JP5138442B2 - Sludge concentrator - Google Patents

Description

  The present invention relates to a sludge concentrating device.

Conventionally, as a sludge concentrating device for filtering and concentrating sludge, a drum screen is formed by arranging a plurality of wedge wires in a substantially cylindrical shape with a predetermined gap therebetween, and a plurality of sludges are transferred to the inner surface of the drum screen. There is known a sludge concentrator that provides a blade and filters and concentrates sludge by using a gap between the wedge wires as a filtration part while sending sludge to the outlet side by a sludge transfer blade according to the rotation of the drum screen (for example, patent document) 1).
JP 2002-177712 A

  However, the sludge concentrating device is required to further improve the filtration efficiency.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a sludge concentrating device with improved filtration efficiency.

  Here, as a result of intensive studies, the present inventors have found that the sludge introduced into the drum screen slides up and down on the wedge wire within a certain range of rotation direction (in the arc range on the lower side of the drum screen). However, since the sludge is carried to the outlet side by the sludge transfer blade, the sludge is almost in a lump state, and a large amount of moisture remains on the upper side of the sludge that is not in contact with the inner surface of the wedge wire. As a result, it discovered that filtration efficiency was bad.

Accordingly, a sludge concentrating device according to the present invention includes a rotating drum screen provided with a plurality of filtration parts communicating with the inside and outside of a substantially cylindrical peripheral wall, and a conveying blade provided on the inner surface of the drum screen to convey the introduced sludge. A sludge concentrating device that feeds sludge to the outlet side while contacting the inner surface of the drum screen with the conveying blade according to the rotation of the drum screen, and filters and concentrates it at the filtration unit, and the conveying blade is an axis of the drum screen. An agitating member that is disposed obliquely with respect to the direction and is located between the conveying blades adjacent in the axial direction on the inner surface side of the drum screen, and agitates sludge conveyed between the conveying blades It is characterized by providing .

  According to such a sludge concentrating device, the sludge introduced into the inside of the drum screen having a plurality of filtration parts communicating with the inside and outside of the substantially cylindrical peripheral wall is conveyed by the conveying blades provided on the inner surface of the drum screen. It is sent to the outlet side while contacting the inner surface of the screen according to the rotation of the drum screen, and is concentrated by filtration at the filtration unit. When this sludge is fed, the stirring member provided on the inner surface side of the drum screen stirs the sludge mass that slides on the inner surface of the drum screen. As a result, the lower high-concentration sludge used for filtration and concentration is rolled up. The low-concentration sludge comes into contact with the inner surface of the drum screen, and the low-concentration sludge is also subjected to filtration and concentration, thereby improving filtration efficiency.

Further, the conveying blade is characterized in that it is formed in a spiral shape on the inner surface of the drum screen. Here, as a configuration suitably exhibiting the above-described operation, specifically, the drum screen is configured by arranging a plurality of wedge wires in parallel with a predetermined gap therebetween, and the stirring member is provided on the inner surface of the wedge wire. The structure installed so that it may protrude toward and may contact the inner surface of the said wedge wire, or may have a clearance gap with respect to an inner surface is mentioned.

  In addition, the drum screen is configured by arranging a plurality of wedge wires side by side with a predetermined gap therebetween, and the agitating member may be a protrusion provided on the inner surface of the wedge wire.

  Thus, according to this invention, it becomes possible to improve the filtration efficiency of a sludge concentration apparatus.

  Hereinafter, a preferred embodiment of a sludge concentration apparatus according to the present invention will be described with reference to the drawings. 1 is a partially cutaway side view showing a sludge concentrating device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the sludge concentrating device shown in FIG. 1, and FIG. 3 is a projection in FIG. FIG. 4 is a view of FIG. 3 as viewed from above, FIG. 5 is a view showing a protrusion and its vicinity, and is a view corresponding to FIG. 4, FIG. 6 is a VI-VI arrow in FIG. It is a view and the sludge concentration apparatus of this embodiment is employ | adopted as the sludge processing equipment.

  As shown in FIGS. 1 and 2, the sludge concentrating device 100 includes a substantially cylindrical drum screen 1. The drum screen 1 is formed by arranging a large number of wedge wires 1a extending in the lateral direction (horizontal direction; right and left direction in FIG. 1) with a predetermined gap along the circumferential direction. The gap between 1a is made into the filtration part 1b for connecting inside and outside and filtering sludge.

  As shown in FIG. 2, the wedge wire 1a has a triangular cross-section, and a gap 1b having a predetermined interval therebetween. As shown in FIGS. 1 and 2, these wedge wires 1a are arranged so as to surround the wedge wire 1a in an annular shape and are arranged at predetermined intervals along the axial direction. Accordingly, the wedge wires 1a are connected so as to be bundled and reinforced so as to exhibit a predetermined cylindrical shape.

  On the inner surface of these wedge wires 1a (drum screen 1), there are provided screws 3 as conveying blades for sending the sludge introduced from the inlet side on one end side to the outlet side on the other end side. Here, the screw 3 is formed in a spiral shape and is provided so as to protrude from the inner surface of the wedge wire 1a toward the inside by a predetermined height.

  A sludge introduction pipe (not shown) for introducing sludge into the drum screen 1 is disposed at a position eccentric in the radial direction from the central axis of the drum screen 1, and the sludge is introduced into the wedge when the sludge is introduced. It arrange | positions in proximity to the inner surface of the wedge wire 1a so that it may not hit and hit the inner surface of the wire 1a.

  The drum screen 1 is supported by rollers disposed below the drum screen 1 and is directly rotated by a chain and a sprocket.

  Here, particularly in the present embodiment, the inner surface of the drum screen 1 (wedge wire 1a) is provided with a protrusion 4 as a stirring member. As shown in FIGS. 5 and 6, the protrusion 4 is installed on the inner surface of the wedge wire 1 a between the conveying blades constituting the screw 3 by, for example, welding.

  The shape of the protrusion 4 is not particularly limited, and may be, for example, a cylindrical shape, a quadrangular prism shape, a triangular prism shape, a conical shape, a triangular pyramid shape, or the like. For example, a nut or the like may be used.

  Further, the number of the protrusions 4 is not particularly limited, and may be a large number or a single number.

  According to the sludge concentrating device 100 configured as described above, when the coagulated sludge is introduced into the drum screen 1, the sludge comes into contact with the inner surface of the screen 1 according to the rotation of the drum screen 1 by the screw 3. At this time, it is filtered and concentrated by the filtration unit 1b.

  At the time of feeding the sludge, the sludge slides up and down on the wedge wire 1a within a certain range in the rotation direction (in the arc range on the lower side of the drum screen 1; see FIG. 2), while being discharged by the screw 3. However, in this embodiment, as shown in FIGS. 3 and 4, the protrusion 4 provided on the inner surface of the drum screen 1 is formed on the inner surface of the drum screen 1. The sludge mass 5 is crushed and agitated by sliding on the sludge, and the high-concentration sludge 5a below the dotted line in FIG. 3 that is used for filtration concentration is wound up, and the low-concentration sludge 5b above the dotted line in FIG. Comes into contact with the inner surface of the drum screen 1 (wedge wire 1a), and the low-concentration sludge 5b is also subjected to filtration and concentration. Therefore, according to this embodiment, the filtration efficiency can be improved.

  In addition, instead of the protruding portion 4, for example, a plate-like member extending in the axial direction is used, and the structure in which the sludge is lifted to a predetermined height and then dropped, the sludge mass is shattered and scattered, This is not preferable because the treatment cannot be performed satisfactorily.

  FIG. 7 is a view showing a protrusion of a sludge concentrating device according to another embodiment and the vicinity thereof, and is a view corresponding to FIG. 5, and FIG. 8 is a view taken along arrows VIII-VIII in FIG.

  This embodiment is different from the previous embodiment in that a flat plate is provided between the conveying blades constituting the screw 3 instead of the protrusion 4 fixed to the inner surface of the drum screen 1 (wedge wire 1a) by welding or the like. The member 13 is stretched, and the flat plate member 13 is provided with a protruding member 14 that protrudes toward the inner surface of the wedge wire 1a and contacts the inner surface as a stirring member.

  Even in such a configuration, as in the previous embodiment, since the stirring member for stirring the sludge is provided on the inner surface side of the drum screen 1, it is almost the same as in the previous embodiment. Effects can be obtained.

  In this embodiment, in order to increase the stirring efficiency, the protruding member 14 is provided so as to contact the inner surface of the wedge wire 1a, but may be provided so as to have a small gap with respect to the inner surface of the wedge wire 1a. .

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, it is particularly preferable that the conveying blade is a spiral screw. 3, for example, along the inner surface of the drum screen 1, provided that the conveying blade is provided on the inner surface of the drum screen 1 and sends sludge to the outlet side while contacting the inner surface of the drum screen 1 as the drum screen 1 rotates. It may be a conveyance blade or the like that is intermittently arranged and inclined obliquely with respect to the axial direction.

  Moreover, in the said embodiment, the application with respect to the sludge concentration apparatus 100 which comprised the drum screen 1 by arranging many wedge wires 1a extended in the horizontal direction along the circumferential direction through predetermined gaps. As described above, the present invention is naturally applicable to a sludge concentrator in which a drum screen is configured by arranging a large number of wedge wires having an annular shape along the axial direction with a predetermined gap therebetween. In addition, the drum screen is not limited to a configuration having a plurality of filtration parts communicating with the inside and outside of the peripheral wall by juxtaposing a plurality of wedge wires with a predetermined gap therebetween, for example, The present invention can also be applied to a drum screen provided with a through-hole communicating with the peripheral wall as the filtration part.

It is a partially broken side view which shows the sludge concentration apparatus which concerns on embodiment of this invention. It is a cross-sectional view of the sludge concentration apparatus shown in FIG. It is an enlarged view of the protrusion part in FIG. 2, and its vicinity. It is the figure which looked at FIG. 3 from the upper side. It is a figure which shows a projection part and its vicinity, and is a figure corresponding to FIG. It is a VI-VI arrow line view of FIG. It is a figure which shows the projection part of the sludge concentration apparatus which concerns on other embodiment, and its vicinity, and is a figure corresponding to FIG. It is a VIII-VIII arrow line view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drum screen, 1a ... Wedge wire, 1b ... Filtration part (gap), 3 ... Screw (conveying blade), 4 ... Protrusion part (stirring member), 14 ... Protruding member (stirring member), 100 ... Sludge concentration apparatus.

Claims (4)

A drum screen that rotates with a plurality of filtration parts communicating with the inside and outside of a substantially cylindrical peripheral wall, and a conveying blade that is provided on the inner surface of the drum screen to convey the introduced sludge. A sludge concentrating device that feeds to the outlet side while contacting the inner surface of the drum screen by the conveying blade according to the rotation of the drum screen, and performs filtration and concentration at the filtration unit,
The conveying blade is disposed obliquely with respect to the axial direction of the drum screen,
Located between the transport blade each other in the inner surface of the drum screen adjacent in the axial direction, the sludge concentration, characterized in that it comprises a stirring member for stirring the sludge is transported between each other said conveyor blade apparatus.   The sludge concentration apparatus according to claim 1, wherein the conveying blade is spirally formed on an inner surface of the drum screen. The drum screen is configured by juxtaposing a plurality of wedge wires with a predetermined gap therebetween,
The sludge according to claim 1 or 2 , wherein the agitating member is installed so as to protrude toward the inner surface of the wedge wire and to contact the inner surface of the wedge wire or to have a gap with respect to the inner surface. Concentrator. The drum screen is configured by juxtaposing a plurality of wedge wires with a predetermined gap therebetween,
The sludge concentrating device according to claim 1 or 2 , wherein the stirring member is a protrusion provided on an inner surface of the wedge wire.

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