JP2005193105A - Drum screen and solid-liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum screen capable of reducing washing water used by efficiently washing a wedge wire of the drum screen even in the case of arranging to use a spiral in the drum screen, and a solid-liquid separator using the same. <P>SOLUTION: The spiral 8 facing a part or the whole of the inner edge face of a drum body 1a is arranged on the inner edge side of the roughly cylindrical drum body 1a on which a number of discharge parts 1b are formed. The drum screen comprises forming a projection part 8a which can be inserted into the discharge part 1b of the drum body 1a on the outer edge face side of the spiral 8, and allowing the drum body 1a and the spiral 8 to be relatively movable. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drum screen and a solid-liquid separation device, and more particularly to a drum screen that is used with a spiral disposed inside the drum screen and a solid-liquid separation device using the drum screen.

  In the sludge treatment process, a screen-type solid-liquid separator is frequently used to concentrate sludge. This is configured such that sludge is introduced into a rotary drum screen from a sludge introduction pipe, and the sludge is concentrated while discharging the liquid portion from the bottom while rotating the drum, and is carried out to the outside.

  According to this method using a drum screen, organic sludge such as sewage and human waste, which are flocified by adding a flocculant in the flocculent mixing tank in the previous step, by using a fine screen having a mesh width of 0.5 mm or less Can be effectively concentrated.

  If the screen becomes clogged with use, high-pressure water of about 1.0 to 2.0 MPa is washed continuously or intermittently using a timer to restore the function. . However, if washing is performed continuously or the frequency of washing is increased, a large amount of water is required for the washing water. In particular, when clean water is used as the washing water, the processing cost is significantly increased. In addition, when a large amount of washing water is used, there is a problem that the solids recovery rate is reduced.

Therefore, a method of mechanically cleaning the sliding brush with a cleaning brush from the inside and the outside of the wedge wire constituting the outer peripheral surface of the drum screen is considered (for example, Patent Document 1).
JP 2002-177712 A.

  However, usually in this kind, a spiral is often arranged inside the drum screen to concentrate the sludge that has been put in along with the rotation of the drum to discharge the solid matter. In such a case, Even if it is going to use the said prior art, since it becomes impossible to use a brush from the inside and a washing | cleaning efficiency is reduced to a half, after all, a considerable amount of washing water must be used.

  Therefore, in view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is to efficiently clean the wedge wire of the drum screen even when the spiral is arranged inside the drum screen. Another object of the present invention is to provide a drum screen that can reduce the use of washing water and a solid-liquid separator using the drum screen.

  The above object can be achieved by the invention described in the claims. In other words, the drum screen according to the present invention has a characteristic configuration in which a spiral facing a part or the entire circumference of the inner peripheral surface of the drum main body is provided on the inner peripheral side of the substantially cylindrical drum main body on which a large number of drainage portions are formed. Is formed on the outer peripheral surface side of the swirl, and a protrusion that can be inserted into the drainage part of the drum body is formed, and the drum body and the spiral are relatively movable. There is.

  According to this structure, it can be inserted into the drainage part of the drum main body, and the dirt attached to the drum main body is removed by continuously and mechanically scraping off by the protrusion provided on the outer peripheral surface side of the spiral. Therefore, the subsequent washing with the washing water requires a small amount of water, and it is possible to reliably prevent clogging during operation, thereby increasing the solid matter recovery rate. When used in a solid-liquid separator, the drum screen is not easily clogged even when the drum screen rotation speed is reduced and the concentrated sludge concentration is increased to increase the solid matter recovery rate. High functionality can be maintained.

  As a result, even when a spiral is disposed inside the drum screen, the drum screen wedge wire and the like can be efficiently cleaned, thereby providing a drum screen that can reduce the use of cleaning water.

  It is preferable that the drum main body and the spiral are moved in a reverse manner with respect to each other by different driving means.

  According to this configuration, the sludge residence time can be adjusted and the concentrated sludge concentration can be adjusted by appropriately adjusting the rotation direction and rotation speed of the drum body and the spiral individually. The separation device can maintain its function higher.

  It is preferable that a rotating brush capable of cleaning the outer peripheral surface of the drum main body is provided on the outer peripheral surface side of the drum main body.

  According to this configuration, it is possible to mechanically remove hair residue, fiber residue, screen residue, and other dirt adhering to the drum body, thereby further reducing the use of washing water.

  Moreover, the solid-liquid separation device according to the present invention is characterized in that the drum screen according to any one of claims 1 to 3 is provided inside, the liquid portion of the input workpiece is discharged, and the solid portion is concentrated. There is to do.

  According to this configuration, even when a spiral is placed inside the drum screen, a solid-liquid separation device is provided that can efficiently wash the wedge wire of the drum screen and reduce the use of washing water. can do.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the left side internal structure of the solid-liquid separator A according to this embodiment, and FIG. 2 shows the front structure.

  As shown in FIGS. 1 and 2, the solid-liquid separator A is placed and fixed on a frame 3, and a drum body 1 a constituting a drum screen 1 is rotatably disposed inside a casing 2. . The drum main body 1a has a substantially cylindrical shape, and a plurality of wedge wires are arranged on the outer peripheral surface thereof to form a drum screen, and a large number of gaps 1b (corresponding to a drainage part) are formed between the wedge wires. The sludge liquid part can be discharged downward. The drum main body 1a is rotationally driven by an electric motor M1 that rotates the rotation support portions 10 provided at the front, rear, left and right to support the drum main body 1a by using a transmission means such as a pulley (not shown).

  Sludge, which is an object to be treated, is introduced from a sludge inlet 4 formed on one end in the longitudinal direction of the drum screen 1, and a liquid portion such as moisture in the introduced sludge is contained in the drum main body 1a. The concentrated solid portion discharged from the downstream lower separation liquid discharge port 5 is carried out from the sludge discharge port 6 on the downstream side.

  A plurality of cleaning water nozzles 7 are provided on the inner upper portion of the casing 2 over the longitudinal (axial) direction of the casing 2 so as to inject cleaning water onto the drum screen 1. However, instead of arranging a plurality of washing water nozzles 7, one nozzle may be run in the longitudinal direction of the casing 2.

  A substantially cylindrical spiral 8 is concentrically arranged on the inner peripheral surface side of the substantially cylindrical drum body 1a, and is configured to be rotatable relative to the drum body 1a. That is, the spiral 8 is rotationally driven by the electric motor M2, and is rotated in a direction opposite to the rotational direction of the drum body 1a. The rotational drive of the spiral 8 by the electric motor M2 is not shown in order to avoid complication, but various transmission means such as a pulley or a gear drive can be employed. As shown in detail in FIGS. 3 and 4, protrusions 8 a are formed on the outer peripheral side of the spiral 8 at intervals corresponding to the wedge wires of the drum body 1 a, that is, intervals corresponding to the mesh width. The portion 8a is inserted into the gap 1b between the wedge wires of the drum main body 1a, and with the relative rotation between the drum main body 1a and the spiral 8, the hair, fiber, and other residue adhered to the wedge wire, screen residue and other dirt are removed. It is designed to scrape continuously and mechanically. Once the protrusion 8a is inserted between the wedge wires of the drum main body 1a, the protrusion 8a acts to mechanically scrape off the adhered dirt during continuous operation. The protrusion 8a is preferably made of metal or resin that is durable and long and retains rigidity. The protrusion 8a is fixed to the spiral 8 and has a tapered tip as shown in FIGS. It is preferable that However, the protrusion 8a may be formed in a brush shape in which a large number of wires are bundled, or may be integrated with the spiral 8 and made of the same material as the spiral 8.

  Because of this, the solid-liquid separator A using the drum screen 1 of the present embodiment does not need to use a large amount of high-pressure water for cleaning as in the prior art, and adheres to the drum body 1a. A significant part of the soil can be removed mechanically, and subsequent washing with washing water requires a small amount of water. In addition, since the solid-liquid separator A does not require the use of high-pressure water as in the prior art, an expensive dedicated pump for high-pressure water is not required, and ordinary low-pressure washing water is used only a few times. It's okay. And since generation | occurrence | production of clogging in operation can be prevented reliably, a solid matter recovery rate can be made high with the use reduction of washing water. Even when the rotation speed of the drum screen is reduced to increase the concentration of concentrated sludge and the solid matter recovery rate is increased, clogging is difficult, so that the function of the solid-liquid separator A can be maintained high. Thus, by appropriately adjusting the rotation direction and the rotation speed of the spiral 8, the sludge residence time can be adjusted and the concentrated sludge concentration can be adjusted, so that the function of the solid-liquid separator A can be constantly maintained high. .

  Furthermore, the brush 9 which can wash | clean the outer peripheral surface may be provided in the outer peripheral surface side of the drum main body 1a. The tip of the brush 9 is in contact with the outer peripheral surface of the rotating drum body 1a, and it is possible to mechanically remove hair and fiber residue, screen residue and other dirt adhered between the wedge wires. . The brush 9 is made of metal, resin, or the like, and may be loosely fitted around a shaft (not shown) or may be attached to a fixed shaft, and further, the fixed shaft. May be rotationally driven by an electric motor.

The solid-liquid separator shown in FIGS. 1 and 2 having a sludge treatment capacity of about 150 m ³ / h is used to rotate the drum body at about 6 rpm, and the spiral in the direction opposite to the rotation direction of the drum body. When the operation was performed by rotating the main body 1 to 2 times / rpm more than the main body, the drum main body was hardly clogged. During that time, the water used for cleaning to maintain the function of the drum body was about 100 L of low-pressure cleaning water having a water pressure of about 0.2 MPa without using a pump motor.
[Another embodiment]
(1) In the above embodiment, the spiral 8 is configured to rotate in the direction opposite to the rotation direction of the drum body 1a. However, the spiral 8 may be rotated in the same direction with different rotation speeds. Good. In short, it is only necessary that both can be rotated relative to each other.
(2) In the above embodiment, an example is shown in which one protrusion 8a of the spiral 8 is provided at each interval in accordance with the interval between the wedge wires formed on the drum body 1a. However, the present invention is limited to this. Instead of this, two or three or more protrusions may be inserted into each interval of the wedge wire.
(3) In the above embodiment, the spiral 8 is in contact with the entire inner peripheral surface of the drum body 1a. However, as shown in FIGS. 5 and 6, the spiral 8 is a part of the inner peripheral surface of the drum body 1a. It may come into contact with the part (the lower part where the solid matter separated by solid-liquid separation is transferred). Even in this case, substantially the same effect as the above-described embodiment can be obtained.
(4) In the above embodiment, the example in which the drainage part formed in the drum body 1a is a large number of gaps 1b formed between the wedge wires is not limited to this. The drainage portion formed on the outer peripheral portion may be a punched metal or mesh screen. In this case, it is preferable that the protruding portion 8a formed on the outer peripheral surface side of the spiral 8 is formed of a brush shape.

The left view which shows one Embodiment of the solid-liquid separator which concerns on this invention Front view of the solid-liquid separator of FIG. Partial sectional view explaining the relationship between drum body and spiral Partial perspective view explaining the relationship between the drum body and the spiral The schematic front view explaining the relationship between the drum main body and spiral of another embodiment The schematic perspective view explaining the relationship between the drum main body and spiral of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum screen 1a Drum main body 1b Drainage part 8 Spiral M1, M2 Drive means

Claims (4)

In the drum screen in which a spiral facing a part or the entire circumference of the inner peripheral surface of the drum main body is disposed on the inner peripheral side of the substantially cylindrical drum main body in which a large number of drainage portions are formed, the outer periphery of the swirl A drum screen characterized in that a protrusion that can be inserted into the drainage part of the drum body is formed on the surface side, and the drum body and the spiral are relatively movable. The drum screen according to claim 1, wherein the drum body and the spiral are rotated relative to each other by different driving means. The drum screen according to claim 1 or 2, wherein a rotating brush capable of cleaning the outer peripheral surface of the drum main body is provided on the outer peripheral surface side of the drum main body. A solid-liquid separation device comprising the drum screen according to any one of claims 1 to 3 inside to discharge a liquid portion of an input workpiece and concentrate the solid portion.

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