JPH08197079A - Terminal treating device of waste water in site - Google Patents

Abstract

PURPOSE: To obtain a terminal treating device of waste water in a site without a filter medium being hardly clogged and easy to maintain. CONSTITUTION: A hole 2 is excavated in the soil without timbering from the ground 1, and a water-impermeable sheet 5 is laid over the bottom face of the hole 2. A ceramic filter medium 3 is piled up at the center of the hole 2, and a crushed-stone filter medium 4 is filled around it. A separation box 6 is set at the part of the ceramic filter medium 3. The bottom of the box 6 is funneled and closed, a water discharge port is formed around the upper part, and the discharge port is positioned above the ceramic filter medium 3. A waste water introducing pipe 11 is set between the water discharge port of the box 6 and the bottom. The lower end of a sludge lifting pipe 15 is placed at the bottom of the box 6, and the sludge lifting pipe 15 and the box 9 is connected through a sludge discharge pipe 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-site drainage terminal treatment device for finally treating the drainage on the premises of one's own in areas where public sewers are not drawn.

In an area where public sewers are drawn, waste sewage discharged from toilets and household wastewater discharged from water sources such as kitchens are directly fed to public sewers and collected at local wastewater treatment plants. After purification treatment, it is released to rivers. On the other hand, in areas where such public sewers are not drawn, in-house treatment is the principle, and after treating the wastewater in the septic tank installed in each household, etc., it is drained to the gutter drainage channel, or such gutter drainage is used. In areas where there is no road, final disposal is done on the premises of the house.

In particular, when the final treatment of wastewater is carried out on the premises of one's own house, the wastewater treated in a septic tank such as an aeration system is guided to a wastewater terminal treatment device on the premises, where the wastewater permeates into the soil on the premises through a filter medium. I was processing it. The conventional on-site drainage terminal treatment device that performs final drainage treatment on such a site is
A digging hole was dug in the soil, a polyethylene film was attached to the bottom of the hole, a crushed stone filter material made of split stone was filled there, and a drainage introduction pipe for introducing drainage from the septic tank was connected to the upper part of the filter material. . The wastewater introduced into the upper part of the filter medium from the septic tank through the drainage introduction pipe permeates the filter medium, is finally purified by the microbial film formed on the surface of the filter medium, and permeates into the soil from the periphery of the uncovered hole.

[0004]

However, in the conventional on-site drainage terminal treatment device as described above, when the treatment of the drainage is continued, the filter medium is clogged, and the drainage becomes difficult to permeate. Further, there is a problem that maintenance for such clogging is very difficult.
Therefore, in view of the above-mentioned conventional problems, it is an object of the present invention to provide an on-site drainage terminal treatment device which is less likely to cause clogging of filter media and is easy to maintain.

[0005]

In order to achieve the above object, in the present invention, before introducing the wastewater from the wastewater introducing pipe 11 into the filter media 3 and 4, the wastewater is guided to the separation basin 6 where sludge is precipitated. Only the supernatant water was made to penetrate into the upper portions of the filter media 3 and 4. Then, the sludge settled in the separation box 6 was discarded and stored in a sludge box 9 different from the filter medium. Further, the filter media 3 and 4 have a double structure of the ceramic filter media 3 and the crushed stone filter material 4, so that the crushed stone filter material 4 is less likely to be clogged.

[0006] That is, the on-site drainage terminal treatment device according to the present invention comprises a bare hole 2 excavated from the ground 1 into the soil, a water-impermeable sheet 5 laid on the bottom of the bare hole 2, and a bare hole. Two
In which the bottom is closed and a drainage port 7 is provided around the upper part, and the drainage port 7 is Separation box 6 installed in the uncovered hole 2 so as to be located above the filter media 3, 4, a drainage introduction pipe 11 piped between the water discharge port 7 and the bottom of the separation box 6, and the lower end are separated. It is characterized by having a sludge suction pipe 15 arranged at the bottom of the masu 6 and a sludge discharge pipe 12 piped from the sludge suction pipe 15 to the sludge masu 9.

Here, the filter media 3 and 4 are the porous ceramic filter media 3 piled up in the peripheral portion of the separation box 6, and the crushed stones surrounding the porous ceramic filter media 3 and filled in the hollow 2 It consists of a filter medium 4. In addition, drainage pipe 11
Is arranged at a position deviated from the center of the separation box 6. The bottom of the separation box 6 has a slope so that the center becomes deepest, and the lower end of the sludge suction pipe 15 is arranged at the center of the deepest bottom of the separation box 6.

[0008]

In the on-site drainage terminal treatment device according to the present invention as described above, the drainage introducing pipe 11 is provided between the bottom and the water outlet 7 of the separation box 6 having the water outlet 7 at the bottom. Therefore, of the wastewater that has flowed into the separation box 6 through the wastewater introduction pipe 11, sludge having a large specific gravity is deposited on the bottom of the separation box 6, and only the supernatant water is discharged from the discharge port 7 to the upper part of the filter media 3, 4. Is discharged to. Then, the sludge settled on the bottom of the separation basin 6 flows into the sludge suction pipe 15 whose lower end is arranged at the bottom, and from this sludge suction pipe 15, the sludge discharge pipe 12
It is sent to the sludge basin 9 through. For this reason, only the supernatant drainage without sludge components flows out to the filter media 3 and 4,
Does not become clogged. The sludge discharged to the sludge basin 9 can be discarded by drawing it from the same.

Here, when the drainage introducing pipe 11 is arranged at a position displaced from the center of the separating box 6, the drainage flowing into the separating box 6 through the draining introducing pipe 11 is swirled in the separating box 6. Rotate to. Therefore, a substantially long flow path is formed from the introduction port to which the waste water introduction pipe 11 is connected to the discharge port 7, and the sludge component of the waste water is reliably precipitated, and only the supernatant water is discharged from the discharge port 7. Can be discharged. In addition, the bottom of the separation box 6 has a gradient so that the center becomes deepest,
By arranging the lower end of the sludge suction pipe 15 at the deepest center of the bottom of the separation basin 6, the sludge can be reliably assembled into the sludge suction pipe 15 and sent to the sludge basin 9.

Further, the filter media 3 and 4 are a porous ceramic filter media 3 piled up on the peripheral portion of the separation box 6 and a crushed stone filter media 4 which surrounds the porous ceramic filter media 3 and is filled in the unearthed hole 2. With the double structure, the waste water sufficiently purified by the porous ceramic filter medium 3 permeates the crushed stone filter medium 4, so that the crushed stone filter medium 4 can be prevented from being clogged.

[0011]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings. As shown in FIG. 1, a digging hole 2 is dug from the ground 1 in the site of a house into the soil, and a water impermeable film 5 made of a polyethylene film or the like is put on the bottom of the digging hole 2. In addition, the earth wall around the uncovered hole 2 is left as the soil surface. As shown in FIG. 3, in the illustrated embodiment, the flat rectangular uncoated hole 2 is excavated. However, the planar circular un excavated hole 2 may be excavated.

Next, the cleaning cylinder 1 is placed near the center of the hollow hole 2.
4 is set up. The cleaning cylinder 14 is open at both upper and lower ends, the lower end is near the bottom surface of the bare hole 2 in which the water impermeable film 5 is stretched, and the upper end reaches a position slightly lower than the ground 1. Further, a vertical hole is excavated adjacent to this uncovered hole 2, and a cylindrical sludge basin 9 having a closed bottom is installed therein. The open upper end of the sludge basin 9 has the same height as the ground 1.

The unfiltered holes 2 are filled with filter media 3 and 4.
First, a porous ceramic filter medium 3 made of bisque of zeolite lumps, etc. is loaded in the center of the undigging hole 2, and a crushed stone filter medium 4 made of split stone etc. is embedded around the porous ceramic filter medium 3. After the unfiltered holes 2 are filled with the filter media 3 and 4 to a certain extent, a separation box 6 having a cylindrical upper part and an inverted conical cylindrical lower part is installed on the upper part of the ceramic filter media 3. As shown in FIGS. 1 and 2, the upper surface of the separating box 6 is open, the bottom is closed,
And it has a funnel-shaped gradient at the bottom. A plurality of water discharge ports 7 are opened at the same height on the upper peripheral wall of the separation box 6.

Further, the separating box 6 and the cleaning cylinder 14 are provided.
A cylindrical manhole 8 is installed in the central portion of the bare hole 2 in which the ceramic filter material 3 is stacked so as to surround the. The upper and lower ends of this manhole 8 are open, and the upper end is at the same height as the ground 1. From an unillustrated septic tank, a drainage introducing pipe 11 is guided into the bare hole 2 with an appropriate downward slope, penetrates the manhole 8 and is further connected to the separating box 6.
As shown in FIGS. 1 and 2, the drainage introduction pipe 11 is connected to a portion directly above the inverted conical cylindrical portion of the separating box 6, that is, a lower portion of the cylindrical portion. The connection location is above the bottom slope and below the outlet. Further, as shown in FIGS. 3 and 4, the drainage introduction pipe 11 is eccentrically connected to the center of the waste water container 6 in a plan view. More specifically, they are connected in a tangential direction of an imaginary circle around the center of the separation box 6.

A nozzle-like sludge suction pipe 15 is installed in the longitudinal direction along the central axis of the separating box 6, and its lower end is arranged near the center of the deepest bottom of the separating box 6. Further, the upper end of the sludge suction pipe 15 is closed, and a portion close to the upper end is connected to the sludge discharge pipe 12 at a position below the water discharge port 7 of the separation basin 6. The sludge discharge pipe 12 penetrates the manhole 8, is led out from the uncovered hole 2 with an appropriate downward slope, and is connected to the sludge basin 9. A salan net 13 is stretched slightly above the bottom of the sludge basin 9.

In the illustrated embodiment, as shown in FIGS. 3 and 4, the drainage introduction pipe 11 and the sludge discharge pipe 12 are arranged in the extension direction with the separation box 6 interposed therebetween. However, depending on the conditions of the installation location, etc., the pipes may be arranged in the directions orthogonal to each other or in the directions intersecting diagonally.

As shown in FIGS. 1 and 2, the inside of the manhole 8 is filled with the ceramic filter medium 3 up to an appropriate height below the water discharge port 7 of the separation box 6. On the other hand, inside the uncovered hole 2 and outside the manhole 8, the crushed stone filter medium 4 is filled to the same level as the ceramic filter medium 3. further,
The backfill soil 16 is filled up to the height of the ground 1 in the unearthed hole 2 outside the manhole 8, that is, in the portion above the crushed stone filter medium 4. Further, the manhole 8 and the sludge basin 9 are provided with lids 10 and 17 at the upper end openings thereof, respectively, whereby the on-site drainage terminal treatment device is completed.

In such an on-site drainage terminal treatment device,
As shown in FIG. 4, since the drainage introduction pipe 11 is connected to the separation box 6 at an eccentric position, the wastewater flowing from the drainage introduction pipe 11 into the separation box 6 flows near the peripheral wall of the separation box 6. Then, as shown by the arrow in the figure, it rotates spirally. The wastewater that has flowed into the separation box 6 gathers in the central portion as the speed in the box 6 is lost. Then, solid matters such as sludge floating in the drainage settle, and as shown in FIG. 2, settle in the deepest part of the separation box 6. Then, the supernatant water having almost no solid content is discharged from the discharge port 7 of the separation box 6.

The sludge settled at the bottom of the separation basin 6 flows into the sludge suction pipe 15 whose lower end is located at the bottom of the sludge due to the water pressure of the waste water in the separation basin 6, and the sludge suction pipe 15 discharges the sludge. It is sent to the sludge container 9 through the pipe 12. This sludge box 9
Sludge is gradually accumulated on the lid, but at the appropriate time, the lid 1
By taking 7 and pumping up the sludge, the sludge can be discarded.

On the other hand, the supernatant water of the drainage discharged from the discharge port 7 of the separation box 6 is discharged onto the ceramic filter medium 3 and permeates the filter medium 3 downward. The wastewater is further purified in the process of permeating the porous ceramic filter medium 3, and the uncovered hole 2
Diffuses into the surrounding area and penetrates into the crushed stone filter medium 4. Then, the waste water is further purified by the crushed stone filter medium 4 and diffused from the periphery of the uncovered hole 2 into the soil.

The sludge and surplus drainage accumulated at the bottom of the bare hole 2 can be cleaned by pumping it from the cleaning cylinder 14. In particular, since the biofilm separated from the surfaces of the ceramic filter medium 3 and the crushed stone filter medium 4 can be removed at any time, the filter mediums 3 and 4 can always be maintained in good condition.

[0022]

As described above, according to the present invention, the waste water and the sludge dispersed therein are separated, and only the supernatant water is permeated into the filter media 3 and 4 to be treated, and the sludge is collected in the sludge box 9. Since it is possible to eliminate sludge, it is easy to dispose of sludge. Furthermore, since the filter media 3 and 4 have the double structure of the ceramic filter media 3 and the crushed stone filter media 4, it is possible to permeate the sufficiently purified wastewater into the soil and prevent pollution such as eutrophication of the soil. .

[Brief description of drawings]

FIG. 1 is a vertical side view of an on-site drainage terminal treatment device according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional side view of a main part of the on-site drainage terminal treatment device according to the embodiment.

FIG. 3 is a cross-sectional plan view of the on-site drainage terminal treatment device according to the embodiment.

FIG. 4 is an enlarged cross-sectional plan view of main parts of the on-site drainage terminal treatment device according to the embodiment.

[Explanation of symbols]

 1 Ground 2 Undrilled hole 3 Ceramic filter medium 4 Crushed stone filter medium 5 Non-permeable sheet 6 Separation box 7 Separation cell outlet 11 Drainage introduction pipe 12 Sludge discharge pipe 15 Sludge suction pipe

Claims (4)

[Claims] 1. A bare hole (2) excavated from the ground (1) into the soil, a water-impermeable sheet (5) laid on the bottom of the bare hole (2), and a bare hole (2). A filter medium (3) filled in
In the on-site drainage terminal treatment device having (4) and the drainage introduction pipe (11) for introducing drainage into the filter media (3) and (4), the bottom is closed and the water discharge port 7 is provided around the upper part. ,
The separation box (6) installed in the uncovered hole (2) so that the drainage port (7) is located above the filter media (3) and (4), and the discharge port (7) of the separation chamber (6). ) And the bottom part, a drainage introduction pipe (11), a lower end of the sludge suction pipe (15) arranged at the bottom of the separation box 6, and this sludge suction pipe (15)
And a sludge discharge pipe (12) connected to the sludge basin (9). 2. The filter medium (3), (4) comprises a porous ceramic filter medium (3) piled up around a separation box (6), and a moat surrounding the porous ceramic filter medium (3). The on-site drainage terminal treatment device according to claim 1, comprising a crushed stone filter medium (4) filled in the hole (2). 3. The on-site drainage terminal according to claim 1, wherein the drainage introduction pipe (11) is arranged at a position deviated from the center of the separation box (6). Processing equipment. 4. The bottom of the separation box (6) has a gradient so that the center becomes deepest, and the lower end of the sludge suction pipe (15) is arranged at the deepest center of the bottom of the separation box (6). The on-site drainage terminal treatment device according to any one of claims 1 to 3, which is provided.