JPH04367791A - Purification tank - Google Patents

Abstract

PURPOSE:To make it possible to adjust the volume of an air flow easily so that a well balanced aeration can be performed using a pair of air dissipation pipes by providing the air dissipation pipes which dissipates air from an air feeder pipe to a contact aeration tank at different elevations and further, providing a valve for air flow adjustment in a connection pipe connected to the air dissipation pipe at a higher elevation. CONSTITUTION:The first and the second connection pipe 1, 2 which connect a pair of air dissipation pipes D1, D2 for dissipating air from a feeder pipe 3 so that the dissipation pipes communicate with the air feeder pipe individually, are provided on a contact aeration tank E. The air dissipation pipes D1, D2 are installed at different levels on their respective positions. In addition, a valve for air flow adjustment 4 is installed on the first connection pipe 1 of two connection pipes, that is, the first connection pipe 1 connected to the air dissipation pipe D1 located at a higher level and the second connection pipe 2 connected to the air dissipation pipe D2 at a lower level. Subsequently, the volume of an air flow can be easily adjusted so that a well balanced aeration is achieved using the air dissipation pipes. Thus untreated water can be biologically treated with high efficiency.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank in which a contact aeration tank is provided with a pair of aeration pipes for diffusing air from an air supply pipe.

0002

[Prior Art] Conventionally, in this type of septic tank, the above-mentioned
A common connecting pipe was provided to connect the pair of air diffuser pipes to the air supply pipe, and the mounting positions of the pair of air diffuser pipes were at the same height from the bottom of the septic tank.

0003

[Problems to be Solved by the Invention] However, when installing a septic tank, it is difficult to install the tank itself strictly horizontally, and the tank may be installed at a slight incline. In such a case, the heights of the pair of air diffusers are different, so that the amount of air diffused in the lower one is smaller than the amount of air diffused in the higher one. As a result, the flow of the water to be treated in the contact aeration tank becomes uneven, and sludge and microorganisms adhere to the contact material in the low flow rate region, causing blockage of the contact material, reducing the efficiency of biological treatment. It also causes sludge accumulation and scum in the settling tank. The purpose of the present invention is to prevent the septic tank from being installed in a slightly inclined position, or
Even if there is some manufacturing error in the spacing or size of the aeration holes of both aeration pipes, it can be easily adjusted so that aeration by both aeration pipes is performed in a well-balanced manner, and as a result, biological treatment can be carried out efficiently. Our goal is to provide a septic tank that can

0004

[Means for Solving the Problems] In order to achieve this object, the septic tank according to the present invention has a characteristic configuration that includes a pair of first and second connecting pipes that separately connect the pair of air diffuser pipes to the air supply pipe. a height difference is provided at each mounting position of the pair of air diffuser pipes, and the first connecting pipe is connected to the air diffuser pipe at a higher position, and the second connecting pipe is connected to the air diffuser pipe at a lower position. Among these, the first connecting pipe is provided with an air flow rate adjusting valve.

[0005]

[Function] In other words, by intentionally creating a height difference between the installation positions of the pair of diffuser pipes, the height relationship between the two diffuser pipes will not be reversed, even if the septic tank is slightly tilted, for example, when installing the septic tank. You can do it like this. If such a difference in height is provided, when performing aeration, the water pressure in the diffuser pipes in the high position is lower than the water pressure in the diffuser pipes in the lower position, so the amount of air diffused from the diffuser pipes in the higher position is lower. This will be larger than the amount of air diffused from the diffuser pipe at the location. Therefore, of the first connecting pipe connected to the aeration pipe at a high position and the second connecting pipe connected to the aeration pipe at a low position, only the first connecting pipe is provided with a flow rate adjustment valve. By throttling this, the flow rate of the aeration air supplied from both the aeration pipes can be maintained in a well-balanced manner. That is, there is no need to provide a flow rate regulating valve in the second connecting pipe.

[0006]

[Effects of the Invention] Therefore, even if the septic tank is tilted to some extent during installation, if the height relationship of both diffuser pipes is not reversed, it is necessary to keep both diffuser pipes at the same height as in the conventional configuration. There is no need to maintain the septic tank strictly horizontal when installing it to match the level, and the installation work is easy. It is also possible to install both the diffuser pipes at the same level and connect a separate connection pipe to each diffuser pipe, but in this case, after the installation is complete, the septic tank is filled with water and aerated. If not, it would be impossible to determine which diffuser pipe would diffuse a larger amount of air, so at the installation stage, both connecting pipes would have to be provided with adjustment valves. In the case of
Since the air diffuser pipe at the higher position is uniquely determined, a flow rate adjustment valve is provided only on the first connection pipe connected to this, and by simply adjusting this flow rate adjustment valve, the air can be supplied from both air diffuser pipes. The flow rate of air for ventilation can be maintained in a well-balanced manner. In other words, if the septic tank is installed in a slightly tilted position, or if there is some manufacturing error in the spacing or size of the diffuser holes of both the diffuser pipes, or if there is some horizontal error in the installation of the diffuser pipe holder, Even if there is, it is possible to provide a septic tank that can easily adjust the flow rate with just one flow adjustment valve so that aeration can be well-balanced, and that can perform biological treatment efficiently. Moreover, since there is no need to provide a flow rate adjustment valve in the second connecting pipe, the product cost can be reduced.

[0007]

[Embodiment] An embodiment of the present invention will be described below based on the drawings. As shown in the plan view, vertical side view, and vertical front view in FIGS. 1, 2, and 3, from the upstream side, the first anaerobic filter bed tank
A septic tank is constructed by providing a chamber N1, a second anaerobic filter bed chamber N2, a contact aeration tank E, and a settling tank P. The first and second chambers N1 and N2 of the anaerobic filter bed tank are provided with filter beds F1 and F2 for cultivating anaerobic microorganisms that anaerobically decompose organic matter in the water to be treated and fixing the biofilm thereon. Aeration is not performed in the first and second chambers N1 and N2 of the anaerobic filter bed tank. The contact aeration tank E is equipped with a contact material C for cultivating and fixing aerobic microorganisms that oxidize and decompose organic matter and ammonia nitrogen in the water to be treated, and a circulating flow of the water to be treated is provided in the contact aeration tank E. While bringing the water to be treated containing organic matter into good contact with the aerobic microorganisms grown and settled on the contact material C, aeration air is supplied to constantly provide the aerobic microorganisms with the necessary oxygen. Diffuser pipe D1 having a large number of holes,
In addition to D2, backwash pipes R1 and R2 are also provided for supplying backwash air to prevent the contact material C from being clogged with excessive biofilm or sludge. The water to be treated from the contact aeration tank E is advected to the sedimentation tank P from the bottom, and the supernatant liquid from the sedimentation tank P is discharged from the discharge pipe 11 via the disinfection tank S. With the flow rate of the water to be treated flowing in from the inflow pipe 10, the water to be treated rises from below the filter bed F1 of the first chamber N1 of the anaerobic filter bed tank and overflows to the second chamber N2 side of the anaerobic filter bed tank, A pair of advection pipes L1 and L2 are connected to the partition wall 5 between the anaerobic filter bed tank first chamber N1 and the anaerobic filter bed tank second chamber N2 so that the flow of the septic tank is naturally advected under the filter bed F2. Overflow portions V1 and V2 are provided symmetrically with respect to the center line in the road direction, and overflow portions V1 and V2 are provided above the advection tubes L1 and L2. The partition wall 13 between the second chamber N2 of the anaerobic filter bed tank and the contact aeration tank E is provided with an overflow part V3 at one location in the center of the upper part. The contact aeration tank E is provided with a sludge outlet Q rising from the bottom along the downstream partition wall so that a vacuum hose can be easily inserted to clean the sludge accumulated at the bottom. As shown in FIG. 3, the air diffuser pipes D1 and D2 are connected to the air supply pipe 3 through first and second connecting pipes 1 and 2, respectively, and the air diffuser pipes D1 and D2 are connected at respective mounting positions. A height difference is provided between the first connecting pipe 1 connected to the diffuser pipe D1 at a higher position and the second connecting pipe 2 connected to the diffuser pipe D2 at a lower position, only the first connecting pipe 1. An air flow rate adjustment valve 4 is provided at the bottom. The backwash pipe R1,
R2 is formed into a ring shape having a large number of air supply holes,
Diffuser pipe D1 below the contact material and at the higher position
They are provided at a higher position and at the same level as each other, and are connected to the air supply pipe 3 via connecting pipes 5 and 6, each having an on-off valve 7 and 8, respectively. With the above configuration, the amount of air supplied from the diffuser pipes D1 and D2 can be maintained in a well-balanced manner by simply adjusting the flow rate adjustment valve. Normally, backwashing is not performed, so both the on-off valves 7 and 8 may be kept closed. When performing backwashing, only one of the on-off valves 7 and 8 is opened, and only one half of the contact material C is backwashed first, and then only the other is opened and the other half is backwashed. When backwashing is performed, sufficient air flow can be obtained, making it easy to perform backwashing. or,
As mentioned above, both the backwash pipes 7 and 8 are connected to the aeration pipes D1 and D.
Since it is provided at a higher position than 2, the diffuser air will not be supplied during backwashing even if the diffuser air is not stopped by valve operation. Therefore, not only is it easy to operate the valve for backwashing, but there is no need to adjust the flow rate again to maintain the balance between the air supply amounts from the diffuser pipes D1 and D2 even after the backwashing is finished. The contact aeration tank E is provided with an antifoam fixture H for storing and fixing a solid antifoam agent at a position close to the center of the upper part of the partition wall 14 on the downstream side. FIG. 4 is a perspective view of the attached state of the antifoam fixing device H, viewed from the upstream side. The antifoam fixing device H has side and bottom surfaces shaped like a net, and is suspended from the upper end of the partition wall 14.
Two arms having elongated holes and set screws are provided so that the arms can be attached to the upper end of the partition wall 14 so that the height can be changed freely.

[0008]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Fig. 1] A plan view of a septic tank showing an embodiment of the present invention.

[Figure 2]
Vertical side view of a septic tank showing an embodiment of the present invention

[Fig. 3] Longitudinal front view of a contact aeration tank of a septic tank showing an embodiment of the present invention.

[Fig. 4] A perspective view of essential parts showing an embodiment of the present invention.

[Explanation of symbols]

E Contact aeration tank 1 First connecting pipe 2 Second connecting pipe 3 Air supply pipe 4 Flow rate adjustment valve D1 Diffuser pipe D2 Diffuser pipe

Claims (1)

[Claims] 1. A septic tank in which a contact aeration tank E is provided with a pair of aeration pipes (D1) and (D2) for aerating air from an air supply pipe (3), wherein the pair of aeration pipes (D1), (
A pair of first and second connecting pipes (1) and (2) are provided, each of which connects each of the air diffuser pipes (D2) to the air supply pipe (3), and each of the pair of air diffuser pipes (D1) and (D2) Create a height difference in the mounting position,
The first connecting pipe (1) connected to the air diffuser pipe (D1) at a high position and the second connecting pipe (2) connected to the air diffuser pipe (D2) at a low position. A septic tank (1) is equipped with an air flow rate adjustment valve (4).