JP2003266091A - Cleaning apparatus for wastewater containing oil and fat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maximally develop a microbial decomposition capacity to decompose liquid and solid oils and fats, another organic matter, or the like, over a wide temperature range and to keep an excellent cleaning treatment capacity over a long period of time, in a wastewater cleaning apparatus utilizing microorganisms capable of decomposing oils and fats. <P>SOLUTION: The wastewater cleaning apparatus comprises a septic tank for taking in wastewater containing oils and fats and a stirring device arranged in the septic tank. Aerobic microorganisms capable of decomposing oils and fats are housed in the septic tank and the stirring device is equipped with a suction pipe for sucking wastewater in the septic tank, a discharge pipe for discharging wastewater sucked from the suction pipe and a pump for transferring wastewater from the suction pipe to the discharge pipe. The suction pipe is opened to the region slightly under the water level of the wastewater in the septic tank and the discharge pipe is opened above the water level of the wastewater in the septic tank. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification device for wastewater containing fats and oils, and more particularly to a purification device for degrading oils and fats by utilizing microorganisms, which is capable of maximizing the decomposition ability of microorganisms. The present invention relates to a purification device for wastewater containing oil and fat, which can obtain a high purification treatment capacity.

[0002]

2. Description of the Related Art Wastewater discharged from food factories, restaurants, households, etc. often contains a large amount of animal and vegetable oils and fats. Usually, oils and fats contained in such waste water are separated and removed by a natural levitation device or a pressure levitation device. However, with such a physical or chemical separation and removal method, the fats and oils in the wastewater cannot be completely removed, and the wastewater containing the fats and oils is supplied to the decomposition tank and the activated sludge method, etc. The current situation is that it is decomposed by a biological treatment method such as a biofilm such as the floating organism method and rotating organism contact method.

As a biological treatment method for wastewater containing fats and oils, for example, in Japanese Patent Laid-Open No. 8-197986, a specific strain belonging to the genus Pseudomonas is used to decompose animal and vegetable fats and oils contained in the wastewater. A method of processing is disclosed. Further, Japanese Patent Application Laid-Open No. 9-85283 discloses a method of treating wastewater with a bacterium belonging to the genus Burkholderia and capable of decomposing animal and vegetable fats and oils at high temperatures. Further, Japanese Patent Application Laid-Open No. 11-47798 discloses a method of decomposing animal and vegetable oils and fats contained in wastewater using a specific strain belonging to the genus Pseudomonas.

However, the conventional wastewater treatment methods described above have the following problems. The fat-and-oil-degrading bacteria used in the conventional method for treating wastewater decompose fats and oils in a specific temperature range, for example, in the case of the bacteria disclosed in JP-A-9-85283, a temperature range of about 40 ° C. or higher. be able to. However, it is known that the temperature in the decomposition tank in which biological decomposition is performed varies greatly depending on weather conditions, seasons, installation locations, and the like. For this reason, it has been difficult for conventional fat-and-oil-degrading bacteria to always exhibit high resolution in a decomposition tank in which a drastic temperature change occurs. As a result, the quality of the treated water that has been treated and discharged in the decomposition tank is not always constant, and the fats and oils may be discharged without being completely decomposed. Further, the oil-and-fat-degrading bacteria used in the above wastewater treatment method can decompose liquid oil and fat, but it is difficult to similarly decompose solid oil and fat. When a large amount of solid fats and oils are contained in the waste water, the quality of the treated water may be deteriorated, and anaerobic bacteria may be generated to cause a bad odor.

As a result of earnest research in view of the above-mentioned problems, the present applicant has found that Burkholderia cepacia (Burkholder)
It has been found that a strain belonging to ia cepacia) has a high decomposing ability for liquid and solid fats and oils over a wide temperature range, and Japanese Patent Application No. 2000-327169 proposes to use this strain for wastewater treatment. However, conventional decomposition tanks often do not have a structure for sufficiently exhibiting the oil / fat decomposition treatment ability of bacteria,
Even if the above-mentioned bacteria found by the applicant were added, the ability to decompose fats and oils was not sufficiently exerted, and it was difficult to maintain an excellent purification ability for a long period of time.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to maximize the decomposing ability of microorganisms in a wastewater purification apparatus that utilizes microorganisms capable of decomposing oils and fats. A device for purifying wastewater containing fats and oils that is capable of decomposing liquid and solid fats and oils and other organic substances over a wide temperature range and that can maintain excellent purification treatment performance for a long period of time. It is intended to be provided.

[0007]

The invention according to claim 1 is
A septic tank for taking in and purifying wastewater containing oil and fat, and an agitation device arranged inside the septic tank,
Aerobic microorganisms capable of decomposing fats and oils are contained in the septic tank, and the stirring device includes a suction pipe for sucking wastewater in the septic tank, a discharge pipe for discharging wastewater sucked from the suction pipe, and the suction pipe. A pump for transferring wastewater from the pipe to the discharge pipe is provided, the suction pipe is opened slightly below the water level of the wastewater in the septic tank, and the discharge pipe is higher than the water level of the wastewater in the septic tank. The present invention relates to a device for purifying wastewater containing oil and fat, which is opened at the top. The invention according to claim 2 relates to an apparatus for purifying wastewater containing oil and fat according to claim 1, wherein the microorganism is Burkholderia cepacia AIK strain (FERM BP-7308).

The invention according to claim 3 is characterized in that the discharge pipe has a second opening which opens toward the bottom of the septic tank, and drainage containing oil and fat according to claim 1 or 2. Purification device. The invention according to claim 4 is characterized in that a cover for responding to water level fluctuations, which is formed of a cylindrical body with a partially cut-out upper end portion, is detachably attached to the suction port of the suction pipe. The present invention relates to a purification device for wastewater containing the oil or fat according to any one of 3 above. In the invention according to claim 5, the septic tank is provided with an outlet for taking out the purified liquid to the outside, and the septic tank is provided with an outlet for taking out the purified liquid to the outside. An outflow pipe that guides the wastewater in the septic tank to the outlet is connected to the outlet,
The opening of the outflow pipe is arranged inside a box or cylinder arranged so that the wastewater in the septic tank can be taken in from below, and the flow of the wastewater taken in the box or cylinder. 5. An apparatus for purifying wastewater containing oil and fat according to any one of claims 1 to 4, further comprising a baffle plate for restricting the oil and fat to prevent the oil and fat from flowing into the opening of the outflow pipe. Regarding

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a device for purifying wastewater containing oil and fat according to the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing a first embodiment of a purifying device according to the present invention, and FIG. 2 is a sectional side view thereof. The purification device according to the present invention includes a septic tank (1) for taking in and purifying wastewater containing oil and fat, and a stirring device (2) disposed inside the septic tank (1) for stirring the taken-in wastewater. Composed of and.

Inside the septic tank (1), microorganisms capable of decomposing the fats and oils contained in the waste water are stored. Examples of such microorganisms include Burkholderia cepacia AIK strain (FERM BP-
7308) is preferably used. The Burkholderia cepacia AIK strain is a bacterium obtained as a result of screening by sampling the soil of Ishigaki Island, Okinawa Prefecture, and has an excellent ability to decompose fats and oils in a wide temperature range, and fatty acid, It is an aerobic bacterium that also has the ability to decompose organic substances such as proteins, carbohydrates, and sugars.

[0011] This Burkhodelia Sepacia (Burkho
The lderia cepacia) AIK strain was deposited on September 25, 2000 with the microorganism deposit number FERM BP-7308 at the Institute of Biotechnology, Institute of Biotechnology, Ministry of International Trade and Industry. In addition, this Burkholderia cepacia
Regarding the isolation method and mycological properties of AIK strain,
The description is omitted because it is as described in No. 000-327169.

FIG. 3 is an external perspective view of the stirring device (2). The stirring device (2) includes a suction pipe (3) for sucking the waste water in the septic tank (1), a discharge pipe (4) for discharging the waste water sucked from the suction pipe (3), and a suction pipe (3). A pump (5) for transferring wastewater from the drainage pipe to the discharge pipe (4). The pump (5) has legs (7) attached,
The stirring device (2) can be kept at a predetermined position in the septic tank (1).

One end of the suction pipe (3) is connected to the suction port of the pump (5), and the other end is provided with an opening extending upward to serve as a suction port. The height of this opening is set to be slightly lower than the water level of the wastewater in the septic tank (1), so that the oil and fat floating on the surface of the wastewater can be efficiently sucked.

The discharge pipe (4), one end of which is connected to the discharge port of the pump (5), has a septic tank (1) in the middle thereof.
Upper pipe (41) extending forward and upward of the same, and lower pipe (42) extending rearward and downward of the septic tank (1)
It has been branched to. In the present specification, the wastewater intake side of the septic tank (1) before the purification treatment (the installation side of the net basket (6) described later) is the front, and the drainage side of the wastewater after the purification treatment (the outlet (8) described later). ) Side) is referred to as the rear side, and the left and right sides are represented by the direction when the rear side is viewed from the front side.

The upper pipe (41) is branched into three so as to have an E shape in a top view, and each is opened above the water level of the waste water in the septic tank (1). As a result, when the wastewater inhaled from the suction pipe (3) is discharged from the upper pipe (41), the wastewater comes into contact with the air and the air is taken into the wastewater, so that the aerobic fungus Burkholderia cepacia (Burkholderia) is introduced. cepacia) AIK strain can be activated.

A net basket (6) is installed below the opening of the central pipe of the three branched upper pipes (41). Wastewater discharged from food factories, restaurants, households, etc. to be purified in the septic tank (1) is supplied into the net basket (6), and foreign substances contained in the wastewater are stored in the net basket ( 6) is captured. A supply port (30) for supplying wastewater into the tank is provided at a position above the net basket (6) on the front wall of the septic tank (1).

The lower pipe (42) is branched into two in the middle, and these two lower pipes (42) are opened toward the bottom in the vicinity of the bottom so that they are aligned on the center line of the septic tank (1) in the left-right direction. (Second opening). As a result, the wastewater sucked from the suction pipe (3) is discharged toward the bottom of the septic tank (1), and the undecomposed matter settling at the bottom blows up, and the wastewater in the tank is efficiently stirred and purified. can do.

The septic tank (1) is provided with an outlet (8) for taking out the liquid purified by the decomposition of fats and oils by microorganisms to the outside, and the outlet (8) collects the drainage in the septic tank. An outlet pipe (9) leading to the outlet is connected. The outflow pipe (9) is formed by a T-shaped pipe, the pipe (vertical pipe) corresponding to the T-shaped vertical rod is connected to the outlet (8), and the pipe corresponding to the horizontal rod (horizontal pipe) is arranged to be oriented vertically. Has been done. And, of the horizontal pipes oriented in the vertical direction, the end of the upward pipe is closed by the lid (10), and the end of the downward pipe opens downward near the bottom of the septic tank (1). There is.

A box body (11) having openings above and below is disposed below the outlet (8) in the septic tank (1). FIG. 4 is an external view of the box (11), and FIG. 5 is a vertical cross-sectional view of the box (11) seen from the front plate side, that is, the front side of the septic tank (1). As shown in FIGS. 1 and 4, the box body (11) has a U-shape in a top view composed of a front plate and left and right side plates, and the open surface of the U-shape is in close contact with the inner wall of the septic tank (1). It is fixed. Further, the box (11) has an open upper surface to form an upper opening (12), and the right side plate is opened at the lowermost part thereof to form a lower opening (13). The bottom plate (18) of the box (11) is inclined downward to the right, and legs (19) are provided in front of and behind the bottom plate (18).

A baffle plate (14) is provided in the box (11) from a position above the lower opening (13) toward the left side plate. The baffle plate (14) extends from the right side plate of the box body (11), and there is no gap between the front plate and the inner wall of the septic tank (1), and the baffle plate (14) is slightly left side plate. It is arranged so as to have a gap. Also, the baffle (1
4) is inclined in the opposite direction to the bottom plate (18), and the interval between the bottom plate (18) and the bottom opening (13) gradually narrows toward the back. In the upper position near the left end of the baffle plate (14), there is a slight gap between the baffle plate and the second baffle plate (15) substantially parallel to the left side plate of the septic tank (1). ) Is provided.

The opening of the outflow pipe (9) is opened downward in the box (11) above the baffle plate (14) and to the right of the second baffle plate (15). There is. By arranging the opening of the outflow pipe (9) inside the box (11) in this way, the box (1) is opened from the lower opening (13).
The undecomposed oil and fat contained in the wastewater that has flowed into 1) flows into the box (11) because the flow direction is restricted by the baffles (14) and (15) and flows as shown by the arrows in the figure. It is possible to prevent the oil and fat contained in the discharged waste water from directly flowing into the opening of the outflow pipe (9) and being discharged to the outside as it is. Then, since the oil and fat that has floated up without flowing into the opening of the outflow pipe (9) flows out from the upper opening (12) of the box (11), it does not collect in the box (11). It can be circulated in the septic tank to further undergo microbial degradation.

Further, since the lower opening (13) of the box (11) is opened laterally in the septic tank (1) rather than forward, it is not deposited on the bottom by drainage from the lower pipe (42). When the decomposed fats and oils are stirred, this stirred product is
1) It can be prevented from getting inside. The lower opening (13) may be provided on either the left or right side of the side plate, or may be provided on both the left and right sides.

In the present invention, the outer shape of the box (11) is not particularly limited, and can be appropriately changed according to the shape of the septic tank (1). FIG. 6 is an external view showing another example of the box (11). In this example, the box (11) has a rectangular parallelepiped shape including a front plate and a rear plate, left and right side plates and a bottom plate. The rear plate (21) is provided with a hole (20) coinciding with the outlet (8). Further, the box body (11) has an open upper surface to form an upper opening (12), and the right side plate is opened at the lowermost part thereof to form a lower opening (13). It is similar to the above-mentioned box, and the internal structure is similar to the above-mentioned box.

If the septic tank (1) is narrow, the box (11) as described above may not be installed in the tank. In such a case, instead of the box (11), As shown in FIG. 7, a structure in which the cylinder is attached to the opening of the outflow pipe (9) is adopted. As shown in FIG. 8, the tubular body comprises a connecting tubular body (22) including a large-diameter tubular portion, a small-diameter tubular portion, and a taper tubular portion connecting these, and a small-diameter portion of the connecting tubular body (22). Is larger and has a diameter smaller than the large diameter portion (2
3), the large diameter part of the connecting cylinder (22) is fitted into the opening of the outflow pipe (9), and the cylindrical body (23) is fitted into the small diameter part of the connecting cylinder (22). By
It is attached to the opening of the outflow pipe (9). At this time,
As shown in FIG. 7, a gap is formed between the tubular body (23) and the tapered surface of the connecting tubular body (22) by using a string or wire.

As shown in FIG. 9, the cylindrical body (23) has two cuts (24) and (25) formed in the cylinder in the opposite direction, and the lower part (shown by diagonal lines) of these cuts has a predetermined area. It is formed by cutting and inserting baffle plates (26) and (27) in a shape in which a part of a disk is cut out into the cut. The upper notch (24) is inclined downward, the lower notch (25) is inclined upward, and the baffle plates (26) (27) are inserted in the respective notches. As shown in the top view of 10, a slight gap is provided between the baffle plates (26, 27) and the inner surface of the cylinder.

When such a cylinder is attached to the opening of the outflow pipe (9), the lower opening (28) cut off is formed.
The drainage that flows into the cylinder from the baffle plate (26) (27)
The flow direction is restricted by, and the flow is as indicated by the arrow in FIG. At this time, most of the undecomposed oil and fat contained in the drainage flows into the outside of the tubular body through the gap between the upper opening (29) and the connecting tubular body (22), and is therefore contained in the drainage. It is possible to prevent the oil and fat from directly flowing into the opening of the outflow pipe (9) and being discharged to the outside as it is.

In the purifying device according to the present invention, the opening of the suction pipe (3) of the circulation device (2) always sucks the waste water taken into the septic tank, so that the septic tank (1) is always present.
It is necessary to be at a position lower than the water level of the wastewater in the interior, but on the other hand, in order to efficiently inhale the oil and fat in the wastewater,
The opening of the suction pipe (3) is preferably at a position slightly lower than the water level of the waste water. However, since the water level of the wastewater in the septic tank (1) changes, if the opening of the suction pipe (3) is set at a position slightly lower than the water level of the wastewater, the opening will come out of the water surface due to the drop in the water level. On the other hand, if the opening of the suction pipe (3) is located at a position considerably lower than the water level of the drainage in order to prevent this, the oil and fat suction efficiency will be greatly reduced.

Therefore, in the present invention, at the inlet of the suction pipe (3), as shown in FIG. 12, a cover (16) for responding to the water level change is formed by a cylindrical body whose upper end is partially cut away.
Is preferably detachably attached. The water level fluctuation cover (16) is attached, and as shown in FIG. 13, the septic tank (1) is placed within the height range of the wall portion (17) formed by the notch of the water level fluctuation cover (16). If the water level inside is always settled, at the time of low water level, only the supernatant liquid near the upper surface of the drainage is left as it is in the notch
It can be taken into the suction port from 8), and even when the water level becomes high, it is possible to collect the oil and fat floating on the liquid surface at the wall (17) and efficiently take it into the suction port from the notch (18). It will be possible. The water level fluctuation cover (16) can also be attached to the suction port of the suction pipe (3) of the purification device in another embodiment described later.

Further, in the present invention, the number and positions of the openings of the suction pipe (3) and the discharge pipe (4) are not limited to those shown in the figure, but the size of the septic tank (1) and the supply port (30).
It is possible to change it appropriately according to the position of the suction port (9) and, for example, the number of openings of the suction pipe (3) is two or three.
It may be one or more.

FIG. 14 is a top view showing a second embodiment of the purifying device according to the present invention, FIG. 15 is a sectional side view thereof, and FIG. 16 is an external perspective view of a circulation device in the purifying device of the second embodiment. The purification apparatus of the second embodiment is slightly different from the above-described first embodiment in the configuration of the circulation device, but the basic configuration is the same, so the same reference numerals are given to the same configurations, and the description thereof will be omitted. Only the points will be described.

Circulating device (2) of the purifying device of the second embodiment
However, the first difference from the first embodiment is that two openings of the suction pipe (3) are provided. That is, in the purification device of the second embodiment, the suction pipe (3) is branched to the left and right in the middle, and each suction pipe (3) is opened at a symmetrical position with the box body (11) and the outflow pipe (9) sandwiched therebetween. According to this configuration, it is possible to more efficiently suck the oil and fat in the waste water in the septic tank (1).

Circulating device (2) of the purifying device of the second embodiment
2 is different from that of the first embodiment in that the tip of the central pipe of the three upper pipes (41) does not reach above the net basket (6). According to this structure, the net basket (6) can be easily taken out from the septic tank (1). Incidentally, in the purification device of the first embodiment,
When removing the net basket (6) from the septic tank (1), the upper pipe (4
Since the central tube of 1) is an obstacle, it is recommended that this tube be easily attached and detached.

When the number of openings of the suction pipe (3) is three or more, the suction force by the pump (5) from each opening becomes weak and the discharge from the opening of the discharge pipe (4). The pressure also drops. Therefore, if the discharge pipe (4) has a structure as shown in FIG. 3, the discharge pressure from the upper pipe (41), which is a straight pipe, does not decrease so much, but from the lower pipe (42), which is a branch pipe. The discharge pressure of is greatly reduced. Therefore, when the number of openings of the suction pipe (3) is 3 or more, the discharge pressure of the upper pipe (41) and the lower pipe (42) is changed by changing the piping structure as shown in FIG. It is recommended that there be no significant difference between the two.

In the purifying apparatus according to the present invention,
The configuration of the circulation device (2) arranged in the septic tank (1) is
Discharge pipe (4) consisting of upper pipe (41) and lower pipe (42)
Of these, the lower pipe (42) may be eliminated and only the upper pipe (41) may be provided (that is, the second opening that opens toward the bottom in the vicinity of the bottom may not be provided). FIG. 18 is a top view of a circulation device adopting such a configuration,
19 is a side view thereof, and FIG. 20 is a front view thereof. still,
The same components as those of the circulation device according to the above-described embodiment are designated by the same reference numerals. As shown in the figure, by eliminating the lower pipe (42), the circulation device (2) can be made compact, so that it can be used particularly preferably when the septic tank (1) is small. The circulation device (2) is provided with four openings of the upper pipe (41) that is opened above the water level of the waste water in the septic tank (1) and is sucked from the suction pipe (3). Drain the front, rear, left and right 4
It is possible to discharge from a location.

The basic operation of the purifying device according to the present invention will be described below. Wastewater discharged from food factories, restaurants, general households, etc. to be purified in the septic tank (1) is a net basket (6) arranged in the septic tank (1) through the supply port (30). The foreign matter contained in the drainage supplied inside is captured by the net basket (6). The septic tank (1) contains aerobic microorganisms capable of decomposing fats and oils such as Burkholderia cepacia AIK strain, and the fats and oils contained in the wastewater supplied to the septic tank are Decomposed by the action of microorganisms.

The stirrer (2) sucks the waste water through the opening of the suction pipe (3) by driving the pump (5). At this time, since the opening is located slightly below the water level of the wastewater in the septic tank (1), the oil and fat floating on the surface of the wastewater can be efficiently sucked. The waste water sucked through the suction pipe (3) is discharged again into the septic tank (1) through the discharge pipe (4). Here, the wastewater discharged from the upper pipe (41) stirs the inside of the septic tank (1), and the air is taken into the wastewater by coming into contact with the air on the way, so that the presence in the wastewater is favorable. Gaseous microorganisms are activated. On the other hand, in the case where the lower pipe (42) is provided, the undecomposed oil and fat settled at the bottom of the septic tank (1) is floated up by the waste water discharged from the lower pipe (42) and the inside of the tank is agitated. .

The fats and oils contained in the waste water in the septic tank (1) are decomposed by the microorganisms in the tank by continuously repeating the transfer from the suction pipe (3) to the drain pipe (4) as described above. Is done and purified. The wastewater thus purified flows in through the lower opening (13) of the box (11) or the opening (28) below the cylinder, is taken into the outflow pipe (9), and is taken out from the outlet (8). ) Is taken out to the outside. At this time, since the baffle plate is provided inside the box or the tubular body, undecomposed oil and fat contained in the drainage flowing into the box or the tubular body flows to the opening of the outflow pipe (9). It is prevented from directly flowing in and being discharged to the outside.

[0038]

EXAMPLES The effects of the present invention will be further clarified by showing examples using the purification apparatus for waste water containing oil and fat according to the present invention. (Example) By using the septic tank and the stirring device of the purifying apparatus of the first embodiment, a Burkholderia cepacia AIK strain (FERM BP-7308) was placed in the septic tank.
At the same time, wastewater consisting of the remaining ramen juice discharged from the Chinese restaurant was added for purification treatment. After one day, the concentration of fats and oils contained in the waste water was measured according to JIS K0102, and it was tens of thousands of ppm before the treatment, but decreased to 130 ppm after the treatment.

[0039]

As described above, according to the invention of claim 1, the drainage containing the oil and fat taken in the septic tank can be efficiently sucked to stir the inside of the septic tank. Since air can be taken in to activate the microorganisms in the tank, it is possible to efficiently decompose and clean the oils and fats contained in the wastewater over a long period of time. According to the invention of claim 2, it becomes possible to decompose liquid and solid fats and oils and other organic substances over a wide temperature range. According to the invention of claim 3, the undecomposed matter settled at the bottom of the septic tank can be floated and stirred, so that the oil and fat contained in the waste water can be efficiently and surely decomposed. According to the invention of claim 4, even if the water level of the wastewater taken into the septic tank fluctuates, a high purification treatment capacity can always be maintained without being affected. According to the invention of claim 5, it is possible to prevent undecomposed oil and fat contained in the wastewater from directly flowing into the opening of the outflow pipe, and reliably decompose the oil and fat contained in the wastewater in the tank. It becomes possible to process.

[Brief description of drawings]

FIG. 1 is a top view showing a first embodiment of a purifying device according to the present invention.

FIG. 2 is a sectional side view showing a first embodiment of a purifying device according to the present invention.

FIG. 3 is an external perspective view of a stirring device in the purification device of the first embodiment.

FIG. 4 is an external view showing an example of a box.

FIG. 5 is a vertical cross-sectional view of the box seen from the front side of the septic tank.

FIG. 6 is an external view showing another example of the box.

FIG. 7 is a side view showing a state in which a cylinder is attached to the opening of the outflow pipe.

FIG. 8 is an exploded view of a cylinder.

FIG. 9 is a diagram showing a method of forming a cylinder body.

FIG. 10 is a top view of the cylindrical body.

FIG. 11 is a view showing the action of the cylinder.

FIG. 12 is an external view of a water level fluctuation coping cover attached to the suction port of the suction pipe.

FIG. 13 is a diagram showing the action of the water level fluctuation coping cover.

FIG. 14 is a top view showing a second embodiment of the purifying device according to the present invention.

FIG. 15 is a sectional side view showing a second embodiment of the purifying device according to the present invention.

FIG. 16 is an external perspective view of a circulation device in the purification device of the second embodiment.

FIG. 17 is a diagram showing a piping structure when the number of openings of the suction port is three or more.

FIG. 18 is a top view showing another example of the circulation device used in the purification device according to the present invention.

FIG. 19 is a side view showing another example of the circulation device used in the purification device according to the present invention.

FIG. 20 is a front view showing another example of the circulation device used in the purification device according to the present invention.

[Explanation of symbols]

1 septic tank 2 stirrer 3 Inhalation tube 4 discharge pipe 5 pumps 8 Exit 9 Outflow pipe 14 baffle 15 Second baffle 16 Water level change cover 26 baffle 27 Baffles

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sada Sasaki             25-5 Doyamacho, Kadoma City, Osaka Prefecture Asahi Sangyo Co., Ltd.             In the company (72) Inventor Shinichi Yamamoto             25-5 Doyamacho, Kadoma City, Osaka Prefecture Asahi Sangyo Co., Ltd.             In the company (72) Inventor Shigeru Kawakita             25-5 Doyamacho, Kadoma City, Osaka Prefecture Asahi Sangyo Co., Ltd.             In the company (72) Inventor Yoshinori Sadakata             25-5 Doyamacho, Kadoma City, Osaka Prefecture Asahi Sangyo Co., Ltd.             In the company (72) Inventor Yakushi Hideo             2-4-5 Kanda, Ikeda-shi, Osaka Senshin             Industrial Co., Ltd. (72) Inventor Toru Obata             2-4-5 Kanda, Ikeda-shi, Osaka Senshin             Industrial Co., Ltd. (72) Inventor Nobuyuki Hara             2-4-5 Kanda, Ikeda-shi, Osaka Senshin             Industrial Co., Ltd. (72) Inventor Hiroyasu Kawaguchi             2-13-19 Nagakorokutan, Hirano-ku, Osaka F term (reference) 4B029 AA02 BB01 CC01 DA03 DC05                       DF05 DF09 DG06                 4D028 AB01 AB03 BC11 BC22 BC26                 4D040 DD01 DD24

Claims (5)

[Claims] 1. A septic tank for taking in and purifying wastewater containing oil and fat, and an agitator arranged inside the septic tank, wherein aerobic microorganisms capable of decomposing oil and fat are contained in the septic tank. The stirrer that is housed is provided with a suction pipe for sucking the wastewater in the septic tank, a discharge pipe for discharging the wastewater sucked from the suction pipe, and a pump for transferring the wastewater from the suction pipe to the discharge pipe. The suction pipe is opened slightly below the water level of the wastewater in the septic tank, and the discharge pipe is opened above the water level of the wastewater in the septic tank. Wastewater purification device. 2. The microorganism is Burkholderia cepacia AIK strain (FERM BP-730).
(8) The purification device for wastewater containing oil and fat according to claim 1. 3. The apparatus for purifying wastewater containing oil and fat according to claim 1 or 2, wherein the discharge pipe has a second opening opening toward the bottom of the septic tank. 4. The water level fluctuation cover made of a cylindrical body with a partially cut-out upper end is detachably attached to the suction port of the suction pipe.
A purification device for wastewater containing the oil or fat according to any one of the above. 5. The septic tank is provided with an outlet for taking out the purified liquid to the outside, and the outlet is connected to an outflow pipe for guiding the wastewater in the septic tank to the outlet. The opening of is disposed inside a box or cylinder arranged so that the wastewater in the septic tank can be taken in from below, and regulates the flow of the drained water inside the box or cylinder. A device for purifying wastewater containing oil and fat according to any one of claims 1 to 4, further comprising a baffle plate for preventing the oil and fat from flowing into the opening of the outflow pipe.