JP2002113476A - Method for treating sewage in building pit and air supply device used in this method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating sewage in a building pit, capable of preventing the generation of scum by using a microbial preparation, and to provide an air supply device used in this method. SOLUTION: A microbial preparation 7 is regularly dosed to sewage 4 in a building pit, and at the same time, air is supplied continuously by an air supply device 5 to activate microorganisms. The air supply device comprises an air pump 11, a flexible pressure hose 12, an air introduction pipe 13, and an air discharge pipe 14. The air discharge pipe is formed in a rectangular shape having such a size that the pipe can be inserted into the building pit from a manhole 9 while forming air discharge holes only on the side faces of the four corners, or is formed in a round shape having such a size that the pipe can be inserted into the building pit from a manhole while forming the air discharge holes on the side faces of four places arranged at almost regular intervals in the circumferential direction. A connection pipe having an outer diameter smaller than that of an air introduction pipe body is welded to the air introduction pipe, and is connected to the pressure hose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sewage in a building pit and an air supply device used for the method.

[0002]

2. Description of the Related Art In general, a building pit is provided in a basement of a building as a sewage storage tank. In this building pit, sewage discharged from a kitchen provided in the building (miscellaneous wastewater having various components such as oil used for cooking) and sewage discharged from a toilet provided in the building (having manure) (Toilet drainage) and so on. And
Each time the level of the sewage stored in the building pit reaches a predetermined level, the level of the sewage is detected by a water level detector provided in the building pit, and based on a water level detection signal of the water level detector, drainage provided in the building pit is detected. By starting the pump, wastewater in the building pit is discharged to sewage facilities.

However, a large amount of scum is generated particularly in a building pit into which miscellaneous wastewater from a kitchen and toilet wastewater flow. In other words, in such a building pit, sludge easily precipitates and accumulates in the sewage in the building pit, and when the sludge accumulates, hydrogen sulfide is generated, which also causes a bad smell. It rises to the surface of sewage. What emerges is called scum.

When the scum accumulates, pests such as mosquitoes, flies, and flies are generated, and it becomes difficult to discharge wastewater by a discharge pump, and further, it causes an error signal of a water level detector. For this reason, it is necessary to perform the scum removal operation several times a month, for example. Specifically, the scum is sucked by a vacuum car and discarded. Alternatively, if the scum has solidified so that it cannot be sucked by a vacuum car, it is broken down and loaded on a truck for disposal. In addition, the generation of scum may be prevented by stirring the wastewater in the building pit with a large aerator (stirrer) installed in the building pit so that sludge does not settle.

[0005]

However, the operation of removing the scum requires much labor and cost. In addition, since a large amount of scum is discarded, it is also difficult to secure a disposal place. For this reason, it is desired to prevent the occurrence of scum. Further, a method of stirring sewage with a large aerator to prevent the generation of scum requires a large amount of equipment cost.

Accordingly, the inventor of the present application has considered that biodegradation of sludge in sewage in a building pit by microorganisms is considered.
That is, an attempt was made to prevent the generation of scum by administering a microorganism preparation into the wastewater in the building pit and decomposing the sludge in the wastewater in the building pit with the microorganisms of the microorganism preparation. However, scum could not be prevented by simply administering the microorganism preparation into the wastewater in the building pit. The results were the same when the types of microbial preparations were changed.

Accordingly, the present invention has been made in view of the above problems, and provides a method for treating sewage in a building pit, which can prevent the occurrence of scum using a microorganism preparation, and an air supply device used therefor. That is the task.

[0008]

Means for Solving the Problems A first method for solving the above problems is described below.
The wastewater treatment method of a building pit according to the present invention is to periodically administer a microorganism preparation into the wastewater in the building pit to biodegrade sludge in the wastewater stored in the building pit, and to introduce air into the wastewater in the building pit. It is characterized in that air is continuously supplied by a supply device to activate microorganisms of the microorganism preparation in the wastewater.

Further, the air supply device according to the second aspect of the present invention is characterized in that, in the treatment of sewage in a building pit, microorganisms of a microbial preparation that is periodically administered to the sewage of the building pit to biodegrade sludge in the sewage in the building pit. In order to activate
An air supply device that continuously supplies air into the wastewater of the building pit, and an air pump installed outside the building pit, one end of which is connected to the air pump,
The other end comprises a flexible hose inserted into a hole formed in the manhole cover of the building pit and extending into the building pit, and a metal pipe having corrosion resistance. Is connected to the other end of the hose, and the other end comprises an air introduction pipe extending downward to near the bottom surface of the building pit, and a metal pipe having corrosion resistance. And an air blowing pipe arranged on the bottom surface in the building pit to blow air into the sewage in the building pit from a plurality of air blowing holes.

The air supply device according to a third aspect of the present invention is the air supply device according to the second aspect of the invention, wherein the air blowing pipe is formed in a rectangular shape large enough to be inserted from the manhole of the building pit into the building pit. It is characterized in that air blowing holes are formed only on the side surfaces of the four corners.

The air supply device according to a fourth invention is the air supply device according to the second invention, wherein the air blowing pipe is formed in a circular shape large enough to be inserted into the building pit from a manhole of the building pit. The air outlet holes are formed only on four side surfaces at substantially equal intervals in the circumferential direction.

The air supply device according to a fifth aspect of the present invention includes
In the air supply device according to the third or fourth invention, a connection pipe having a smaller outer diameter than the air introduction pipe body is welded to one end of the air introduction pipe, and the other end of the hose is connected to the connection pipe. It is configured to be connected.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a method for treating wastewater in a building pit according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing the air supply device shown in FIG. 1 extracted, and FIG. E
FIG. 4A is an enlarged plan view of an air blowing pipe (rectangular shape) provided in the air supply device, and FIG.
4B is a view as viewed in the direction of arrow A in FIG. 4A, and FIG.
4 (a) is a view in the direction of arrow B, FIG. 4 (d) is a view in the direction of arrow C in FIG. 4 (a), and FIG. 4 (e) is a view in the direction of arrow D in FIG. 4 (a).

FIG. 5 is a plan view showing another configuration (circular shape) of the air blowing pipe, and FIGS. 6A and 6B are cross-sectional views and a plan view showing a state where a manhole cover of a building pit is removed. FIGS. 7A and 7B are a plan view and a side view showing another configuration (uniform air outlet) of the air introduction pipe.

As shown in FIG. 1, in a building pit 1 provided as a sewage tank under the building, sewage discharged from a kitchen provided in the building (miscellaneous material having miscellaneous components such as oil used for cooking). Wastewater 2 and sewage (toilet wastewater having manure) 3 discharged from a toilet provided in the building are to flow in. The building pit 1 temporarily stores sewage, and whenever the level of the sewage (drainage and toilet drainage) 4 stored in the building pit 1 reaches a predetermined level (for example, about 1 m), the level of the sewage is increased. 1 is detected by a water level detector (not shown) provided in the pit 1, and a drainage pump (not shown) provided in the building pit 1 is activated based on a water level detection signal of the water level detector, thereby obtaining waste water 4 in the building pit 1. Is discharged to sewage facilities.

The illustrated building pit 1 has a substantially cubic shape, and a bottom surface 1a in the building pit 1 has a square shape with one side of about 3 m. The upper part of the building pit 1 is closed by a concrete floor 8, and a manhole 9 as an entrance into the building pit 1 is formed in a part of the concrete floor 8. The manhole 9 is usually a manhole cover 10
Is closed by.

In the building pit 1, the following sewage treatment method is performed in order to prevent the generation of scum. That is, in order to biodegrade the sludge in the sewage 4 stored in the building pit 1, the microorganism preparation 7 is periodically administered to the sewage 4 in the building pit 1, and an air supply device is supplied to the sewage 4 in the building pit 1. 5 continuously supplies air 6 to activate the microorganisms of the microbial preparation in the sewage 4.
The details of the air supply device 5 will be described later.

When administering the microbial preparation 7, first, 10 liters of lukewarm water (30 ° C.) is put into a container such as a bucket, and the microbial preparation is put into the lukewarm water and stirred sufficiently. Leave for a time. This is to activate the microorganism. Thereafter, the microbial preparation put in the lukewarm water is administered from the manhole 9 into the sludge 4 in the building pit 1 by removing the manhole cover 10.

The most preferred microbial preparation 7 is Solvac (trade name) manufactured by Polyvac, USA. The dose of Solvac was 500 g to 1 kg per 10 m ³ of sewage.
Specifically, 1 kg of Solvab was administered immediately after the inside of the building pit 1 was cleaned, and 1 week thereafter, 1 kg of Solvac was administered, and thereafter, 500 g of Solvac was administered every two weeks. The supply amount of air by the air supply device 5 is 60
Liters per minute.

The microorganisms of Solvac penetrate into the sludge settled in the wastewater in the building pit 1 and decompose the sludge. At this time, the air is continuously supplied by the air supply device 5 to activate the microorganisms. The biodegradation of sludge is performed very efficiently. As a result, no scum was generated in the wastewater in the building pit 1, and no pests such as mosquitoes, flies and fly were found.

As described above, according to the wastewater treatment method for a building pit according to the present embodiment, the air 6 is continuously supplied to the wastewater 4 in the building pit 1 by the air supply device 5, and the microorganisms in the wastewater 4 By activating the microorganisms of the preparation, sludge can be sufficiently decomposed by the microorganisms and scum can be completely prevented. Moreover, since no scum is generated, it is possible to prevent the occurrence of pests such as mosquitoes, flies and flies, and furthermore, since no sludge is deposited, it is also possible to prevent the generation of hydrogen sulfide which is a cause of offensive odor. it can.

Here, the air supply device 5 will be described in detail. As shown in FIG. 1 and FIG. 2, the air supply device 5 is dedicated to sewage treatment of a building pit, and includes an electromagnetic air pump 11, a pressure-resistant hose 12, an air introduction pipe 13, and an air blowing pipe 14. Things.

The electromagnetic air pump 11 is installed outside the building pit 1. Specifically, a stainless steel table 33 is installed on the concrete floor 8, and the electromagnetic air pump 11 is mounted on the stainless steel table 33. The power cord 15 of the electromagnetic air pump 11 is connected to the earth leakage breaker 32.
Is connected to a 100 V outlet 31 via the.
The main specifications of the electromagnetic air pump 11 used here are a voltage of 100 V, an input of 61 W, and an air volume of 60 liter / min.

The pressure-resistant hose 12 is flexible and is generally commercially available. And pressure-resistant hose 1
One end of 2 is connected to the air outlet 18 of the electromagnetic air pump 11 by a hose stopper 21, and the other end of the pressure-resistant hose 12 is inserted into a hole 10 a formed in the manhole cover 10 of the building pit 1 to form the inside of the building pit 1. Extends to
The pressure-resistant hose 12 has an inner diameter of 15 mm and an outer diameter of 20 mm. The diameter of the hole 10a of the manhole cover 10 is 26
mm. The pressure hose 12 and the manhole cover 10
There is a slight gap between the hole 10a and the hole 10a. In the case where the hole 10a cannot be opened in the manhole cover 10, the concrete floor 8 as shown by a dashed line in FIG.
The pressure-resistant hose 12 is inserted through the hole 16.

The air introduction pipe 13 is made of a stainless steel pipe (inner diameter 16 mm, outer diameter 18 mm), is located in the building pit 1, one end is connected to the other end of the pressure-resistant hose 12, and the other end is directed downward. And near the bottom 1a of the building pit 1. As shown in FIG. 3, a connection pipe 23 having a smaller outer diameter than the air introduction pipe body is welded to one end of the air introduction pipe 13, and the other end of the pressure-resistant hose 12 is connected to the connection pipe 23. Have been. The pressure-resistant hose 12 and the connection pipe 23 are fixed by a hose stopper 24. The connection pipe 23 is also a stainless steel pipe (inner diameter 13 mm, outer diameter 17 mm).

As shown in FIGS. 2 and 4, the air blowing pipe 14 is a stainless steel pipe (inner diameter 19 mm, outer diameter 2 mm).
2 mm), connected to the other end of the air introduction pipe 13 and disposed on the bottom surface 1a in the building pit 1, and blows air into the sewage in the building pit 1 from a plurality of air blowing holes 14a. That is, the air 14 supplied from the electromagnetic air pump 11 is supplied to the pressure-resistant hose 12 and the air introduction pipe 13.
Through the air outlet hole 14a of the air outlet pipe 14. The air blowing pipe 14 and the air introducing pipe 13 are fixed by bolts 25.

Further, the air blowing pipe 14 is formed in a rectangular shape large enough to be inserted into the building pit 1 from the manhole 9 of the building pit 1. Specifically, the air blowing pipe 14 has a square shape with one side of 30 cm.
The diameter of the manhole of the building pit is not uniform, but any manhole can be inserted into the building pit from any manhole as long as the square air blowing pipe 14 has a side of 30 cm in size.

The air blow holes 14a of the air blow pipe 14 are formed only on the four corners of the air blow pipe 14. In the illustrated example, four air blowing holes 14a each having a diameter of 3 mm are formed at each corner of the air blowing pipe 14, and a total of 16 air blowing holes 14a are formed.

The shape of the air blowing pipe 14 is not necessarily limited to a rectangular shape, but may be a circular shape as shown in FIG. In this case, the air blowing holes 14a are formed only at four sides of the air blowing pipe 14 at substantially equal intervals in the circumferential direction. In the illustrated example, four air blowing holes 14a each having a diameter of 3 mm are formed at each position of the air blowing pipe 14, so that a total of 16 air blowing holes 14a are formed.

As described above, according to the air supply device 5 of the present embodiment, one end is connected to the electromagnetic air pump 11 and the other end is inserted into the hole 10 a formed in the manhole cover 10 of the building pit 1. And the flexible pressure-resistant hose 12 extending into the building pit 1, that is, the flexible pressure-resistant hose 1 is inserted into the hole 10 a of the manhole cover.
By using 2, the manhole cover 10 can be opened and closed even if the air supply device 5 is left installed, so that the air supply device is suitable for sewage treatment of building pits. Further, the air supply device 5 is very inexpensive, and even if the cost of the microbial preparation is added to the air supply device 5, it is possible to prevent the generation of scum in the building pit 1 at a very low cost.

That is, at the beginning of the development, the hole 10a of the manhole cover is formed.
The manhole cover 10 cannot be opened with the air supply device installed, and the manhole cover 10 must be opened after removing the stainless steel pipe. Was. On the other hand, when the flexible pressure-resistant hose 12 is used in the insertion portion of the hole 10a of the manhole cover, as shown in FIG. The pressure-resistant hose 12 can be moved freely as the manhole cover 10 moves.
Can be freely bent (bent), so that the manhole cover 10 can be opened and closed even when the air supply device 5 is left installed.

Further, since the air blowing pipe 14 and the air introducing pipe 13 are made of corrosion-resistant metal pipes (here, stainless steel pipes), they have a certain weight, so that weights are attached. Even without it (the weight may come off), the air blowing pipe 14 can be submerged in the sewage, and even if the air blows out from the air blowing pipe 14 vigorously, there is no fluctuation.

Further, according to the air supply device 5 of the present embodiment, the air blowing pipe 14 is formed in a rectangular shape large enough to be inserted into the building pit 1 from the manhole 9 of the building pit 1 and has four side surfaces at the four corners. By forming the air blowing holes 14a only in the air, as shown in FIG. 4 (a), the air is blown out from the respective air blowing holes 14a in all directions.
As a result, microorganisms can be activated in a wide area in the building pit 1 and generation of scum can be prevented.

Incidentally, at the beginning of the development, the air blowing holes 14a are provided uniformly on the upper surface of the air blowing pipe 14 as shown in FIG. 7, but in such a configuration, the air is injected upward and does not spread to the surroundings. The force of the blown air is weak. On the other hand, when the air blowing holes 14a are formed only on the side surfaces of the four corners of the air blowing pipe 14 as described above, the air is blown out in four directions.

Also, in the case where the air blowing pipe 14 is formed in a circular shape and the air blowing holes 14a are formed only at four side surfaces at substantially equal intervals in the circumferential direction, as shown in FIG. Air is blown out from the air blowing holes 14a in four directions, and as a result, microorganisms can be activated in a wide area in the building pit 1 and generation of scum can be prevented.

Further, according to the air supply device 5 of this embodiment, the connection pipe 23 having a smaller outer diameter than the main body of the air introduction pipe is welded to one end of the air introduction pipe 13. The other end of the pressure-resistant hose 12 is connected to the pressure-resistant hose 12 so that even if the diameter of the pressure-resistant hose 12 is small, the pressure-resistant hose 12 can easily be connected to the air blowing pipe 13.
Can be connected to In other words, there is no large-diameter hose in a commercially available pressure-resistant hose.
It is very difficult to connect the pressure-resistant hose 12 having a smaller diameter to the air introduction pipe 13 as it is because the expansion of the pressure-resistant hose 12 due to the extension of the pressure-resistant hose 12 is small. Therefore, as described above, the connection pipe 23 having a smaller outer diameter than the air introduction pipe main body is welded to one end side of the air introduction pipe 13 so that the pressure-resistant hose 12 can be easily connected.

In some building pits, only toilet drainage or only wastewater flows into the building pit, and it is effective to apply the present invention to the wastewater treatment of such a building pit. Because a large amount of water is generated especially in the building pit where miscellaneous drainage flows,
When the present invention is applied to the wastewater treatment of such a building pit,
In particular, the effect is remarkable.

[0039]

As described above, according to the first embodiment of the present invention, according to the method for treating wastewater in a building pit according to the first invention, air is continuously supplied to the wastewater in the building pit by an air supply device. Then, by activating the microorganisms of the microbial preparation in the sewage, the sludge is sufficiently decomposed by the microorganisms and the generation of scum can be completely prevented. Moreover, since no scum is generated, it is possible to prevent the occurrence of pests such as mosquitoes, flies and flies, and furthermore, since no sludge is deposited, it is also possible to prevent the generation of hydrogen sulfide which is a source of offensive odor. it can.

According to the air supply device of the second invention,
One end is connected to an air pump, and the other end is provided with a flexible hose that is inserted into a hole formed in the manhole cover of the building pit and extends into the building pit. By using a flexible hose, the manhole cover can be opened and closed even when the air supply device is installed, so that the air supply device is suitable for wastewater treatment of a building pit.

Moreover, this air supply device is very inexpensive, and even if the cost of a microbial preparation is added to this air supply device, the generation of scum in the building pit can be prevented at a very low cost. Furthermore, since the air blowing pipe and the air introducing pipe are made of corrosion-resistant metal pipes (here, stainless steel pipes), they have a certain weight and can be blown out without any weight. The pipe can be submerged in the sewage, and the air does not fluctuate even if the air blows out from the air blowing pipe.

According to the air supply device of the third invention, the air blowing pipe is formed in a rectangular shape large enough to be inserted into the building pit from the manhole of the building pit, and the air blowing holes are formed only on the side surfaces of the four corners. Is formed, the air is blown out from each air blowing hole in four directions, and as a result, microorganisms can be activated in a wide area in the building pit, and generation of scum can be prevented.

Further, according to the air supply device of the fourth invention,
By forming the air blowing pipe in a circular shape and forming air blowing holes only at four side surfaces at substantially equal intervals in the circumferential direction, air is blown out from each air blowing hole in all directions. As a result, microorganisms can be activated over a wide area in the building pit, and the occurrence of scum can be prevented.

According to the air supply device of the fifth invention,
A connection pipe having a smaller outer diameter than the air introduction pipe body is welded to one end of the air introduction pipe, and the other end of the pressure-resistant hose is connected to this connection pipe. Also, this pressure-resistant hose can be easily connected to the air blowing pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a method for treating wastewater in a building pit according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing an extracted air supply device shown in FIG. 1;

FIG. 3 is an enlarged view of a portion E in FIG. 2;

FIG. 4A is a plan view extracting and showing an air blowing pipe (rectangular shape) provided in the air supply device, and FIG.
(C) is a view in the B direction of (a),
(D) is a view in the direction of arrow C in (a), and (e) is a view in the direction of arrow D in (a).

FIG. 5 is a plan view showing another configuration (circular shape) of the air blowing pipe.

6A and 6B are a cross-sectional view and a plan view showing a state where a manhole cover of a building pit is removed.

FIGS. 7A and 7B are a plan view and a side view showing another configuration (uniform air blowing holes) of the air introduction pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building pit 1a Bottom of building pit 2 Miscellaneous drainage from kitchen 3 Toilet drain 4 Wastewater in building pit 5 Air supply device 6 Air 7 Microbial preparation 8 Concrete floor 9 Manhole 10 Manhole cover 10a Manhole cover hole 11 Electromagnetic air pump 12 Pressure hose Reference Signs List 13 air introduction pipe 14 air blowing pipe 14a air blowing hole 15 power cord 16 hole in concrete floor 18 air outlet of electromagnetic air pump 21 hose stop 22 sealing material 23 connection pipe 24 hose stop 25 volt 31 outlet 32 earth leakage breaker 33 Stainless steel table

Claims (5)

[Claims] 1. In order to biodegrade sludge in sewage stored in a building pit, a microbial preparation is periodically administered to the sewage in the building pit, and continuously supplied to the sewage in the building pit by an air supply device. A wastewater treatment method for a building pit, characterized by activating the microorganisms of the microorganism preparation in the wastewater by supplying air in a concentrated manner. 2. In the wastewater treatment of the building pit, the wastewater of the building pit is used to activate microorganisms of a microbial preparation that is periodically administered to the wastewater of the building pit in order to biodegrade the sludge in the wastewater in the building pit. An air supply device for continuously supplying air therein, and an air pump installed outside the building pit, one end of which is connected to the air pump and the other end of which is opened in a manhole cover of the building pit. A flexible hose inserted into the hole and extending into the building pit, comprising a corrosion-resistant metal pipe, inside the building pit, one end connected to the other end of the hose, The end side consists of an air introduction pipe extending downward to near the bottom of the building pit, and a metal pipe having corrosion resistance, and is connected to the other end side of the air introduction pipe. Is disposed on the bottom surface within the Birupitto, the air supply apparatus characterized by comprising and an air blowing pipe for blowing air into sewage in the plurality of air outlet holes Birupitto. 3. The air supply device according to claim 2, wherein the air blowing pipe is formed in a rectangular shape large enough to be inserted into the building pit from a manhole of the building pit, and air is provided only on four side surfaces of four corners thereof. An air supply device having a blowout hole. 4. The air supply device according to claim 2, wherein the air blowing pipe is formed in a circular shape large enough to be inserted from the manhole of the building pit into the building pit, and has substantially equal intervals in the circumferential direction. An air supply device, wherein air blowing holes are formed only at four side surfaces. 5. The air supply device according to claim 2, wherein a connection pipe having a smaller outer diameter than an air introduction pipe body is welded to one end of the air introduction pipe. The other end of the hose is connected to the air supply device.