JP3207672B2 - Sewage treatment tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment tank. More specifically, the present invention relates to a sewage treatment tank capable of improving the workability of a lower holding plate and stably supporting and fixing a filter medium in a treatment chamber with sufficient strength.

[0002]

2. Description of the Related Art Conventionally, for example, a purifying device as shown in FIG. 12 has been used as a device for purifying sewage from toilets, kitchens, baths and the like. This purification apparatus has a processing tank main body (A), and a plurality of processing chambers are formed by a partition plate (A). The sewage is introduced from an inflow port (c) provided in the processing tank body (a), purified by passing through each processing chamber, and discharged from an outflow port (d).

In the treatment tank body (A), from the inlet (C) side to the outlet (D) side, the first anaerobic filter tank is provided.
The chamber (e), the anaerobic filter bed second chamber (f), the contact aeration tank (g), the settling tank (h), and the disinfecting tank (g) are sequentially arranged. The anaerobic filter tank 1st chamber (E) and the anaerobic filter tank 2nd chamber (F) are filled with filter medium (K), and the solids and impurities contained in the sewage are hooked on this filter medium (K). The solids and the like that have been removed are stored in a filter bed, and at the same time, the organic substances are separated and stabilized and reduced in the presence of anaerobic bacteria attached to the surface of the filter medium (co). ,Purify.

[0004] Such a filter medium (U) is composed of a single body having a large surface area such as a cylindrical shape or a spherical shape, and a large number of them are the first chamber (E) of the anaerobic filter bed tank and the second chamber (F) of the anaerobic filter bed tank. Is filled. In addition, as illustrated in FIG.
In the first anaerobic filter tank (e) and the second chamber (f) of the anaerobic filter tank, two holding plates, that is, an upper holding plate (sa) and a lower holding plate (shi), are in the middle of the flow of sewage. It is fixed so that it does not drop to the bottom or float on the surface of sewage.

[0005] The use of the sewage treatment tank causes sewage dust and sludge to adhere to the filter medium (K), so that a large weight is applied to the lower holding plate (S). Particularly, for cleaning the sewage treatment tank, the first anaerobic filter tank (E) and the second anaerobic filter tank are used.
When the water inside the chamber (f) is drained, the buoyancy does not work, so that the weight of the lower holding plate (f) supporting the filter medium (f) from below becomes large. For this reason, the lower holding plate (S) is required to have sufficient strength to withstand such a weight. Therefore, conventionally, a holding plate (s) as illustrated in FIG. 13 is used.

The holding plate (s) is made of steel so as to obtain sufficient strength, and an angle (s) as a frame, a vertical lattice (s) and a horizontal lattice (s) are combined, and an opening ( And (h) are formed.

[0007]

However, for example, in the conventional holding plate (s) shown in FIG.
The angle (se) and the lattice part (tsu) are formed as separate bodies, and when the holding plate (su) is formed, it is necessary to connect them by riveting or the like. For this reason, the workability of the conventional holding plate has been a problem.

In addition, in consideration of the weight and the like of the filter medium (co), there is also a restriction that the thickness of the holding plate (s) must be about 10 mm in order to obtain sufficient strength. The present invention has been made in view of the above circumstances, eliminates the drawbacks of the conventional sewage treatment tank, improves the workability of the lower holding plate, and stably supplies the filter medium with sufficient strength in the treatment chamber. It is an object of the present invention to provide a sewage treatment tank that can be supported and fixed.

[0009]

In order to solve the above-mentioned problem, the present invention has a processing chamber filled with a filter medium, and the filter medium is supported and fixed in the processing chamber by two upper and lower holding plates. In the sewage treatment tank, the lower holding plate that supports the filter medium from below is made of resin, and the holding plate has a frame portion,
A lattice portion having a plurality of openings formed therein is integrally formed with the frame portion, and a projection protruding downward is formed at each of the lower end portions of the frame portion and the lattice portion, and a U-shape is formed. It has a cross section of a mold, and furthermore, at the bottom of the processing chamber, a receiving gantry composed of a vertical bar and a horizontal bar is arranged, and the upper portion of this receiving gantry is inserted between the ridges at the lower end of the lower holding plate, Provided is a sewage treatment tank characterized in that a holding plate is supported in a treatment chamber.

In a preferred embodiment of the present invention, an engaging portion protruding upward is provided on the bottom surface of the processing chamber, and the lower end of the vertical bar of the cradle is inserted into the engaging portion. Further, in the present invention, the upper holding plate for supporting the filter medium from above is also made of resin, and this holding plate has a frame portion, and a lattice portion having a plurality of openings formed therein is integrally formed with the frame portion. While being formed, a bar member that comes into contact with the bar member is laid over the upper surface thereof in the direction of the lattice portion. The bar member has a hollow first bar member and a second bar member inserted therein. In addition, it is also a preferable embodiment to be able to expand and contract in the lattice portion direction.

[0011]

In the sewage treatment tank of the present invention, the lower holding plate for supporting the filter medium from below is made of resin, and this holding plate has a frame portion and a lattice portion having a plurality of openings formed therein. Are formed integrally with the frame portion, and at each of the lower end portions of the frame portion and the lattice portion, a protruding ridge is formed, which has a U-shaped cross section, and is further provided at the bottom of the processing chamber. Arrange a receiving stand composed of vertical and horizontal bars, insert the upper part of this receiving stand between the ridges at the lower end of the lower holding plate, and support the lower holding plate in the processing chamber. There is no need to assemble, and the workability can be improved. Further, the lower holding plate can be provided with strength by the ridges without increasing the plate thickness, and is further supported by the receiving cradle from below, so that sufficient strength is realized. The cradle is
Since the upper part is inserted between the ridges at the lower end of the lower holding plate, it is not deformed and tilted due to the weight of the filter medium. can do.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewage treatment tank according to the present invention. FIG.
It is the fragmentary sectional view which showed one example of the sewage treatment tank of this invention. The sewage treatment tank illustrated in FIG. 1 has a treatment tank main body (1) and a plurality of treatment chambers are formed by a partition plate (2), similarly to a conventional sewage treatment tank. FIG. 1 exemplifies the first anaerobic filter tank (3) of the sewage treatment tank, and the second anaerobic filter tank adjacent to the partition (2) is also shown below. A similar configuration can be adopted.

[0013] A filter medium (4) for hooking solids and contaminants such as garbage and sludge in the sewage to a portion corresponding to the middle of the flow of the sewage in the first chamber (3) of the anaerobic filter bed tank (4). Are filled in large numbers. In the example of FIG. 1, the filter medium (4) has a cylindrical shape, but the shape is not particularly limited, and it is sufficient that the filter medium (4) has a sufficient surface area for separating and removing solids and impurities. , A sphere or the like.

The filter medium (4) is supported and fixed to the above-mentioned portion by two upper and lower holding plates, that is, an upper holding plate (5) and a lower holding plate (6). Both of the holding plates (5) and (6) are formed of a resin such as vinyl chloride. In the example of FIG. 1, a cradle (9) composed of a vertical bar (7) and a horizontal bar (8) is disposed at the bottom of the first chamber (3) of the anaerobic filter tank. The lower holding plate (6) is supported by the receiving base (9).

FIG. 2 is an AA plan view of FIG. As illustrated in FIG. 2, the lower support plate (6) is
0) and a lattice portion (11) therein. The grid section (11) includes a plurality of orthogonal vertical grids (1
2) and a horizontal grid (13).
2) An opening (14) is formed by (13). The opening (14) is provided with the filter medium (4) illustrated in FIG.
The size of the sewage is such that the sewage does not fall off, and the treated sewage can pass through. Each of the frame portion (10) and the lattice portion (11) is made of a resin such as vinyl chloride as described above, and is formed as an integral body. Therefore, when the lower holding plate (6) is formed as in the conventional case, the frame (10) and the grid (11) are used.
Is not required to be fixed by screws or the like, and time and labor are not required, so that the workability of the lower holding plate (6) is extremely good.

Further, as illustrated in detail in the partial perspective view of FIG. 3, each of the frame portion (10) of the lower holding plate (6) and the lower end portion of the lattice portion (11) has a protruding ridge ( 15) is formed and has a U-shaped cross section. As illustrated in FIG.
Between 5), the upper part of the receiving base (9) illustrated in FIG. 1 is inserted. In addition, the lower holding plate (6) can have sufficient downward bending strength even if the lower holding plate (6) is thin due to the presence of the ridge (15).

FIG. 4 is a perspective view showing an example of the receiving stand. For example, as exemplified in FIG. 4, the cradle (9) is assembled from a vertical bar (7) and a horizontal bar (8). The unit constituted by the vertical bar (7) and the horizontal bar (8) connected thereto is interconnected by another horizontal bar (8a). The material of the vertical bar (7) and the horizontal bars (8) (8a) is not particularly limited, and may be any suitable material such as a metal, an alloy, and a resin. In addition, the shape can be arbitrary, and for example, can be a hollow cylindrical shape.

For example, by using the lower holding plate (6) and the cradle (9) shown in FIGS. 3 and 4, the lower holding plate is made of steel as in the prior art, and sufficient strength can be obtained without increasing the thickness. Filter media (4) that can be realized and illustrated in FIG.
Can be supported from below in the middle of the flow of sewage in the first chamber (3) of the anaerobic filter tank. The lower holding plate (6) can be made thin. In addition, as illustrated in FIG. 3, the upper portion of the receiving gantry (9) is inserted between the ridges (15) of the lower holding plate (6), so that as illustrated in FIG. The first chamber (3) of the anaerobic filter tank for cleaning the sewage treatment tank without being deformed and tilting due to weight
Even when water is drained from the cradle, it is possible to prevent the receiving stand (9) from falling down. Since the lower holding plate (6) is normally fixed to the outer wall of the processing tank or the like, it does not move and can stably support the filter medium (4) together with the receiving gantry (9) in the processing chamber.

The thickness of the vertical bar (7) and the horizontal bars (8) and (8a) of the receiving stand (9) may vary depending on the strength and the like. Is
The distance between the ridges (15) into which only the horizontal bars (8) and (8a) are inserted may be adjusted according to the thickness. In addition, the opening (14) may be omitted in the portion facing the horizontal bar (8a), as illustrated in FIG.
Of course, the opening (14) may be formed.

FIGS. 6A and 6B are enlarged cross-sectional views of the solid circle in FIG. As shown in these examples, the receiving pedestal (9) can be engaged with the processing chamber bottom portion (16), and its movement can be disabled. That is, as illustrated in FIG. 6A, a pin (17) projecting upward is provided on the bottom portion (16) of the processing chamber, and the inside of the vertical bar (7) of the receiving base (9) having a hollow lower end is provided. The pin (17) can be inserted and engaged.

As shown in FIG. 6B, a protrusion (18) is provided on the bottom surface (16) of the processing chamber so as to protrude upward, and a recess (19) is formed in the protrusion (18). The lower end of the vertical bar (7) may be inserted into the recess (19) and engaged therewith. In this case, the lower end of the vertical bar (7) does not have to be hollow. As described above, by inserting the lower end of the vertical bar (7) of the receiving gantry (9) into the pin (17) or the recess (18), the receiving gantry (9) is moved to a predetermined position on the bottom surface (16) of the processing chamber. The position can be positioned at the position, and the lateral displacement and fall of the receiving base (9) due to the weight of the filter medium (4) as illustrated in FIG. 5 can be more reliably prevented. The receiving stand (9) can firmly receive the weight of the upper portion and stably hold the filter medium (4) together with the lower holding plate (6) in the middle of the flow of the sewage in the processing chamber.

FIG. 7 is a plan view showing an example of the upper holding plate of FIG. In the example of FIG. 7, similarly to the lower holding plate (6) illustrated in FIG. 2, the upper holding plate (5) includes a frame portion (20) and a lattice portion (21) therein. . The grid portion (21) includes a plurality of orthogonal vertical grids (22) and horizontal grids (23), and the grids (22) and (23) form an opening (24). This opening (24) is also the filter medium (4) illustrated in FIG.
The size is such that it does not fall out, and it allows sewage to pass through. Both the frame part (20) and the lattice part (21) are made of a resin such as vinyl chloride as described above, and are formed as an integral body. For this reason, similarly to the lower holding plate (6) illustrated in FIG. 2, its production is simple and easy, and the workability is excellent.

In this embodiment, the upper holding plate (5)
The two bar members (25) that come into contact with it are laid over the upper surface of the vertical lattice (22). This rod member (2
5) is for preventing the filter medium (4) illustrated in FIG. 1 from floating together with the upper holding plate (5) due to gas generated at the time of sewage purification. The number of the rod members (25) is not particularly limited, and may be an appropriate number according to the size of the processing chamber and the like.

FIG. 8 is a perspective view of a main part of the example of FIG. As illustrated in FIG. 8, the end of the rod member (25) is fixed to the rib (26) of the processing tank body (1) illustrated in FIG. 7 by a connecting member (27) such as a bolt. . Further, as shown in FIG. 9, a partially cut-away sectional view of the rod member (25), the rod member (25) is a hollow cylindrical first rod member (25a) and the first rod member (25a). ) Has a hollow cylindrical second rod member (25b) inserted inside. These rod members (25a) and (25b) are both movable in the direction of the arrow shown in the drawing, and as a result, the length of the rod member (25) is increased or decreased in the direction of the vertical lattice (22) illustrated in FIG. Is possible. Further, the length is adjusted so that the second rod member (25b) does not come off from the first rod member (25a). By doing so, the width of the processing tank body (1) shown in FIG. 7 becomes wider or narrower due to the level of sewage introduced into the processing chamber and the earth pressure at the site where the processing tank is buried being applied from the surroundings. Thus, the stress applied to the bar member (25) can be reduced. This can prevent damage to the bar member (25) caused by the application of such stress, damage to the fixed end of the bar member (25) illustrated in FIG. 8, and the like.

FIG. 10 is a partial sectional view showing the vicinity of the sedimentation tank of the sewage treatment tank of the present invention. For example, as exemplified in FIG. 10, the sewage treatment tank includes a contact aeration tank (28) adjacent to the anaerobic filter bed first chamber (3) and the second chamber.
And a sedimentation tank (29) are sequentially formed. This FIG.
In the example of (3), the inclined surface (3
0) is provided, and the inclined surface (30) is supported and reinforced by the support rib (31) from the outer wall of the processing tank body (1). This effectively prevents sludge from accumulating in the lower part of the sedimentation tank (29) even when the swirling flow of the wastewater by the circulation plate (32) inserted into the sedimentation tank (29) is slow. And more sludge can be returned to the contact aeration tank (28) again.

Conventionally, the bottom of the sedimentation tank (32) is flattened as shown in FIG. 11 because water pressure is applied. In this case, when the swirling flow of the wastewater is slow, the sludge is settled. The sludge stays at the bottom of the tank (32), and as a result, the sludge stays as a scum and floats up to the surface of the water. Such a problem is surely solved by the above configuration. Moreover, the support rib (31) illustrated in FIG. 10 is effective for preventing deformation of the processing tank main body (1) due to water pressure and improving strength.
The provision of the inclined surface (30) is also useful for preventing the treatment tank body (1) from falling over.

Of course, the present invention is not limited by the above examples. It goes without saying that various aspects are possible for details such as the structure and shape of the upper and lower holding plates, the material, size and shape of the filter medium.

[0028]

As described above in detail, according to the present invention, the workability of the lower holding plate is improved, and the filter medium can be stably supported and fixed in the processing chamber with sufficient strength. When an engaging portion is provided at the bottom of the processing chamber, and the lower end of the vertical bar of the receiving gantry is inserted into the engaging portion, the positioning of the receiving gantry is facilitated, and the deformation of the receiving gantry due to the weight of the filter medium is prevented. Can be stably supported from below.

Further, when the upper holding plate is made of an integral resin material, the workability of the upper holding plate can be improved, and the rod member that comes into contact with the upper surface can be made to expand and contract. In addition, even if the treatment tank body is deformed by water pressure or earth pressure, breakage of the rod member can be prevented, and the filter medium can be supported and fixed more stably.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a sewage treatment tank of the present invention.

FIG. 2 is an AA plan view of FIG.

FIG. 3 is a partial perspective view of a lower holding plate of FIG. 2;

FIG. 4 is a perspective view showing an example of a receiving gantry.

FIG. 5 is a cross-sectional view assuming a state of a receiving gantry.

FIGS. 6A and 6B are enlarged cross-sectional views each showing the inside of a circle in FIG. 1;

FIG. 7 is a plan view showing an example of an upper holding plate of FIG. 1;

FIG. 8 is a perspective view of a main part of the example of FIG. 7;

FIG. 9 is a partially cutaway sectional view of a rod member.

FIG. 10 is a partial sectional view showing the vicinity of a sedimentation tank of the sewage treatment tank of the present invention.

FIG. 11 is a partial sectional view showing a conventional sewage treatment tank.

FIG. 12 is a cross-sectional view showing a conventional sewage treatment tank.

FIG. 13 is a plan view showing a conventional holding plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing tank main body 2 Partition plate 3 Anaerobic filter bed first chamber 4 Filter medium 5 Upper holding plate 6 Lower holding plate 7 Vertical bar 8, 8a Horizontal bar 9 Receiving stand 10 Frame part 11 Grid part 12 Vertical lattice 13 Horizontal lattice 14 Opening Part 15 Protrusion 16 Processing chamber bottom 17 Pin 18 Protrusion 19 Concave 20 Frame 21 Lattice 22 Vertical lattice 23 Horizontal lattice 24 Opening 25, 25a, 25b Bar member 26 Rib portion 27 Fixing member 28 Contact aeration tank 29 sedimentation tank 30 slope 31 support rib 32 flow plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-222777 (JP, A) JP-A-6-3498 (JP, U) JP-A-4-1344491 (JP, U) JP-A-4-134 78998 (JP, U) Fully open 1986-171598 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 3/00 C02F 3/02-3/10

Claims (3)

(57) [Claims] 1. A sewage treatment tank having a treatment chamber filled with a filter medium, wherein the filter medium is supported and fixed in the treatment chamber by two upper and lower holding plates, and a lower holding plate for supporting the filter medium from below is formed of resin. The holding plate has a frame portion, and a lattice portion having a plurality of openings formed therein is integrally formed with the frame portion, and the lower end portions of the frame portion and the lattice portion are respectively provided. A ridge projecting downward is formed, has a U-shaped cross-section, and a receiving pedestal composed of a vertical bar and a horizontal bar is disposed at the bottom of the processing chamber, and the upper portion of the receiving pedestal is a lower holding plate. A sewage treatment tank, wherein the lower holding plate is inserted between the projecting strips at the lower end and supported in the treatment chamber. 2. The sewage treatment tank according to claim 1, wherein an engagement portion projecting upward is provided on a bottom portion of the treatment chamber, and a lower end of a vertical bar of the receiving base is inserted into the engagement portion. 3. An upper holding plate for supporting the filter medium from above is also made of resin, and this holding plate has a frame portion, and a lattice portion having a plurality of openings formed therein is integrally formed with the frame portion. At the same time, a bar member that comes into contact with the bar member is laid over the upper surface thereof in the direction of the lattice portion, and the bar member has a hollow first bar member and a second bar member inserted therein. The sewage treatment tank according to claim 1, wherein the sewage treatment tank is stretchable in a lattice direction.