JP2960324B2 - On-site drainage terminal treatment equipment - Google Patents

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 drainage in a private site in an area where public sewerage is not drawn.

In an area where a public sewer system is provided, human wastewater discharged from toilets and household wastewater discharged from a water place such as a kitchen are directly passed to the public sewer system and collected at a local wastewater treatment plant. After purifying, they are discharged into rivers and the like. On the other hand, in areas where such public sewers are not drawn, in-house treatment is the rule, and wastewater is treated in a septic tank provided in each household, etc., and then drained to a gutter drain, or such drains are drained. In areas where there are no roads, final treatment is performed on their own premises.

[0003] In particular, in the case of final treatment of wastewater on a private site, the wastewater treated in a septic tank such as an aeration system is guided to an on-site drainage terminal treatment device, where the wastewater permeates into the soil on the site through a filter medium. Let it be processed. Conventional on-site drainage terminal treatment equipment that performs final drainage treatment on such premises,
A pit was dug in the soil, a polyethylene film was applied to the bottom, a crushed stone filter medium made of split rock was filled, and a drainage introduction pipe was introduced above the filter medium to guide wastewater from the septic tank. . The wastewater introduced from the septic tank to the upper part of the filter medium through the drainage introduction pipe penetrates the filter medium, where it is finally purified by the microbial membrane generated on the surface of the filter medium, and penetrates into the soil from around the open pit.

[0004]

However, in the conventional on-site drainage terminal treatment apparatus as described above, if the wastewater treatment is continued, clogging of the filter medium occurs, and the permeation of the wastewater gradually becomes difficult. Then, there is a problem that maintenance for such clogging is very difficult.
Accordingly, an object of the present invention is to provide an on-site drainage terminal treatment device that does not easily cause clogging of a filter medium and that is easy to maintain in view of the above-mentioned conventional problems.

[0005]

In order to achieve the above object, according to the present invention, before introducing wastewater from the wastewater introduction pipe 11 to the filter media 3, 4, the wastewater is guided to the separation tub 6, where sludge is settled. Only the supernatant water was allowed to penetrate into the upper portions of the filter media 3 and 4. Then, the sludge settled in the separation basin 6 was discarded and stored in a sludge basin 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 media 4 so that clogging of the crushed stone filter media 4 hardly occurs.

That is, an in-site drainage terminal treatment apparatus according to the present invention comprises a raw excavation hole 2 excavated from the ground 1 into the soil, a non-permeable sheet 5 laid on the bottom surface of the raw excavation hole 2, and a raw excavation hole. 2
A filter medium 3 and 4 filled in, in those having a drain inlet pipe 11 for introducing the waste water into the filter media 3,4, bottom is closed, it has a water discharge port 7 on the upper periphery, the water discharge port 7 A separation tub 6 installed in the hollow 2 so as to be located above the filter media 3 and 4, a drainage introduction pipe 11 laid between the water outlet 7 and the bottom of the separation tub 6, and a lower end separated It is characterized by having a sludge suction pipe 15 arranged at the bottom of the basin 6 and a sludge discharge pipe 12 piped from the sludge suction pipe 15 to the sludge basin 9.

Here, the filter media 3 and 4 are composed of the porous ceramic filter media 3 stacked around the separation tub 6 and the crushed stone filled in the hollow 2 surrounding the porous ceramic filter media 3. And a filter medium 4. In addition, drainage introduction pipe 11
Is piped at a position shifted from the center of the separation tub 6. The bottom of the separation tub 6 has a gradient such that the center is the deepest, and the lower end of the sludge suction pipe 15 is arranged at the center of the deepest bottom of the separation tub 6.

[0008]

In the above-described on-site drainage terminal treatment apparatus according to the present invention, the bottom is closed, and the drainage introduction pipe 11 is connected between the water discharge port 7 of the separation basin 6 having the water discharge port 7 around the upper part and the bottom. Therefore, of the wastewater flowing into the separation tub 6 through the drainage introduction pipe 11, the sludge having a large specific gravity settles at the bottom of the separation tub 6, and only the supernatant water flows from the outlet 7 to the upper part of the filter media 3 and 4. The water is discharged. Then, the sludge settled at the bottom of the separation basin 6 flows into a sludge suction pipe 15 having a lower end disposed at the bottom, and the sludge discharge pipe 12
Is sent to the sludge measure 9. For this reason, only the supernatant water without sludge components flows out to the filter media 3 and 4, and the filter media 3, 4
Clogging does not occur. Further, the sludge discharged into the sludge basin 9 can be discarded by drawing it from the basin 9.

Here, when the drainage introduction pipe 11 is provided at a position deviated from the center of the separation tub 6, the wastewater flowing into the separation tub 6 through the drainage introduction pipe 11 is formed into a spiral shape in the separation tub 6. To rotate. Therefore, substantially longer flow path from the inlet to the drainage inlet pipe 11 is connected to the water discharge port 7 of the can is formed, it is performed reliably sludge fraction of precipitation of waste water, water discharge
Only the supernatant water can be discharged from the mouth 7. In addition, the bottom of the separation tub 6 forms a gradient such that the center is the deepest,
If the lower end of the sludge suction pipe 15 is arranged at the center of the deepest bottom of the separation tub 6, the sludge can be reliably assembled into the sludge suction pipe 15 and sent to the sludge tub 9.

Further, the filter media 3 and 4 are divided into a porous ceramic filter media 3 stacked around the separation chamber 6 and a crushed stone filter media 4 filled in the hollow 2 around the porous ceramic filter media 3. In the double structure, wastewater sufficiently purified by the porous ceramic filter medium 3 penetrates the crushed stone filter medium 4, so that clogging of the crushed stone filter medium 4 can be prevented.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; As shown in FIG. 1, a hollow 2 is dug in the ground from the ground 1 in the premises of the house, and a non-permeable film 5 made of a polyethylene film or the like is provided at the bottom of the hollow 2. Note that the earth wall around the open hole 2 is left as the earth surface. As shown in FIG. 3, in the illustrated embodiment, a flat rectangular hole 2 is excavated. However, a flat circular hole 2 or the like may be excavated.

Next, the cleaning cylinder 1 is located near the center of the hollow 2.
4 is erected. The upper and lower ends of the cleaning cylinder 14 are open, the lower end is near the bottom surface of the moat 2 covered with the water-impermeable film 5, and the upper end reaches a position slightly lower than the ground 1. In addition, a vertical hole is excavated adjacent to the open 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 hollow 2 is filled with filter media 3 and 4.
First, a porous ceramic filter medium 3 made of unfired zeolite lump is loaded in the center of the open hole 2, and a crushed stone filter medium 4 made of split stone or the like is embedded around the porous ceramic filter medium 3. After the moat 2 is filled with the filter media 3 and 4 to a certain extent, a separation basin 6 having a cylindrical upper portion and an inverted conical cylindrical lower portion is placed above the ceramic filter media 3. As shown in FIGS. 1 and 2, the upper surface of the separation tub 6 is open, the bottom is closed,
And it has a funnel-shaped gradient at the bottom. A plurality of water outlets 7 are opened at the same height in the upper peripheral wall of the separation basin 6.

Further, the separation tub 6 and the cleaning cylinder 14
A cylindrical manhole 8 is set in the central part of the hollow 2 in which the ceramic filter medium 3 is stacked so as to surround the manhole 8. The upper and lower ends of the manhole 8 are open, and the upper end is at the same height as the ground 1. A drainage introduction pipe 11 is guided from an unillustrated septic tank into the hollow 2 with a suitable downward slope, penetrates the manhole 8, and is connected to the separation basin 6.
As shown in FIGS. 1 and 2, the drainage introduction pipe 11 is connected immediately above the inverted conical cylindrical portion of the separation tub 6, that is, below the cylindrical portion. The connection position is above the bottom slope and below the outlet 7 . 3 and 4
As shown in the figure, the drainage introduction pipe 11 is eccentrically connected to the center of the wastewater basin 6 on a plane. More specifically, they are connected in a tangential direction of a virtual circle around the center of the separation tub 6.

A sludge suction pipe 15 in the form of a nozzle is installed vertically along the central axis of the separation tub 6, and its lower end is located near the center of the deepest bottom of the separation tub 6. Further, the upper end of the sludge suction pipe 15 is closed, and a portion near the upper end is connected to the sludge discharge pipe 12 at a position below the water discharge port 7 of the separation tub 6. The sludge discharge pipe 12 penetrates through the manhole 8, is drawn out of the moat 2 with an appropriate downward slope, and is connected to the sludge basin 9. The saran net 13 is stretched slightly above the bottom of the sludge measure 9.

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

As shown in FIGS. 1 and 2, the inside of the manhole 8 is filled with the ceramic filter medium 3 to an appropriate height below the water outlet 7 of the separation tub 6. On the other hand, the crushed stone filter medium 4 is filled to the same level as the ceramic filter medium 3 inside the hollow 2 and outside the manhole 8. further,
The backfill soil 16 is filled up to the level of the ground 1 in the open hole 2 outside the manhole 8, that is, the portion above the crushed stone filter material 4. In addition, lids 10 and 17 are respectively provided at the upper end openings of the manhole 8 and the sludge basin 9, thereby completing the on-site drainage terminal treatment device.

In such an on-site drainage terminal treatment apparatus,
As shown in FIG. 4, since the drainage introduction pipe 11 is connected to a position eccentric to the separation tub 6, the drainage flowing from the drainage introduction pipe 11 into the separation tub 6 flows near the peripheral wall of the separation tub 6. Then, as shown by the arrow in FIG. The drainage that has flowed into the separation basin 6 collects in the central portion as the speed in the basin 6 decreases. Then, solids such as sludge floating in the wastewater settle, and settle at the deepest part of the separation tub 6, as shown in FIG. Then, supernatant water having almost no solid content is discharged from the water discharge port 7 of the separation basin 6.

The sludge settled at the bottom of the separation tub 6 flows into a sludge suction pipe 15 having a lower end located at the bottom due to the water pressure of the drainage in the separation tub 6, and the sludge is discharged from the sludge suction pipe 15. It is sent to the sludge measure 9 through the pipe 12. This sludge measure 9
Gradually accumulates sludge, but the lid 1
By taking the sludge and pumping it up, the sludge can be discarded.

On the other hand, the supernatant water discharged from the water discharge port 7 of the separation basin 6 is discharged onto the ceramic filter medium 3 and permeates the filter medium 3 downward. The drainage water is further purified in the process of permeating the porous ceramic filter medium 3 and
, And penetrate into the crushed stone filter medium 4. Then, the wastewater is further purified by the crushed stone filter medium 4 and diffuses into the soil from the surroundings of the pit 2.

Further, the sludge and the excess drainage collected at the bottom of the hollow 2 can be cleaned by pumping them out of the cleaning tube 14. In particular, since the biofilm detached 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 be always maintained in a good state.

[0022]

As described above, according to the present invention, the wastewater is separated from the sludge dispersed therein, only the supernatant water is permeated into the filter media 3 and 4, and the sludge is collected in the sludge basin 9. Therefore, there is no clogging and the disposal of sludge becomes easy. Furthermore, since the filter media 3 and 4 have a double structure of the ceramic filter media 3 and the crushed stone filter media 4, the sufficiently purified wastewater can penetrate into the soil, and no pollution such as eutrophication of the soil occurs. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an on-site drainage terminal treatment apparatus 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 apparatus 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 a main part of the on-site drainage terminal treatment device according to the embodiment.

[Description of Signs] 1 Ground 2 Drilling Hole 3 Ceramic Filter Material 4 Crushed Stone Filter Material 5 Non-permeable Sheet 6 Separation Measuring 7 Separation Measuring Outlet 11 Drainage Injection Pipe 12 Sludge Discharge Pipe 15 Sludge Suction Pipe

Claims (4)

(57) [Claims] An excavated hole (2) excavated from the ground (1) into the soil, an impermeable sheet (5) laid on the bottom surface of the excavated hole (2), and an excavated hole (2) Filter material (3) filled in
In the on-site drainage terminal treatment device having (4) and a drainage introduction pipe (11) for introducing drainage into the filter media (3) and (4), the bottom is closed and a water outlet (7) is provided around the top. And a separation basin (6) installed in the open hole (2) such that the outlet (7) is located above the filter media (3) and (4).
A drain introduction pipe (11) piped between the water outlet (7) and the bottom of the separation basin (6), and a sludge suction pipe (15) whose lower end is disposed at the bottom of the separation basin 6. And a sludge discharge pipe (1) piped from the sludge suction pipe (15) to the sludge basin (9).
2) An on-site drainage terminal treatment device comprising: 2. The filter media (3) and (4) are composed of a porous ceramic filter material (3) stacked around a separation basin (6), and a moat surrounding the porous ceramic filter material (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 piped at a position offset from the center of the separation tub (6). Processing equipment. 4. The bottom of the separation basin (6) has a gradient such that the center is the deepest, and the lower end of the sludge suction pipe (15) is located at the center of the deepest bottom of the separation basin (6). The on-site drainage terminal treatment device according to any one of claims 1 to 3, wherein: