JP6399949B2 - Precipitation accelerator and sedimentation basin - Google Patents

Description

  The present invention relates to a precipitation accelerating device and a sedimentation basin suitable for use in a sedimentation basin of various water treatment facilities such as clean water, industrial water, sewage, human waste, and industrial wastewater.

  Conventionally, when a more effective precipitation effect is expected in a sedimentation basin that performs a precipitation process in various water treatment facilities, an inclined plate precipitation apparatus or an inclined pipe precipitation apparatus is generally installed. Of these, the inclined plate settling device is configured by arranging a large number of inclined plates in parallel. The floc removal capacity of the sedimentation basin is represented by the surface load factor, that is, the flow rate of the water to be treated divided by the bottom area of the sedimentation basin. The smaller this surface load factor, the better the floc removal capacity of the sedimentation basin. . That is, the larger the bottom area of the sedimentation basin, the better the floc removal ability of the sedimentation basin. And since the inclined plate sedimentation apparatus is equipped with many inclined plates as mentioned above, the bottom area of a sedimentation basin can be substantially enlarged by precipitating a floc on this inclined plate. Therefore, the inclined plate settling device can greatly improve the floc removal capability of the settling tank.

JP 2002-316003 A

  The inclined plate settling device is often used in water treatment facilities for water and industrial water, but is rarely used in water treatment facilities for sewage. This is because in the case of clean water etc., most of SS (floating matter or suspended matter) is inorganic, there is little adhesion to the inclined plate, and SS deposited on the inclined plate naturally falls relatively easily, In addition, because it is easy to wash, in the case of sewage, the sludge accumulated on the inclined plates is unlikely to fall naturally due to organic sludge. This is because a film is generated and the accumulated sludge is not as easy to clean as water.

  The present invention has been made in view of the above-mentioned points, and its purpose is not only to produce clean water but also organic sludge such as sewage. The object of the present invention is to provide a precipitation accelerating device and a sedimentation basin that can be effectively precipitated and removed by adopting such a structure.

The present invention includes an inclined body that is inclined with respect to a horizontal plane, and precipitates in water to be treated are settled on the inclined surface of the inclined body, and further the sedimented sediment is along the inclined surface. A precipitation accelerating device for dropping downward, wherein the inclined body is configured to be flexible so that the inclined surface swings or vibrates , and the inclined body is always or at a predetermined timing. Sometimes it is installed in a relaxed state .
Since the inclined body has flexibility, it is oscillated or vibrated by external force (aeration from the lower part, flow of water to be treated, various vibrations, etc.), and this facilitates the separation of the sediment that has settled on the inclined surface. . For this reason, even if the sediment deposited on the sloping surface is organic sludge such as sewage, the sediment is easy to peel off, naturally falls from the sloping surface, and the generation of biofilm is also suppressed. It is possible to effectively remove the precipitate. The inclined body is preferably a sheet-shaped inclined sheet, but may be a tubular inclined tube. Further, it is preferable that a plurality of the sheet-like inclined bodies are provided, and these are arranged side by side with a predetermined interval in the vertical direction (and in the horizontal direction and the depth direction).

By loosening the or inclination italic, it can dramatically increase the rocking or vibration of the tilting member such as by vibration air diffuser and the water to be treated flows and various from the bottom. As a result, the action and effect of the flexible inclined body can be greatly improved, and the separation of the precipitate deposited on the inclined surface can be dramatically improved. For this reason, even if the precipitate is a precipitate that is difficult to remove, such as organic sludge, it can be peeled off and can be effectively removed from the inclined surface. Accordingly, not only precipitates centered on inorganic substances such as tap water but also precipitates centered on organic substances such as sewage can be accommodated. The inclined body can be slackened at all times, but may be slackened at a predetermined timing. For example, when a precipitate is deposited on the inclined body, the inclined body may be in a tensioned state and may be loosened when washing is performed.

Further, the present invention is characterized in that an air diffuser is provided on the lower side of the inclined body so that bubbles are brought into contact with the lower surface of the inclined body to swing the inclined body.
The bubbles that are in contact with the lower surface of the inclined body rise obliquely upward along the lower surface of the inclined surface, but the inclined body shakes at that time. Especially when the slanted body is slackened, the amount of shaking is large, and even if the deposited sediment is difficult to remove, such as organic sludge, it can be separated effectively. It can be removed from the surface.

Further, the present invention is characterized in that an inclined body tensioning means for pulling out the slanted inclined body to remove the deposit on the inclined surface is provided.
This makes it possible to easily peel off deposits that are difficult to peel off from the inclined surface even when the tilting body swings, and to effectively precipitate, peel, and remove precipitates that are difficult to remove. Can proceed.

Further, the present invention is characterized in that an inclined body vibration means for vibrating the inclined body to wipe off the deposit on the inclined surface is provided.
An effective vibration can be applied to the inclined body, so that the sediment that is difficult to peel off from the inclined surface can be easily peeled off and removed, and more effectively, the sediment that is difficult to remove can be removed. Precipitation / peeling / removal can proceed.

  The settling basin according to the present invention is characterized in that the settling accelerator is installed in water to be treated.

  According to the present invention, not only clean water etc. but also organic sludge such as sewage can be effectively precipitated and removed.

It is a schematic sectional side view which shows an example of the sedimentation basin 100 which installed the precipitation acceleration apparatus 1. FIG. It is a schematic perspective view which shows the structure (the part) of the precipitation promoting apparatus. It is a schematic perspective view which simplifies the precipitation acceleration apparatus 1 and shows the one part. It is a schematic perspective view which shows the frame structure of the precipitation acceleration apparatus 1 shown in FIG. It is operation | movement explanatory drawing of the precipitation promotion apparatus 1, FIG. 5 (a) is a side view (figure seen from the arrow A1 direction) of the precipitation promotion apparatus 1 shown in FIG. 3, FIG.5 (b) is the precipitation promotion shown in FIG. 2 is a front view of the device 1 (viewed from the direction of arrow A2). FIG. It is a figure which shows an example of the precipitation acceleration apparatus 1-2. It is a figure which shows an example of the precipitation acceleration | stimulation apparatus 1-3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional side view showing an example of a sedimentation basin 100 in which a sedimentation promotion apparatus 1 according to an embodiment of the present invention is installed. In water treatment facilities such as sewage treatment facilities, the first sedimentation basin for sinking fine dirt in the treated water to the bottom, and the final sedimentation basin for sinking activated sludge in the treated water after being decomposed by microorganisms to the bottom Etc. are used, and the sedimentation promotion apparatus 1 shown in FIG. 1 is used for these sedimentation basins 100. The sedimentation basin 100 has a horizontally long structure in order to prevent drift of the water to be treated 101 in the pond and to impart straightness to the flow of the water to be treated 101. In the vicinity of the center in the sedimentation basin 100, the sedimentation promotion apparatus 1 according to the present embodiment is installed. The sedimentation basin 100 shown in FIG. 1 is a typical lateral flow sedimentation basin, and the water flow at this time is in the horizontal (horizontal) direction, but as shown by the dotted line in FIG. By installing a shielding plate 103 that closes the upper half of the sedimentation basin 100 immediately before 1, an upward flow sedimentation basin in which the flow of water to the sedimentation promotion device 1 is directed upward from the bottom to the top is also possible. good. In the following description, the sedimentation basin 100 is mainly described as a cross-flow sedimentation basin (without the shielding plate 103). In addition, it goes without saying that various changes can be made to the structure of the sedimentation basin 100, and the present invention may be applied to cross-flow sedimentation basins and longitudinal flow sedimentation basins having various configurations other than those shown in the drawings.

  FIG. 2 is a schematic perspective view showing the structure (a part thereof) of the precipitation promoting device 1. As shown in FIG. 1, the precipitation accelerating device 1 is configured by arranging a large number (several sheets) of sheet-like inclined bodies (inclined sheets) 10 that are inclined obliquely, vertically and horizontally. A diffuser 50 for discharging bubbles is installed below the inclined body 10. In the figure, two sets of units each having a plurality of inclined bodies 10 arranged vertically in the same inclination direction are arranged vertically and horizontally, but the basic structure is one unit surrounded by a dotted line in which a large number of inclined bodies 10 are provided. In the case where the water depth of the sedimentation basin 100 is deep, the above units are arranged in multiple stages (not limited to 2) in the height direction, whereas when the horizontal width of the sedimentation basin 100 is wide, the unit Are arranged in a horizontal direction (not limited to two). When the units are arranged in multiple stages in the height direction, the inclination direction of the inclined body 10 installed on the lower side and the inclination direction of the inclined body 10 installed on the upper side are reversed. That is, the inclined body 10 having a multi-layer structure is arranged in a zigzag shape (sawtooth shape) alternately in the vertical direction so that air diffused from the lower side is moved to one side. The cleaning effect is spread throughout. However, in some cases, it is not always necessary to arrange them in a zigzag shape. Moreover, the clearance gap between each inclined body 10 is comprised so that to-be-processed water can pass smoothly toward the horizontal direction (horizontal direction, the flow direction of water) S. FIG. In addition, in the case of an upflow type sedimentation basin, it goes without saying that it is not necessary to configure the gap between the inclined bodies 10 so that the water to be treated can smoothly pass in the lateral direction S.

  The treated water 101 introduced into the sedimentation basin 100 from the inflow side C1 in FIG. 1 flows through the sedimentation basin 100 toward the downstream side. Precipitates with a high sedimentation rate settle directly to the bottom of the sedimentation basin before flowing into the sedimentation accelerator 1, but sediments with a low sedimentation rate flow into the sedimentation accelerator 1, and the surface of each inclined body 10 ( Sloped on 11). The sediment deposited on the inclined surface 11 slides down on the inclined surface 11 and settles on the bottom of the sedimentation basin 100. The sediment deposited on the bottom of the sedimentation basin 100 is discharged out of the sedimentation basin 100 by a mud discharge device (not shown). On the other hand, the water to be treated 101 from which the sediment has been removed is discharged from the outflow side C2 to the outside of the sedimentation basin 100 and proceeds to the next step.

  FIG. 3 is a schematic perspective view showing a part of the precipitation accelerating device 1 in a simplified manner, and FIG. 4 is a schematic perspective view showing a holding frame 30 which is a framework structure thereof. In FIG. 3, the outer frame 31 described below in the holding frame 30 is indicated by a dotted line for convenience of illustration. The sedimentation promoting apparatus 1 shown in FIG. 3 shows two inclined bodies 10 in the depth direction, while the precipitation promoting apparatus 1 shown in FIG. 2 shows one inclined body 10 in the depth direction. The described states of the inclined body 10 in FIGS. 3 and 4 and the inclined body 10 in FIG. 2 are different. 3 and 4, a double structure is used in the depth direction, but in practice, one or three or more may be used as necessary. Similarly, it may be multistage in the vertical direction.

  As shown in FIG. 4, the holding frame 30 of the precipitation accelerating device 1 includes an outer frame 31 assembled in a rectangular parallelepiped shape, and three parallel surfaces (water flow S) at the left and right ends and the center formed by the outer frame 31. A plurality of (six each) inclined body holding frames 33 that are obliquely attached at equal intervals in a plane perpendicular to the surface). The holding frame 30 is made of a hard member such as a metal, but may instead be made of a flexible member such as a rope. Each inclined body holding frame 33 is arranged in parallel at equal intervals with a predetermined inclination angle (θ = 45 ° to 80 °, preferably 60 °) with respect to the horizontal direction.

  Then, as shown in FIG. 3, each of the three inclined body holding frames 33 arranged at the same position in the direction of the water flow S is a long belt-like inclined body (one sheet). An inclined sheet) 10 is installed over the bridge. Each inclined body 10 is composed of a flexible sheet, for example, various resin sheets such as a fluororesin sheet (or a fluororesin-coated sheet) having a smooth surface and a soft polyvinyl chloride sheet, a woven fabric, and a rubber sheet. Etc. are constituted. Each inclined body 10 is attached to the inclined body holding frame 33 at both ends and a central portion thereof. At that time, each inclined body 10 is in a state of being loosened between the adjacent inclined body holding frames 33 that are spanned. The slack is not particularly defined, but is desirably about 5% to 30% of the support length (the length between adjacent inclined body holding frames 33). Further, the horizontal gap between adjacent inclined bodies 10 (that is, the horizontal interval between adjacent inclined body holding frames 33) L1 is, for example, about 100 mm (50 to 200 mm, preferably 75 to 150 mm).

  Below the inclined body 10 and the inclined body holding frame 30, an air diffuser (aeration means) 50 is installed. The air diffusion device 50 is configured by providing a plurality of air diffusion holes 53 in the longitudinal direction of the pipe 51. As shown in FIG. 1, the air diffuser 50 is connected to an air blower 55, and air is diffused from each air diffuser 53 by driving the air blower 55. Each pipe 51 is preferably installed at least in the lower part of the lowermost inclined body 10, and may be installed between a plurality of inclined bodies 10 that are not shown in the drawing but are vertically arranged. Note that the air diffuser is not limited to the above-described air diffuser having a pipe structure, and may have any configuration as long as it is a device that can diffuse air (particularly, a device that can uniformly diffuse the entire air).

  Next, the operation of the precipitation promoting device 1 will be described. As described above, in the sedimentation basin 100 shown in FIG. 1, the treated water 101 introduced into the sedimentation basin 100 from the inflow side C1 flows in the sedimentation basin 100 toward the downstream side as shown in FIG. 3 flows into the gaps between the inclined bodies 10 of the precipitation promoting apparatus 1 shown in FIG. 3, and the precipitate in the water 101 to be treated is deposited on the surfaces (inclined surfaces 11) of the inclined bodies 10. The sediment deposited on the inclined surface 11 slides down on the inclined surface 11 and settles on the bottom of the sedimentation basin 100, but a part of the sediment accumulates on the inclined surface 11 and falls naturally. do not do. On the other hand, air is diffused from each air diffuser 53 by driving the blower 55 periodically (for example, 10 minutes / 1 day).

  FIG. 5 is a diagram for explaining the operation of the precipitation accelerating device 1. FIG. 5 (a) is a side view of the precipitation accelerating device 1 shown in FIG. 3 (viewed from the direction of arrow A1), and FIG. It is a front view (figure seen from arrow A2 direction) of the precipitation promoting apparatus 1 shown. As shown in these drawings, when air is diffused from below the inclined body 10, the rising bubbles come into contact with the lower surface of the inclined body 10 and rise upward obliquely while being along the lower surface. At this time, the slanted body 10 having flexibility and slack is easily pushed up by the bubbles and swings. When the tilting body 10 swings in this way, peeling of the sediment that has settled and deposited on the tilted surface 11 of the tilting body 10 is strongly urged. For this reason, even if the deposited sediment is organic sludge such as sewage, the sediment is peeled off, naturally falls from the inclined surface 11, and the generation of a biofilm is suppressed. Objects can be effectively removed. In practice, as shown in FIG. 2, since the inclined body 10 is installed in a zigzag manner in the vertical direction, the bubbles also rise in a zigzag manner while abutting against the lower surface of the inclined body 10, and the upper and lower inclined bodies 10. Swing in order. On the contrary, the sludge separated from the inclined body 10 descends zigzag along the upper surfaces of the upper and lower inclined bodies 10 and reaches the bottom of the sedimentation basin 100. In addition, since the inclined body 10 gently flutters with the flow of the water 101 to be treated, deposits are not easily deposited on the inclined surface 11 of the inclined body 10 from this point.

  In addition, this invention can be comprised even if the said inclination body 10 is not slackened. That is, the inclined body 10 may be installed in a state where it is stretched between adjacent inclined body holding frames 33. This is because even with this configuration, the inclined body 10 can be swung by the contact of bubbles and the flow of the water 101 to be treated. However, if the inclined body 10 is slackened as in the above embodiment, the swing of the inclined body 10 can be greatly increased by the diffused air from the lower part or the flow of the water 101 to be treated. Therefore, the action / effect of the flexible inclined body 10 can be greatly improved, and the separation of the sediment deposited on the inclined surface 11 can be greatly improved. For this reason, even if the deposited deposit is a deposit that is difficult to remove, such as organic sludge, it can be removed, and the deposit can be removed more effectively. Therefore, not only precipitates centered on inorganic substances such as tap water but also precipitates centered on organic substances such as sewage can be effectively promoted.

  FIG. 6 is a view showing an example of the precipitation promoting device 1-2 according to another embodiment, and shows a portion corresponding to FIG. 5B. In the precipitation accelerating device 1-2 shown in the figure, the same or corresponding parts as those in the precipitation accelerating device 1 shown in FIGS. Note that matters other than those described below are the same as those in the embodiment shown in FIGS. As shown in the figure, in this precipitation accelerating device 1-2, an inclined body tensioning device (inclined body tensioning means) 60 is installed instead of installing the air diffuser 50. The inclined body tensioning device 60 is attached to one end of each elongated belt-like inclined body 10 and has a function of pulling each inclined body 10 outward (in the direction of arrow E). As the structure of the inclined body tensioning device 60, devices of various structures such as a hydraulic type, an air type, an electromagnetic type, a cam type, and a spring type can be considered. When the slant body tensioning device 60 is driven, the slant body 10 is pulled to the slant body tensioning device 60 side and the slanted body 10 is slackened by being pulled up in the direction of arrow F, and moves to the position indicated by the dotted line in FIG. To do. When the inclined body tensioning device 60 is returned to the original position, the inclined body 10 also returns to the original slack state.

  In a state in which a predetermined amount of deposit has accumulated on the inclined surface 11 of the inclined body 10 (for example, after one day has passed since the previous driving), the inclined body tensioning device 60 is driven a plurality of times, for example, every few seconds, and the inclined body is slackened. Tension 10 The deposit deposited on the inclined surface 11 of the inclined body 10 is peeled off by the impact due to the tension. For this reason, the sediment that is difficult to peel off from the inclined surface 11 only by swinging the inclined body 10 can be easily peeled off and removed, and more effectively, the sediment that is difficult to remove. Precipitation / peeling / removal can proceed. Instead of directly pulling the tilted body 10 as in the tilted body tensioning device 60, the tilted body tensioning device is attached so as to pull the tilted body holding frame 33 to which the tilted body 10 is attached outward. You may comprise so that it may be tense.

  FIG. 7 is a view showing an example of the precipitation accelerating device 1-3 according to still another embodiment, and shows a portion corresponding to FIG. 5B. In the precipitation accelerating device 1-3 shown in the figure, the same or corresponding parts as those in the precipitation accelerating device 1 shown in FIGS. Note that matters other than those described below are the same as those in the embodiment shown in FIGS. As shown in the figure, this precipitation accelerating device 1-3 is provided with an inclined body vibration device (inclined body vibration means) 70 instead of installing the diffuser device 50 and the inclined body tension device 60. The inclined body vibration device 70 is attached to one end side of each elongated belt-like inclined body 10 and has a function of vibrating each inclined body 10 in the longitudinal direction (arrow G direction). As the structure of the inclined body vibration device 70, devices having various structures such as an electric type and a cam type can be considered. When the inclined body vibration device 70 is driven to vibrate the inclined body 10, the inclined body 10 vibrates in the longitudinal direction as indicated by an arrow H in FIG.

  In a state where a predetermined amount of deposit is deposited on the inclined surface 11 of the inclined body 10 (for example, after one day has passed since the previous driving), the inclined body vibration device 70 is driven to vibrate. By this vibration, the deposits deposited on the inclined surface 11 of the inclined body 10 are peeled off. For this reason, even a sediment that is difficult to peel off from the inclined surface 11 only by swinging the inclined body 10 can be easily peeled off and deposited, and more effectively, precipitation of a precipitate that is difficult to remove.・ Peeling and removal can proceed. In this example, the inclined body vibration device 70 is attached to the inclined body 10, but the inclined body vibration device 70 may be installed in the holding frame 30 so that the vibration of the holding frame 30 is conducted to the inclined body 10. .

  The diffuser 50, the inclined body tensioning device 60, and the inclined body vibrating device 70 described above may be used in combination. For example, during normal operation, the slant body 10 is swung using the air diffuser 50 to prevent deposits from accumulating on the inclined surface 11, and deposits still form and cannot be removed only by aeration. In such a case, the slant body tensioning device 60 or the slant body vibration device 70 may be driven to peel off the deposit and to be removed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above embodiment, a belt-like sheet is used as the inclined body, but the sheet may have a shape other than the belt-like shape (for example, a polygonal shape or a circular shape). Further, in the above embodiment, a plurality of inclined bodies are separated at a predetermined interval and provided side by side in the vertical and horizontal directions and the depth method. However, in some cases, a single precipitation body is provided to configure the precipitation promoting device. May be. Various changes can be made to the shape and structure of the holding frame, which is a frame structure.

  Moreover, in the said embodiment, although the inclination sheet | seat was shown as an inclination body, you may comprise with an inclination pipe | tube instead. In other words, for example, an inclined tube assembly having flexibility may be replaced with the inclined sheet by installing it with a slack. In short, any structure may be used as long as it is flexible and has a structure in which the inclined surface swings or vibrates.

1 Precipitation accelerator 10 Inclined body (inclined sheet)
11 Inclined surface 30 Holding frame 50 Air diffuser (air diffuser)
100 Sedimentation basin (sedimentation tank)
101 Water to be treated 1-2 Precipitation accelerator 60 Inclined body tension device (Inclined body tension means)
1-3 Precipitation accelerator 70 Inclined body vibration device (Inclined body vibration means)
10-2 Inclined body (inclined tube)

Claims (6)

It has an inclined body that is installed inclined with respect to a horizontal plane, and precipitates in the water to be treated are allowed to settle on the inclined surface of the inclined body, and further, the settled precipitates are dropped downward along the inclined surface. A precipitation accelerator,
The inclined body has a structure in which the inclined surface swings or vibrates by having flexibility ,
Furthermore, the inclined body is installed in a relaxed state at all times or at a predetermined timing . The precipitation accelerating device according to claim 1,
2. The precipitation promoting device according to claim 1, wherein the inclined body has a sheet shape. The precipitation accelerating device according to claim 1 or 2 ,
A sedimentation accelerating device characterized in that an air diffuser for swinging the inclined body by causing bubbles to contact the lower surface of the inclined body is provided below the inclined body. The precipitation accelerating device according to claim 1 or 2 ,
An apparatus for accelerating precipitation characterized in that an inclined body tensioning means is provided for pulling the slanted inclined body to remove the deposit on the inclined surface. The precipitation accelerating device according to claim 1 or 2 ,
An apparatus for accelerating precipitation characterized by comprising an inclined body vibration means for vibrating the inclined body to remove the deposit on the inclined surface. A sedimentation basin characterized in that the sedimentation accelerating device according to any one of claims 1 to 5 is installed in treated water.

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