JP2000317481A - Septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a septic tank low in manufacturing cost and maintenance cost and having stable purification capacity sufficient for purifying sewage. SOLUTION: In an aeration chamber 5, countless fluidized carriers 9 on whose each surface aerobic bacteria are supported are filled to circulate by convection up and down together with the sewage by the air supplied through an air diffusing pipe 10. A partition member 13 is provided between the aeration chamber 5 and a precipitation chamber 6 to guide each carrier 9 to the convection direction and obstruct the outflow of each carrier 9. In the precipitation chamber 6, the sewage is circulated by convection together with the carriers 9 by the air supplied through the air diffusing pipe 10 to transfer solids on the bottom of the precipitation chamber 6 to the aeration chamber 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a septic tank. This septic tank can be used for a single septic tank capable of purifying human waste and a combined septic tank capable of purifying miscellaneous wastewater in addition to human waste.

[0002]

2. Description of the Related Art Heretofore, as a general purification tank for purifying sewage water consisting of human waste and miscellaneous wastewater, a purification tank having a contact aeration type aeration chamber and a sedimentation chamber is known. In the aeration chamber, a filter medium (contact material) is fixed on the upper side, and a diffuser pipe connected to a blower for feeding an oxygen-containing gas such as air is provided below. The aeration chamber may be provided with a cylindrical cleaning cylinder whose lower end is opened at the bottom and extends vertically upward. A backwash tube connected to a similar blower and supplying an oxygen-containing gas may be provided below the aeration chamber. Further, in a combined septic tank having an anaerobic chamber partitioned by a partition on the upstream side of the aeration chamber, a transfer pipe having one end opened at the bottom of the aeration chamber and the other end opened to the anaerobic chamber may be provided. On the other hand, on the downstream side of the aeration chamber, a sedimentation chamber separated by a partition wall whose bottom communicates is adjacent.

In this type of septic tank, sewage is supplied into the aeration chamber from above. The sewage flows through the gap between the filter media, and is also decomposed by aerobic bacteria living on the surface of the filter media. receive. During this time, the air diffuser supplies oxygen to the aerobic bacteria. In the case of a septic tank equipped with a backwash tube, extra aerobic bacteria (solid matter) that adhered to the filter medium and propagated by the oxygen-containing gas supplied from the backwash tube whenever necessary can be separated from the filter medium. it can. The treated water thus purified to some extent is stored in the aeration chamber, and the treated water precipitates solids still contained in the downstream settling chamber, and the supernatant water is discharged with the addition of disinfecting water as desired. It will be.

The solids remaining in the sedimentation chamber are subject to the re-decomposition of the dirt by the aerobic bacteria in the aeration chamber, since the sedimentation chamber and the aeration chamber communicate at the bottom. In a combined septic tank equipped with a transfer pipe, the transfer pipe takes in the water flow generated by the oxygen-containing gas supplied from the same blower, so that the solid matter remaining in the aeration chamber is upstream from the transfer pipe. The anaerobic chamber is transported to the anaerobic chamber, where the anaerobic bacteria undergoes the decomposition of dirt. If the solid remains in the aeration chamber, the trader inserts a hose into the cleaning cylinder and pulls the solid through the hose.

[0005]

However, in the above-mentioned conventional general septic tank, since the filter medium is fixed in the aeration chamber, when the dirt is decomposed by the aerobic bacteria on the surface of the filter medium, the filter medium is removed. Clogging is likely to occur due to extra aerobic bacteria (solids). For this reason, the purification tank will cause a reduction in the purification ability as it is. Further, if an attempt is made to recover the purification ability by removing extra solid matter from the filter medium by the backwash tube, the production cost and the maintenance cost are increased by the amount of the backwash tube.

[0006] In this regard, Japanese Patent Application No. Hei 10
As in JP-A-123072 and Japanese Patent Application No. 10-123073, a septic tank in which an aeration chamber is filled with a myriad of fluid carriers can be considered. In such a septic tank, since each fluid carrier having an aerobic bacterium on the surface convects up and down together with the sewage by the oxygen-containing gas supplied from the air diffuser, the purification ability due to the clogging described above may not be reduced. Absent. Rather, the oxygen-containing gas makes it easier for the aerobic bacteria to come into contact with the sewage while stably supplying oxygen to the aerobic bacteria. In addition, each of the fluid carriers collides, interferes, and abuts on each other, and sticks to the surface, so that extra solid matter that has propagated can be separated. In this way, the sewage is easily decomposed by the aerobic bacteria, and the purification ability is enhanced. In addition, a backwash tube is not required, and the manufacturing cost and the maintenance cost can be reduced.

[0007] However, even in a septic tank having an aeration chamber using such a fluid carrier, if the solid matter remaining in the sedimentation chamber is hardly decomposed by aerobic bacteria in the aeration chamber, the result is satisfactory. It is difficult to obtain stable sewage purification ability. The present invention has been made in view of the above conventional situation, and provides a septic tank capable of stably exhibiting a satisfactory sewage purification ability while realizing low production costs and low maintenance costs. It is an issue to be solved.

[0008]

A septic tank according to the present invention is provided with a diffuser pipe for supplying oxygen-containing gas to stored sewage, and an aeration chamber for purifying the sewage with aerobic bacteria, and a partition communicating with a bottom. A septic tank having a sedimentation chamber adjacent to the aeration chamber while being separated by water and separating the sewage into solids and water by sedimentation, wherein the aerobic bacteria are supported on the surface of the aeration chamber, The oxygen-containing gas supplied from the trachea is filled with countless fluid carriers that convect up and down together with the wastewater, and between the aeration chamber and the precipitation chamber, each fluid carrier is guided in the convection direction while A separating member is provided for preventing the outflow of the fluidized carrier, and the sedimentation chamber is provided with a solid substance at the bottom of the sedimentation chamber by the sewage convection with the fluidized carrier with the oxygen-containing gas supplied from the air diffuser. To Characterized in that it is adapted to allow transfer to the aeration chamber.

In the septic tank according to the present invention, in the aeration chamber, a myriad of fluid carriers carrying aerobic bacteria on the surface are convected up and down together with the sewage by the oxygen-containing gas supplied from the air diffuser. There is no reduction in the purification capacity due to clogging of the filter medium as in a septic tank having a contact aeration type aeration chamber. Rather, the oxygen-containing gas makes it easier for the aerobic bacteria to come into contact with the sewage while stably supplying oxygen to the aerobic bacteria. In addition, each of the fluid carriers collides, interferes, and abuts on each other, and sticks to the surface, so that extra solid matter that has propagated can be separated. In this way, the sewage is easily decomposed by the aerobic bacteria, and the purification ability is enhanced. In addition, a backwash tube is not required, and the manufacturing cost and the maintenance cost can be reduced.

Further, in this septic tank, the solid matter at the bottom of the sedimentation chamber can be transferred to the aeration chamber in the sedimentation chamber by the sewage convection with each fluid carrier with the oxygen-containing gas supplied from the air diffuser. ing. For example, by forming the sedimentation chamber narrower toward the bottom side, the bottom side of the sedimentation chamber becomes negative pressure due to the sewage convection in the aeration chamber, and the solid matter at the bottom in the sedimentation chamber is transferred so as to be sucked into the aeration chamber. (Slot effect). At this time, a separating member is provided between the aeration chamber and the settling chamber, and the separating member prevents outflow of each fluid carrier. Further, since the separating member guides each fluid carrier in the convection direction, even if each fluid carrier tries to flow and collides with the separating member, the convection is not prevented, and the slot effect is effectively generated. For this reason, the solid matter remaining in the sedimentation chamber is easily susceptible to the decomposition of dirt by the aerobic bacteria in the aeration chamber, and as a result, a satisfactory sewage purification ability can be stably obtained.

As the separating member, a member extending in the direction of convection of each fluid carrier and having a guide portion capable of contacting each fluid carrier can be employed. In this separation member, the guide portion comes into contact with each fluid carrier and guides each fluid carrier in the convection direction. This separating member preferably has a reinforcing portion that intersects the guide portion. The septic tank is manufactured by filling each fluid carrier after providing the separation member. When filling each of the fluid carriers, a collision force of each fluid carrier acts on the separation member. In addition, the manufactured septic tank is shipped and transported in a state where each fluid carrier is filled in the aeration chamber.
At the time of such shipping or the like, a collision force due to the weight of each fluid carrier also acts on the separation member. Furthermore, during operation of the septic tank, each fluid carrier convects and exerts a collision force on the separation member together with the waste water. If the separating member has the reinforcing portion, it can surely withstand a collision force generated at that time. It is preferable that such a reinforcing portion does not protrude toward the aeration chamber.
This is because if the reinforcing portion protrudes toward the aeration chamber, the resistance when guiding each fluid carrier increases.

The guide portion is preferably of a shape which has a small contact area with each fluid carrier and can thereby reduce the resistance when guiding each fluid carrier. As such a guide portion, a polygonal shape such as an elliptical shape, a triangular shape, a quadrangular shape, or the like can be employed in addition to a general circular shape having a cross-sectional shape in a direction perpendicular to the axis. If the guide section has a circular cross section in the direction perpendicular to the axis, it is easy to purchase, and the manufacturing cost of the septic tank can be reduced. Further, if the cross-sectional shape in the direction perpendicular to the axis is a polygonal guide portion, if the apex angle of the polygon is located on the aeration chamber side, it is easy to guide each fluid carrier, and the resistance at the time of guiding each fluid carrier is improved. Also easy to make small.

Preferably, the separating member is inclined or curved so as to have a downward slope toward the air diffuser. Thereby, at the bottom of the aeration chamber, each fluid carrier settling on the sedimentation chamber side is guided by the separating member and floated again by the diffuser tube, so that the convection of each fluid carrier becomes regular and the slot effect is obtained. Tends to occur. Therefore, in the septic tank of the present invention, a satisfactory purification performance of sewage can be stably exhibited while realizing a reduction in manufacturing cost and maintenance cost.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 8 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) In Embodiment 1, the septic tank of the present invention is embodied as a household combined septic tank. In this septic tank, as shown in FIG. 1, an FRP partition 2 and a partition 3 extending vertically are fixed in an FRP casing 1, and an anaerobic chamber 4 is formed by the front inner surface of the casing 1 and the partition 2. Formed,
An aeration chamber 5 is formed by the inner surface of the casing 1 and the partitions 2 and 3, and a sedimentation chamber 6 is formed by the rear inner surface of the casing 1 and the partition 3.

The anaerobic chamber 4 may be a sedimentation / separation chamber (rot chamber) in which a filter medium is not inserted or an anaerobic filter bed chamber in which a filter medium is inserted. Inflow port 7 through which sewage flows into the anaerobic chamber 4
A baffle 8 is fixed around the casing 1.
The aeration chamber 5 is filled with countless fluid carriers 9 in a volume of about 20 to 80% of the volume of the aeration chamber 5. These fluid carriers 9 are formed of polyethylene having a specific gravity of 0.93, and have an outer shape that does not trap air bubbles while securing a large surface area. The partition 2 at the bottom of the aeration chamber 5
On the side, a column-shaped air diffuser 10 is provided in parallel with and horizontal to the partition wall 2. It is connected. A cleaning cylinder (not shown) is also provided in the aeration chamber 4.

The bottom of the partition 3 is open in the entire width direction, and the aeration chamber 5 and the sedimentation chamber 6 communicate with each other at the bottom. Since the lower rear wall of the casing 1 has an inclined surface 1a that is inclined forward, the sedimentation chamber 6 is formed narrower toward the bottom. At the lower end of the partition 3, FIG.
As shown in detail in FIG. 3, a separating member 13 that vertically covers a communication port between the aeration chamber 5 and the sedimentation chamber 6 is a bracket 14.
It is fixed by. As shown in FIG. 3, the separation member 13 includes a plurality of guide portions 13a extending vertically.
And a frame 13b fixed to the upper and lower ends of each guide portion 13a. As shown in FIG. 4, each of the guide portions 13a has a circular cross section in the direction perpendicular to the axis, and as shown in FIG. 3, the interval between the adjacent guide portions 13a is smaller than the outer diameter of each of the fluid carriers 9. I have.

As shown in FIG. 1, a transfer pipe 15 extends vertically in the aeration chamber 5 so as to face the partition wall 3. Is connected to a blower 12 for feeding air as an oxygen-containing gas through a valve 16a. As shown in FIGS.
One end of the transfer pipe 15 is connected to two guide portions 13 of the separation member 13.
The opening 15a is opened toward the wall 1a at the bottom of the aeration chamber 5 on the side of the sedimentation chamber 6 between the openings a. On the other hand, as shown in FIG. 1, the other end of the transfer pipe 5 extends over the partition 2 upward, and the opening 15 b is open in the baffle 8 of the anaerobic chamber 4.

The sedimentation chamber 6 is provided with an inlet 17 through which purified water flows out. In the septic tank configured as described above, sewage first flows into the anaerobic chamber 4 through the inflow port 7. In the anaerobic chamber 4, the stored wastewater is purified by anaerobic bacteria. The sewage in the anaerobic chamber 4 moves into the aeration chamber 5 through a communication port (not shown) provided in the partition 2.

In the aeration chamber 5, a constant amount of air is continuously supplied from the air diffuser 10, and each fluid carrier 9 having aerobic bacteria carried on the surface thereof is supplied from the air diffuser 10. And convection up and down together with the sewage. For this reason, there is no decrease in the purification ability due to clogging of the filter medium as in a conventional septic tank having a contact aeration type aeration chamber. Rather, the aerobic bacteria and the sewage are more likely to come into contact with each other while supplying oxygen stably to the aerobic bacteria by air. In addition, each of the fluid carriers 9 collides, interferes, and abuts on each other, and sticks to the surface, so that extra solid matter that has propagated can be separated. In this way, the sewage is easily decomposed by the aerobic bacteria, and the purification ability is enhanced. In addition, a backwash tube is not required, and the manufacturing cost and the maintenance cost can be reduced.

The aerated chamber 5 stores treated water purified to some extent, and the treated water precipitates solids still contained in the settling chamber 6 on the downstream side. The solid matter remaining in the sedimentation chamber 6 is subjected to the decomposition of the dirt again by the aerobic bacteria in the aeration chamber 5 because the sedimentation chamber 6 and the aeration chamber 5 communicate with each other at the bottom. On this occasion,
In this septic tank, since the sedimentation chamber 6 is formed narrower toward the bottom by the wall surface 1a, the solid matter in the sedimentation chamber 6 is guided by the wall surface 1a and easily moves to the aeration chamber 5 side. .

In particular, in the sedimentation chamber 6, the solid matter at the bottom in the sedimentation chamber 6 is transferred to the aeration chamber 5 by sewage convection with each fluid carrier 9 by air supplied from the air diffuser 10. That is, the bottom side of the sedimentation chamber 6 becomes negative pressure due to the sewage convection in the aeration chamber 5, and the solid matter at the bottom in the sedimentation chamber 6 is transferred so as to be sucked into the aeration chamber 5 (slot effect).
As a result, the solid matter remaining in the sedimentation chamber 6 is easily susceptible to decomposition of dirt by the aerobic bacteria in the aeration chamber 5, and as a result, a satisfactory purification performance of sewage is stably obtained.

A separating member 13 is provided between the aeration chamber 5 and the sedimentation chamber 6, and the separating member 13
To prevent the outflow. Also, the guide portion 13 of the separation member 13
Since a is in contact with each of the fluid carriers 9 with a small contact area and is guided in the convection direction, even if each of the fluid carriers 9 collides with the separating member 13 to flow out, the convection is not prevented, and the slot effect is effectively prevented. Will occur. For this reason, the solid matter remaining in the sedimentation chamber 6 is easily susceptible to decomposition of dirt by the aerobic bacteria in the aeration chamber 5, and as a result, a satisfactory purification performance of sewage is stably obtained.

Since the transfer pipe 15 takes in the water flow generated by the air supplied from the blower 12,
The solid matter remaining in the aeration chamber 5 is transferred by the transfer pipe 15 to the anaerobic chamber 4 on the upstream side. At this time, at the bottom of the aeration chamber 5 on the sedimentation chamber 6 side, the transfer pipe 1 is moved toward the wall surface 1a.
Since the opening 15a at one end of the opening 5 is open,
Is preferably taken into the opening 15a and is preferably transferred to the anaerobic chamber 4. Also,
Since the opening 15a at one end of the transfer pipe 15 protrudes more toward the wall surface 1a than the separating member 13, solid matter in the sedimentation chamber 6 is taken into the opening 15a without being hindered by the separating member 13,
It is preferably transferred to the anaerobic chamber 4. As a result, the solid matter remaining in the aeration chamber 5 is liable to be decomposed by the anaerobic bacteria in the anaerobic chamber 4 and, as a result, a satisfactory sewage purification ability can be stably obtained.

In the sedimentation chamber 6, the supernatant water is discharged through the outlet 17 with the addition of disinfecting water as required. If the solids remain in the aeration chamber 5, a trader inserts a hose into the cleaning cylinder and pulls out the solids with the hose. Therefore, in the septic tank of the first embodiment, it is possible to stably exhibit satisfactory sewage purification ability while realizing low production costs and low maintenance costs. In addition, since the separation member 13 employs the guide portion 13a having a generally circular cross section in the direction perpendicular to the axis, it is easy to purchase the separation member 13, and in this regard, the production cost of the septic tank can be reduced. Has been realized.

In the septic tank of the first embodiment, the anaerobic chamber 4 is one, but the first anaerobic chamber and the second anaerobic chamber located downstream of the first anaerobic chamber are anaerobic chambers. 4 can also be configured. (Embodiment 2) In the septic tank of Embodiment 2, the opening 15a at one end of the transfer pipe 15 does not protrude from the separation member 13, as shown in FIG. Other configurations are the same as the septic tank of the first embodiment.

In this septic tank, since the opening 15a at one end of the transfer pipe 15 does not protrude from the separating member 13, when the solid matter in the sedimentation chamber 6 is taken into the opening 15a, it is slightly obstructed by the separating member 13. However, other effects can be obtained in the same manner as the septic tank of the first embodiment. (Embodiment 3) In the septic tank according to Embodiment 3, as shown in FIG. 6, the lower end of the separation member 13 is close to the air diffuser 10 side, and the communication port between the aeration chamber 5 and the sedimentation chamber 6 is connected to the air diffuser 10. It is covered with a downward slope toward. Other configurations are the same as the septic tank of the first embodiment.

In this septic tank, at the bottom of the aeration chamber 5, each of the fluid carriers 9 sinking on the sedimentation chamber 6 side is separated from the separation member 1.
As a result, the convection of each fluid carrier 9 becomes regular, and the slot effect easily occurs. Other functions and effects are the same as those of the septic tank of the first embodiment. (Embodiment 4) In the septic tank of Embodiment 4, as shown in FIG. 7, an opening 15a at one end of the transfer pipe 15 is parallel to the wall surface 1a. Other configurations are the same as the septic tanks of the first and third embodiments.

In this septic tank, the solid matter in the sedimentation chamber 6 and the solid matter in the aeration chamber 5 can be easily taken into the opening 15a to almost the same extent. Other functions and effects are the same as those of the septic tanks of the first and third embodiments. (Embodiment 5) In the septic tank of Embodiment 5, as shown in FIG. 8, the opening 15a of the transfer pipe 15 is parallel to the wall surface 1a without bending one end of the transfer pipe 15. Other configurations are the same as the septic tanks of the first, third, and fourth embodiments.

In this septic tank, the transfer tube 15 can be easily formed, and the production cost can be reduced. Other functions and effects are the same as those of the septic tank of the fourth embodiment. (Embodiment 6) In the septic tank of Embodiment 6, FIGS.
As shown in FIG.
What has the reinforcement part 13c orthogonal to this is employ | adopted.
Other configurations are the same as those of the septic tank of the first embodiment and the like.

In this septic tank, when each of the fluid carriers 9 is filled after the separation member 13 is provided, when the aeration chamber 5 is shipped and transported with each of the fluid carriers 9 filled, and when the septic tank is operated, Since the separating member 13 has the reinforcing portion 13c, it can surely withstand a collision force generated at that time. Other functions and effects are the same as those of the septic tank of the first embodiment and the like. (Embodiment 7) In the septic tank of Embodiment 7, as shown in FIG. 11, a separation member 13 having a reinforcing portion 13d that does not project toward the aeration chamber 5 is employed. Another configuration is the sixth embodiment.
It is the same as the septic tank.

In this septic tank, the reinforcing portion 13d is provided in the aeration chamber 5
It does not protrude to the side and reduces the resistance when guiding each fluid carrier 9. Other functions and effects are the same as those of the septic tank of the sixth embodiment. (Eighth Embodiment) In the septic tank of the eighth embodiment, as shown in FIG.
In the case of having a partition wall 19, the lower side is bent toward the settling chamber 18 side.
Is fixed to the casing 1 so that the sedimentation chamber 18 is formed narrower toward the bottom. Other configurations are the same as the septic tank of the first embodiment.

In this septic tank, the same operation and effect as those of the septic tank of the first embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a combined septic tank according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view of a main part of the combined septic tank according to the first embodiment.

FIG. 3 is a main part enlarged rear view of the combined septic tank according to the first embodiment.

FIG. 4 is a cross-sectional view at right angles to an axis of a separation member and the like according to the combined septic tank of the first embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of the combined septic tank according to the second embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part of the combined septic tank according to the third embodiment.

FIG. 7 is an enlarged cross-sectional view of a main part of a combined septic tank according to a fourth embodiment.

FIG. 8 is an enlarged cross-sectional view of a main part of a combined septic tank according to a fifth embodiment.

FIG. 9 is an enlarged rear view of a relevant part of the combined septic tank according to the sixth embodiment.

FIG. 10 is a cross-sectional view in the direction perpendicular to the axis of a separation member according to the combined septic tank of the sixth embodiment.

FIG. 11 is a cross-sectional view in a direction perpendicular to an axis of a separating member according to the combined septic tank of the seventh embodiment.

FIG. 12 is a schematic vertical sectional view of a combined septic tank according to an eighth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Anaerobic chamber 2, 3 ... Partition wall 10 ... Aeration pipe 5 ... Aeration chamber 6 ... Sedimentation chamber 15 ... Transfer pipe 15a ... Opening 9 ... Fluid carrier 13 ... Separation member 13a ... Guide part 13c, 13d ... Reinforcement part 1a ... Wall surface

Claims (5)

[Claims] An aeration tube for supplying oxygen-containing gas to stored sewage is provided, and an aeration chamber for purifying the sewage with aerobic bacteria and an aeration chamber adjacent to the aeration chamber while being separated by a partition having a bottom communicating therewith. A septic tank having a sedimentation chamber that separates the sewage into solids and water by sedimentation.In the aeration chamber, the surface of the aerobic bacteria is carried, and the oxygen-containing gas supplied from the air diffusion tube is used. Innumerable fluid carriers that convect up and down together with the sewage are filled, and a separation member between the aeration chamber and the sedimentation chamber that guides each fluid carrier in the convection direction and prevents the fluid carriers from flowing out. The sedimentation chamber is provided such that solids at the bottom of the sedimentation chamber can be transferred to the aeration chamber by the sewage convection with the respective fluid carriers with the oxygen-containing gas supplied from the aeration tube. Iko A septic tank characterized by the following. 2. The septic tank according to claim 1, wherein the separation member has a guide portion extending in a convection direction of each fluid carrier and capable of contacting each fluid carrier. 3. The septic tank according to claim 2, wherein the separating member has a reinforcing portion intersecting with the guide portion. 4. The septic tank according to claim 2, wherein the guide has a circular cross section in a direction perpendicular to the axis. 5. The septic tank according to claim 1, wherein the separation member is inclined or curved so as to have a downward slope toward the air diffuser.