for separating a carrier from excess sludge containing the carrier carrying microorganisms. <P>SOLUTION: The carrier separation apparatus 1 includes: a filter cylinder 11; an outer cylinder 13 for housing the filer cylinder 11; a spiral screw 15 disposed inside the filter cylinder 11; a water-to-be-treated introducing port 14 communicating with the filter cylinder 11; and a separation liquid discharge port 17 communicating with the outer cylinder 13 and capable of discharging separation liquid containing sludge and moisture filtered by the filter cylinder 11. The filter cylinder 11 is provided, on at least a part, with a metallic filter part 12 and a carrier recovery port 16 capable of recovering the carrier separated by the filter part 12. While at least a part of water to be treated introduced from the water-to-be-treated introducing port 14 of the carrier separation apparatus 1 is made to flow spirally along the screw blades of the spiral screw 15 disposed inside the filter cylinder 11, the sludge and the moisture in the water to be treated are made to pass through the filter part 12 of the filter cylinder 11, and the carrier in the water to be treated is separated inside the filter cylinder 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a carrier separator and a wastewater treatment method using the same.

  For example, industrial wastewater with organic pollution is purified in a biological treatment tank using activated sludge. In addition, when a fine porous carrier such as activated carbon is introduced into the biological treatment tank, organic substances are decomposed on the surface and pores of the porous carrier, and this reaction can be used to improve the treatment efficiency. It has been broken.

On the other hand, when the porous carrier is charged, the expensive porous carrier is discharged out of the system together with the sludge, and as a result, there is a problem that a new porous carrier must be charged again. In addition, since it takes about half a year to acclimate microorganisms that inhabit the surface and pores of the porous carrier, the microorganisms are acclimatized every time the porous carrier is discharged, resulting in poor efficiency. It was. For this reason, in order to solve these problems, a method has been proposed in which a porous carrier (biological carrier) discharged together with sludge is collected and reused (Patent Document 1).
Japanese Patent No. 3665042

  The method of Patent Document 1 is a method in which surplus sludge containing a biological carrier is supplied to a sludge vacuum concentrator, and the sludge is floated and concentrated in the sludge vacuum concentrator and the porous carrier is settled and separated. However, the sludge vacuum concentrator is expensive and has a high initial cost. For this reason, there is a need for a method for easily recovering a biological carrier without using an expensive machine such as a sludge vacuum concentrator.

  Therefore, the present invention provides a new method capable of recovering a biological carrier.

  The present invention relates to a carrier separation device for separating the carrier from water to be treated containing a carrier carrying microorganisms and sludge, a filtration cylinder, an outer cylinder for housing the filtration cylinder, and the filtration cylinder A spiral screw disposed inside, a treated water introduction port communicating with the filter cylinder, a separation liquid discharge that communicates with the outer cylinder and can discharge a separation liquid containing sludge and moisture filtered by the filter cylinder. The filter cylinder has a metal filter part at least in part, and a carrier recovery port capable of recovering the carrier separated into the filter cylinder by the filter part, The spiral screw includes a shaft and a screw blade spirally wound around the shaft, and at least a part of the water to be treated introduced from the water to be treated inlet is spirally guided by the guide of the screw blade. Flow While, the sludge and moisture in the for-treatment water passed through the filter portion of the filter tube, and relates to a carrier separation device capable of separating the carrier of the water to be treated in the filtration cylinder.

  According to the carrier separation device of the present invention, since the water to be treated including the carrier and sludge is spirally swung along the screw blades and flows in the filter cylinder, the carrier can be efficiently separated from the water to be treated. The effect that it is possible is preferably produced. According to the carrier separation device of the present invention, for example, the carrier can be separated and recovered without using an expensive device such as a sludge decompression concentration device, and because the structure is simple, it can be manufactured at low cost. The effect that the initial cost can be reduced is preferably exhibited.

[Filtration tube]
In the carrier separation device of the present invention, the filter cylinder has a metal filter part and a carrier recovery port capable of recovering the carrier separated by the filter part.

  Examples of the shape of the filter cylinder include a cylindrical shape and a truncated cone shape. From the viewpoint of improving the separation efficiency, the shape of the filter tube is preferably tapered toward the lower side, that is, an inverted truncated cone shape. By narrowing the taper downward toward the lower side, for example, the water flow rate per unit area of the filter unit and the water flow rate can be made uniform, so that the water to be treated can be evenly distributed throughout the filter unit formed in the filter cylinder. As a result, clogging in the filter portion can be prevented, and the separation efficiency can be further improved.

  The filter portion only needs to be formed on at least a part of the filter cylinder, for example, may be formed on at least a part of the side surface of the filter cylinder, or may be formed on substantially the entire side surface of the filter cylinder. May be. By this filter unit, the carrier can be separated from the water to be treated introduced into the filter cylinder. The filter part can be formed by, for example, a wire mesh, a punching plate, a wedge wire, etc. Among them, a wedge wire is preferable because it is excellent in durability and easy to maintain. Moreover, as a material of a filter part, metal materials, such as aluminum, iron, stainless steel, can be used, for example.

  The carrier recovery port can be formed, for example, on the side surface or bottom of the filter cylinder, and is preferably formed on the bottom of the filter cylinder from the viewpoint of easy recovery of the separated carrier.

[Spiral screw]
The spiral screw includes a shaft and screw blades wound spirally around the shaft. The screw blades spirally wound around the shaft can help the water to be treated to flow spirally in the filter cylinder. Thereby, to-be-processed water can be made to contact more uniformly with the whole filter part formed in the filtration cylinder. The screw blades of the spiral screw may be arranged in a direction perpendicular to the axis, or may be arranged inclined downward from the inner peripheral end (axis side) to the outer peripheral end (filter part side) of the screw blade. Good. By inclining, the contact between the water to be treated and the filter part can be further increased. As the material of the spiral screw, for example, metal materials such as aluminum, iron, and stainless steel, and fiber reinforced plastics can be used. Examples of the reinforced fiber plastic (FRP) include carbon fiber reinforced plastic (CFRP), boron fiber reinforced plastic (BFRP), aramid fiber reinforced plastic (AFRP, KFRP), and glass fiber reinforced plastic (GFRP).

  The spiral screw is preferably disposed in the filter cylinder so as to be coaxial with the filter cylinder. A gap (gap) may be formed between the outer peripheral end of the spiral screw and the inner peripheral surface of the filter cylinder so that the carrier separated by the filter portion does not fall.

The spiral screw may be disposed so as to be rotatable about an axis, or may be fixed. From the viewpoint of the recovery efficiency of the carrier separated by the filter part, it is preferable that the spiral screw is arranged to be rotatable. By disposing the spiral screw in a rotatable manner, for example, the carrier attached to the filter unit is scraped off by the rotation of the spiral screw, and thus the carrier can be efficiently recovered. A motor or the like may be connected to the shaft of the spiral screw as a drive source, but from the viewpoint of running cost reduction, for example, it is preferably attached so as to be rotatable without requiring a drive source, More preferably, it is attached so that it can be rotated by the water flow and / or water pressure of the water to be treated introduced from the treated water introduction port.

[Outer cylinder]
The outer cylinder houses the filter cylinder and communicates with a separation liquid discharge port capable of discharging a separation liquid containing sludge and moisture filtered by the filtration cylinder. The shape of the outer cylinder is not particularly limited as long as the filter cylinder can be arranged inside, and examples thereof include a cylindrical shape and a truncated cone shape, similarly to the filter cylinder. As the material of the outer cylinder, for example, metal materials such as aluminum, iron, stainless steel, and fiber reinforced plastic can be used.

  It is preferable that the filtration cylinder and the outer cylinder are arranged so as to be able to collect the separation liquid containing sludge and moisture that has passed through the filter portion of the filtration cylinder, and more preferably, the inner peripheral surface of the outer cylinder And a space is formed between the outer peripheral surface of the filter cylinder. The separated liquid collected here is discharged to the outside of the carrier separation device through a separation liquid discharge port described later.

  The treated water introduction port only needs to communicate with the filtration cylinder so that the treated water can be introduced into the filtration cylinder. From the viewpoint of separation efficiency, it is preferable to communicate with the upper part of the filtration cylinder. More preferably, it is in communication with the upper side surface of the filter cylinder.

  The separation liquid discharge port only needs to communicate with the outer cylinder so that the separation liquid can be discharged. For example, it is preferable to communicate with the side surface of the outer cylinder, the bottom surface of the outer cylinder, and the like, and communicate with the lower side surface of the outer cylinder from the viewpoint of the efficiency of discharging the separated liquid.

  It is preferable that the carrier separation device includes a backwash water introduction means for introducing backwash water into the outer cylinder. Thereby, the support | carrier, sludge, etc. which adhered to the filter part can be wash | cleaned, and separation efficiency can be improved more. The introduction of the backwash water by the backwash water introduction means can be performed from the separation liquid discharge port via the backwash valve.

  The carrier separation in the carrier separation apparatus of the present invention is performed as follows. First, to-be-treated water containing a carrier supporting microorganisms and sludge is introduced into the filter cylinder from the to-be-treated water inlet. The water to be treated introduced into the filter cylinder flows spirally along the screw blades in the filter cylinder. As a result, the sludge and water in the water to be treated are passed through the filter part, and the carrier in the water to be treated is captured by the filter part, whereby the carrier is separated and collected in the filter cylinder. The spiral flow of the water to be treated may be, for example, by a guide of a screw blade, or by a water flow and / or water pressure of the water to be treated introduced into the water to be treated inlet. .

  That is, the present invention provides, as another aspect, a method for separating a carrier using the carrier separation device of the present invention, wherein water to be treated containing a microorganism-carrying carrier and sludge is introduced into a filter cylinder of the carrier separation device. And allowing the introduced treated water to flow spirally in the filter cylinder while allowing the sludge and moisture in the treated water to pass through the filter portion of the filter cylinder, and in the treated water The present invention relates to a carrier separation method including separating the carrier into the filter cylinder.

  According to the carrier separation method of the present invention, since the carrier separation apparatus of the present invention is used, an effect that the carrier can be efficiently separated from the water to be treated containing the microorganism-supported carrier and sludge is preferably exhibited. Moreover, according to the carrier separation method of the present invention, since the inside of the filter cylinder is spirally flowed, the effect that the carrier can be efficiently separated is preferably exhibited. The carrier separation method of the present invention may further include a step of recovering the separated carrier.

In the present invention, the water to be treated is not particularly limited as long as it contains a carrier supporting microorganisms and sludge, and for example, biologically treated water, biologically treated water using the carrier or carrier and sludge is used. And treated water discharged from the sludge agglomeration tank. The carrier is not particularly limited as long as it is a carrier capable of supporting microorganisms, and examples thereof include activated carbon, porous ceramic, porous carbon, zeolite, silica sand, and incinerated ash.

  In another aspect, the present invention is a method for treating waste water using a carrier supporting microorganisms and activated sludge, and in a biological treatment tank, water to be treated using the carrier supporting microorganisms and activated sludge. A wastewater treatment method in which the recovery of the microorganism-supported carrier is performed using the carrier separation apparatus of the present invention, including performing treatment and recovering the microorganism-supported carrier from excess sludge discharged from the biological treatment tank .

  According to the wastewater treatment method of the present invention, it is preferable that the carrier can be efficiently separated and recovered.

  The wastewater treatment method of the present invention may include reusing the collected biological carrier, and may include introducing the collected biological carrier into the biological treatment tank. By reusing the collected biological carrier, the running cost of waste water treatment can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the following description is merely an example, and it goes without saying that the present invention is not limited to this.

  FIG. 1 is a schematic view showing an example of an embodiment of the carrier separation device 1 of the present invention. 1A is a top view and FIG. 1B is a side view. As shown in FIG. 1, the carrier separation device 1 includes an outer cylinder 13, a filtration cylinder 11, a spiral screw 15, a water to be treated inlet 14, and a separation liquid outlet 17.

  As shown in FIG. 1B, the filter cylinder 11 is arranged in the outer cylinder 13, and the spiral screw 15 is arranged in the filter cylinder 11. The outer cylinder 13, the filter cylinder 11, and the spiral screw 15 are arranged so that their axial centers are substantially coaxial. A separation liquid discharge port 17 is formed on the side surface near the bottom of the outer cylinder 13, and a carrier recovery port 16 is formed on the bottom of the filter cylinder 11.

  Each of the filtration cylinder 11 and the outer cylinder 13 has a tapered shape that becomes narrower downward, and the cross-sectional shape is a substantially inverted truncated cone shape. A filter portion 12 using a wedge wire is formed on the entire side surface of the filter cylinder 11. As a material of the filter unit 12, as described above, a wire mesh, a punching plate, a wedge wire, or the like can be used. In this embodiment, a wedge wire is used.

  FIG. 3 is a partial perspective view of the filter unit 12. As shown in FIG. 3, the filter unit 12 uses a plurality of wedge wires 20 having a substantially triangular cross-section as a filter material, and forms an inverted truncated cone shape. More specifically, the wedge wire 20 is arranged with the apex 20a of the wedge wire 20 as the outer peripheral side (outer cylinder side) of the filter tube 11 and the base 20b as the inner peripheral side of the filter tube 11, and these are adjacent in the circumferential direction. To form an inverted frustoconical shape. Then, as shown in FIG. 3, it is possible to assemble by arranging an annular assembly bar 21 on the outer peripheral side and welding the assembly bar 21 and the wedge wire 20. Further, the gap 20c between the wedge wire 20 and the adjacent wedge wire 20, that is, the mesh width (opening) of the wedge wire only needs to be large enough to separate the sludge and the carrier. 1 mm or more and 0.2 to 1 mm, preferably about 0.5 mm.

The spiral screw 15 in FIG. 1 is attached to be rotatable about a shaft 18. The shape of the spiral screw 15 is narrowed from the treated water introduction port 14 toward the carrier recovery port 16 so that the outer peripheral end thereof is along the inner peripheral surface of the tapered filter cylinder 11. Further, a gap may be formed between the outer peripheral end of the spiral screw 15 and the inner peripheral wall of the filter cylinder 11 within a range where the carrier does not fall, for example. FIG. 2 shows a schematic diagram of the spiral screw 15. FIG. 2A is a top view of the spiral screw, and FIG. 2B is a side view. As shown in FIG. 2, the spiral screw 15 has a configuration in which screw blades are attached to the shaft 18 so as to draw a counterclockwise spiral around the shaft 18 when viewed from the upper surface of the carrier separation device.

  The treated water introduction port 14 is formed so as to penetrate the outer cylinder 13 and communicate with the filter cylinder 11 and to introduce treated water near the upper end of the spiral screw 15 disposed in the filter cylinder 11. Has been. By forming in this way, for example, the spiral screw 15 is efficiently rotated about the shaft 18 in the clockwise direction when viewed from the upper surface of the carrier separation device by the flow and / or water pressure of the water to be treated introduced into the filter cylinder. Can do. By rotating the spiral screw 15, the separation efficiency can be improved and the separated carrier can be moved to the lower part of the filter cylinder 11.

  An example of a carrier separation method using this carrier separation apparatus 1 will be described.

  From the treated water inlet 14, treated water including a carrier on which microorganisms are supported and sludge is introduced into the filter cylinder 11 (arrow X 1). The introduced water to be treated is guided by the spiral blades of the spiral screw 15 arranged in the filter cylinder 11 to flow in a spiral manner in the filter cylinder 11 while the carrier from the water to be treated is filtered in the filter unit 12. Separation takes place. That is, the sludge in the water to be treated, the carrier and moisture smaller than the opening of the filter part (wedge wire) 12 pass through the filter part 12 (arrow X5), and are formed between the filter cylinder 11 and the outer cylinder 13. On the other hand, the carrier 19 is separated and collected in the filter cylinder 11.

  FIG. 4 schematically shows a state where the carrier and sludge are separated by the wedge wire. In addition, the same code | symbol is attached | subjected to the same location as FIG. As shown in FIG. 4, when the water to be treated flows (arrow X5 ′), the filter unit 12 captures a thing larger than the opening of the wedge wire 12 such as the carrier 19 in the gap 20c, and sludge smaller than that. 22 or moisture is passed through the filter 12 as a separation liquid (arrow X5 ′) and flows into the space formed between the filter cylinder 11 and the outer cylinder 13 (FIG. 1B). In this way, the carrier 19 can be separated from the water to be treated.

  The carrier 19 recovered as described above is collected near the carrier recovery port 16 (19a) and can be recovered through the carrier recovery port 16 (arrow X3). The carrier 19 collected in this way can be reused for wastewater treatment again. Further, the separation liquid recovered in the space can be discharged to the outside from the separation liquid discharge port 17 (arrow X2).

  Further, since the spiral screw 15 is rotatably attached and the treated water introduced by the treated water introduction port 14 is formed so as to contact the upper portion of the spiral screw 15, the treated water introduction port 14 By introducing the water to be treated, the spiral screw 15 can be rotated in the clockwise direction (arrow X6). The rotation of the spiral screw 15 causes the carrier 19 attached to the filter unit 12 to be scraped off and moved to the carrier recovery port 16 side.

Moreover, a carrier adheres to the filter part 12, closes the filter part 12, and a differential pressure may be generated between the water to be treated introduced into the filter cylinder 11 and the separated liquid discharged from the filter cylinder. In such a case, for example, it is preferable to introduce backwash water from the separation liquid discharge port 17 in the direction of the arrow X4. By introducing backwash water from the direction of the arrow X4, the carrier attached to the filter portion 12 of the filter cylinder 11 can be removed, and the blocking state of the filter portion 12 can be eliminated. The introduced backwash water can be discharged from the carrier recovery port 16 by closing the valve of the treated water introduction port 14 (arrow X3).

  The carrier separation device of the present embodiment preferably has the effects that the structure is simple and there are few failures, the frequency of repair and replacement can be reduced, and the running cost can be reduced.

  As described above, the carrier that has been crushed and reduced in the activated sludge treatment that has been the cause of the differential pressure of the sand filter can be separated and recovered together with the sludge as described above. For this reason, by separating and recovering the carrier with the carrier separation apparatus of the present invention, it is possible to effectively separate the worn carrier and the reusable carrier, and to reduce the influence on the advanced processing equipment in the subsequent stage.

  The present invention is useful in wastewater treatment using biological treatment such as activated sludge treatment.

FIG. 1 is a schematic diagram illustrating an example of a carrier separation device, in which FIG. 1A is a top view and FIG. 1B is a side view. FIG. 2 is a schematic diagram illustrating an example of a spiral screw, in which FIG. 2A is a top view and FIG. 2B is a side view. FIG. 3 is a partial perspective view illustrating an example of the filter unit. FIG. 4 is a schematic diagram showing a state in which the carrier and the sludge are separated by the filter unit.

DESCRIPTION OF SYMBOLS 1 Carrier separation apparatus 11 Filter cylinder 12 Filter part 13 Outer cylinder 14 Water to be treated inlet 15 Spiral screw 16 Carrier recovery port 17 Separating liquid outlet 18 Rotating shafts 19 and 19a Carrier 20 Wedge wire 20a Vertex 20b Bottom 20c Gap 21 Assembly muscle 21 Sludge

Claims (9)

A carrier separation device for separating the carrier from the water to be treated containing a carrier carrying microorganisms and sludge,
A filter tube;
An outer cylinder that houses the filter cylinder;
A spiral screw disposed in the filter cylinder;
A treated water inlet communicating with the filter cylinder;
A separation liquid outlet that communicates with the outer cylinder and is capable of discharging a separation liquid containing sludge and moisture filtered by the filtration cylinder;
The filter cylinder has a metal filter part at least in part, and a carrier recovery port capable of recovering the carrier separated into the filter cylinder by the filter part,
The spiral screw includes a shaft and a screw blade spirally wound around the shaft,
The sludge and water in the water to be treated pass through the filter part of the filter cylinder while causing at least a part of the water to be treated introduced from the treated water introduction port to flow spirally by the guide of the screw blade. And a carrier separation device capable of separating the carrier in the water to be treated into the filter cylinder.   The carrier separation tank apparatus according to claim 1, wherein the spiral screw is rotatably arranged.   The carrier separation device according to claim 1 or 2, wherein the filter tube is tapered toward the lower side.   The carrier separation device according to any one of claims 1 to 3, wherein the filter unit is formed of a wedge wire.   The carrier separation device according to any one of claims 1 to 4, wherein a gap between an outer peripheral end of the spiral screw and the filter cylinder is smaller than a carrier separated by the filter unit.   The carrier separation device according to any one of claims 1 to 5, further comprising backwash water introduction means for introducing backwash water into the outer cylinder.   The carrier separating apparatus according to claim 1, wherein the carrier to be separated and recovered is activated carbon. A method for separating a carrier using the carrier separation device according to any one of claims 1 to 7,
Introducing the water to be treated containing the microorganism-supporting carrier and the sludge into the filter cylinder of the carrier separation device; and
While introducing the treated water in a spiral manner in the filtration cylinder, the sludge and moisture in the treated water are allowed to pass through the filter portion of the filtration cylinder, and the carrier in the treated water is used as the carrier. A carrier separation method comprising separating into a filter cylinder. A wastewater treatment method using a carrier supporting microorganisms and activated sludge,
In the biological treatment tank, treatment of water to be treated using a carrier supporting microorganisms and activated sludge; and
Recovering the microorganism-supporting carrier from excess sludge discharged from the biological treatment tank,
A wastewater treatment method, wherein the recovery of the microorganism-supporting carrier is performed using the carrier separation device according to any one of claims 1 to 7.

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