JPH0647596Y2 - Septic tank - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a septic tank for purifying wastewater such as human waste, and more specifically, to a front part of a vent chamber having an air diffuser at the bottom and a communication port at the bottom. The present invention relates to a septic tank which is adjacent to a sedimentation chamber and is separated by a partition provided with a sludge.

<Prior Art> Conventionally, as a septic tank capable of drawing sludge settling in the settling chamber into the bubbling chamber, the one proposed in Japanese Utility Model Laid-Open No. 54-135046 is known.

In the septic tank 1 described in this publication, as shown in FIG. 5, a guide wall 5 is provided on a partition wall 2 which separates a gas chamber A and a precipitation chamber B adjacent to the front of the gas chamber A. The guide wall 5 is provided with the partition wall 2 to form a flow path C.

This flow path C is the reference water surface WL of the water to be treated in the upper part of the gas chamber A.
Of the partition wall 2 and the opening of the partition wall 2 in the vicinity of the communication port 3 that communicates the vaporization chamber A and the precipitation chamber B. In the flow path C, a diffuser pipe 4 is provided near the lower part of the partition wall 2 on the side of the diffuser chamber A, and the water to be treated which has risen in the diffuser chamber A due to bubbles from the diffuser pipe 4 is discharged from the upper opening 6. A circulation channel is formed to flow in and return from the lower opening 7 into the gas chamber A. The air diffuser 4 supplies oxygen to the activated sludge in the flash chamber A and also contributes to stirring the water to be treated. Further, the lower part of the circulation flow path C and the air diffusing pipe 4 are surrounded by a cylindrical body 9 extending from the bottom wall of the septic tank 1 in the communication port 3.

Then, in the septic tank 1, the sludge settled in the settling chamber B is drawn into the sparging chamber A by the water to be treated flowing in the circulation channel C.

<Problems to be solved by the invention> However, in this septic tank 1, since the diffuser pipe 4 is arranged in the vicinity of the lower part of the partition wall 2, the swirl of the treated water is swirled in the direction of the arrow a in the aeration chamber A. A flow occurs.

Then, in the bottom portion of the gas chamber A, the swirling flow is directed to the front partition wall 2, and therefore, from the communication port 3 excluding the cylindrical body 9 of the circulation flow channel C in the lower part of the partition wall 2 at a high flow velocity. The water flows into the settling chamber B and lifts up the sludge settling in the settling chamber B, causing a problem that the uncleaned wastewater is discharged from the discharge port 8.

Further, in this septic tank 1, the guide wall 5 and the partition wall 2 at the lower end of the circulation channel C are vertically formed downward. for that reason,
The water to be treated that has descended through the circulation channel C hits the bottom wall of the septic tank 1 vertically, causing turbulence on the settling chamber B side, and raising sludge that settles downward in the settling chamber B. This causes the same problem as described above. In addition,
As described in Japanese Utility Model Laid-Open No. 59-93790, the guide wall 5 is not provided so that the turbulent flow generated by the water to be treated descending the circulation channel C is not provided, and the turbulent air chamber A side is not provided. An air diffuser 4 is provided near the communication port 3 below the partition 2, and the swirl flow of the water to be treated rising along the partition 2 on the side of the flash chamber A generated by the diffuser 4 is used to settle in the precipitation chamber B. It is conceivable to draw the sludge into the air chamber A. However, even in the case of such a configuration, since the air diffuser pipe 4 is arranged in the vicinity of the partition wall 2, a swirling flow toward the partition wall 2 is generated at the bottom in the flash chamber A, and the communication port 3 is provided. The water to be treated flows into the settling chamber B at a high flow rate from the part excluding the box 9, and the same problem as described above occurs. Further, even if only the diffuser pipe 4 is used, the treated water above the diffuser pipe 4 actually starts to rise and swirls in the flash chamber A to remove the treated water below the diffuser pipe 4. The force of drawing in is weaker than that of the water to be treated flowing through the circulation channel C, and the effect of drawing in the sludge in the settling chamber B cannot be expected.

In addition, in order to deal with the above-mentioned problems,
As described in the publication, the air diffuser 4 is arranged at a position separated from the partition wall 2, and at the bottom of the gas chamber A,
It is conceivable to generate a swirling flow away from the partition wall 2 to draw in the sludge in the settling chamber B.

However, in the septic tank of the above publication, three circulation channels C provided in the partition wall 2 are formed apart from the left and right sidewalls of the gas chamber A and the precipitation chamber B and separated from each other. .

Therefore, in the part where the circulation channel C is not formed, the sludge is not sufficiently drawn into the settling chamber B. In particular, sludge easily accumulates and solidifies on the bottom walls near the left and right side walls of the sedimentation chamber B, and the solid sludge is not sufficiently drawn into the gas chamber A.

That is, the sludge that is accumulated and solidified on the bottom walls near the left and right side walls of the settling chamber B will be described. In this type of septic tank,
When the sewage flows into the sedimentation separation chamber, the treated water in the aeration chamber A flows into the sedimentation chamber B and the sludge rises up in the sedimentation chamber B even if bubbles are generated from the air diffuser 4. . Then, when the inflow of the wastewater into the sedimentation separation chamber is stopped, the sludge that has risen up is drawn into the spouting air chamber A by the drawing of the treated water flowing through the circulation channel C.

However, in the septic tank of the above publication, as described above, the partition wall 2
Since the three circulation flow paths C provided at the left and right side walls of the settling chamber B are formed separately from each other, the pulling force near the left and right side walls of the settling chamber B is weakened. There is. Further, due to the drawing of the treated water flowing through the circulation channel C, the treated water having substantially the same volume flows into the settling chamber B. The inflow route is between the side wall and the three circulation channels C. The water to be treated, which is dispersed into two types of routes that flow through and flows into the settling chamber B side near the side wall, has a relatively small flow rate and flow velocity together with the route between the circulation flow paths C. The sludge that has risen up is not drawn into the gas chamber A, but accumulates and is solidified.

This invention solves the above-mentioned problems, and sludge settling in the settling chamber can be drawn into the bath chamber A while avoiding soaring as much as possible, and the bottoms on the left and right sides of the settling chamber can be set. It is an object of the present invention to provide a septic tank that can draw sludge that easily accumulates near the wall into the air chamber A.

<Means for Solving the Problems> In a septic tank according to the present invention, a precipitation chamber is adjacent to a front part of a flash chamber having an air diffuser at the bottom and a partition wall having a communication port at the lower end center. In the septic tank that is present, in the center of the partition wall in the left-right direction, a through-hole is formed in the vicinity of the reference water surface of the water to be treated in the flash chamber, and in the settling chamber, the precipitation of the through-hole is performed. A front wall that covers the front of the chamber side and side walls that extend from both left and right sides of the front wall and are connected to the partition wall are provided, and the width of the lower end in the left-right direction is slightly narrower than the communication port, and the communication is performed. A guide wall extending to a central portion of the mouth is provided, and a lower end of a front wall of the guide wall is bent toward the flap air chamber side, and its tip is separated from the partition wall in the precipitation chamber and the bottom wall of the precipitation chamber. As a state, set the virtual extension line at the tip to the A bent portion that intersects with the bottom wall on the chamber side is formed, and the guide wall, together with the partition wall, causes the water to be treated in the flash chamber to flow in from the through port and returns from the communication port to the flash chamber. To form only one circulation channel, the diffusing pipe, to direct the flow of the water to be treated at the bottom of the flash chamber toward the center from the left and right sidewalls of the flash chamber,
It is arranged substantially orthogonal to the partition wall, or is arranged apart from the partition wall so as to direct the flow of the water to be treated at the bottom of the flash chamber from the partition wall to the bottom wall of the precipitation chamber. A peripheral wall extending upward from the front and left and right side peripheral edges is formed in a shape narrowing toward the periphery of the communication port.

<Operation and effect of the device> In the septic tank according to the present invention, the peripheral wall extending upward from the front and left and right side peripheral edges of the bottom wall in the settling chamber has a funnel-like shape that narrows toward the periphery of the communication port of the circulation channel. The sludge that has been formed and settles in the settling chamber is reliably collected in the vicinity of the communication port of the circulation passage formed in only one of the bottom walls.

Then, if bubbles are generated from the air diffuser, the position of the air diffuser is configured to generate a swirl flow of the water to be treated that does not directly face the partition wall in the gas chamber.
The lower end of the front wall of the guide wall is bent toward the gas chamber side, and the tip is separated from the partition wall in the settling chamber and the bottom wall of the settling chamber.

Therefore, sludge settled near the center of the bottom wall of the settling chamber, by the water to be treated flowing down into the gas chamber at a high flow rate from the communication port by descending the circulation channel formed by the guide wall and the partition wall,
It can be smoothly drawn into the air chamber.

At this time, the bent portion at the lower end of the front wall of the guide wall is configured so that the virtual extension line of the tip intersects with the bottom wall on the side of the flank chamber including the arrangement position of the partition wall. Moreover, the width of the guide wall in the left-right direction is slightly narrower than the communication port at the lower end thereof.

Therefore, the turbulent flow generated when the water to be treated that descends the circulation flow path hits the wall surface is generated in the gas chamber, and it has the effect of raising sludge settling in the sedimentation chamber as much as possible. Can be avoided.

Further, at the lower end of the circulation flow path, the width of the guide wall in the left-right direction at the lower end is slightly narrower than that of the communication port, and at the portion of the communication port where the guide wall is not provided, the swirling flow of the treated water A volume of water to be treated, which is approximately the same as the volume of sludge drawn into the steam chamber, flows from the steam chamber to the settling chamber.

Therefore, at the bottom of the settling chamber, a gentle swirling flow that flows in from both left and right sides of the formed circulation channel, that is, from both left and right sides of the bottom wall, and flows out from the center of the bottom wall into the gas chamber. Of the sludge, and the sludge trying to accumulate on the left and right sides of the bottom wall of the settling chamber is drawn into the steam chamber along with the sludge settling near the center of the bottom wall of the settling chamber due to the swirling flow in the settling chamber. Becomes Furthermore, even if sludge accumulates on the left and right sides of the bottom wall of the sedimentation chamber and solidifies, the sludge is softened by the treated water that flows into the sedimentation chamber from the left and right sides of the bottom wall of the sedimentation chamber. It will be scrapped and will be smoothly drawn into the vent chamber along with the sludge that settles near the center of the bottom wall of the settling chamber.

Therefore, the septic tank according to the present invention can smoothly draw sludge settling in the settling chamber into the bubbling air chamber while avoiding soaring as much as possible. Sludge that easily accumulates can be smoothly drawn into the aeration chamber.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

In the septic tank 11 of the embodiment shown in FIGS. 1 to 3, the gas chamber A is connected to the front part of a precipitation separation tank (not shown). And
The precipitation chamber B is adjacent to the front of the aeration chamber A and is separated by a partition wall 12 having a generally rectangular communication port 13 at the center of the lower end.

The air chamber A includes a top wall 21, left and right side walls 22 and 23, and a bottom wall 24.
Equipped with a diffuser tube in the center of the bottom in a direction substantially orthogonal to the partition wall 12.
14 are arranged and configured. Further, in the aeration chamber A, aerobic bacteria are attached at a position lower than the reference water level WL of the water to be treated and at a substantially central position in the vertical direction on the left and right side walls 22 and 23 side excluding the upper part of the diffuser pipe 14. Known filter media for 25
Are arranged.

The partition wall 12 has a substantially rectangular through-hole 16 at the center position in the left-right direction and at a position near the reference water surface WL of the water to be treated in the gas chamber A.
Are formed.

The settling chamber B includes a front wall 51 that covers the front of the through-hole 16 on the settling chamber B side, and side walls 52 and 53 that extend from the left and right sides of the front wall 51 and are connected to the partition wall 12. A guide wall 15 extending to the central portion of 13 is formed.

The lower end of the front wall 51 of the guide wall 15 is bent to the side of the gas chamber A, and the tip is separated from the partition wall 12 in the settling chamber B and the bottom wall 33 of the settling chamber B in the virtual extension line X of the tip. A bent portion 51a is formed to position the intersection point 0 of the gas chamber A with the bottom wall 24 at the position where the partition wall 12 is arranged. In addition, this bent portion 51a
Has a width W smaller than that of the communication port 13.

The guide wall 15 and the partition wall 12 allow the water to be treated in the flash chamber A whose water level has risen due to bubbles generated from the diffuser pipe 14,
Only one circulation channel C is formed to flow in from the through port 16 and return from the communication port 13 to the gas chamber A.

In addition, the settling chamber B has an upper wall 31 and a bottom wall 3 on which the lid 19 is arranged.
3, and a peripheral wall 32 extending upward from the front and left and right side peripheral edges of the bottom wall 33, and the peripheral wall 32 is formed in a shape narrowing toward the periphery of the communication port 13.

Incidentally, 40 is a disinfecting tank for disinfecting the supernatant liquid in the precipitation chamber B that has entered beyond the overflow weir 41 when it is discharged from the discharge port 18, and 42 is a medicine cylinder.

Next, an operation mode of the septic tank 11 will be described.

First, the water to be treated that has flowed from the settling separation chamber (not shown) into the gas chamber A is generated by the bubbles generated from the diffuser pipe 14 and the bottom wall 24.
It rises from the center and divides in the left and right direction on the side walls 22 and 23 side, descends in the filter medium 25, turns at the bottom so that it flows from the left and right direction to the center, respectively, and is attached to the filter medium 25 sequentially. Purified by aerobic bacteria. Also,
A part of the water to be treated enters the circulation channel C from the through hole 16 of the partition wall 12 and is returned to the inside of the gas chamber A from the lower communication port 13.

Then, when new sewage flows into the precipitation separation chamber (not shown), the treated water treated in the precipitation separation chamber flows from the precipitation separation chamber into the aeration chamber A and is pushed by the treated water to aeration. The water to be treated which has been strengthened in the chamber A flows into the settling chamber B through a part of the communication port 13 of the partition 12 of the gas chamber A, and floats up the suspended matter (sludge) that has settled in the settling chamber B. The supernatant liquid of the upper layer is discharged from the discharge port 18 through the disinfection tank 40.

After that, when the inflow of new wastewater into the sedimentation separation chamber is stopped, in this septic tank 11, the peripheral wall 32 extending upward from the front and left and right side peripheral edges of the bottom wall 33 in the sedimentation chamber B surrounds the communication port 13. It is formed in a funnel-like shape that narrows toward the bottom, and sludge settling in the settling chamber B surely gathers in the vicinity of the communication port 13 of the circulation injection channel C formed in only one of the bottom walls 33.

Then, the arrangement position of the air diffuser 14 that is generating bubbles,
It is configured so as to directly generate a swirling flow a of the water to be treated that does not go to the partition wall 12 in the flue gas chamber A, and the bent portion 51a at the lower end of the front wall 51 of the guide wall 15 is Bend to the side of the chamber A, and the tip is the partition wall 12 in the settling chamber B and the settling chamber B.
Since it is separated from the bottom wall 33, the circulation channel C formed by the guide wall 15 and the partition wall 12 descends to the water to be treated flowing from the communication port 13 into the gas chamber A at a high flow rate. Yotsutte
Air chamber A for spattering sludge that settles near the center of the bottom wall 33 of settling chamber B
Can be pulled in.

The water to be treated that descends in the circulation channel C has a higher flow velocity than the water to be treated that descends the sidewalls 22 and 23 of the aeration chamber A because the filter medium 25 has no resistance.

Further, again, the bent portion 51 at the lower end of the front wall 51 of the guide wall 15
a is the bottom wall 24 of the flap chamber A along the virtual extension line X at the tip.
The intersection 0 with and is arranged immediately below the partition wall 12. In addition, the width W of the guide wall 15 in the left-right direction is slightly narrower than that of the communication port 13 at the lower end thereof.

Therefore, the turbulent flow generated when the water to be treated descending in the circulation channel C hits the wall surface is generated in the gas chamber A, and the sludge settling in the sedimentation chamber B is swirled up. You can avoid giving as much as possible.

Further, at the lower end of the circulation channel C, the guide wall 15 has a width W in the left-right direction at the lower end thereof slightly smaller than that of the communication port 13,
At a portion of the communication port 13 where the guide wall 15 is not provided, the treated water in a volume substantially equal to that of the sludge drawn into the flush chamber A by the swirling flow a of the treated water is precipitated from the flush chamber A. Flow into chamber B.

Therefore, at the bottom of the settling chamber B, only one circulation channel C is formed on both the left and right sides, that is, the left and right sides of the bottom wall 33, and flows out from the center of the bottom wall 33 to the vent chamber A. The gentle swirling flow b that occurs is surely generated, and the sludge that is about to be deposited on the left and right sides of the bottom wall 33 of the settling chamber B is swirled in the settling chamber B near the center of the bottom wall 33 of the settling chamber B. It will be smoothly drawn into the vent chamber A together with the sludge that has settled. Further, even if sludge is accumulated and hardened on the left and right sides of the bottom wall 33 of the settling chamber B, the sludge flows into the settling chamber B from the left and right sides of the bottom wall 33 of the settling chamber B. The bottom wall 33 of the settling chamber B is softly broken by the treated water.
With the sludge settled in the vicinity of the center, the sludge will be smoothly drawn into the vent chamber A, and the same effects as those described in the section of the action and effect of the above-described device can be obtained.

In the embodiment, the diffuser pipe 14 of the gas chamber A is arranged so as to be substantially orthogonal to the partition wall 12. However, if the flow of the swirling flow of the water to be treated at the bottom of the gas chamber A is not directly directed to the partition wall 12, the flow velocity of the water to be treated that enters the settling chamber B can be slowed down. Therefore, the fourth
As shown in the figure, the flow a of the water to be treated at the bottom of the gas chamber A
An air diffuser tube 14 may be arranged apart from the partition wall 12 so that the rearward direction is directed from the partition wall 12.

Further, in the embodiment, in the bent portion 51a at the lower end of the guide wall 15, the bottom wall of the flap air chamber A at the virtual extension line X at the tip thereof.
The point where the intersection 0 with 24 is located at the arrangement position of the partition wall 12 is shown. However, at the intersection 0, the turbulent flow generated by hitting the wall surface of the water to be treated descending through the circulation channel C is
Since it does not have to affect the sludge that settles in (1), it may be on the side of the air chamber A where the partition 12 is located.

Furthermore, in the embodiment, the contact flap chamber in which the filter medium 25 is arranged is shown as the flap chamber A, but of course, the effect of the present invention can be obtained even if the filter medium 25 is not arranged.

Furthermore, in the embodiment, the guide wall 15 is formed straight in the vertical direction, but if the width W of the lower end in the horizontal direction is formed to a predetermined dimension, the guide wall 15 is narrowed or widened from the upper side to the lower side. It may be formed in a tapered shape.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a septic tank showing an embodiment of the present invention, a vertical sectional view of a II portion of FIG. 2, and FIG. 2 is a horizontal sectional view of the same embodiment. II-II in Figure 1
FIG. 3 is a vertical sectional view of the same embodiment, and is a III-I line in FIG.
Longitudinal sectional view of II portion FIG. 4 is a longitudinal sectional view showing another embodiment, and FIG. 5 is a sectional view showing a conventional septic tank. 11 ... Septic tank, 12 ... Partition wall, 13 ... Communication port, 14 ... Air diffuser, 15 ... Guide wall, 16 ... Through port, 22/23 ... Side wall, 24 ... Bottom wall, 32 ... Perimeter wall, 33 ... Bottom wall, 51 ... Front wall, 51a ... Bent portion, 52/53 ... Side wall, A ... Dust chamber, B ... Settling chamber, C ... Circulating flow passage, W ... Width, WL ... Standard water surface, X ... Virtual extension line.

Claims (1)

[Scope of utility model registration request] 1. A front part of a flash chamber provided with an air diffuser at the bottom,
A septic tank, which is separated by a partition having a communication port at the center of the lower end and is adjacent to a sedimentation chamber, in the center of the partition in the left-right direction, at a position near the reference water surface of the water to be treated in the gas chamber. A through-hole is formed, and the settling chamber includes a front wall covering a front side of the through-hole on the settling chamber side, and side walls extending from both left and right sides of the front wall and connected to the partition wall, The width of the lower end in the left-right direction is made slightly narrower than that of the communication port, and a guide wall extending to a central portion of the communication port is disposed. The guide wall has a lower end on the front wall that bends toward the vent chamber. A bent portion that crosses the virtual extension line of the tip with the bottom wall on the side of the gas chamber including the position where the partition is arranged, with the tip being separated from the partition wall in the precipitation chamber and the bottom wall of the precipitation chamber. And the guide wall is formed by the partition wall and the treatment chamber in the flash chamber. Only one circulation flow path is formed to allow water to flow in from the through port and return to the flash chamber from the communication port, wherein the air diffuser pipes the flow of the water to be treated at the bottom of the flash chamber. From the left and right side walls of the air chamber to the center,
It is arranged substantially orthogonal to the partition wall, or is arranged apart from the partition wall so as to direct the flow of the water to be treated at the bottom of the flash chamber from the partition wall to the bottom wall of the precipitation chamber. A peripheral wall extending upward from the front and left and right lateral edges is formed in a shape narrowing toward the periphery of the communication port.