JP2000093985A - Infiltration-type wastewater treatment apparatus and laying method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infiltration-type wastewater treatment apparatus which is used in discharging sewage (wastewater) treated and discharged from a so- called small-type combined processing and septic tank facilities or a single private sewage treatment system (for night soil) in ordinary homes, etc., in an area wherein a sewerage system is not fully furnished and the distances between houses are relatively large and which scarcely pollutes groundwater and enables the clarification of sewage by soil to be positively unitized. SOLUTION: This apparatus comprises hollow sump vessel 20 and a tubular stone wall 42. The sump vessel 20 is laid substantially in the ground, is used for storing, in the inside 23, sewage A subjected to clarification treatment with a combined processing and septic tank or a single private sewage treatment system, and has, at the circumference of the bottom part, an opening 24 which allows sewage A to flow out. The stone wall 42 is formed on the outer surface of the sump vessel 20, increases the infiltration zone, is communicated, at the lower end 43, to the opening 24 formed at the circumference of the bottom part of the sump vessel 20, and is formed by piling up many small cobble-stone- like particles 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an osmotic drainage system used for discharging wastewater that has been purified and discharged in a combined septic tank or a single septic tank in an ordinary household in an area where the sewerage system is not fully equipped. The present invention relates to a processing device.

[0002] In this specification, the term "single septic tank" or "single septic tank" refers to a septic tank that treats only human waste and does not treat (does not enter) household wastewater or rainwater. "Or" Joint septic tank "
A septic tank that treats human waste and household wastewater (bath, washing / cleaning, and kitchen wastewater) together.

[0003]

2. Description of the Related Art In an area where there is no public sewerage, in a general household, a so-called "osmotic mass type" as shown in FIG. Wastewater treatment apparatus 101 is known.

[0004] In this conventional wastewater treatment apparatus 101 known as the Aichi method, a crushed stone layer 104 having a grain size of about 2 to 5 cm and cobblestone or olivine is placed at the bottom of a hole 103 dug in the ground 102. A fume tube 105 having a thickness of about 30 cm and a cylindrical body having a thickness of about 10 cm and an inner diameter of about 120 cm and having openings at both ends is erected thereon, and granules are formed on the crushed stone layer 104 in the fume pipe 105. Diameter 5mm ~ 1
A sand / gravel layer 106 consisting of a layer 106a of gravel of about cm and a layer 106b of sand having a particle size of about 1 to 3 mm is 30 cm
The drainage space 108 is formed to have a thickness of about the same, and the drainage storage space 108 through which sewage can penetrate downward U through the layers 106 and 104. Reference numeral 109 denotes an introduction pipe for introducing sewage discharged from a combined septic tank (not shown) into a drainage accommodating space 108 in the permeation mass type wastewater treatment apparatus 101. The introduction pipe 109 is a discharge port (for example, Sewage (drainage) from underground 41 cm) has a gradient of about 1/100 and fume pipe 105
Is provided at a depth of, for example, about 70 cm (about 60 cm from the ground when the upper end of the fume pipe is projected upward from the ground 102 by 10 cm) from the upper end opening of the fume pipe 105 so as to flow into the chamber 108. Can be The ground may coincide with the upper surfaces of the lids 110 and 111, for example, in a semi-circular shape, as shown by the imaginary line 102a. The length (depth) of the fume tube 105 depends on the number of households using the combined septic tank, and the maximum design drainage per person per day (typically 0.2 m ³ , for example, 50%
The per capita wastewater volume with a safety factor of about 0.3
m ³ ). In this example, it is about 240 cm for a family of five.

In the permeation mass type wastewater treatment apparatus 101, the wastewater from the septic tank introduced in the V direction from the introduction pipe 109 accumulates in the wastewater treatment space 108. Under the action of gravity, the wastewater in the treatment space 108 penetrates the sand / gravel layer 106 in the U direction and is filtered by the sand / gravel layer 106, and then enters the crushed stone layer 104 in the W direction. Go through the basement 11
2 penetrates in the Z direction.

[0006]

That is, the conventional permeation mass type wastewater treatment apparatus 101 is one that finally permeates the wastewater from the septic tank below ground (gravity permeation), typically as much as possible. It is released so that it penetrates deep underground, and there is a high possibility of contaminating groundwater.

[0007] The disposal of wastewater (sewage) from a small-sized combined septic tank or the like at the price of such contamination of groundwater is permitted in an area where the density of houses is low. Limited to the case where water other than is mainly used. For example, in areas where there is no large river that can be used as a water supply source except for the Tone River water area, such as Chiba Prefecture, groundwater occupies a large proportion of the water supply source, so groundwater contamination must be avoided as much as possible. .

[0008] Japanese Patent Application Laid-Open No. 10-113681 discloses that
Although a technology of a wastewater treatment device mainly for treating domestic wastewater to obtain middle water is disclosed, this device is a transpiration device having a filter layer filled with a filter (filter medium) and a submersible pump inside. It is a relatively large-scale one that uses an aquarium tank during infiltration, and is not only something that can be used in ordinary households, but also considers that filter replacement and regular maintenance and inspection of submersible pumps are indispensable. Can be

The present invention has been made in view of the above points, and has as its object the purpose of the present invention in an area where sewers are not fully equipped and houses (persons) are relatively far apart. In general households, it is used when discharging wastewater (drainage) that has been treated and discharged in a so-called small-sized combined septic tank or a single septic tank, has a low risk of contaminating groundwater, and actively purifies the sewage by soil. An object of the present invention is to provide a permeation type wastewater treatment apparatus and method which can be used.

[0010]

In order to achieve the above object, the permeation type wastewater treatment apparatus of the present invention is substantially buried in the ground and collects therein sewage that has been purified by a combined septic tank or a single septic tank. A hollow reservoir forming body having an opening on the bottom peripheral surface that allows the outflow of the sewage, and underground, a permeation area expanding means formed on the outer periphery of the reservoir forming body, The lower end of which is communicated with the opening of the bottom peripheral surface of the reservoir forming body, and the permeation area expanding means is formed by stacking a large number of olivine-like granules.

In the permeation type wastewater treatment apparatus of the present invention, since an opening is formed in the outer periphery of the bottom of the reservoir forming body, when the wastewater purified by the combined septic tank or the single septic tank flows into the reservoir forming body, the drainage is discharged. It flows out of the opening on the outer periphery of the bottom of the reservoir forming body. Further, in the seepage type wastewater treatment apparatus of the present invention,
Since the permeation area enlarging means communicating with the opening at the bottom peripheral surface of the reservoir forming body at the lower end is formed on the outer periphery of the reservoir forming body, sewage (drainage) flowing out from the opening at the bottom outer periphery of the reservoir forming body Enters the permeation zone expanding means communicating with this opening. The sewage in the infiltration area expanding means permeates and diffuses from the outer periphery of the infiltration expanding means into the ground (in the soil) around the permeation expanding means. Purification can take place.

Further, in the permeation type wastewater treatment apparatus of the present invention,
Since the permeation area enlarging means is formed by stacking a large number of oligurite-like granules or granules (granules or granules having a size similar to oligurite) on the outer periphery of the reservoir forming body, the permeation area enlarging means is formed. Has a larger outer peripheral surface area than its drainage storage capacity. Therefore, the infiltration area expanding means, which forms the communication pipe in cooperation with the reservoir forming body, is used for the wastewater (drainage).
Sewage (drainage) with virtually no drop in water level
Increases the surface area in contact with the surrounding soil, making it easier for sewage to permeate and diffuse into the surrounding soil. In addition, since this contact area depends on the water level of the sewage in the reservoir forming body, when the inflow speed (flow rate) of the sewage from the septic tank into the reservoir forming body increases, the sewage water level in the reservoir forming body rises,
The permeation / diffusion speed of the wastewater from the permeation area expanding means can be increased.

On the other hand, the gap (gap) between the olivine-like granular material is extremely large as compared with the clearance between the surrounding soil, and the flow of drainage through the olivine-like granular material when the sewage infiltrates into the soil. Since the resistance is practically negligible, the infiltration area expanding means formed by stacking the olivine-like granules increases the contact area of the sewage with the surrounding soil without increasing the flow resistance and facilitates the infiltration into the soil. .

In addition, in the infiltration type wastewater treatment apparatus according to the present invention, the sewage is practically horizontally deposited on the soil from the outer peripheral surface of the infiltration area enlarging means located at about the same level as or above the bottom opening of the reservoir forming body. It is possible to avoid (minimize) the infiltration (especially the so-called gravity infiltration) of sewage downward from the buried position of the reservoir forming body because the water penetrates and diffuses into the reservoir. It can also be minimized. Furthermore, in the infiltration type wastewater treatment apparatus of the present invention, since infiltration occurs mainly in the horizontal direction, the soil area in which the sewage infiltrates is relatively close to the ground surface (shallow in the ground). Because the soil is likely to be kept dry due to the effect of evaporation of water, its penetration rate can be relatively high.

Further, in the seepage type wastewater treatment apparatus of the present invention,
Since the reservoir forming body and the permeation area expanding means are communicated with each other at the bottom of the reservoir forming body, even if fine particulate solids such as fine particulate sludge float or remain in the sewage, the fine particulate sludge or the like can be used. Can be drained toward the infiltration zone expansion means without accumulating on the bottom of the reservoir formation. Furthermore, since the infiltration area expanding means is obtained by stacking the olivine stone-like fluids, microorganisms derived from the soil or the like adjacent to the outer periphery adhere to the surface of the olivine stone-like granular materials and remain in the sewage such as fine granular sludge. Since it can be expected to help the decomposition of solids, there is little risk that solids and the like in the sewage will adhere to and accumulate on the permeation area expanding means. Therefore, the permeation type wastewater treatment apparatus of the present invention is less likely to be clogged even during long-term use.

The shape of the reservoir forming body is not limited as long as it has a space for forming a chamber for storing wastewater purified and discharged in a combined septic tank or a single septic tank and is mechanically and chemically stable. May be something. The shape of the reservoir forming body is typically cylindrical, and the cross-section of the cylinder is circular, but the cross-sectional shape may be elliptical, rectangular, or polygonal. Further, the tubular body typically has a constant cross-sectional area regardless of its axial position (location), but if desired, it may be thinner toward the lower end, or conversely thicker toward the lower end. It may have a thick (large diameter) portion or a thin (small diameter) portion in the middle in the vertical direction.
In addition, since the soil around the cylindrical body is softened more or less with water, the axis of the cylindrical body is oriented substantially vertically in order to avoid applying a force due to the weight of the cylindrical body or the like. As described above, it is preferable that the camera is placed substantially upright.

The material of the reservoir forming body may be made of any material as long as it is mechanically and chemically stable for a long period of time, and may be a metal material that is not easily corroded by sewage. It consists of a structure made of. The cylindrical body of the reservoir forming body may be a fume pipe (concrete pipe having a steel core as a core). However, in the wastewater treatment apparatus of the present invention, a conventional so-called permeation mass method in which sewage gravity permeates vertically downward. Unlike the ones, since the wastewater in the reservoir forming body permeates and diffuses in a substantially horizontal direction, it is not necessary to prohibit the leakage of the wastewater from the peripheral wall of the reservoir forming body, so as a concrete cylindrical body, for example, Inexpensive concrete frames (cylindrical bodies) conventionally used as well frames (so-called "well frames" or "well sides")
Can be used as is.

The volume of the chamber (reservoir) in the reservoir forming body is:
Based on the number of households using a small combined septic tank or a single septic tank connected to the reservoir forming body, for example, 0.3
The determination is made on the assumption that there is a discharge of sewage of about 0.36 m ³ / person (a value that allows a margin of, for example, about 50 to 80% with respect to the normal reference value of 0.2 m ³ / person). At this time, for example, in consideration of the outflow speed (flow rate per unit time) of the sewage due to infiltration from the infiltration area expanding means and the inflow speed (maximum flow rate and average flow rate per unit time) of the sewage into the reservoir forming body, The volume of the chamber may be determined, but for safety, the volume of the chamber may be determined on the basis that one day's worth of sewage can be stored as in the case of the conventional permeation mass type.

When a cylindrical body such as a well frame made of concrete is used as the reservoir forming body, a circumferential opening is formed below the cylindrical body so as to form an opening for allowing outflow of sewage on the bottom peripheral surface. A plurality of spacer members are arranged at intervals, and a tubular body is arranged on the spacer members. Of course, if desired, instead of or in addition to using the spacer member, the opening may be formed by cutting out the lower end of the peripheral wall of the cylindrical body. As a cylindrical body, a concrete well frame (for example, having an inner diameter of 9
When using about 0 cm or 75 cm, about 60 cm in height, and about 6 cm or 5 cm in thickness), the spacer member typically has a side of about 10 cm (for example, 1 cm).
0-13cm concrete block (for example,
"Pinkoro"). The spacer member has, for example, a predetermined size in a range of about several cm to 20 cm, preferably about 10 cm (for example, 10 to 13 c
m) as long as an opening having a height of about m) can be formed and is mechanically and chemically stable for a long period of time. If the height of the opening is too small, there is a possibility that the permeation area enlarging means may not be able to work effectively because the communication passage becomes thin and the rapid inflow of sewage from the reservoir part forming body to the permeation area enlarging means is prevented. On the other hand, if the height of the opening is too large, there is a possibility that it becomes difficult to stably support the stacked body of the olivine-like granular material forming the permeation area expanding means. The spacer members are usually arranged at substantially equal intervals in the circumferential direction, but in some cases, the intervals in the circumferential direction may not be constant. The number of spacer members is 3 so as to define a plane.
Any number may be used as long as it is equal to or more than one, but as long as the circumferential opening length can be made sufficiently large, for example, about three to four,
The number may be larger (for example, about 6 to 8).
However, considering that there is a limit to the reduction of the cross-sectional area of the spacer member from the viewpoint of mechanical strength in order to increase the opening length in the circumferential direction, it is preferable that the number of spacer members is not so large.

In order for the sewage reservoir in the reservoir forming body to be a chamber having a sufficient volume, a long cylindrical body (preferably, an opening having the same size as the opening on the bottom peripheral surface is formed in the vertical direction) May be used on the peripheral wall (peripheral surface) at the intermediate portion of the cylindrical member, but instead, a plurality of cylindrical members may be stacked, that is, a plurality of cylindrical members may be stacked. However, if the cylindrical body becomes too long as a whole, the bottom of the cylindrical body will be located deep underground, and the permeation and diffusion of sewage will be performed deep underground. It is preferable to select the number of stacks so that the length of the cylindrical body is about 150 cm or less. When stacking cylindrical bodies in multiple stages,
It is preferable to dispose the above-described spacer members at a plurality of positions in the circumferential direction between adjacent end surfaces of the cylindrical bodies stacked on each other. With this spacer member, an opening is also formed on the peripheral surface of the intermediate portion in the vertical direction of the reservoir forming body. In this way, not only can inexpensive well frames (well side) be used, but also the inflow of sewage into the infiltration area expanding means can be performed more quickly. That is, even when sewage flows in from the lower end side of the permeation area expanding means, the gas in the gap of the means can be discharged from the permeation area expanding means into the reservoir forming body through the intermediate opening, so that the communication pipe is Inflow of sewage through can occur more quickly. In addition, when the level of sewage in the reservoir formation rises,
Since a kind of overflow action occurs and sewage can flow in from the vertical middle part of the infiltration area expansion means,
The inflow of sewage into the infiltration area expanding means can be performed more quickly. The size and number of the spacer members and the spacing in the circumferential direction may be the same or different between the bottom portion and the intermediate portion. In addition, the infiltration area expanding means, which is formed by stacking a large number of Oguri stone-like particles, has a small flow resistance to water flowing through the gap between the particles, so that the sewage flowing out from the opening at the bottom peripheral surface of the cylindrical body expands the infiltration area. In view of the fact that it can be quickly spread in the means, it is not necessary to dispose a spacer member between the stacked tubular bodies.

Of course, even if each cylindrical body and the spacer member at the bottom (or top) thereof are formed integrally instead of being formed as separate members, the cylindrical body and the spacer may be formed as separate members and made of different materials. You may.

In order to increase the volume of the chamber in the reservoir forming body, two or three or more reservoir forming bodies are juxtaposed instead of stacking the cylindrical bodies in a plurality of stages (ie, a plurality). Is also good. Also, two or three or more reservoir forming bodies formed by stacking a plurality of cylindrical bodies may be arranged in parallel. Typically, 2
It is preferable to arrange a number of cylindrical bodies stacked in a row as necessary to give a desired volume. When a plurality of reservoir forming bodies are arranged side by side, the distance from the house is made as large as possible by arranging them parallel to the adjacent wall surface (or the base part) of the house (for example, at least about 1.5 m or 2 m). Or more).

Whether or not the cylindrical bodies forming the reservoir forming body are stacked is determined by whether the upper end of the cylindrical body slightly (for example, 1
Under the condition that the cylindrical body is buried underground so as to protrude, for example, in consideration of the relationship between the overall height (depth) of the stacked cylindrical bodies and the underground stratum, The bottom of the cylindrical body is determined so as to be located sufficiently above the water level of the groundwater and the layer through which the groundwater flows so that there is no possibility that sewage is mixed into the layer through which the groundwater flows. With respect to the reservoir forming body, "substantially buried in the ground" means that most of the reservoir forming body is buried in the ground, and rainwater flows into the reservoir forming body from above. This does not mean that the upper end protrudes to the ground to some extent (for example, about 5 cm to 10 cm) so as to avoid the above. In addition, when a reservoir part formation body consists of a cylindrical body which has an opening in the upper end, the opening of an upper end is closed by the lid which can be opened and closed. However, the top or top surface of the reservoir forming body is substantially the ground (ground surface)
May be the same as

An introduction pipe for introducing treated sewage discharged from the septic tank into the chamber of the reservoir forming body is attached to the upper peripheral wall of the cylindrical body forming the reservoir forming body. This inlet pipe preferably has an inlet at a position slightly lower than the drainage port of the septic tank so that sewage from the septic tank flows down naturally. The wastewater treatment apparatus of the present invention is disposed at a certain distance (for example, at a distance of 2 m or more) from (the main body of) the septic tank because water permeates and diffuses into the surrounding soil and softens at all. Is preferred. When a plurality of cylindrical bodies (or stacks thereof) are juxtaposed, even if an inlet pipe for directly introducing sewage from the septic tank is attached to each of the juxtaposed cylindrical bodies (stacks), An introduction pipe is attached to only one cylindrical body (stack), and another tubular body (stack) is juxtaposed through a communication path including an opening on the bottom peripheral surface and a permeation area expanding means. The sewage from the cylindrical body (stacked body) may be introduced. The wastewater introduced into the wastewater treatment device of the present invention is:
Effluent treated in a combined (typically small) septic tank or a single septic tank, or substantially the same. For example, household wastewater itself from a bath or kitchen containing a soap-like component such as an alkali metal salt of a fatty acid is introduced after being treated in a combined septic tank.

[0025] The permeation area expanding means is formed on the outer periphery of the reservoir forming body, preferably over the entire area in the circumferential direction. However,
In some cases, it may not be formed on a part in the circumferential direction (for example, on the side facing the house). The infiltration area enlarging means is typically formed in the vertical direction over a range substantially corresponding to the bottom opening of the reservoir forming body or slightly below the same to the vicinity of the upper end of the tubular structure. . The lower end of the permeation zone expanding means substantially coincides with the bottom opening of the reservoir forming body so that minute solids in the sewage discharged from the outer periphery of the bottom of the tubular structure can be prevented from accumulating near the opening. It preferably extends to a point or slightly below. However, in order to minimize the spread of sewage downward, it is preferable that the lower end of the infiltration area expanding means is approximately the same depth as the lower end of the bottom opening of the reservoir forming body. On the other hand, the upper end of the infiltration area expanding means preferably extends to near the ground surface so that the sewage that has infiltrated into the ground can be evaporated and diffused from the ground surface by solar heat. However, it is necessary to prevent the surface soil from being washed away due to rain, etc. shortly after the construction, and to prevent the soil from flowing into the gaps of the stone walls of the Oguri stone-like granular material together with the rainwater to clog the gaps. The upper end of the infiltration area expansion means should be located somewhat below the ground surface, for example, about several tens of cm below, typically about 30 cm below, so that grass etc. can grow and the surface soil can be solidified. It is preferred to be located. This depth can be determined appropriately according to the topography of the area and the structure of the stratum in accordance with the gist of the present invention.

The permeation area expanding means is formed by stacking olivine stone-like particles on the outer periphery of the reservoir forming body. In this specification, the term "ogritite-like granular material" or "ogritite-like granular material" refers to a granular material having a particle size in the range of about 2 to 3 cm to about 10 cm, and the particle size is preferably Is 3-8cm
Degree, more preferably about 5-7 cm, and what is known as so-called "Oguri stone (koguriishi)" (i.e., it is round in rivers and the like and has a diameter of 10 to 10 cm). "Kuriishi (Kuriishi or Gryishi)", which is known as a stone used for concrete aggregate at a size of about 15 cm, is reduced, and is typically similar to Cogli stone produced in Tochigi Prefecture, or the like. A particle having a particle size, for example, a concrete having a size within the above-mentioned desired range (for example, a particle size of about 3 to 10 cm).
It may be crushed. If the particle size of the olivine-like granular material is too large, the gap (gap) between the granular materials becomes too large in a state where the granular materials are stacked, and the thickness of the stacked body constituting the permeation area expanding means is increased. That is, when the length in the radial direction is set to a thickness of about several granules, the ratio of the gap in the permeation area expanding means is increased, and the effect of expanding the surface area of the wastewater by the permeation area expanding means is diminished. On the other hand, if the particle size of the granular material is too small, the gap between the granular materials becomes too small, and the flow resistance of the sewage becomes too large. There is a risk of getting into the opening in the bottom peripheral surface of the body. In addition, the particle size of the Oguri stone-like granular material may be relatively large or relatively small from the average particle size. Therefore, as long as the Oguri stone-like granular material is mainly used, a small-diameter granular material or a large-diameter granular material is mixed to some extent, for example, a machine of a permeation zone expanding means formed in a cylindrical shape like a well. The target strength may be increased. Oguri stone-like granular material may be rounded like olivine, but need not have roundness. In order to give a certain degree of mechanical strength to the stack while using the same particle size, rather, it has a somewhat square surface or an irregular flat surface like a cracked stone Is preferred. Furthermore, the olivine stone-like granular material is capable of purifying the sewage by decomposing microscopic sludge floating and remaining in the sewage because microorganisms easily adhere to the surface so as to form an anaerobic filter bed as a whole. Material (for example,
Although it is preferable to use a material such as so-called "cogstone", it may be made of a material to which such microorganisms are unlikely to adhere in some cases.

The thickness of the permeation zone expanding means may be determined by the absolute length or may be determined according to the size of the olivine-like granular material.
The thickness is preferably about 15 to 20 cm in absolute length. Oguri stone-like granular material has a particle size of 2 to 10 cm
Considering that the thickness is preferably about 3 to 8 cm, the thickness is about 2 to 10 pieces, preferably about 3 to 7 pieces, and typically about 3 to 4 Or about 4 to 5 pieces. If the thickness is too small, not only does the contact area between the wastewater and the soil become small, but when viewed in the radial direction in the horizontal plane, there is an area where there is actually only one or no Oguriishi, While maintaining a considerable flow velocity, it hits the inner peripheral surface of the surrounding soil layer and erodes the soil, and the soil is deposited on the bottom of the infiltration area expanding means, or because of the space formed by erosion, There is a risk that the stack will collapse. On the other hand, if the thickness is too large, not only the installation space becomes large, but also fine particulate matter in the sewage accumulates in the gap and the gap may be narrowed.

The infiltration type wastewater treatment apparatus of the present invention is used under such a condition that the sewage flowing out from the infiltration area expanding means after being subjected to the purification treatment by the septic tank does not permeate into the groundwater vein, that is, the groundwater flowing layer. You. Therefore, as long as the soil around the infiltration area expansion means is not a poorly drained layer such as clayey, for example, the infiltration of sewage such as a sand layer, a red soil layer, a black soil layer, and a volcanic ash layer such as the Kanto loam layer is expected. Any layer may be used as long as it can be obtained. In addition, it is preferable that the sewage discharged from the infiltration area expanding means into the soil is used in a place where there is no possibility that the sewage will deeply penetrate into the groundwater and reach the groundwater layer,
For example, infiltration of sewage such as clayey layer between a surface layer where a seepage type wastewater treatment device of the present invention is buried and a groundwater layer, in a place such as a small hill having a rectangular surface nearby. Particularly suitable for use where there is a layer that can be blocked. In the former case, the sewage that has flowed out of the infiltration area expanding means into the soil is purified by microorganisms in the soil, reaches a rectangular surface, and flows down along the rectangular surface. In this case, it is desirable that there is no other house directly under the rectangular surface (for example, within 2 m from below the rectangular surface).

[0029] The wastewater treatment apparatus of the present invention is preferably arranged under the reservoir below the reservoir forming body and the permeation area enlarging means for draining the wastewater flowing out from the opening at the bottom peripheral surface of the reservoir forming body. It further has a flexible sheet-like member for inhibiting penetration. In this case, the risk that the sheet-like member permeates the sewage toward the layer in which the groundwater flows is minimized.
As the sheet-like member, for example, a sheet made of a plastic material which has a low risk of soil contamination and is chemically and mechanically stable for a long time even in soil is used. When the reservoir forming body has a bottom wall, the sheet-like member is
The permeation zone expanding means and its surroundings may only extend to the bottom of the hole.

Preferably, the house is built on the upstream side in the direction of flow of water with respect to the formation where the wastewater treatment device is provided. Is provided on the downstream side of a certain portion). However, even if the foundation of the house is located on the upstream side, for example, if there is a possibility that the sewage that has penetrated substantially horizontally into the soil may spread to the house, the wastewater treatment device may be located between the foundation of the house and the wastewater treatment device. Forms a sufficiently large bulkhead (retaining wall) in the ground so that sewage does not penetrate and wet the soil at the foundation of the house. This partition may be made of any material as long as it is stable for a long time, and is formed of concrete, for example. In either case,
In order to avoid the possibility that the soil forming the foundation ground of the house is softened by the infiltrated and diffused sewage, the wastewater treatment device is arranged at a certain distance (for example, about 2 m or more) from the house. . For similar reasons, the wastewater treatment device is preferably located some distance (eg, about 2 m or more) from the boundaries of the user's premises of the device.

In the wastewater treatment apparatus according to the present invention, preferably, a rigid flat member is disposed below the sheet member. The plate member is typically composed of a plurality of plate blocks, and a plurality of plate blocks are laid horizontally. This is a portion that protrudes downward from the bottom surface so as to form an opening on the bottom peripheral surface of the reservoir portion forming body, typically, a spacer member disposed on the bottom portion, or a olivine stone-like granular material of the permeation area expanding means. This is for preventing the object from gradually sinking, and is unnecessary when the stratum below the sheet-like member is extremely hard such as rock. In order to avoid sedimentation, it is sufficient that the area in the horizontal plane per weight is relatively large, so the blocks are arranged, for example, only under each spacer member and under the granite layer for olivine. You may. Needless to say, the lower surface of the flat member is preferably flat, but the lower surface may have some unevenness. Furthermore, in order to prevent the soil at the foundation of the house from becoming wet and softened by the water that has infiltrated and diffused, a partition wall (retaining wall) made of concrete or the like is formed between the house and the wastewater treatment device. In
Instead of the flat member, a bottom wall integral with the partition may be formed.

The method of laying the seepage type wastewater treatment apparatus of the present invention is as follows.
In order to achieve the above-mentioned object, the above-mentioned diffusion infiltration apparatus is buried in the ground on a small hill having a rectangular slope, or in the ground where the seepage of drainage is practically prohibited. Typically, digging a hole in the ground and laying a sheet-like member at the bottom of the hole to prevent water from penetrating below,
A cylindrical reservoir forming body having an opening at the bottom peripheral surface is disposed substantially upright on the sheet-like member, and is used for expanding a permeation area of drainage flowing out of the opening at the bottom peripheral surface of the reservoir forming body. Forming a permeation area expanding means by stacking the olivine-like granular material in the range from the upper surface of the sheet-shaped member to the vicinity of the ground on the outer periphery of the reservoir portion forming body in the ground to form a drainage flow space of .

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to a preferred embodiment shown in the accompanying drawings.

[0034]

1 and 2 (a), a house 1 of a general household is a small hill close to a rectangular surface 2 (inclination is, for example, 45 degrees or less and length on a horizontal projection plane is, for example, 1 m or more). Standing on a hill. Toilet 3, bath 4 and kitchen 5 in house 1
From the wastewater enters the combined septic tank 7 via the water distribution pipes 6a, 6b, 6c, 6d, and the sewage A purified by the combined septic tank 7
Is introduced via a pipe 8 into a permeated wastewater treatment apparatus 10 according to a preferred embodiment of the present invention. If the septic tank is not a combined septic tank but a single septic tank, the toilet 3
Effluent containing only human waste from a sewage treatment tank is introduced into a single septic tank, and only sewage treated in the single septic tank is treated with an osmotic wastewater treatment apparatus 10.
May be introduced. It should be noted that introduction of household wastewater, such as kitchen or bath drainage or laundry drainage, to the wastewater treatment apparatus 10 without treating it in the combined septic tank 7 requires the apparatus 10 and surrounding soil to be affected by soap water and the like. Avoid clogging or loss of purification capacity.

The combined septic tank 7 may be of any type known in the art. For example, as shown in FIG. 6, an inlet pipe 7a serving as a sedimentation separation chamber and connected to a pipe 6d. Anaerobic filter tanks 7b and 7c and anaerobic filter tank 7c for performing anaerobic digestion of sewage and the like by anaerobic microorganisms on sewage (drainage) introduced into septic tank 7 from The contact aeration tank 7d in which the sewage is introduced and the sludge is decomposed by the aerobic microorganisms, the sedimentation tank 7e for promoting the sedimentation and separation of the solids in the sewage treated in the contact aeration tank 7d, and the solids are almost separated. And a disinfection tank 7f for disinfecting the treated wastewater, and the purified wastewater A disinfected in the disinfection tank 7f is discharged from the outlet through the pipe 8. The treated sewage A discharged from the combined septic tank 7 typically has a BOD (Biochemical Oxygen Demand) of 20 ppm or less and a group of various bacteria such as Escherichia coli of 3,000 MPN or less.

As shown in FIGS. 3 to 5, the infiltration type wastewater treatment apparatus 10 includes a container or mass body 20 as a reservoir forming body, an infiltration area enlarging means 40, and a water drainage laid under these. It has a transparent and flexible sheet-like member 60 and a rigid flat plate-like member 70, and a lid 80 of the reservoir forming body 20.

The reservoir forming body 20 comprises a cylindrical well frame 21 as a cylindrical body and made of concrete, and a spacer member 22 disposed at the bottom of the well frame 21. Figures 3 and 4
In the example shown in (1), the reservoir forming member 20 is formed by stacking well frames 21 in two stages. As the cylindrical body 21, instead of a commercially available well frame (for example, one having an inner diameter of about 90 cm or 75 cm, a height of about 60 cm, and a wall thickness of about 6 cm or 5 cm), another cylindrical body or A non-cylindrical tubular body or the like may be used.

The bottom of each well frame 21, that is, between the bottom of the lower or lower well frame 21 a and the sheet-like member 60,
And the upper or upper well frame 21b and the lower well frame 21
5, four spacer members 22 are arranged at equal intervals along the circumferential direction, as shown in FIG. As the spacer member 22, for example, “pin roller”
For example, a rectangular parallelepiped concrete body (for example, a square having a bottom surface of about 15 cm and a height of preferably about 10 to 13 cm, typically about 12 cm) is used. The number and size (size) of the spacer members 22;
The arrangement and the like are selected and determined as desired. Note that the number, size, arrangement, and the like of the spacer member 22 at the bottom and the spacer member (spacer member in the vertical direction of the mass body 20) 22 between the well frames 21a and 21b may be changed.

The two-stage cylindrical members 21a and 21b and the two sets of spacer members 22 and 22 are formed by the sheet-like member 60 and the lid 8
In cooperation with 0, a cylindrical or cylindrical chamber (space), that is, a reservoir 23 is defined in the mass main body 20. More specifically, here, the reservoir 23 is a cylindrical body 21a, 2
1b and the lower surfaces 81, 81 of the two semicircular cover members 80, 80
And a space defined by the upper surface 61 of the sheet-shaped member 60. The reservoir 23 of the mass body 20 is
A pair (four in this example) of spacer members 22 arranged at the bottom of the opening a open at four locations on the bottom peripheral surface. Each opening 24 on the bottom peripheral surface is formed in the lower well frame 21a.
, A top surface 61 of the sheet-like member 60, a spacer member 22 adjacent in the circumferential direction,
22 surfaces.

The reservoir 23 of the mass body 20 is a set (4 in this example) arranged at the bottom of the upper well frame 21b.
) Are opened at four locations in the middle of the peripheral wall. Each opening 26 in the peripheral surface of the intermediate portion is
It is defined by the bottom surface (lower end surface) 25b of the upper well frame 21b, the upper surface (upper end surface) 27a of the lower well frame 21a, and the surfaces of the spacer members 22, 22 adjacent in the circumferential direction.

The introduction pipe 29 into which the sewage A purified by the septic tank 7 is introduced into the peripheral wall 28b of the upper well frame 21b.
Is installed. The introduction pipe 29 is connected to the discharge pipe 8 of the septic tank 7 and has an outlet of the septic tank 7 (for example,
It is inclined (for example, at a gradient of about 1/100) so that the purified sewage A flows down and is introduced in the direction B into the inlet 30 located slightly below the depth 41 cm).

The mass body, that is, the reservoir frame 20
Is buried in the underground 91 in such a state that the upper end portion 31 extends above the ground surface 90 by a length C (for example, about 5 to 10 cm) so that rainwater or the like does not enter. In addition,
In the state where the lid 80 is covered, the inflow of rainwater into the reservoir 23 of the mass main body 20 can be practically avoided. Therefore, an imaginary line 90a in which the upper surface or the top surface of the lid 80 is substantially flush with the ground (FIG. 4) ) May be at the level (height position) indicated by ().

The flexible sheet-like member 60 laid on the bottom of the mass body 20 is made of a material such as vinyl of a type that does not penetrate or permeate the sewage A in order to prevent gravity of the sewage A from penetrating downward. In addition, as the flexible sheet-shaped member 60, a plastic material that is stably maintained for a long time without being chemically altered or decomposed even in the soil 91 is used. The sheet-shaped member 60 is provided with a mass body 20 of the wastewater treatment device 10 so as to prevent the permeation of the sewage A into the underground.
In addition, it may extend not only over the entire bottom surface of the permeation zone expanding means 40 but also slightly outside thereof, and in some cases, may extend continuously below the combined septic tank 7. The laying surface 6 of the sheet-like member 60 is set so that groundwater does not enter the mass body 20.
1 is located sufficiently above the water level D of the groundwater (FIG. 2A).

The plate-like member 70 laid under the flexible sheet-like member 60 comprises a large number of plate-like blocks 71. In FIG. 4, the flat blocks 71 are laid closely so as to provide a continuous plane, but when the underlying formation 92 is relatively hard, the flat blocks 71 are laid only under the spacer members 22. You may. In this case, the plate-like block 7 is formed so that the sheet-like member 60 defining the lower surface of the gap 24 is horizontally supported over the entire surface.
1 may be embedded in the soil 92 such that its upper surface is flush with the surface of the soil layer 92.

The infiltration area expanding means 40 fills the outer periphery of the mass body 20 with an Oguri stone (for example, known as Oguri stone (Oguri stone) from Tochigi Prefecture) 41 as an Oguri stone-like granular material in a cylindrical shape. A cylindrical stone wall 42 is formed. The cylindrical stone wall 42 has a lower end 43 on the sheet-like member 60.
Surrounding the opening 24 in the bottom peripheral surface of the mass body 20;
The upper end portion 44 is located above the opening 26 in the middle portion of the mass body 20 and below the ground 90 by a predetermined depth E (typically, for example, about 30 cm). If the depth E is too large, not only does the effect of expanding the infiltration area by the cylindrical stone wall 42 decrease, but also the vicinity of the ground surface 90 in the sewage A that infiltrates and diffuses from the upper part of the stone wall 42 into the surrounding soil 91. It is difficult to expect the effect that water of water evaporates and disperses by heating the ground surface 90 by solar heat. If the depth E is too small, not only the soil 91a on the cylindrical stone wall 42 may be washed away by rain or the like, and may enter into the gap of the stone wall 42 together with the rainwater, but also the sewage which has permeated into the soil 91 from the cylindrical stone wall 42. A may reach the ground surface 90 immediately without being substantially purified in the soil, and the ground surface 90 may be in a wet state with sewage. The absolute value of the depth E may be changed according to the soil 91 and the geology thereunder, the groundwater level D, and the like. In order to keep the ground surface 90 around the wastewater treatment device 10 as dry as possible, the wastewater treatment device 10 should be housed in order to maximize the sunshine time on the ground surface 90 around the wastewater treatment device 10. It is preferable to dispose the camera 1 away from the house 1 to such an extent that it is unlikely to be shaded.

It is preferable that the thickness F of the cylindrical stone wall 42 is such that the stone wall 42 can stand on its own (to maintain a cylindrical shape without collapse even without support on the inner and outer peripheral sides). It is preferable that the average particle size of the olivine-like granular material 41 is about 3 to 5 times (typically, about 15 to 20 cm). The cylindrical stone wall 42 is formed relatively firmly against a radially inward external force by stacking the Oguri stone-like granular materials 41 (having a particle size of typically 3 to 8 cm) to a certain degree. Once the stone wall 42 is formed, once the stone wall 42 is formed, even if the particle size of the oguri stone 41 is smaller than the openings 24 and 26 of the mass main body 20, the oguri stone 41 forming the stone wall 42 is opened.
There is little risk of collapse into 4 and 26. Thickness F of stone wall 42
Is too small, for example, the sewage A flowing out of the opening 24 in the G direction suddenly hits the inner peripheral surface 93 of the outer soil 91 without being suppressed by the gap 45 between the oliches 41, and the like. There is a risk that the portion of the peripheral surface 93 may be eroded to form a concave portion, or the inner peripheral surface portion 93 around the concave portion may collapse, and the outer peripheral side support for the cylindrical stone wall 42 which is originally weak against outward force is missing. As a result, the stone wall 42 may be partially collapsed in the area. If the thickness F of the cylindrical stone wall 42 becomes too large, voids (granular materials 41) in the cylindrical stone wall 42
There is a risk that the size of the gap 45 between them becomes difficult to ignore compared to the size of the reservoir 23, and that solid matter in the sewage A remains in the gap 45 for a long time or is deposited.

Since the cylindrical stone wall 42 is formed by stacking the olivine stone-like granules 41, a gap 45 formed between the granules 41 is formed.
Is actually applied to the quiet flow of the sewage A entering the stone wall 42 through the opening 24 (and when the water level of the sewage A in the chamber 23 in the mass body 20 reaches the opening 26, the opening 26 also). Since it is large enough not to give upflow resistance, the cylindrical stone wall 42
The mesh-shaped gap 45 formed therein communicates with the reservoir or chamber 23 of the mass body 20 by the opening 24 serving as a communication passage. Therefore, the water level of the sewage A in the mesh-shaped gap 45 of the stone wall 42 also changes promptly according to the water level of the sewage A in the reservoir 23 so as to match this. On the other hand, since the bulk of the cylindrical stone wall 42 is occupied by the Oguri stone-like granular material 41 and the volume ratio occupied by the gap 45 is small,
3 can substantially increase the surface area of the sewage A in contact with the surrounding soil or the inner peripheral surface 93 of the stratum 91 (ie, the area of the outer peripheral surface of the stone wall 42) without substantially lowering the water level of the sewage A in the soil 3. The infiltration of sewage A into 91 can be performed effectively.

Further, the gap 45 of the cylindrical stone wall 42 is not always immersed in sewage, and microorganisms derived from the soil can propagate on the surface of the Oguri stone-like granular material 41 constituting the stone wall 42, and the sewage A When the stones penetrate into the soil 91 through the gap 45, the stone wall 42 functions as an anaerobic filter, and is also used for decomposing and purifying sludge-like substances in the form of minute solids remaining in the wastewater A. We can expect to contribute.

The capacity J of the storage section 23 depends on the number of households in the house 1 (for example, the maximum possible number of persons).
The amount of wastewater per person (typically, 0.3 to 50% to 80% of the maximum used amount
~ 0.36 m ³ / day), for example, one day of sewage A
The diameter of the well frame 21 of the mass body 20 and the depth H of the mass body 20 are determined according to the volume J. However, when the maximum amount of sewage A is discharged by the maximum number of persons, the cylindrical stone wall 42 of the wastewater treatment apparatus 10 is compared with the flow rate of the sewage A flowing into the chamber 23 of the mass body 20 per unit time. If the flow rate of the sewage permeating through the soil layer 91 per unit time per unit time is sufficiently large, the sewage A hardly accumulates in the chamber 23 of the mass body 20, and Although it is possible to make the volume J of the wastewater considerably smaller than the amount of wastewater for one day, in this wastewater treatment apparatus 10, the amount of permeation of the wastewater A is substantially proportional to the level of the wastewater A in the chamber 23. Since the outflow speed (flow rate per unit time) due to diffusion fluctuates, a design that makes the evacuation speed too high does not effectively use the apparatus 10. Therefore, in this device, the surrounding soil layer 91 is rather adjusted so that the average outflow rate per day substantially matches the maximum inflow per day.
It may be preferable to select the area of the peripheral surface of the device 10 in consideration of the degree of drainage. When the volume J of the wastewater treatment device 10 is to be increased, one or both of the diameter and the depth H may be increased as necessary. Considering the requirement that the risk of infiltration of sewage should be minimized, it is preferable to control the depth H to typically about 150 cm or less, for example, as shown by imaginary lines in FIGS. 3 and 4. As described above, the mass body 20a and the cylindrical stone wall 40a similar to the mass body 20 and the cylindrical
Preferably, 0 is formed. Further, in this case, the sheet-like member 60 is provided between the two mass bodies 20, 2 in the middle without a break.
It preferably extends below 0a. Further, in this case, the thickness ranges from about the same as the sum of the thicknesses of the cylindrical stone walls 40 and 40a (typically about 30 to 40 cm) to about the thickness of one stone wall (typically about 15 to 20 cm). Of the cylindrical stone walls 40, 40a by bringing the mass bodies 20, 20a close to each other to a desired distance.
May be partially shared. Thereby, the chambers (reservoir parts) 23, 23 in the two mass bodies 20, 20a are
In effect, they will communicate. Two or more mass bodies 20
Are arranged in parallel, the mass body 20 and the cylindrical stone wall 40
In order to avoid excessively close to the house 1, the direction of the juxtaposition is such that the line connecting the central axes of the two mass bodies 20, 20a is the adjacent wall surface of the house 1 (or the line connecting the base part).
Preferably, it is parallel to 1a (FIG. 1). Below,
For the sake of simplicity, an example in which the mass body 20 includes only one will be described.

The soil layer 9 located on the outer periphery of the cylindrical stone wall 40
1 comprises a layer of relatively well drained soil, such as, for example, sand, black soil, red soil, volcanic ash such as Kanto loam.

Therefore, the sewage A that has reached the outer peripheral surface of the cylindrical stone wall 40 is transferred from the inner peripheral surface 93 of the soil 91 into the soil 91.
Permeates and diffuses in the direction. At that time, the sewage A is purified by microorganisms in the soil 91. Therefore, for example, as shown in FIG. 2A, the water M that has passed through the soil layer 91 is adjacent to the rectangular surface 2 (the distance from the infiltration wastewater treatment apparatus 10 is, for example, about 2 m or more). When it seeps out of the soil, it is effectively completely purified and
For example, the BOD is reduced by about 90% (that is, reduced to about 10%) and the number of coliform bacteria is reduced to a small number, as compared with the sewage A discharged from the combined septic tank 7, for example, depending on the property of 1. Can be expected. SS (suspended solids) is also virtually completely removed. In addition, sewage (BOD)
Is 90 ppm or less), it can be expected that the BOD can be reduced by about 65%. Therefore, the water M flowing on the ground surface through the rectangular surface 2 has substantially no properties as sewage. However, in consideration of hygiene, it is preferable that the distance L from the lower side of the rectangular surface 2 to another house (for example, another person's house) 1A is some distance, for example, about 2 m or more. In addition, it is preferable that a gutter 95 with a lid, which is a gutter through which rainwater flows, is formed below the rectangular surface 2.

Further, sewage that permeates and diffuses while being purified from the ground surface 90 in relatively shallow ground is heated by the heat of the sun.
As 0 dries, it is diffused toward the ground surface 90 while being purified, and evaporates from the ground surface 90.

The wastewater treatment apparatus 10 is designed to control the flow direction of the groundwater so that the sewage that permeates and diffuses into the soil 91 from the cylindrical stone wall 42 does not reach the foundation of the house 1.
Laying downstream of the house 1 and at a distance N (for example, about 2 m or more) which is equal to or more than a predetermined distance from the adjacent surface 1a of the house 1 (more precisely, the adjacent portion of the base portion 1b of the house 1). Is done. However, the groundwater level D is relatively shallow,
If drainage of the soil (geological layer) 91 is not very good,
There is a risk that sewage will permeate and diffuse into the base of the house.
A partition or retaining wall 96 (for example, a concrete wall) for preventing permeation and diffusion of moisture in the soil 91 is provided in a region between (FIG. 2A). In this case, the retaining wall 96
The bottom wall 96a functioning as the rigid plate-shaped member 70 may be integrally formed by extending the lower portion of the base plate horizontally.

When laying the wastewater treatment apparatus 10, the geological structure including the surrounding soil layer 91 is important. For example, even if there is no nearby rectangular surface, the groundwater level D
As shown in FIG. 2 (b), the water such as a clay-like layer is located between the stratum 97 having the groundwater level D and the soil layer 91 in which the seepage treatment apparatus 10 is buried. Where there is a formation 98 that effectively prevents the penetration of the device 1 is particularly suitable for the arrangement of the device 1.

When arranging the wastewater treatment apparatus 10, a hole of a desired size is dug in the soil 91 in an area where the geology and the stratum structure are confirmed in advance by a geological survey, and the upper surface is horizontal at the bottom of the hole. A flat block 70 is laid so as to have a flat surface, and a flexible, water-impermeable sheet-like member 60 is laid thereon, and then the spacer members 22 are arranged on the sheet-like member 60. The lower well frame 21a is placed on the upper side in an upright state, the spacer members 22 are further arranged on the upper end surface 27a of the well frame 21a, and the upper well frame 21b is placed on the upper side in the upright state. 21b and the pipe 29 are connected. The well frame 21 and the spacer member 22 may be integrated with each other with cement or the like, or may be simply stacked without being integrated. The connection to the upper well frame 21b of the pipe 29 may be integrated such that there is no leakage of sewage, or may be integrated (fixed) to such a degree that there is no backlash, or the pipe 29 may be simply inserted into the inlet. But sewage A is well frame 4
Since it is less likely that the ground surface 90 will be contaminated when it spreads from below than it spreads from above in the second gap 45, it is preferable to suppress sewage leakage at the connection part to a certain extent or less.

Next, the Oguri stone 41 is stacked in the hole around the mass body 20 composed of the well frame 21 and the spacer 22 by a predetermined thickness to form a cylindrical stone wall 42. Finally, the soil is backfilled around and on top of the cylindrical stone wall. In addition,
At this time, the surrounding soil layer 91 may be formed by replacing the soil of the soil layer 91 around the cylindrical stone wall 42 with at least partially drainable sand or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing an outline of an example in which a seepage type wastewater treatment apparatus according to a preferred embodiment of the present invention is applied to sewage treatment of ordinary households.

FIGS. 2A and 2B are schematic explanatory views showing the arrangement of the example of FIG. 1 in a vertical cross section, where FIG. 2A shows a case where a rectangular surface is near, and FIG. 2B shows a case where a clayey stratum is below.

FIG. 3 is a partially cutaway perspective view of a frame (mass main body) of a permeation type wastewater treatment apparatus according to a preferred embodiment of the present invention.

FIG. 4 is an explanatory sectional view of a permeation type wastewater treatment apparatus according to a preferred embodiment of the present invention.

FIG. 5 is an explanatory bottom view showing the arrangement of spacer members in the apparatus shown in FIG. 4;

FIG. 6 is a schematic cross-sectional explanatory view of an example of a combined septic tank to which the wastewater treatment device of FIG. 4 is applied.

FIG. 7 is an explanatory sectional view of a conventional permeation mass type wastewater treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 House 2 Rectangular surface 7 Merged septic tank 8, 29 Piping 10 Infiltration type wastewater treatment apparatus 20, 20a Frame body (mass main body) 21, 21a, 21b Cylindrical body (well frame) 22 Spacer member 23 Storage part (space) 24, 26 Opening 40,40a Infiltration area expanding means 41 Oguri stone-like granular material (ogolitic-like granular material) 42 Cylindrical stone wall 45 Gap 60 Sheet member 70 Rigid flat member 80 Lid 90,90a Ground (ground surface) 91 Soil A Drainage from septic tanks (sewage) D Groundwater level E Depth of top edge of cylindrical stone wall F Thickness of cylindrical stone wall H Depth of reservoir forming body K Penetration and diffusion direction

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[Procedure amendment]

[Submission date] July 19, 1999 (1999.7.1)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 10

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

In order to achieve the above object, the permeation type wastewater treatment apparatus of the present invention is substantially buried in the ground and collects therein sewage that has been purified by a combined septic tank or a single septic tank. A hollow reservoir forming body having an opening on the bottom peripheral surface that allows the outflow of the sewage, and underground, a permeation area expanding means formed on the outer periphery of the reservoir forming body, and a what is communicated with the bottom peripheral surface opening of the reservoir forming member at the lower end, permeation zone expansion means, discharge
The surface area of the outer periphery is large for the volume of wastewater to be discharged.
In a state where a communication pipe is formed in cooperation with the reservoir formation body.
In practice, the level of sewage in the reservoir
Surface area where sewage contacts with surrounding soil without lowering
To make it easier for sewage to permeate and diffuse into the surrounding soil.
As described above, it is formed by stacking a large number of Oguri stone-like granular materials.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

The method of laying the seepage type wastewater treatment apparatus of the present invention is as follows.
In order to achieve the above-mentioned object, the above-mentioned diffusion infiltration apparatus is buried in the ground on a small hill having a rectangular slope, or in the ground where the seepage of drainage is practically prohibited. Typically, digging a hole in the ground and laying a sheet-like member at the bottom of the hole to prevent water from penetrating below,
A cylindrical reservoir forming body having an opening at the bottom peripheral surface is disposed substantially upright on the sheet-like member, and is used for expanding a permeation area of drainage flowing out of the opening at the bottom peripheral surface of the reservoir forming body. In order to form a drainage flow space, underground, the olivine-like granular material is stacked in the range from the upper surface of the sheet-like member to the vicinity of the ground on the outer periphery of the reservoir forming body, and the wastewater to be discharged is
Large surface area for the storage volume, cooperates with reservoir formation
In the state where the communication pipe is formed by
Sewage sewage with virtually no drop in sewage level
Surface area in contact with the soil
And means for expanding the permeation area so that the wastewater easily permeates and diffuses .

Claims (11)

[Claims] 1. A hollow reservoir forming body which is buried substantially in the ground and stores therein sewage purified and treated by a combined septic tank or a single septic tank, and an opening for allowing the outflow of the sewage to the bottom peripheral surface. And a permeation area enlarging means formed on the outer periphery of the reservoir forming body in the ground, the lower end being communicated with an opening on the bottom peripheral surface of the reservoir forming body. A permeation zone expansion means, wherein the permeation zone expansion means is formed by stacking a large number of olivine-like granular materials. 2. A sheet-like member which is disposed below the reservoir forming body and the permeation area enlarging means, and which inhibits drainage flowing out from an opening in a bottom peripheral surface of the reservoir forming body from penetrating downward. 2. The seepage type wastewater treatment device according to 1. 3. The infiltration type wastewater treatment apparatus according to claim 1, wherein the infiltration area expanding means extends upward to near the ground. 4. The osmosis type wastewater treatment apparatus according to claim 1, wherein a rigid plate-like member is laid below the sheet-like member. 5. The reservoir forming body is provided with an opening at an intermediate portion in a vertical direction of a peripheral surface thereof to allow drainage of drainage.
5. The seepage type wastewater treatment apparatus according to any one of the items 1 to 4. 6. A reservoir forming body is formed by stacking a plurality of cylindrical bodies having openings at both ends via a plurality of spacer members arranged at intervals in the circumferential direction, and between the circumferentially adjacent spacer members. 6. The permeation type wastewater treatment apparatus according to claim 5, wherein the opening in the peripheral surface is formed in the sewage treatment apparatus. 7. The infiltration type wastewater treatment apparatus according to claim 6, wherein the tubular body is made of concrete, and the spacer member is made of a rectangular parallelepiped made of concrete. 8. A second reservoir forming body, which is configured in the same manner as the reservoir forming body, is further provided adjacent to the reservoir forming body, and the two reservoir forming bodies have an enlarged permeation area. The osmosis type wastewater treatment apparatus according to any one of claims 1 to 7, wherein the apparatus is connected to each other via a means. 9. The infiltration type wastewater treatment apparatus according to any one of claims 1 to 8, wherein the infiltration type wastewater treatment apparatus is substantially prohibited in the ground on a small hill having a rectangular slope or infiltration of wastewater. Of osmotic wastewater treatment equipment to be buried underground on such a stratum. 10. A sheet-like member for digging a hole in the ground to prevent water from penetrating below is laid at the bottom of the hole, and a cylindrical reservoir forming body having an opening on the bottom peripheral surface is placed on the sheet-like member. In a substantially upright state, in the ground to form a drainage flow space for expanding the permeation area of the drainage drained from the bottom peripheral surface of the reservoir portion forming body, in the ground, at the outer periphery of the reservoir portion forming body A method for laying an osmosis-type wastewater treatment apparatus comprising stacking olivine-like granules in a range from the upper surface of a sheet-like member to the vicinity of the ground to form a permeation area expanding means. 11. The method for laying a permeation type wastewater treatment apparatus according to claim 10, wherein a flat member is laid below the sheet member at the bottom of the hole before the sheet member is laid.