JPH02222778A - Baffle plate structure for septic tank - Google Patents

Abstract

PURPOSE:To improve an anaerobic treatment capacity by disposing a baffle plate right below an inflow port in the state of accepting the inflow sewage from the inflow port, once receiving the sewage by this baffle plate and allowing the sewage to flow downward to a purifying section. CONSTITUTION:The baffle plate 25 is formed to a rectangular shape broader than the aperture diameter of the inflow port 4 and is mounted to the front end of a baffle plate stay 26 extended from the front wall of a septic tank body to just below the inflow port 4. The side of the front end edge 25a of the plate 25 is positioned in proximity to the inflow port 4 and the rear end edge 25b side is inclined to be high on the front and low in the rear near the center of the 1st chamber (a1) and in proximity to the surface (h) side of the water to be treated. The water to be treated flowing into the 1st chamber (a1) from the inflow port 4 is dropped onto a downward current anaerobic filter bed 5 along the plate 25 in this way and, therefore, the water to be treated is prevented from passing linearly in the filter bed 5. The anaerobic treatment of the water to be treated by the filter bed 5 is surely executed and the solids in the inflow water to be treated are dispersed by the plate 25. The anaerobic treatment efficiency is thus well assured. The destruction of the scum layer formed on the surface (h) of the water to be treated is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a baffle structure in a septic tank.

(b) Conventional technology Conventionally, as a form of septic tank, an inlet is provided on one side of the septic tank body to communicate with the upstream side of the sewage discharge pipe.
Full of the same septic tank body! ! A discharge port is provided on the side that communicates with the downstream side of the sewage discharge pipe, and the sewage that flows into the septic tank body from the inlet is processed into a shed by the septic processing unit installed in the septic tank body, and is then drained from the discharge port. Some are configured to discharge water downstream of the water pipe.

(c) Problems to be Solved by the Invention However, in the case of the above-mentioned septic tank, there were the following problems.

■There was a risk that a large amount of sewage would flow straight into the septic tank body, pass through the purification treatment section, and no purification treatment would be carried out at all.

■When sewage flows straight into the septic tank body, there is a risk of air being drawn into the septic tank, and when anaerobic treatment is performed in the septic tank, the sewage may be mixed in with such air. There was a problem in that the amount of dissolved oxygen inside increased, suppressing the activity of anaerobic bacteria.

■The sewage flowing in a straight line destroys the scum layer formed on the sewage surface inside the septic tank, and the scum layer no longer functions to prevent air contact, reducing the anaerobic treatment capacity. There was a problem.

■There was a problem in that the sewage flowing in a straight line collided with the sewage accumulated inside the septic tank body, causing noise.

(d) Means for Solving the Problems Therefore, in the present invention, an inlet communicating with the upstream side of the sewage discharge pipe is provided on one side of the septic tank body, and a sewage discharge pipe is provided on the other side of the septic tank body. A discharge port is provided that communicates with the downstream side of the septic tank, and the sewage flowing into the septic tank body from the inlet is purified by a purification processing unit provided in the septic tank body, and then flows from the discharge port to the downstream side of the sewage discharge pipe. In a septic tank configured to discharge water, a baffle plate is placed directly below the inlet to catch the inflowing sewage from the inlet, and the baffle plate is used to temporarily catch the sewage and allow it to flow down to the purification treatment section. The present invention aims to provide a baffle plate structure for a septic tank constructed by the present invention.

Another feature is that the baffle plate is inclined toward the outlet side with a lower front and rear height.

(Po) 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 (A) is a 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).
The interior is divided into a first chamber (al), a second chamber (a2), 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 (a2) 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 horizontally shaped and communicates with the upstream side of the sewage discharge pipe (D). ) The sewage water (hereinafter referred to as "treated water") flowing into the first chamber (al) is guided downward in a curved manner.

In addition, a baffle plate (25) is provided directly below the inlet (4) to catch the wastewater flowing in from the inlet (4), and the baffle plate (25) temporarily catches the wastewater. It is made to flow down into the first chamber (al) serving as a purification processing section.

This baffle plate (25) constitutes the gist of the present invention, and will be explained below based on FIGS. 1, 3, and 4.

That is, the baffle plate (25) is formed into a rectangular shape wider than the opening diameter of the inlet (4), and extends from the front wall (21) of the septic tank body (a) to just below the inlet (4). It is attached to the tip of the baffle plate stay (26).

The baffle plate (25) has a front edge (25a) close to the inlet (4), and a rear edge (25b)
! is inclined toward the center of the first chamber (al) and close to the treated water surface (h) with a high front and a low rear.

As described above, since the baffle plate (25) is disposed directly below the inlet (4), the following effects are produced.

That is, the treated water flowing into the first chamber (al) from the inflow r:I (4) is caused to fall onto the downward flow anaerobic hearth (5), which will be described later, along the baffle plate (25). As a result, it is possible to prevent the treated water from passing straight through the downward flow anaerobic hearth (5).
The anaerobic treatment of the treated water according to 5) can be reliably performed. In particular, baffle plates (25
) to ensure good anaerobic treatment efficiency.

Moreover, the first chamber (
al) to prevent the occurrence of problems such as the amount of dissolved oxygen in the treated water increasing and the activity of anaerobic bacteria being suppressed by preventing air from being entrained in the treated water; Can be done.

Furthermore, it is possible to prevent the occurrence of a problem in which the scum tank formed on the treated water surface (h) in the first chamber (al) is destroyed by the treated water flowing linearly. It is possible to satisfactorily ensure that the treated water in the first chamber (al) is prevented from coming into contact with air, and to satisfactorily ensure the anaerobic treatment capacity in the first chamber (al).

Moreover, since the treated water does not directly collide with the treated water accumulated in the first chamber (al) when it falls, it is possible to prevent the generation of noise.

Other configurations of the septic tank (A) will be described below.

Further, in the first chamber (al), a downward flow anaerobic P bed (5) is provided at a predetermined interval downward from the inlet (4), and an upward flow anaerobic P bed (5) is provided in the first chamber (al). ) is a support (6) (6°) fixed to the inner surface of the septic tank body (a) and the partition wall (1).
Upper and lower P material shelves (7) (7°) with lattice-like patterns on the top and bottom of the
The furnace material is filled between the upper and lower furnace material shelves (7) (7 degrees).

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

The second chamber (a2) houses an upward flow anaerobic hearth (9), and has approximately the same structure as the above-mentioned downward flow anaerobic hearth (5). This differs from the r-bed (5) in that the porosity is smaller and the surface area is larger. (8
) (8°) are upper and lower furnace material shelves, (8a) and (8b) are supports.

In particular, the partition wall (1) that divides the first chamber (al) and the second chamber (a2) completely partitions the area below the treated water level (h) in the septic tank body (a), and the first chamber ( Advection of the treated water from the first chamber (a2) of the partition wall (1) to the second chamber (a2)
1) side and the 2nd chamber (a2) side.
・Performed through the second advection tubes (10) and (11).

As shown in FIG.
Place one edge of each partition wall (1
), the other edge of each was brought into close contact with the inner surface of the side wall (20) of the septic tank body (a), and the upper and lower ends were open above and below each r floor (5) and (9), respectively. A partition wall (1) between each advection tube (10) (11)
), 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) are communicated with each other.

The first and second advection pipes (10) and (11) are
A partition wall (
1), one set each on the left and right sides, a total of 2 #Jl are arranged, and the first room (
There are also a pair of left and right communication ports (21) that communicate between the communication ports (21) and the second chamber (a2), and each communication port (21) has a movable weir (3).
0) is installed so that it can be slid up and down.

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).
It is formed into a serrated shape, and the distance is S! Guide rails (31) (31°) provided on the inner surface of the side wall (20) of the septic tank body (a) adjacent to (1) and on the inner surface of the side wall of the second advection pipe (11) facing the same inner surface. It is fitted in so that it can slide up and down freely.

Furthermore, an adjustment bolt sliding groove (32) is formed vertically in the center of the movable weir (30) from the lower end to the center, and the adjustment bolt slides through the sliding groove (32) and attaches to the partition wall (1). (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.

As shown in FIGS. 1, 3, and 5, the aerobic treatment chamber (a3) has an aerobic hearth (12) and an aeration device (1) inside.
3), an air lift pipe (14), and a backwash pipe (15) are built-in.

The aerobic P bed (12) has a frame (12a) sunk in the aerobic treatment chamber (a3) at a predetermined distance from the inner bottom surface, and a large number of fibrous strings attached to the center string in a substantially tufted shape. It is constructed by supporting a large number of string-like swamp members (12b) formed by

In addition, as a furnace material for an aerobic r-bed, the present invention uses string-like furnace material (
12b) was used, but a corrugated plate shape or a honeycomb shape may also be used.

The aeration device (13) has a second chamber (a2) and an aerobic treatment chamber (
Air vertical pipe (13) installed vertically along the partition wall (2) between a3)
a) Porous air diffusers (1
3b) (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.

In the middle of the air pipe (13c), there is a diffuser pipe (1
3b), and a three-way ball valve (50) for switching and supplying the air supplied to the diffuser pipe (13b) to the backwash pipe (15), which will be described later. 55).

In addition, convection guide plates (6
0) (61) are arranged, and each convection guide plate (60)
(61) is a supporting member whose lower end is attached to the partition wall (2)! 62)(
63), and the midway portion is curved upward in a convex manner to bring the upper end 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), and each convection guide plate (60) (61) This prevents problems such as solid matter in the treated water remaining on 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 of the installed water collection basin (14a) is penetrated and opened slightly above the bottom, and the water collection basin (14a) is connected to the partition wall (
2), the other end of the return pipe (14b) is extended to the upper part of the first chamber (1a), and the tip of the other end is bent downward. It is opened below the treated water surface (h).

In addition, the return pipe (1) located above the second chamber (a2)
In the middle part of 4b), there is a notch opening (1) for cleaning inside the pipe.
4f) and a return treated water collection section (40) for measuring the amount of returned treated water.

As shown in Fig. 6, the water collection basin (14a) 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. A partition plate (14c) is provided on the diagonal line on the upper right side in plan view, and a substantially rectangular water passage hole (14c) is provided at the bottom of the partition plate (14c).
d), the upper end of the air lift pipe (14) is opened on one side of the partition plate (14c), and the return pipe (14) is opened on the other side.
b).

In this way, the water collection basin (14C) is separated by the partition plate (14C).
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 (14c) is cut out from above on one side of the water collection basin (14a), and a triangular weir (14c) 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 adjustment nut.

Moreover, as shown in FIG. 6, on the upper surface of the water collection basin (14a), there is a water collection basin 1! (14k) and the same collection Mizumasuwaka (
By closing the upper surface of the water collection basin (14a) with the air lift pipe (14k), the treated water flows from the upper end opening of the air lift pipe (14) over the partition plate (14c) to the return pipe (14b).
can be prevented from directly flowing into the

The backwash pipe (15) connects one end of the jet pipe (15a), which has a large number of jet holes arranged substantially horizontally below the aerobic stream bed (12), to the aerobic treatment chamber (a3) and the sedimentation chamber. A flexible pipe (15C ) via the air pipe (13c)
They are supported in a cantilevered manner and communicated with each other.

In addition, the partition wall (2) between the second chamber (a2) and the aerobic treatment chamber (a3) completely partitions the area below the treated water level (h) of the septic tank body (a), and the second chamber (a2) ) to the aerobic treatment chamber (a3), the advection of the treated water is carried out through the second
This is carried out by a third advection pipe (16) provided on the side surface of the chamber (a2).

The third advection pipe (16) is formed in a substantially U-shaped cross section with open upper and lower ends, and the opening edge of the U-shaped cross section is brought into close contact with the side surface of the partition wall (2) on the second chamber (a2) side. A third advection tube (16) whose lower end opens above the upward flow anaerobic hearth (9) and whose upper end opens above the treated water level (h) is formed, and is connected to the partition wall (2). The substantially rectangular advection port (16a) is opened and the second
The chamber (a2) and the aerobic treatment chamber (a3) are separated into each chamber (a2) (
It communicates at the top of a3).

As shown in FIGS. 1 and 3, the sedimentation separation chamber (a4) is composed of a partition wall (3) and a space between 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 box shape with an open top and one side is brought into close contact with the inner surface of the side wall of the septic tank body (a) to communicate with the discharge port (17), and the upper edge (18c) of the disinfection chamber (18) is connected to the treated water surface. (h), and a drug part support (18a) is provided protrudingly at a position slightly higher than the treated water level (h) on the inner surface of the disinfection chamber (18). The lower end of the chemical cylinder (18b) filled with a solid disinfectant inserted from the container 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 is vertically opposed and protrudes from the partition wall (3) on both the left and right sides of the disinfection chamber (18), and the scum outflow prevention plate (19) disinfects the sides. The upper edge protrudes above the treated water surface (h) and the lower edge is immersed below the treated water surface (h) to prevent scum from floating on the treated water surface (h) of the sedimentation separation chamber (a4). 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 tn) 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 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
, the second manhole (bl) (b2) is provided so that it can be opened and closed freely,
A small-diameter third manhole (
b3) is provided so that it can be opened and closed freely.

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 (b) through the inlet (4) and #R substances (water, carbohydrates, proteins, While passing through the up-flow anaerobic hearth (5), the anaerobic bacteria that adhere to the surface of the furnace material of the hearth (5) undergo anaerobic decomposition. .

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 (CH3C00tl) and propionic acid (
CHa CH2C0OH), etc., and then
Anaerobic bacteria such as methane bacteria decompose organic acids to produce methane (C114) and carbon dioxide (CO2).
These gases are discharged to the outside of the septic tank (A), 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 upward flow anaerobic hearth (5) settle at the bottom of the first chamber (al).

By performing such anaerobic treatment, MN'lJ can be effectively removed from the treated water, and as a result, the treated water after anaerobic treatment contains ammonia nitrogen (N1
14''-N) and a small amount of unprocessed R substances are transferred from the first chamber (al) 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 upward flow anaerobic hearth (9) in the second chamber (a2). It is directly transferred to the same P bed (9) without any anaerobic treatment.

After that, while passing downward and upward through the upward flow anaerobic hearth (9), it undergoes the same anaerobic decomposition as described above again, further decomposing organic matter, and then ammonia (Ntla
The treated water containing N) and a further small amount of untreated organic matter is transferred to the next aerobic treatment chamber (O3) via the third advection pipe (16).

Therefore, in this embodiment, the anaerobic treatment in the second chamber (O2) of the anaerobic treatment chamber (C) is performed by passing the treated water through the upper flow anaerobic hearth (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 materials can be transferred to the furnace. It can be moored to the floor to further promote anaerobic decomposition.

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 residue of undecomposed organic matter 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, the treated water that has been anaerobically treated in the first chamber (al) of the anaerobic treatment chamber (C) is sent directly to the bottom of the second chamber (O2), without being sent to the top of the second chamber (O2). Undecomposed substances remain in the upper part of the upward flow anaerobic bed (9), and the second chamber (O
2) to the aerobic treatment room (O2) installed in parallel with the second room (O2).
It is possible to reliably prevent the water from flowing directly into O3).

Next, to explain the purification process in the aerobic treatment chamber (O3), inside the aerobic treatment chamber (O3), there is an aeration system!
Air is blown into the treated water from the aeration pipe (13b) in (13), and aerobic bacteria such as nitrifying bacteria utilize the oxygen in the air to oxidize and decompose the ammonia nitrogen ( NH4''-N) is nitrate nitrogen (N02-
-N) and nitrite (NO2--N).

It is also preferable to inoculate aerobic bacteria with a proven seed bacteria as described above, and the aerobic P bed (12) will allow the aerobic bacteria to adhere to it, causing the aerobic bacteria to flow out, thereby reducing the bacterial concentration. 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 chamber (O3) without being directly discharged outside the septic tank (^). A part of the treated water (O2) is transferred to the air lift pipe (14
The air from the diffuser pipe (13b) that is blown into the air lift pipe (14) from below lifts the air to the water collection basin (14a) installed above the air lift pipe (14), where the air and liquid are separated in the water collection basin (14a). , the first chamber (a) via the return pipe (14C)
I am trying to send it back to l).

Therefore, when treated water containing nitrate nitrogen (803'''-N) and nitrite nitrogen <NO2--N) flows into the first chamber (al), the amount of water present in the first chamber (al) Denitrifying bacteria utilizes the oxygen of these inorganic compounds to decompose the organic matter that flows into the first chamber (al) to obtain energy for survival.As a result, the denitrifying bacteria is reduced to organic matter and molecules Nitrogen (
N2) and nitrous oxide (N20), organic carbon is decomposed and becomes carbon dioxide (CO2), and the septic tank (A)
It will be released outside.

In this way, the decomposition treatment of organic matter in the first chamber (al) can be performed not only by anaerobic treatment but also by partially refluxed water from the aerobic treatment chamber (O3) and denitrifying bacteria acting on it.

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 is in the direction of suppressing the activity of anaerobic bacteria), Further, due to the 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, the amount of untreated organic matter contained in the treated water transferred from the anaerobic treatment chamber (C) to the aerobic treatment chamber (O3) can be significantly reduced. Aerobic treatment room due to untreated organic matter (
The generation of sludge in O3) can also be reduced as much as possible.

On the other hand, the concentration of nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2-N) in the treated water in the aerobic treatment room (O3) also decreased when some of the treated water was transferred to the anaerobic treatment room (C). Reflux and convert those ions into molecular nitrogen (N2) by denitrifying bacteria.
Since it can be decomposed into nitrous oxide (N20) and nitrous oxide (N20), 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 a very large amount of solid matter remaining in the treated water, flows into the disinfection chamber (18), and enters the chemical cylinder. (
18b) The treated water is disinfected and sterilized by the solid disinfectant that gradually flows out from 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 applicant, BODf in the final treated water obtained by the septic tank (A) according to this example
4 degrees etc. were as shown in the table below.

Note that the numerical values are expressed as average values.

As is clear from the above table, in the case of this example, the B (>T) concentration 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 (0
1) If the partial recirculation amount from the aerobic treatment chamber (a3) to the anaerobic treatment chamber (C) is (02), then the anaerobic treatment chamber (C)
A view of the treated water being transferred from the to the aerobic treatment room (a3) (Q
3) becomes Q3=01+02, but Ql : Q
It has been found that it is preferable that 2=~1:1-10 (optimally 1:2-6).

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 accumulates in the first chamber (al), the second chamber (a2), and the aerobic treatment chamber (a3).

, In the case of 2, the first and second manholes (b) of the lid body (b)
Open IHb2) and connect the first and second advection tubes (10) (11)
By making the passageway, the first chamber (al) and the second chamber (a2)
A vacuum hose can be easily inserted into the bottom of the chamber to suck up solids and sludge, and an aerobic treatment chamber (
By sucking up the solids and sludge in a3), the solids in the sedimentation separation chamber (a4) are also sucked out at the same time. Furthermore, the third manhole (b3) can be opened to easily replace the medicine cartridge (18b).

In addition, surplus sludge adheres to the aerobic P 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, a baffle plate is disposed directly below the inlet to catch the wastewater flowing in from the inlet, and the baffle plate temporarily catches the wastewater and allows it to flow down to the purification processing section. Because of this, the following effects occur.

(2) It is possible to prevent sewage from passing linearly through the purification treatment section, and the anaerobic treatment of the sewage can be reliably performed by the purification treatment section. In particular, by dispersing the solids in the inflowing wastewater using the baffle plates, good anaerobic treatment capacity can be ensured.

■It is possible to prevent air from being drawn into the sewage inside the septic tank due to the linear inflow of sewage.
It is possible to prevent the occurrence of a problem in which the amount of dissolved oxygen in the wastewater increases and the activity of anaerobic bacteria is suppressed.

■It is possible to prevent the occurrence of problems in which the scum layer formed on the sewage surface inside the septic tank body is destroyed by the sewage flowing in linearly, and the scum layer causes contact between the sewage inside the septic tank body and the air. Prevention can be ensured well, and anaerobic treatment capacity within the septic tank body can be ensured well.

■When sewage falls, it no longer directly collides with the sewage collected inside the septic tank body, so it is possible to prevent the generation of noise.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a septic tank equipped with a baffle plate 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 an enlarged perspective view of the baffle plate. FIG. 5 is a plan view of the aerobic treatment chamber. Figure 6 is a perspective view of the water collection basin. FIG. 7 is a perspective view of a water collection basin as another embodiment. (^): Septic tank (C): Anaerobic treatment chamber (at): First chamber (a2): Second chamber a3): Aerobic treatment chamber a4): Sedimentation separation chamber 1): Partition wall 10): First advection Pipe 11): Second advection pipe 18): Disinfection chamber 25) Two baffles

Claims (1)

[Claims] 1) An inlet (4) communicating with the upstream side of the sewage discharge pipe is provided on one side of the septic tank body (a), and a sewage discharge port is provided on the other side of the septic tank body (a). A discharge port (17) communicating with the downstream side of the pipeline is provided, and the septic tank body (
a) In a septic tank configured to purify the sewage flowing into the septic tank by a septic processing section provided in the septic tank body (a) and discharge it from the outlet (17) to the downstream side of the sewage discharge pipe, the inlet A baffle plate (25) is arranged directly below the inlet (4) to catch the inflowing wastewater from the inlet (4).
25) A baffle plate structure in a septic tank configured to once receive sewage and flow it down to a purification treatment section. 2) The baffle plate (25) according to claim 1 is connected to the outlet (17).
A baffle plate structure in a septic tank characterized by being inclined toward the side with a low front and a high rear.