JPH081036Y2 - Sewage septic tank - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a sewage purification tank, and more particularly to an improvement of the sewage purification tank.

[Conventional technology]

Conventionally, as a domestic wastewater and sewage purification tank for gray water,
A combined septic tank having a primary treatment tank with anaerobic microorganisms and a secondary treatment tank with aerobic microorganisms is known.

In the above-mentioned small combined septic tank, in order to effectively denitrify wastewater sewage, a part of the sewage may be returned from the contact aeration tank to the anaerobic treatment tank to form a circulation path in the sewage purification tank.

[Problems of conventional technology]

By the way, since there is almost no inflow load of sewage in the combined septic tank at night, the anaerobic tank is scarce of the source of denitrifying organic carbon, and even if the sewage is circulated, sufficient denitrification is not likely to occur. .

Therefore, in order to efficiently perform denitrification, it is necessary to form a circulation route during the daytime when the inflow load of sewage is large. Also,
As a control device for that purpose, a control device that combines a timer, a water level detection sensor, a power source, etc. is required, which complicates the device and also causes troublesome maintenance and inspection.

[Problems to be solved by the device]

In view of the above problems, the present invention limits the formation of a sewage circulation path for efficient denitrification exclusively to the daytime without using a complicated control device such as a timer or a power supply, and the operation at that time is also very economical. The purpose of the present invention is to provide a sewage purification tank that can be used in various ways.

[Technology for solving problems]

That is, the sewage purification tank of the present invention is provided with a sewage return pipe from the contact aeration treatment tank of the combined sewage treatment tank including an anaerobic treatment tank, a contact aeration treatment tank, a precipitation tank and a disinfection tank to the anaerobic treatment tank. The air supply blower of the pipe air lift pump is provided separately from the diffuser pipe blower that diffuses air to the contact aeration processing tank, and the air supply blower of the air lift pump is directly driven by the solar cell as a power source without using a storage battery. It is characterized by being configured as described above.

〔Example〕

 Next, an embodiment of the present invention will be described.

 FIG. 1 is a sectional view of an embodiment of the present invention.

The sewage purification tank 1 of the present invention is provided with an anaerobic treatment tank 2, a contact aeration treatment tank 3, a settling tank 4 and a disinfection tank 5, and in the combined purification tank 1 in which sewage W is sequentially adsorbed and purified, contact aeration is performed. A sewage return pipe 3A is provided from the treatment tank 3 to the anaerobic treatment tank 2, and an air supply blower 7 of an air lift pump 6 of the sewage return pipe is in contact with the blower 8 for a diffuser pipe which diffuses air into the aeration treatment tank 3. The air supply blower 7 of the air lift pump is configured so as to be directly driven by using the solar cell 9 as a power source without using a storage battery.

[Action]

In the sewage purification tank 1 of the present invention, the sewage W is purified while advancing through the respective treatment tanks as described above, but a part of the sewage in the contact aeration tank 3 is passed through the sewage return pipe 3A by the air lift pump 6. And returned to the anaerobic treatment tank 2.

At this time, the drive power source of the air lift pump 6 is the solar cell 9 directly without passing through the storage battery, so it is not driven unless it is bright in the daytime. Therefore, the circulation route is selectively provided only during the daytime without providing a control device. Can be formed. Moreover, since the amount of water returned by the air lift pump 6 draws a curve proportional to the sun's altitude, the water is returned only during the day following this curve. Further, since the amount of circulating water is allowed to fluctuate somewhat, fluctuations in the blower capacity due to the intensity of sunlight are not a big problem.

〔effect〕

As explained above, the wastewater septic tank of the present invention automatically circulates the wastewater only during the daytime when there are many organic carbon sources necessary for denitrification, and its drive power source uses a solar cell as a direct power source. In addition, it does not require a commercial power source and does not require a control device such as a timer for operating only in the daytime, and the sewage can be selectively returned, so that a very economical operation can be performed. In addition, the amount of water returned by the air lift pump 6 draws a curve proportional to the sun's altitude and is returned only during the day according to this curve, and the return is stopped at the peak of the dirty water supply in the early morning and at night, so at the peak of early morning and night. It has the advantage of being able to efficiently return the nitrification solution during the day after the SS is prevented from advancing to the next tank and the nitrification reaction progresses against the sewage supply load on the night before and in the morning. In this case, the probability of washing is high, and the amount of returned water increases in proportion to the sun's altitude after the inflow of laundry drainage, so that the treated water can be efficiently returned after the nitrification reaction has sufficiently progressed, and it is also suitable for promoting the denitrification reaction. Have.

On the other hand, in rainy weather, the amount of water to be returned decreases, but at the same time, there is no problem because the load due to washing and the like is small at the same time.

The airlift pump for returning sewage may have a small capacity, so that the capacity of the solar cell as a power source is small and economical. Also, if a DC motor is used, a quadrature converter is not required and the system becomes compact.

[Brief description of drawings]

 FIG. 1 is a sectional view of an embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Dai Harada, 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture 1 Kubota Shiga factory (72) Creator Kazuyuki Honda 1 of 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Kubota Shiga Plant, Ltd. (56) References JP-A 1-228593 (JP, A) Takahashi, Hamakawa, Gogawa, "Solar Power" (1980-2-20) Morikawa Publishing P. 455

Claims (1)

[Scope of utility model registration request] 1. A sewage return pipe is provided from the contact aeration treatment tank to the anaerobic treatment tank of the combined septic tank equipped with an anaerobic treatment tank, a contact aeration treatment tank, a precipitation tank and a disinfection tank, and The air supply blower of the air lift pump is provided separately from the air blower blower for diffusing to the contact aeration processing tank, and the air supply blower of the air lift pump is directly driven by the solar cell as a power source without using the storage battery. A sewage purification tank characterized by being configured as described above.