JP2723248B2 - Sewage treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sewage treatment apparatus, and more particularly to a sewage treatment apparatus capable of adjusting the amount of sewage treatment.

[Conventional technology]

Conventionally, the inside of one tank is divided into several parts by a human waste purification tank or a gray water purification tank, and each tank is used as an anaerobic microorganism treatment tank, or a sedimentation separation tank, an aerobic microorganism treatment tank, a suspended matter sedimentation tank, and a disinfection tank. A sewage treatment apparatus having a structure in which sewage is advected and purified in this order is widely known.

[Problems of the prior art]

By the way, the amount of sewage supplied to these sewage treatment equipment is not constant throughout the day, but is generally concentrated during a certain time period.If the allowable load water capacity of the sewage treatment equipment is exceeded, the sewage is discharged without treatment. And may cause problems.

In order to solve such a problem, the overflow weir to the disinfection tank is raised, and the treated water in the settling tank is forcibly transferred to the disinfection tank by an air lift pump. To lower the water level to the lowest level (for example, Japanese Utility Model Application No. 62-122,1982), or to constantly return the wastewater from the sedimentation chamber to a lower processing chamber using an air lift pump to ensure the processing (for example, Japanese Utility Model Application No. 62-115470). However, in the former case, the air power supplied to the air lift after the water level becomes low is wasted, and in the latter case, the circulation amount at the low water level is small due to the characteristics of the air lift pump. On the other hand, when the water level is high, the circulation amount tends to be large, and there is a problem that the flow rate cannot be sufficiently adjusted at the high water level where the circulation amount is desired to be reduced.

[Problems to be solved by the invention]

In view of the above problems, an object of the present invention is to provide a sewage treatment apparatus capable of automatically selecting a sewage circulation or advancing to the next chamber according to a stored water level in the sewage treatment apparatus and performing sewage treatment with high purification efficiency. It is a thing.

[Technology that solved the problem]

That is, in the sewage treatment apparatus of the present invention, a treated water conduit is erected at a position higher than the highest sewage storage water level over both the lower treatment chamber to which untreated sewage is supplied and the disinfection tank into which treated water flows. A conduit for supplying treated water from the sedimentation chamber by an air lift is connected to the water conduit, and one end of the treated water conduit is connected to the disinfection tank at the highest water level of the sewage storage water, and at the other end to the lowest water level. A check valve device for introducing treated water into the primary treatment chamber is provided.

〔Example〕

 Next, the present invention will be described with reference to examples.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view of a main part of FIG.

The sewage treatment apparatus 1 of the present invention comprises an aerobic treatment chamber 1C, a sedimentation tank 1D, and a disinfection tank 1E in order from primary treatment chambers such as an anaerobic filter bed first chamber 1A and an anaerobic filter bed second chamber 1B to which sewage is supplied. In a sewage treatment apparatus that purifies wastewater while transferring the wastewater to the wastewater treatment apparatus, a treated water conduit 2 is installed between a primary treatment room such as 1A or 1B and a disinfection tank 1E, and the treated water conduit 2 is provided with an air lift 2A from a settling tank 1D. A conduit 3 for supplying treated water is connected to the treated water conduit 2. The treated water conduit 2 is connected to the disinfection tank (1E) at the highest water level of the sewage stored water at one of the ends 2B and 2C, and to the LWL at the opposite lowest water level. Is provided with a check valve 4 for introducing treated water into the primary treatment chambers (1A, 1B).

In the above embodiment, FIG. 1 shows a check valve 4 on the primary processing chamber side.
FIG. 2 shows a case where a check valve 4 is provided on the settling tank side.
In addition, in the embodiment of FIG.
The floating body 4A for operating the check valve 4 is disposed on the water surface (LWL) on the settling tank 1D side as shown in FIG. 3, and the valve opening / closing 4B is operated by the water level of the settling tank 1D. .

The check valve 4 on the primary processing chamber side may be a ball tap valve 4B as shown in FIG. 4 in addition to the cis-turn tank type as shown in the figure. In short, any type of structure can be used as long as it is a valve device that automatically opens and closes according to the water level in each processing chamber.

[Action]

In this invention, treated water is always supplied to the treated water conduit 2 from the settling tank 1D by the air lift 2A.

At this time, if the stored water level in the sewage treatment equipment falls,
In the case of FIG. 1, the check valve 4 is opened, the treated water is circulated again to the primary treatment chamber, and complete sewage treatment such as nitrification and denitrification treatment is performed. When the stored water level rises, the check valve 4 closes, and the treated water flows into the disinfection tank, and the stored water level is reduced.

In the case of FIG. 2, when the water level in the sedimentation tank 1D rises, the check valve 4 is opened.
And the water level in the sewage treatment apparatus 1 is reduced by the discharge of treated water. In other cases, the sewage is circulated.

〔effect〕

According to the present invention, as described above, the circulating or discharging of the treated water is automatically selected in accordance with the height of the stored water level in the sewage treatment apparatus. , Complete processing can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of another embodiment, FIG. 3 is a cross-sectional view of a main part of FIG. 2, and FIG. FIG.

Claims (1)

(57) [Claims] 1. A treated water conduit is provided at a position higher than a maximum water level of a sewage storage water over both a primary treatment chamber to which untreated sewage is supplied and a disinfection tank into which treated water flows. A conduit for supplying treated water from the sedimentation tank by an air lift is connected to one end of the treated water conduit to the disinfecting tank at the highest water level of the sewage storage water, and to the primary treatment chamber at the lowest water level. A sewage treatment apparatus comprising a check valve device for introducing treated water into the sewage treatment apparatus.