JP2000233192A - Septic tank and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adapt a septic tank system utilizing ozone to special environment like a small-sized septic tank treatment equipment. SOLUTION: An aeration tank 3, a blower 7 and an air diffusing pipe 8 for supplying air to the aeration tank 3 and an ozone generator 10 are provided and ozone generated by the ozone generator 10 is supplied to the upper space of a septic tank 1 in a state held to a concn. of about 0.1 ppm by utilizing the air stream supplied by the blower 7 and the air diffusing pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank and a method for purifying the same, and more particularly, to a septic tank using ozone and a method for purifying the same.

2. Description of the Related Art The structure and performance of a conventional general septic tank, for example, a small septic tank that treats human waste from a general household toilet or sewage mixed with human waste and miscellaneous wastewater are regulated by law and comply with standards. Is managed. In other words, the law stipulates that a structure should be adopted in which measures necessary to prevent the generation of bad smells and the generation of sanitary pests such as mosquitoes and flies are taken. However, even in a septic tank having such a structure, actually, scum is generated due to abnormal growth of filamentous bacteria, foul odors caused by the floating sediments, generation of sanitary pests, and deterioration of the processing function, etc. There are problems in the above and processing, and the solution of these problems is strongly desired.

[0003]

2. Description of the Related Art A "bulking prevention method in aeration treatment" disclosed in Japanese Patent Application Laid-Open No. 6-39390 includes a large activated sludge treatment tank (aeration tank) such as a sewage treatment plant.
In the above, a large amount of ozone of several mg / L to several tens mg / L is injected into the liquid to be treated together with air to reduce the ozone concentration to 10%.
There is disclosed a technique in which the generation of scum is prevented by adjusting the concentration to 0 to 400 ppm.

[0004] Further, the "method of treating wastewater" disclosed in Japanese Patent Application Laid-Open No. Hei 7-155783 involves aerating air having an ozone concentration of 10 ppm to 20 ppm into an activated sludge treatment tank (aeration tank). Discloses a technique of suppressing deterioration of sludge settling property in high-concentration wastewater treatment.

[0005] As described above, the use of ozone prevents generation of scum in a large processing tank (aeration tank),
For example, it suppresses the deterioration of sludge settling in high-concentration wastewater treatment. Ozone is used not only for aeration but also for septic tanks for the purpose of deodorization. That is, a deodorization method is widely known in which a catalyst for reacting with ozone is separately disposed in a septic tank in consideration of safety and decomposition rate, and a malodorous component is once adsorbed on the catalyst and then reacted with ozone. I have.

In the invention disclosed in Japanese Patent Application Laid-Open No. Hei 10-235139, "Deodorization Method in Wastewater Treatment Facility", an exhaust pipe and an exhaust fan are provided in a wastewater treatment facility without providing a separate catalyst. There is disclosed a technique in which ozone is supplied to an upper space of a tank and directly reacts with a malodorous component and ozone to deodorize air in a septic tank.

[0007]

However, in the prior art, because of the large size of the equipment, there are many incidental equipment such as an equipment for circulating ozone in addition to an ozone generator and an ozone supply apparatus. Equipment is required, and therefore, there is a problem that it is difficult to employ a purification system using ozone as described above in a general small-sized septic tank in terms of securing a space and performing maintenance and inspection of the septic tank.

That is, the aeration tank used in the "method of preventing bulking in aeration treatment" in JP-A-6-39390 and the "method of treating wastewater" in JP-A-7-155783 is exclusively used for a sewage treatment plant. It is intended for large aeration tanks such as plants and factories, and not for general septic tanks. Therefore, application to general septic tanks was difficult in terms of price, space, and management. Also, in the use of ozone for the purpose of deodorization, it is necessary to provide a separate catalyst for deodorizing air in the septic tank. In addition, in the “deodorization method in wastewater treatment equipment” disclosed in Japanese Patent Application Laid-Open No. H10-235139, a large amount of ozone is intensively supplied to a site where a lot of bad odors are generated. It was difficult to apply it to general small septic tanks in terms of price, space, and management.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and provides a septic tank and a method for purifying the same, in which a purification system using ozone can be applied to a special environment such as a small-sized septic tank treatment facility. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided a septic tank, comprising: an aeration tank; air supply means for supplying air to the aeration tank; and ozone generation means for generating ozone. The ozone generated by the ozone generating means, utilizing the air flow of the air supplied by the air supply means, in the upper space of the septic tank,
It is characterized in that it is supplied while maintaining the concentration at about 0.1 ppm.

[0011] According to the present invention, the air is supplied to the aeration tank using the airflow of 0.1 mm in the upper space of the septic tank.
Ozone is supplied while maintaining the concentration at about 1 ppm.

According to a second aspect of the present invention, there is provided an aeration tank, air supply means for supplying air to the aeration tank, and ozone generation means for generating ozone, wherein the ozone generated by the ozone generation means is provided. , Mixed in the air supplied by the air supply means, and placed in the upper space of the septic tank.
It is characterized in that it is supplied while maintaining the concentration at about 1 ppm.

According to the present invention, the air is mixed with the air supplied to the aeration tank, and is added to the space above the septic tank by 0.1 p.
Ozone is supplied while maintaining the concentration at about pm.

According to a third aspect of the present invention, the septic tank comprises:
It is a small-sized septic tank treatment facility that is connected to a toilet and treats human waste, or that treats human waste and miscellaneous wastewater together.

According to the present invention, a purification system using ozone is applied to a small-sized septic tank treatment facility.

According to the fourth aspect of the present invention, the ozone generated by the ozone generating means is used for the upper space of the purification tank by utilizing the air flow of the air supplied by the air supply means for supplying air to the aeration tank. It is characterized in that it is supplied while maintaining the concentration at about 0.1 ppm.

According to the present invention, the air is supplied to the aeration tank and the air is supplied to the upper space of the septic tank using the air flow.
Ozone is supplied while maintaining the concentration at about 1 ppm.

According to the invention according to claim 5, ozone generated by the ozone generating means is mixed with air supplied by the air supply means for supplying air to the aeration tank, and is mixed in the upper space of the purification tank. , And 0.1 ppm.

According to the present invention, the air is mixed with the air supplied to the aeration tank, and is added to the space above the septic tank by 0.1 p.
Ozone is supplied while maintaining the concentration at about pm.

According to a sixth aspect of the present invention, the septic tank is a small-sized septic tank treatment facility that is connected to a toilet to treat human waste or to treat human waste together with gray water. .

According to the present invention, a purification system using ozone is applied to a small-sized septic tank treatment facility.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a septic tank and a purification method for the same according to the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG. 1 is an explanatory diagram for explaining the septic tank according to the first embodiment. The septic tank 1 is divided into a sedimentation separation tank 2, an aeration tank 3, a sedimentation tank 4, and a disinfection tank 5.

The sedimentation separation tank 2 separates night soil (drainage),
A part of the anaerobic treatment is performed, and the load amount of the drainage treatment in the aeration tank 3 is adjusted. The aeration tank 3 has a contact material 6 inside, and decomposes organic matter in water by the action of a microorganism film formed on the contact material 6 to purify wastewater. Since the microorganisms that form the microbial membrane are aerobic, air is blown through the blower 7 and the air diffuser 8 into the drainage layer to propagate. The sedimentation tank 4 receives the wastewater from the aeration tank 3 and stores the wastewater for a predetermined time to separate fine suspended microorganisms from the supernatant. The supernatant liquid separated in the sedimentation tank 4 flows into the disinfection tank 5, is disinfected by the disinfectant 9, and is discharged out of the purification tank 1 as purified water.

An ozone generator 10 is provided above the aeration tank 3. Ozone is generated using air taken in from an air inlet 11 as a raw material and supplied to the air layer of the aeration tank 3 through a supply pipe 12. The air blown out by the air diffuser 8 forms an air flow in the air layer of the aeration tank 3, and the supply pipe 12
Ozone supplied along the flow of the air,
Through the vents 14 and 15, they move to the air layers in the sedimentation separation tank 2, the sedimentation tank 3 and the disinfection tank 4, respectively. Ozone reacts with the malodorous components generated from each tank in the transfer process to deodorize, and further sterilizes and reduces the volume of the scum 13 that has floated and accumulated. In addition, since the air layer is filled with ozone, sanitary pests generated on the scum 13 and the like are eliminated.

The unreacted ozone surplus in the air layer diffuses and dissolves in the drainage layer of each tank, and deodorizes odorous components in the drainage.
Ozone not only deodorizes but also oxidizes and decomposes organic matter in wastewater. In particular, in the drainage layer of the aeration tank 3, the biodegradability is increased, the cohesion is increased, and the separability between the suspended microorganisms and the supernatant in the settling tank 4 is improved.

The septic tank 1 is provided with an ozone concentration detection sensor 21 and a control device 20. The ozone concentration detection sensor 21 detects the ozone concentration in the septic tank. If the concentration detected by the ozone concentration detection sensor 21 exceeds a set value, for example, the work reference value of 0.1 ppm, the control device 20 controls the ozone generator 10 to reduce the amount of ozone generated. Accordingly, it is possible to provide a highly safe septic tank 1 in which high-concentration ozone does not leak out of the septic tank 1. It should be noted that the ozone concentration detection sensor 21 does not hinder being installed at a plurality of locations in the air layer.

The ozone generator 10 and the air inlet 1
1 is an ozone generator, the ozone generator 10 and the supply pipe 12 are ozone supply means, a blower 7, an air diffuser 8,
The vents 14 and 15 correspond to the transmission means, the ozone concentration detection sensor 21 corresponds to the detection means, and the control device 20 corresponds to the control means.

FIG. 2 is a chart showing the measurement results when the septic tank 1 according to the first embodiment is applied to an actual septic tank (a septic tank that can be processed by seven persons). 72p with ozone generator 10
pm ozone is generated at a rate of 1.5 L / min.
To the air layer. The amount of ozone generated in this case is about 14
mg / h. The measurement result of the ozone concentration in the air layer was 0.02 to 0.1 ppm, which was below the working standard value.

In one day after use, the odor of the septic tank 1 disappears,
Sanitary pests such as Drosophila, which had been seen until then, have disappeared at all. Furthermore, the transparency is 12 cm at the beginning of the measurement.
However, the visibility increased 30 cm after 3 weeks.
This transparency is a transparency that is hardly achieved by the ordinary single treatment septic tank, and it was confirmed that the water quality was significantly improved as compared with the conventional septic tank. At the same time, a decrease in scum and peeling of the contact film were observed.

When the septic tank 1 was applied to an oil / water separation trap for canteen wastewater, a remarkable deodorizing effect and a repellent effect were also observed. Similarly, when the septic tank 1 was applied to the toilet of a toilet for collecting water, a remarkable deodorizing effect and an insect repellent effect were also observed.

The septic tank 1 is not limited to the above embodiment. For example, an ozone generator 10, a supply pipe 11, a control unit 2
It is also possible to make 0 and the ozone concentration detection sensor 21 independent as a purification unit. By doing this,
The versatility is improved, and it can be attached to an existing septic tank, and convenience is improved. Further, an aspect in which the purification unit is attached to the lid of the purification tank may be adopted.

The purifying tank 1 according to the first embodiment supplies ozone to the air layer of the aeration tank 3 and uses the supplied ozone to make use of the flow of air formed by the air from the diffuser 8 in the air layer. By moving it to each air layer inside, it is possible to contribute to deodorization and insect control of the septic tank with a simple configuration and ozone concentration lower than the ozone concentration conventionally used, and at the same time improve water quality Become.

Embodiment 2 FIG. 3 is an explanatory diagram illustrating a septic tank according to the second embodiment. In the second embodiment, description of the same parts as in the first embodiment will be omitted, and only different parts will be described. The septic tank 1 ′ in the second embodiment includes an ozone generator 10.
Is connected to the blower 7. Therefore, the ozone generated by the ozone generator 10 is passed through the air diffuser 8 to the aeration tank 3.
Is ejected to the drainage layer. Since ozone has high reactivity with water, part of the ozone is absorbed by the drainage layer, and unreacted ozone moves to the air layer.

The septic tank 1 'according to the second embodiment supplies ozone directly to the drainage layer of the aeration tank 3 as compared with the septic tank 1 of the first embodiment, and therefore is excellent in removing malodorous components in the drainage layer. In addition, organic substances are frequently oxidatively decomposed, thereby being excellent in biodegradability and improving cohesiveness. Therefore, the sedimentation tank 4
In this method, the separation between the suspended microorganisms and the supernatant is further improved. If the supplied ozone concentration is within 400 ppm, without killing the aerobic microorganisms in the drainage layer,
It is known to selectively kill only filamentous bacteria.

The ozone generator 10 and the air inlet 11 correspond to an ozone generator, and the ozone generator 10, the blower 7 and the air diffuser 8 correspond to an ozone supply unit.

A case will be described in which the septic tank 1 'of the second embodiment is applied to a septic tank with only seven persons. Ozone having a concentration of 5.9 ppm was generated at a rate of 40 L / min by the ozone generator 10 and supplied to the air layer of the aeration tank 3. The amount of ozone generated in this case is about 30 mg / h. So about 50%
Ozone is absorbed in the drainage layer. The ozone concentration in the air layer of the aeration tank 3 was 0.02 to 0.1 ppm, which was below the operation standard value. Although not specifically shown in the chart,
The observed results were almost the same as in Table 1.

The purifying tank 1 'is not limited to the above-described embodiment. For example, the blower 7, the ozone generator 10, the supply pipe 11, the diffuser 8, the controller 20, and the ozone concentration detecting sensor 21 can be made independent as a purifying unit. It is. By doing so, the versatility is increased, the device can be attached to an existing septic tank, and the convenience is improved. Further, an aspect in which the purification unit is attached to the purification tank lid may be adopted.

The septic tank 1 ′ according to the second embodiment directly supplies air mixed with ozone to the drainage layer of the aeration tank 3, thereby contributing to purification of the drainage layer and containing ozone reaching the air layer of the aeration tank 3. Since the air moves to each air layer in the septic tank 1 ', the ozone having a simple structure and a lower concentration than the conventionally used ozone concentration contributes to deodorization and insect control of the septic tank, and at the same time aims to improve water quality. It becomes possible.

In the septic tank of the second embodiment, ozone is supplied to the drainage layer of the aeration tank 3 in the existing septic tank, and the supplied ozone is supplied to the inside of the septic tank 1 by utilizing the flow of air formed in the air layer by the diffuser 8. By moving to the respective air layers, it is possible to contribute to deodorization and insect control of the septic tank, and at the same time, to improve water quality.

[0041]

As described above, the septic tank and the purification method according to the present invention can be used in a small-sized septic tank treatment facility for treating night soil by connecting to a toilet or by processing night soil and wastewater together. The ozone generated by the ozone generating means is maintained at a concentration of about 0.1 ppm in the upper space of the septic tank using the air flow of the air supplied by the air supplying means for supplying air to the aeration tank. For supply, a purification system using ozone can be applied to a special environment such as a small septic tank treatment facility.

A septic tank and a method of purifying the same according to the present invention are characterized in that the ozone generated by the ozone generating means is used in a small septic tank treatment facility for treating human waste by connecting to a toilet or treating human waste together with miscellaneous wastewater. Is mixed with the air supplied by the air supply means for supplying air to the aeration tank, and supplied to the upper space of the septic tank while maintaining the concentration at about 0.1 ppm. The purification system using ozone can be applied to a special environment such as that described above.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a schematic configuration of a septic tank according to a first embodiment.

FIG. 2 is a diagram illustrating a measurement result when the septic tank according to the first embodiment is applied to a septic tank treated by seven persons alone.

FIG. 3 is an explanatory diagram illustrating a schematic configuration of a septic tank according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Septic tank 2 Precipitation separation tank 3 Aeration tank 4 Sedimentation tank 5 Disinfection tank 6 Contact material 7 Blower 8 Air diffuser 9 Disinfectant 10 Ozone generator 11 Air intake 12 Supply pipe 13 Scum 14, 15 Vent 20 Control device 21 Ozone concentration detection sensor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D002 AB02 AC10 BA05 CA01 CA06 CA11 DA51 GA01 GA03 GB02 4D027 AA02 AA12 AA16

Claims (6)

[Claims] 1. An aeration tank, air supply means for supplying air to the aeration tank, and ozone generation means for generating ozone, wherein the ozone generated by the ozone generation means is supplied by the air supply means. A septic tank characterized by being supplied to an upper space of a septic tank at a concentration of about 0.1 ppm using an air flow of supplied air. 2. An aeration tank, air supply means for supplying air to the aeration tank, and ozone generation means for generating ozone, wherein ozone generated by the ozone generation means is supplied by the air supply means. A septic tank which is mixed with supplied air and supplied to an upper space of the septic tank while maintaining the concentration at about 0.1 ppm. 3. The septic tank according to claim 1, wherein the septic tank is a small-sized septic tank treatment facility for treating human waste in connection with a toilet or for treating human waste together with miscellaneous wastewater. Septic tank. 4. A concentration of about 0.1 ppm of ozone generated by the ozone generating means in an upper space of the purification tank using an air flow of air supplied by an air supply means for supplying air to the aeration tank. A method for purifying a septic tank, characterized in that it is supplied in a state maintained at a constant temperature. 5. The ozone generated by the ozone generation means is mixed with air supplied by the air supply means for supplying air to the aeration tank, and is mixed in the upper space of the purification tank.
A purification method for a septic tank, wherein the supply is performed while maintaining the concentration at about 0.1 ppm. 6. The septic tank according to claim 4, wherein the septic tank is a small-sized septic tank treatment facility for treating human waste in connection with a toilet or for treating human waste together with miscellaneous wastewater. Purification method of septic tank.