JPH02222779A - Structure of air quantity control section of septic tank - Google Patents

Abstract

PURPOSE:To prevent the pollution of the final treated water by providing an air quantity control section in the intermediate part of an air piping so that the quantity of the air to be supplied to an air diffusion pipe is controlled. CONSTITUTION:The air piping 13c is disposed upper than a treated water surface h in an aerobic treatment chamber a3. One end of the piping is communicated and connected to an air supply pipe installed on the outside of a septic tank body a and the other end is communicated and connected with the top end of an air vertical pipe 13a. The air quantity control section 50 for controlling the quantity of the air to be supplied to the air diffusion pipe 13b is provided in the intermediate part of the air piping 13c. The quantity of the air to be supplied into the treated water through the air diffusion pipe 13b is then adequately controlled by controlling the control section 50 according to the aerobic decomposition treatment capacity of an aerobic treatment chamber a3, which an aerobic bacteria is increased and the sludge in the treatment chamber a3 by the dead bodies of the aerobic bacteria released from cord-shaped filter media 12b is increased and the consequent pollution of the final treated water released from the septic tank A is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the structure of an air amount adjusting section in a septic tank.

(b) Prior Art Conventionally, as one form of septic tank, there is one described in Japanese Patent Application No. 62-214008 previously filed by the applicant.

In other words, in the above-mentioned septic tank, the aeration pipe of the aeration device is installed in the lower part of the aerobic treatment chamber, and air is supplied to the aeration pipe through the air piping, so that air is diffused into the treated water from the aeration pipe. There are some that perform aerobic treatment.

It is designed to be sent back to the anaerobic treatment room.

(c) Problems to be Solved by the Invention However, in the case of the above-mentioned septic tank, since a fixed amount of air is supplied to the aeration pipe regardless of the aerobic decomposition processing capacity in the aerobic treatment chamber, the aerobic decomposition If excess air is supplied that exceeds the processing capacity, the aerobic bacteria in the aerobic treatment chamber will increase due to excessive aeration, and the aerobic bacteria will detach and become remains, increasing the sludge in the aerobic treatment chamber. However, there was a problem in that the final treated water discharged from the septic tank was contaminated.

(d) Means for Solving the Problems Therefore, in the present invention, an aeration pipe is disposed in the lower part of the aerobic treatment chamber, and air is supplied to the aeration pipe via an air pipe, so that In a septic tank configured to supply air into treated water, an air volume adjustment part structure is provided in a septic tank, in which an air volume adjustment part is provided in the middle of the air piping, and the amount of air supplied to the aeration pipe can be adjusted. That is.

In addition, an air release part with one end open to the outside of the treated water is connected to the air volume adjustment part, and a part of the air supplied to the aeration tube is released from the air release part to the outside of the treated water, thereby controlling the air volume. Another feature is that the adjustment is made.

(E) Embodiment The embodiment of the present invention will be explained in detail based on the drawings. In FIGS. 1 and 2, (A) shows a household septic tank, and the septic tank (8) is the septic tank main body (a). and a lid body (b), and is installed in the middle of a pipe that discharges wastewater from a household toilet, kitchen, etc.

As shown in Figures 1 to 3, the septic tank body (a) is approximately box-shaped with an open top, and the inside is partitioned with partition walls (1), (2), and (3).
By standing up the chambers at regular intervals in the horizontal direction, the interior can be divided into a first chamber (al), a second chamber (al), and an aerobic treatment chamber (
It is divided into five rooms: a3), a sedimentation separation room (a4), and a disinfection room (18), and the first room (al) and the second room (al) constitute an anaerobic treatment room (C).

The first chamber (al) communicates with the upstream side of the sewage discharge pipe (D) via an inlet (4), and the inlet (4) is approximately I
F! T-shaped sewage discharge pipe (D) to the first room (al)
The wastewater (hereinafter referred to as "treated water") flowing into the pipe is guided downward in a curved manner.

In addition, a second chamber (al) is located directly below the inlet (4).
A baffle plate (25) that is inclined toward the side with a lower front and a higher rear is arranged to direct the wastewater flowing in from the inlet (4) along the baffle plate (25) in a downward direction as described below. It is made to fall onto the flowing anaerobic hearth (5). (26) is a baffle plate stay.

In this way, by arranging the baffle plate (25), it is possible to prevent the problem that the treated water passes straight through the first chamber (1a) and the purification process is not performed, and also to prevent the treated water from being purified. Prevention of air entrainment into the first chamber (al) where anaerobic treatment is performed by linear inflow, and prevention of air contact by destruction of the scum layer formed on the treated water surface in the first chamber (al). Efforts are being made to prevent the occurrence of noise.

Further, in the first chamber (al), a downward flow anaerobic hearth (5) is provided at a predetermined interval downward from the inlet (4), and a downward flow anaerobic hearth (5) is provided in the first chamber (al). 5) is a support (6) (6°) fixed to the inner surface of the septic tank body (a) and the partition wall (1).
Upper and lower sill shelves (7) (7°) with lattice-like upper and lower lattice-shaped shelves on the upper and lower sides respectively
is stretched, and P material is filled between the upper and lower furnace material shelves (707').

Furnace materials are made of synthetic resin or other materials shaped to significantly increase surface area and porosity.

The second chamber (al) accommodates an upflow anaerobic hearth (9) inside, and has approximately the same structure as the downflow anaerobic hearth (5), but between the furnace materials. It differs from the hearth (5) in that it has a smaller porosity and a larger surface area. (8
) (8') are upper and lower furnace material fences, (8a) and (8b) are supports.

In particular, the partition wall (1) that divides the first chamber (al) and the second chamber (al) completely partitions the area below the treated water level (h) in the septic tank body (a), and the first chamber (al) The advection of the treated water from the first chamber (al) to the second chamber (al) is carried out through the first chamber (a
The first chamber installed along the sides of the l) side and the second chamber (al) side
・Performed through the second advection tubes (10) and (11).

As shown in Fig. 3, the first and second advection pipes (10) and (11) are each formed in a broken-circuit shape, and are placed at symmetrical positions across the partition wall (1), with one end edge of each of the first and second advection pipes (10, 11) Bulkhead (1)
While keeping the other edge close to the side of the septic tank main body (a)'! Closely close to the inner surface of (20),
The upper and lower ends form a tube body that is open above and below each hearth (5) and (9), respectively, and the partition wall (
1), a substantially square-shaped communication port (21) reaching a position slightly lower than the treated water level (h) from above is cut out to form the first chamber (al
) and the second chamber (a2) 6, and the first and second advection pipes (10) and (11) communicate with the inlet (
4), one set on each side of the partition wall (1) and one set on each side of the partition wall (1), so that the first chamber (al) and the second chamber (a
2) A pair of communication ports (21) on the left and right are also provided,
A movable weir (30) is attached to each communication port (21) so as to be slidable in the vertical direction.

The movable weir (30) is formed into a rectangular plate shape slightly wider than the width of the communication port (21), and has an upper edge (30a).
are formed in a sawtooth shape, and are provided on the inner surface of the side wall (20) of the septic tank body (a) adjacent to the partition wall (1), and on the inner surface of the side wall of the second advection pipe (11) facing the same inner surface. It is fitted into the guide rails (31) (31') so as to be slidable up and down.

Moreover, in the center of the movable weir (30), an adjustment bolt slider (32) is formed vertically from the lower end to the center, and the adjustment bolt slides into the partition wall (1) through the slide groove [32]. (33), and screw a nut (34) with an adjustment knob onto the tip of the adjustment bolt (33) so that the tightening can be freely adjusted.
30) is slid and fixed up and down so that the vertical position can be adjusted. (35) is a fixed plate.

The anaerobic treatment room (a3) has an aerobic hearth (12) and an aeration device (1) inside, as shown in Figures 1, 3, and 4.
3), an air lift pipe (14), and a backwash pipe (15) are built-in.

The aerobic hearth (12) has a frame (12a) that is sunk in the aerobic treatment chamber (a3) at a predetermined distance from the inner bottom surface, and has a center string made of a large number of fibrous P yarns arranged in a substantially tufted shape. A large number of attached and formed string-shaped furnace materials (12b) are supported and are of the same grade? SP material (12b
) by attaching aerobic bacteria to it.

In addition, in the present invention, string-like warm material (
12b) was used, but a corrugated plate shape or a honeycomb shape may also be used.

The aeration device (13) has an air vertical pipe (1
3a) Porous air diffusers (
13b) (13b) are connected in a substantially horizontal manner so that the air supplied to the upper end of the vertical air pipe (13a) via the air pipe (13C) is diffused into the treated water.

The air pipe (13c) is connected to the aerobic treatment chamber (a3).
Inside, the air supply pipe (59) is arranged above the treated water level (h), and one end is connected to the air supply pipe (59) which is piped outside the septic tank body (a), and the other end is connected to the air vertical pipe (59).
The air pipe (13a) is connected to the upper end of the same air pipe (13a).
An air amount adjustment section (50) for adjusting the amount of air supplied to the diffuser pipe (13b) is provided in the middle of C).

The gist of the present invention is that the air adjustment section (50) is provided in the air pipe (13c), and will be explained below based on FIG. 4.

That is, the air amount adjustment section (50) is connected to the air piping (13c
), a pipe-shaped air relief part (51) with one end open to the outside of the treated water is connected in a perpendicular state, and a three-way air relief part (51) is connected to the intersection of the air relief part (51) and the air pipe (13c). An air amount adjustment valve (50a) with a ball valve structure is provided,
A nozzle operating lever (50b) provided outside the air pipe (13c) is connected to the same valve (5(la)), and by operating the same lever (5Qb), air supplied to the diffuser pipe (13b) can be controlled. A portion of the air is taken out from the air relief part (51) so that the amount of air supplied to the diffuser pipe (13b) can be adjusted.In this case, the air is supplied from the air supply pipe (59) to the air pipe (13c). The supply amount can be kept constant at all times.

In this way, the valve operating lever (sob) is operated according to the aerobic decomposition processing capacity of the aerobic processing chamber (a3),
Since the amount of air supplied into the treated water through the aeration pipe (13b) can be adjusted appropriately, aerobic bacteria increase and detach from the string-like P material (12b), and the detached aerobic bacteria The remains become the remains and increase the sludge in the aerobic treatment room (a3), polluting the final treated water discharged from the septic tank (^).
This problem can be prevented from occurring.

Other configurations of the septic tank (^) will be explained below.

The treated water surface (
Convection guide plates +60) (61
), each of the convection guide plates (60, 61) has its lower end fixed to the partition wall (2) with support members (62, 63), and the middle part thereof is curved upward in a convex shape. The upper end is brought close to the treated water surface (h).

Moreover, a constant gap (S) (S) is formed between the lower end of each convection guide plate (60), (61) and the partition wall (2), so that each convection guide plate (60), (61 ) This prevents problems such as solid matter in the treated water remaining on the top and rotting.

The air lift pipe (14) is arranged vertically along the partition wall (2), with its lower end opening above one of the diffuser pipes (13b), and its upper end slightly above the treated water level (h)'. The bottom surface of the water collection basin (14a) arranged in the partition wall (2) is penetrated and opened slightly above the bottom surface, and the water collection basin (14a) is connected to one end of the return pipe (14b) that penetrates the partition wall (2). The other end of the pipe (14b) extends above the first chamber (1a), and the tip of the other end is bent downward to open below the treated water level (h).

In addition, the return pipe (1) located above the second chamber (al)
In the middle part of 4b), there is a notch opening (1) for cleaning inside the pipe.
4f) and a water collection basin (14a) each equipped with a return treated water collection section (40) for measuring the amount of returned treated water.
As shown in Fig. 5, it is formed into a box shape with an open top, and is attached to the top of the bulkhead (2) in a cantilevered manner so that its vertical sliding position can be adjusted freely. A partition plate (14C) is provided on the diagonal of the upstream side, and the partition plate (14C) is
A substantially rectangular water passage hole (14d) is opened in the lower part of c), and the upper end of the air lift pipe (14) is opened on the - side of the partition plate (14c), fl! ! The side is communicated with a return pipe (14b).

In this way, the water collection basin (14
By forming a bypass flow path in a), it is possible to prevent the treated water from directly flowing into the return pipe (14b) from the upper end opening of the air lift pipe (14), suppress pulsation, and constantly supply the treated water. 1
It can be sent to the room (al).

In addition, a substantially rectangular overflow opening (14e) is cut out from above on one side of the water collection basin (14a), and a triangular weir (14e) for communicating with the return pipe (14b) is formed on the other side. 14(1) is formed with a notch.

The amount of returned wastewater can be adjusted by adjusting the vertical sliding position of the water collection basin (14a) connected to the air lift pipe (14). (14h) is a long hole for slide,
(14i) is a mounting bolt, and (14j) is a tightening nut.

In addition, as shown in Fig. 6, a water catchment M (14k) is attached to the upper surface of the water catchment catchment (14a), and a water catchment catchment cover (14k) is attached to the upper surface of the water collection catchment (14a).
4k), the treated water flows directly into the return pipe (14b) from the upper end opening of the air lift pipe (14) over the partition plate (14c). can be prevented.

The backwash pipe (15) connects one end of the ejection pipe (15a), which has a number of ejection holes arranged substantially horizontally below the aerobic hearth (12), to the aerobic treatment chamber (a3) and the sedimentation chamber. A flexible pipe (15c) is connected to the lower end of a backwashing vertical pipe (15b) that is vertically installed along the partition wall (3) between the separation chambers (a4), and the upper end of the backwashing vertical pipe (15b) is connected to a flexible pipe (15c). It is supported in a cantilevered manner and communicated with the air pipe (13c) via the air pipe (13c).

In addition, the partition wall (2) between the second chamber (al) and the aerobic treatment chamber (a3) completely partitions the area below the treated water level (h) of the septic tank body (a). ) to the aerobic treatment chamber (a3), the advection of the treated water is carried out through the second
Third advection installed on the side of the chamber (al)! (16).

The third advection pipe (16) is formed into a substantially U-shaped cross section with upper and lower ends open, and the opening edge of the U-shaped cross section is brought into close contact with the side surface of the second chamber fa2)Ill of the partition wall (2), and the lower end is open above the upward flow anaerobic hotbed (9), and forms a pipe body of a third advection pipe (16) whose upper end is open above the treated water level (h),
A substantially rectangular advection port (16a) is opened in the partition wall (2) to separate the second chamber (al) and the aerobic treatment chamber (a3) into each chamber (al).
It communicates at the top of (a3).

As shown in FIGS. 1 and 3, the sedimentation separation chamber (a4) is configured between the partition wall (3) and the partition wall (22) of the disinfection chamber (18).

The disinfection room (18) is connected to the sedimentation separation room (a4) by the partition wall (22).
It has a generally box-like shape with an open top and is divided from (h), and a drug section support (18a) protruding from the inside surface of the disinfection chamber (18) at a position slightly higher than the treated water level (ho), so that it can be viewed from above. The lower end of the inserted chemical cylinder (igb) filled with a solid disinfectant is supported while being in contact with the treated water advected from the sedimentation separation chamber (a4).

In addition, (19) is a scum outflow prevention plate that protrudes vertically and oppositely from the partition wall (3) to the left and right sides of the disinfection chamber (18), respectively. The container should be placed in close contact with the disinfection chamber, with the upper edge protruding above the treated water surface (h) and the lower edge immersed below the treated water surface (h), so that it does not float to the treated water surface (h) of the sedimentation separation chamber (a4). Scum is prevented from advecting from the sedimentation separation chamber (a4) to the disinfection chamber (18).

Further, the lower edge of the partition wall (3) between the sedimentation separation chamber (a4) and the aerobic treatment chamber (a3) is provided with a predetermined distance (lI) from the inner bottom surface of the septic tank body (a). The inner bottom surface of the sedimentation separation chamber (a4) is steeply inclined downward toward the aerobic treatment chamber (a3).

As shown in FIGS. 1 and 2, the lid body (b) is fixed to a flange (a5) fixed to the upper edge of the septic tank body (a) via bolts (not shown). Or it is adhesively bonded with synthetic resin to close the upper opening of the septic tank main body (a), and the upper position of the partition wall (1) of the septic tank main body [a] and the upper position of the aerobic treatment chamber (a3). The first large diameter
, a second manhole (bl) (b2) is provided so as to be openable and closable, and a third manhole (b3) having a small diameter is provided above the medicine cylinder (18tl) so as to be openable and closable.

Hereinafter, a method for purifying wastewater from a household toilet or kitchen using a septic tank having the above configuration will be described with reference to FIG. 1.

The treated water flowing into the first chamber (al) from the upstream side of the sewage discharge pipe (D) through the inlet (4) and the organic matter (water, carbohydrates, proteins, lipids, urea) contained in the treated water While passing through the downward flow anaerobic hearth (5), the anaerobic hearth (component of ) is subjected to anaerobic decomposition by anaerobic bacteria adhering to the surface of the P material of the downflow anaerobic hearth (5).

That is, first, the organic matter in the treated water is reduced to a low molecular weight by acid-producing bacteria and converted into acetic acid (CH3C00I+) and penionic acid (
CHa C82C0OH), etc., and then
Anaerobic bacteria such as methane bacteria decompose aerobic acids to produce methane (CtL+) and carbon dioxide (CO2),
These gases are discharged to the outside of the septic tank (^), and treated water containing ammonia nitrogen (NH4''-N), which is a decomposition product of protein and the nitrogen component of urea, is generated.

Incidentally, coarse solids contained in the treated water that has passed through the downward flow anaerobic P bed (5) settle at the bottom of the first chamber (al).

By performing such anaerobic treatment, organic matter can be effectively removed from the treated water, and as a result, the treated water after anaerobic treatment contains ammonia nitrogen (NH4''-
N) and a small amount of untreated organic matter in the first chamber (a
l) to the second chamber (a2).

That is, the treated water after the anaerobic treatment passes through the first advection pipe (10) and the second advection pipe (11), and flows downward to the anaerobic hearth (9) in the second chamber (a2). It is directly transferred to the hearth (9) without any anaerobic treatment.

After that, while passing through the upward flow anaerobic bed (9) from bottom to top, it undergoes the same anaerobic decomposition as described above, further decomposes organic matter, and then ammonia (NH4
-N) and a further small amount of untreated organic matter is transferred to the next aerobic treatment chamber (a3) via the third advection pipe (16).

Therefore, in this example, the anaerobic treatment in the second chamber (a2) of the anaerobic treatment chamber (C) is performed by passing the treated water through the upward flow anaerobic P bed (9) from bottom to top. By using an upward flow that passes through the anaerobic P bed from the top to the bottom, the flow rate can be lowered, and more undecomposed substances can be transferred to the hot bed. It can be moored and anaerobic decomposition can be further promoted.

Therefore, in conjunction with the anaerobic treatment in the first chamber (al),
The anaerobic treatment in the entire anaerobic treatment chamber (C) can be performed efficiently and sufficiently to reduce the generation or residual of undecomposed 8S-containing products as much as possible.

In addition, the acid-producing bacteria and anaerobic bacteria in the above anaerobic treatment are
Although it is possible to wait for the growth of acid-producing bacteria or anaerobic bacteria that have entered the treated water from the environment before using them, it is preferable to inoculate with a proven and excellent starter strain.

In addition, 1. Send the treated water anaerobically treated in the first chamber (al) of the anaerobic treatment chamber (C) directly to the bottom of the second chamber (a2), and do not send it to the top of the second chamber (a2). , undecomposed substances may remain in the upper part of the upward flow anaerobic hotbed (9) or in the second chamber (
It is possible to reliably prevent the water from flowing directly from a2) into the aerobic treatment chamber (aj) installed in parallel with the second chamber (a2).

Next, the purification process in the aerobic treatment chamber (aj) will be explained. In the aerobic treatment chamber (aj), air is blown into the treated water from the aeration pipe (13b) of the aeration device (13). Oxidative decomposition is performed by aerobic bacteria such as nitrifying bacteria that utilize the oxygen in the air, and ammonia nitrogen (N114''-N) in the treated water is converted to nitrate nitrate (NO2
-N) and nitrite nitrogen <802-N).

In addition, it is preferable to inoculate aerobic bacteria with proven seed bacteria as described above, and the aerobic hearth (12) can be used to increase the bacterial concentration by attaching such aerobic bacteria and causing the aerobic bacteria to flow out. This is to ensure that there is no decline in

Furthermore, in this example, all of the treated water that has been subjected to the anaerobic treatment and aerobic treatment is subjected to aerobic decomposition treatment in the aerobic treatment room (aj) without being directly discharged outside the septic tank (A). A part of the treated water (Q2) is transferred to the air lift pipe (14
) from below from the air diffuser pipe (13b) causes the same air lift'! '(14) is lifted into the water collection basin (14a), separated into gas and liquid in the same water collection basin (14a), and then returned to the first chamber (al) via the return pipe (14c). I try to do that.

However, nitrate nitrogen (NO3-N) and nitrite nitrogen (
When the treated water containing NO2--N) flows into the first chamber (aj), the denitrifying bacteria present in the first chamber (al) utilizes the oxygen of these inorganic compounds and flows into the first chamber (al). It decomposes organic matter that enters the body to obtain energy for survival. As a result, inorganic compounds are reduced to molecular nitrogen (N2)
The organic carbon is decomposed into carbon dioxide (CO2) and released outside the septic tank (A).

In this way, the decomposition treatment of R substances in the first chamber (al) can be carried out not only by anaerobic treatment but also by partially refluxed water from the aerobic treatment chamber (aj) and denitrifying bacteria acting on it. can.

Therefore, it is possible to suppress the excessive increase in ammonia nitrogen (NH4''-N) that occurs when performing anaerobic treatment using only anaerobic bacteria (this works in the direction of suppressing the activity of anaerobic bacteria), and Due to this suppressing effect, the activity of the anaerobic bacteria can be maintained in a suitable state at all times, and the decomposition treatment of organic matter in the anaerobic treatment chamber (C) can be dramatically improved.

In addition, by improving the ability to decompose organic matter, it is possible to significantly reduce the amount of untreated organic matter contained in the treated water sent from the anaerobic treatment chamber (C) to the aerobic treatment chamber (aj). The aerobic treatment room caused by the same untreated organic matter (
The generation of sludge in aj) can also be reduced as much as possible.

On the other hand, nitrate nitrogen (NOa--N) and nitrite nitrogen (NO2-N) in the treated water in the aerobic treatment room (aj)
The concentration of N2 is also reduced by refluxing a part of the treated water to the anaerobic treatment chamber (C) and converting those ions into molecular nitrogen [N2] by denitrifying bacteria.
) and nitrous oxide (N2(1)), so it can be reduced as much as possible.

In this way, the treated water that has undergone aerobic decomposition is separated from the partition wall (3
), flows into the lower part of the sedimentation separation chamber (a4), rises while precipitating extremely small amounts of solid matter remaining in the treated water, flows into the disinfection chamber (18), and flows into the chemical section ( 1
8b) The treated water is disinfected and sterilized by the solid disinfection method that gradually flows out from the inside, and is then discharged from the outlet (17) to the downstream side of the treated water discharge pipe.

In addition, by making the sedimentation separation chamber (a4) a riser type, sludge brackets are generated and can be collected even with relatively light specific gravity and small flocs.
) is steeply sloped downward in the direction of the aerobic treatment chamber (a3), so that the settled sludge in the sedimentation separation chamber (a4) is moved to the bottom of the aerobic treatment chamber (a3). There is.

In this way, the final treated water that is purified from the domestic toilets, kitchens, etc. and discharged to the downstream side of the treated water drainage pipe is stored in the aerobic treatment room (a3). Since a part of the treated water is refluxed, the BOD concentration and nitrogen concentration can be significantly reduced.

According to experiments conducted by the present applicant, the BOD concentration etc. in the final treated water obtained by the septic tank (^) according to this example were as shown in the table below.

Note that the numerical values are expressed as average values.

Unit (II (J/J)) As is clear from the above table, in the case of this example, BOD: a degree etc. can be significantly reduced compared to the conventional septic tank.

In addition, the amount of treated water flowing into the anaerobic treatment chamber (C) is (Q
l), if the partial recirculation amount from the aerobic treatment chamber (a3) to the anaerobic treatment chamber (C) is (Q2), then the anaerobic treatment chamber (C)
The appearance of the treated water (0
3) becomes Q3 = 01 + 02, but Ql: Q
It has been found that it is preferable to set the ratio of 2=1:1 to 10 (suitably 1:2 to 6 in ft).

By the way, since non-degradable solids such as synthetic fiber fragments, sand grains, and synthetic resin film fragments may be mixed in the initial inflow treated water, it is inevitable that each chamber of the septic tank (a), i.e. Sludge consisting of undecomposed solid matter or remains of exfoliated bacteria is deposited in the first chamber (al), second chamber (a2), and aerobic treatment chamber (a3).

In this case, the first and second manholes (11
1) Open (b2) and connect the first and second advection tubes (10) (11
) as a passage, the first chamber (al) and the second chamber (a2
), a vacuum hose for sucking up solids and sludge can be easily inserted into the bottom of the sedimentation separation chamber (a4). It also absorbs solid matter at the same time. Also, the third
By opening the manhole (b3), the medicine cartridge (18b) can be easily replaced.

In addition, excess sludge adheres to the aerobic r bed (12), but by operating the three-way ball valve (55), the backwash pipe (15)
) and eject air from the ejection pipe (15a),
By manually swinging the ejection pipe (15a) via the flexible pipe (15c), the excess sludge can be reliably washed away.

(F) Effect In the present invention, since the air volume adjustment part and the air release part are provided in the middle of the air pipe that supplies air to the aeration pipe, the air volume adjustment part can be operated according to the aerobic decomposition processing capacity. By doing so, it is possible to adjust the amount of air supplied into the treated water through the aeration pipe, which increases the number of aerobic bacteria, which detaches and becomes remains, increasing the amount of sludge in the aerobic treatment room. and contaminate the final treated water discharged from the septic tank.
This problem can be reliably prevented from occurring.

In addition, by connecting an air relief part with one end open to the outside of the treated water to the air amount adjustment part, a part of the air supplied to the diffuser pipe can be released from the air relief part to the outside of the treated water. Even if the amount of air supplied to the air pipe is constant, it is possible to adjust the amount of air supplied from the aeration pipe to the treated water.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a septic tank equipped with an air amount adjustment structure according to the present invention. FIG. 2 is a sectional view taken along the line II in FIG. 1. FIG. 3 is a plan view of the septic tank body. FIG. 4 is a plan view of the aerobic treatment chamber. Figure 5 is a perspective view of the water collection basin. FIG. 6 is a perspective view of a water collection basin as an example of a pond. : Septic tank: Anaerobic treatment chamber: 1st chamber: 2nd chamber Aerobic treatment chamber Sedimentation separation chamber Partition wall 1st advection tube 2nd convection tube Disinfection chamber Air volume adjustment section

Claims (1)

[Claims] 1) A diffuser pipe (13b) in the lower part of the aerobic treatment chamber (a3)
By arranging the aeration tube (13b) and supplying air to the aeration tube (13b) via the air piping (13c), the aeration tube (13b)
In a septic tank configured to supply air into the treated water, an air amount adjustment section (50
) in a septic tank, which makes it possible to adjust the amount of air supplied to the diffuser pipe (13b). 2) An air release part (51) having one end opened to the outside of the treated water is connected to the air amount adjusting part (50) according to claim 1,
A structure of an air amount adjustment section in a septic tank, characterized in that the amount of air is adjusted by releasing a part of the air supplied to the air diffuser pipe (13b) to the outside of the treated water from the air release section (51). .