JP5147334B2 - Sludge concentrator - Google Patents

Description

  The present invention relates to a concentrator that separates liquid by flowing sludge through a liquid-permeable flow passage.

Industrial wastewater and domestic wastewater are supplied to a coagulation reaction tank and a flocculant is added to agglomerate suspended particles in the liquid to produce floc. Sludge containing floc in the liquid is supplied to a concentrator, and the liquid is separated by gravity to increase the concentration. The concentrated sludge is supplied to a screw press, and the liquid is separated by pressing to obtain a dehydrated cake.
As exemplified in Patent Document 1, the sludge concentrator is provided with a downward passage through which sludge flows down and is concentrated. The outlet of the agglomeration reaction tank is connected to the inlet at the upper end of the downflow passage. The outlet at the lower end of the downflow passage is connected to the inlet of the screw press.
The flow-down passage has a cross-sectional shape of a groove, and the floor board is liquid permeable. A liquid chamber that collects liquid that flows down from the permeation holes of the floor plate is provided under the downflow passage. On the downflow passage, there is provided a downflow speed control device that also sweeps the bottom plate with a brush and controls the speed at which sludge flows down with a baffle plate. Moreover, the washing | cleaning apparatus which injects washing water to a baseplate for every set time is provided.

Japanese Patent No. 2934179

[Issues of background technology]
In the sludge concentrator as described above, when the sludge containing flocs in the liquid flows down the downflow passage, the flocs are dispersed in the liquid in the upstream side portion thereof, and flow like a river. There is a lot of separation. When such sludge reaches the middle position of the downflow passage, the flocs gather due to the decrease in liquid and become a lump. In the downstream portion of the downflow passage, the floc mass flows down. In the floc lump, liquid adheres to the outer surface of the lump in a film shape, and the liquid is sandwiched between adjacent flocks. The floc mass is difficult to separate the liquid inside. Moreover, when the viscosity or surface tension of the liquid is high, it is difficult to separate the liquid film on the outer surface of the lump.

  In addition, when the viscosity or surface tension of the liquid is high, in the flow-down passage, the liquid adheres to the floor board in the form of a film, and the permeation holes of the floor board tend to be clogged. Brushes and cleaning water are used to remove clogs and clean the floor plate of the downflow passage. Washing water is highly consumed.

[Idea for solving problems]
The flow-down passage protrudes a cutting piece such as a blade on the floor board. Then, the sludge or the floc lump is cut by the cut piece protruding on the floor board when flowing down the downflow passage. In the floc mass, the liquid film on the outer surface of the mass is broken, and the inner floc group is cut open. The liquid on the outer surface of the lump and the liquid between the inner flocs can be easily separated.

  Further, the permeation hole of the floor plate of the downflow passage is formed in an elongated shape, the cleaning piece is fitted, and the cleaning piece is moved along the permeation hole. Then, the transmission hole of the floor board is cleaned by the movement of the cleaning piece, and is not easily clogged. No wash water is required.

1) In a sludge concentrator provided with a liquid-permeable downflow passage through which sludge flows,
A flow rate control device that controls the flow rate of sludge with a governing plate that moves from the upstream side to the downstream side of the flow channel,
The flow-down passage is characterized in that a cut piece protrudes on the floor board, and sludge containing flocs on the floor board is pushed by the governing plate and cut by the cut piece.
2) In the above sludge concentrator,
A plurality of the cut pieces are arranged in parallel in the transverse direction of the downflow passage, and the number of parallel pieces is greater on the downstream side of the downflow passage than on the upstream side.
3) In the above sludge concentrator,
The governing plate is characterized in that a large number of hairs protrude from the base into a brush shape, the hairs sweep the floor plate, and the row of hairs passes through the cut pieces on the floor plate.
4) In the above sludge concentrator,
The downflow passage is provided with an elongated permeation hole in the floor board, and a cleaning piece is fitted into the permeation hole,
The cleaning piece is movable along the elongated transmission hole,
The structure is such that the transmission hole is cleaned by moving the cleaning piece.
5) In the sludge concentrator of 4) above,
In the transmission hole of the floor board, penetrate the plate piece,
The plate piece is characterized in that a portion protruding above the floor plate is a cut piece and a portion fitted into the transmission hole is a cleaning piece.
6) In the sludge concentrator of 4) or 5 ) above ,
Each time the set time elapses, the cleaning piece moves forward or backward in a state of being fitted to the transmission hole, and is configured to clean the transmission hole.

  Even if the sludge flowing down the downflow passage becomes a floc lump, the lump is cut by a cut piece protruding into the downflow passage. The liquid is easy to separate.

  Moreover, the permeation | transmission hole of a flow-down channel | path is cleaned by the movement of the cleaning piece fitted to this. Hard to clog.

  As shown in FIG. 1, the sludge concentrator of the embodiment is provided with a downflow passage 1 in which sludge flows down and is concentrated obliquely downward. An outlet of an agglomeration reaction tank (not shown) is connected to the inlet at the rear upper end of the downflow passage 1. The outlet at the lower front end of the flow-down passage 1 is connected to the inlet of a screw press (not shown).

  As shown in FIGS. 1 to 5, the flow-down passage 1 includes left and right side walls 2 and a bottom plate 3, and has a cross-sectional shape in a groove shape. The bottom plate 3 penetrates a large number of permeation holes to make it liquid permeable.

  The floor board 3 is a wedge wire screen, and a wire 4 having a wedge-shaped cross section is disposed along the sludge flow downward direction in the front-rear direction. A large number of wires 4 are arranged in parallel with a gap in the left-right direction and the transverse direction. Below the wire 4, a crosspiece 5 is disposed along the transverse direction. A plurality of crosspieces 5 are arranged in parallel at intervals in the sludge flow downward direction. The wire 4 is fixed to the crosspiece 5. The crosspiece 5 is fixed around the left and right side walls 2. The gap between the wire 4 and the crosspiece 5 is a transmission hole. The permeation holes are rectangular holes and slits that are elongated in the sludge flow downward direction. Many permeation holes are arranged at equal intervals in the sludge flow downward direction and the transverse direction, respectively. Below the flow-down passage 1, a liquid chamber 6 is provided for collecting liquid flowing down from the permeation holes of the floor plate 3.

As shown in FIGS. 1 to 5, a sludge cutting device that also serves as a cleaning device for the permeation holes of the floor plate 3 is provided between the flow-down passage 1 and the liquid chamber 6.
This apparatus supports the movable shaft 11 below the floor plate 3 along the sludge flow downward direction, and is movable in the sludge flow down direction in the axial direction. Two movable shafts 11 are arranged in parallel on the left and right. On the left and right movable shafts 11, horizontal bars 12 are stretched and fixed along the transverse direction. A plurality of horizontal bars 12 are arranged in parallel at intervals in the sludge flow downward direction. The parallel spacing of the horizontal bars 12 is the same as that of the crosspieces 5 of the floor board 3.

  A plate piece 13 is penetrated and fixed to each horizontal bar 12. The plate-like plate pieces 13 are arranged vertically along the sludge flow downward direction, that is, along the longitudinal direction of the permeation holes of the floor plate 3. A large number of the plate pieces 13 are arranged in parallel with a gap in the transverse direction. The parallel interval of the plate pieces 13 is the same as the interval in the transverse direction of the transmission holes of the floor plate 3.

  Some of the plate pieces 13 are tall, pass through the transmission holes of the floor plate 3, and protrude above the floor plate 3. The tall plate piece 13 has a portion protruding on the floor plate 3 as a cut piece 14 and a portion fitted in the transmission hole of the floor plate 3 as a cleaning piece. The length of the cleaning piece in the sludge flow downward direction is shorter than that of the permeation hole of the floor plate 3. The tall plate pieces 13 to the cut pieces 14 have a uniform horizontal interval in the transverse direction. Further, the number of parallel pieces of the cut pieces 14 in the row on the horizontal bar 12 on the downstream side of the downflow passage 1 is larger than that in the row on the horizontal bar 12 on the upstream side, and the parallel interval is narrowed.

  The remaining plate piece 13 has a low height, the upper end is inserted into the transmission hole of the floor plate 3, and does not protrude on the floor plate 3. The short plate 13 is fitted into the transmission hole of the floor plate 3 to form a cleaning piece. The length of the cleaning piece 13 in the sludge flow downward direction is shorter than that of the permeation hole of the floor plate 3.

  All the plate pieces 13, the horizontal bars 12, and the movable shaft 11 are movable along the sludge flow downward direction in a state where the plate pieces 13 are fitted in the transmission holes of the floor plate 3. The movable range is between the backward end where the plate piece 13 hits the upstream end and the rear end of the transmission hole of the floor plate 3 and the forward end where the plate piece 13 hits the downstream end and the front end of the transmission hole of the floor plate 3.

  In the movement driving device for the plate piece 13, the lower surface side of the left and right movable shafts 11 is a rack 15. Under the left and right racks 15, a rotating shaft 16 is supported along the transverse direction. Pinions 17 are fixed to the rotation shaft 16 at the left and right positions, respectively. The left and right pinions 17 mesh with the left and right racks 15, respectively. The rotating shaft 16 is connected to the electric motor 18 by a bevel gear transmission mechanism.

  An operating piece 19 is fixed to the movable shaft 11. Switches 20 and 21 are provided on the front side and the rear side of the operating piece 19, respectively. When the movable shaft 11 or the plate piece 13 is positioned at the retracted end, the operating piece 19 operates the rear switch 21 as shown in FIG. On the contrary, when it is located at the forward end, as shown in FIG. 6, the operating piece 19 operates the front switch 20.

  An electric circuit for controlling the movement of the plate piece 13 is provided. The electric circuit rotates the motor 18 to advance the plate piece 13 every time the time during which the plate piece 13 is stopped at the backward end reaches the set value, and stops the motor 18 when the front switch 20 is activated. The plate piece 13 is stopped at the forward end. Further, whenever the time during which the plate piece 13 is stopped at the forward end reaches the set value, the motor 18 is reversed to reverse the plate piece 13 and when the rear switch 21 is operated, the motor 18 is stopped. The plate piece 13 is stopped at the retracted end.

On the flow-down passage 1, a sludge flow-down speed control device that also serves as a cleaning device for the bottom plate 3 is provided.
In this apparatus, a drive shaft 31 and a driven shaft 32 are respectively supported along the transverse direction on the inlet side and the outlet side on the flow-down passage 1. The drive shaft 31 is connected to the electric motor 33 by a chain transmission mechanism. The drive shaft 31 and the driven shaft 32 each have a chain wheel 34 fixed at the left and right positions. An endless chain 35 is stretched over the left side pulley 34 of the drive shaft 31 and the driven shaft 32. An endless chain 35 is also passed over the right side wheel 34 of the drive shaft 31 and the driven shaft 32. On the left and right chains 35, a speed governing plate 36 is attached so as to extend in the transverse direction. A plurality of the governing plates 36 are projected outward in parallel at equal intervals on the outer peripheral side of the chain 35.

  The speed regulating plate 36 has a plurality of bristles protruding in parallel on a base attached to the chain 35 to form a brush. The bristles of the brush are longer than the cut pieces 14 protruding on the bottom plate 3. While the brush-like governor plate 36 is positioned below the chain 35, the brush-like governor plate 36 is fitted in the flow-down passage 1 along the transverse direction, and the end of the hair contacts the bottom plate 3. When the governor plate 36 hits the cut piece 14 protruding on the bottom plate 3, the row of hairs is pushed right and left by the cut piece 14 and passes through the cut piece 14.

  When the electric motor 33 is driven, the governor plate 36 rotates around the drive shaft 31 and reaches the lower side of the chain 35, enters the inlet of the flow-down passage 1, and fits into the flow-down passage 1. Then, in a state where the brush bristles are swept through the bottom plate 3 while being fitted in the flow down passage 1, the cut pieces 14 protruding on the bottom plate 3 are sequentially passed, and the flow down passage 1 is lowered at a set speed. When the speed control plate 36 reaches the outlet of the flow-down passage 1, it escapes from the flow-down passage 1, travels around the driven shaft 32, and reaches the upper side of the chain 35.

  In this sludge concentrator, as shown in FIG. 7, the sludge S containing floc in the liquid is supplied to the inlet of the flow-down passage 1. When the sludge S flows down the downflow passage 1, the amount of liquid separation is large in the upstream portion of the sludge S, and in the middle position of the downflow passage 1, flocs gather to form a lump as the liquid decreases. In the downstream portion of the flow-down passage 1, the floc mass flows down. The floc lump has a lower natural flow rate than the sludge S in which the floc is dispersed.

  The floc mass flowing down the flow passage 1 is pushed by the governing plate 36 moving from the upstream side to the downstream side of the flow passage 1 and flows, and is pressed against the row of the cut pieces 14 protruding on the floor plate 3. It is cut at. The floc lump pushed away by the speed control plate 36 sequentially passes through the row of the cut pieces 14 and is cut a plurality of times. As the floc mass passes through the cut piece 14, the liquid film on the outer surface of the mass is broken, and the internal floc group is cut open. The liquid on the outer surface of the mass is separated from the liquid between the inner flocs.

  Further, the brush-like governor plate 36 moves while the hair is in contact with the bottom plate 3 to clean the bottom plate 3. Further, each time the set time elapses, the plate piece 13 or the cleaning piece 13 moves forward or backward while being fitted into the transmission hole of the floor plate 3 to clean the transmission hole of the floor plate 3. The transmission hole of the floor board 3 is not clogged.

  The present invention is used for the treatment of industrial wastewater and domestic wastewater.

The schematic partial vertical side view of the sludge concentrator in embodiment of this invention. AA sectional view taken on the line AA of FIG. FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. FIG. The general | schematic partial vertical side view which shows the advance state of the board piece of the same sludge concentration apparatus, a cutting piece, and a cleaning piece. The partial fragmentary longitudinal side view which shows the use condition of the same sludge concentration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Downflow passage 2 Side wall 3 Bottom plate 4 Bottom plate wire 5 Bottom plate bar 6 Liquid chambers 11 to 21 Sludge cutting device 11 serving as a perforation hole cleaning device Movable shaft 12 Horizontal bar 13 Plate piece 13 Tall plate piece, cutting piece and cleaning Piece 13 Short plate piece, cleaning piece 14 Cutting piece 15 to 21 Plate piece movement drive device 15 Rack 16 Rotating shaft 17 Pinion 18 Electric motor 19 Actuation piece 20 Front switch 21 Rear switch 31 to 36 Also used for bottom plate cleaning device Sludge flow velocity control device 31 Drive shaft 32 Drive shaft 33 Electric motor 34 Chain wheel 35 Endless chain 36 Control plate, brush-like control plate S Sludge containing flock in liquid

Claims (6)

In a sludge concentrator with a liquid-permeable downflow passage through which sludge flows,
A flow rate control device that controls the flow rate of sludge with a governing plate that moves from the upstream side to the downstream side of the flow channel,
The downflow passage is configured to project a cut piece on the floor board and to push the sludge containing flocs on the floor board with the governing plate and cut the cut piece with the cut piece.   2. The sludge concentrator according to claim 1, wherein a plurality of the cut pieces are arranged in parallel in the transverse direction of the flow-down passage, and the number of parallel pieces is greater on the downstream side of the flow-down passage than on the upstream side.   The speed governing plate has a structure in which a large number of hairs protrude from the base into a brush shape, the hairs sweep the floor plate, and the row of hairs passes through the cut pieces on the floor plate. Sludge concentrator. The downflow passage is provided with an elongated permeation hole in the floor board, and a cleaning piece is fitted into the permeation hole,
The cleaning piece is movable along the elongated transmission hole,
The sludge concentrator according to claim 1, 2 or 3, wherein the permeation hole is cleaned by moving the cleaning piece. In the transmission hole of the floor board, penetrate the plate piece,
5. The sludge concentrator according to claim 4, wherein the plate piece is a cut piece at a portion protruding above the floor plate and a cleaning piece at a portion fitted in the permeation hole. 6. The sludge concentrator according to claim 4 , wherein the cleaning piece is configured to move forward or backward in a state of being fitted into the permeation hole and clean the permeation hole every time the set time elapses .

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