JP3200810B2 - Float type supernatant water collecting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float type supernatant water collecting apparatus, and more particularly to a scum (scum; scum; scum which floats in the vicinity of the water surface in a lump or film form of fats and oils and microorganisms). The present invention relates to a float type supernatant water collecting device improved so as to prevent the operation from being hindered. In particular, it is useful for installation in a batch reactor in a small-scale sewage treatment facility for treating sewage such as industrial wastewater, sewage, and settlement wastewater from factories and canteens.

[0002]

2. Description of the Related Art FIG. 7 is an end view showing a basic structure of a float type supernatant water collecting apparatus disclosed in Japanese Utility Model Publication No. 6-7762. This float type supernatant water collecting device 500
A pair of main float chambers 11a and 11b having a constant buoyancy with respect to raw water (industrial wastewater, sewage, settlement wastewater, etc.) W
A water collecting trough 54 formed on an upper portion of a bottom plate B horizontally fixed between the main float chambers 11a and 11b and having a plurality of water collecting holes H formed therein; , A sub-float chamber 55 for adjusting buoyancy by supplying and discharging air to and from the closed space, an air supply valve 51 for supplying and exhausting air to and from the closed space of the sub-float chamber 55, and exhaust air A supply / exhaust pipe 53 having a valve 52, an excess air exhaust pipe 56 for letting out air equal to or more than the upper limit air amount in the sub-float chamber 55, and a supernatant water flowing from a water collecting hole H of the water collecting trough 54 to the outside. The water intake flange 57 and the discharge pipe 58 are provided.

Next, the above-mentioned float type supernatant water collecting device 50
The operation of 0 will be described. (1) Raw water W is introduced into the batch processing tank, and the float type supernatant water collecting device 500 is floated. The closed space of the sub-float chamber 55 is sufficiently filled with air, and the buoyancy is sufficiently increased. Then, since the water collecting hole H of the water collecting trough 54 is located above the water surface, the raw water W does not flow into the water collecting trough 54. When the batch processing tank is full, stop introducing raw water. (2) The stirrer in the batch processing tank is started to uniformly disperse sludge in the tank and perform anaerobic treatment. The anaerobic treatment time is, for example, about one hour. Thereafter, the stirring device is stopped. (3) The aeration blower in the batch processing tank is operated to diffuse bubbles into the raw water W to perform aerobic treatment. The time of the aerobic treatment is, for example, about one hour. Thereafter, the aeration blower is stopped. (4) The batch processing tank is allowed to stand still, and a precipitation treatment is performed for, for example, about 1 to 2 hours. (5) The exhaust valve 52 is opened to discharge air in the closed space of the sub-float chamber 55 to reduce buoyancy. As a result, the float type supernatant water collecting device 500 slightly sinks, and the water collecting hole H of the water collecting trough 54 is located below the water surface, and the supernatant water flows into the water collecting hole H. Then, the supernatant water is sent to a subsequent processing step (such as a filtration treatment or a sterilization treatment) through the water intake flange 57 and the discharge pipe 58. The discharge time is, for example, about one hour. (6) Close the exhaust valve 52 and open the air supply valve 51 to supply air into the closed space of the sub-float chamber 55 to increase buoyancy. Thereby, the float type supernatant water collecting device 500
However, the water collecting hole H of the water collecting trough 54 is located above the water surface. The air supply valve 51 is closed, the process returns to (1), and the processes after (1) are repeated.

It is to be noted that a fixed type supernatant water collecting device is not a float type supernatant water collecting device, but a related technology is as follows.
Japanese Patent No. 25662397 discloses that a movable overflow weir is provided in a batch type processing tank, and scum floating on the water surface in the batch type processing tank is collected near the movable overflow weir by an external wind. There is disclosed a technique of lowering a weir to open an outlet and discharging scum from the opened outlet.

[0005]

In the conventional float type supernatant water collecting device 500, as the floating and sinking operation is repeated, as shown in FIG.
Are filled in the sub-float chamber 55, concentrated and hardened. Then, the hardened scum S adheres so as to close the openings of the supply / exhaust pipe 53 and the excess air exhaust pipe 56, and it becomes difficult to exhaust air from the closed space of the sub-float chamber 55, and it becomes difficult to adjust buoyancy. . That is, in the conventional float type supernatant water collecting device 500, there is a problem that the scum S is concentrated and hardened as the floating and sinking operation is repeated, and the hardened scum S prevents the floating and sinking operation. The prior art disclosed in the above-mentioned Japanese Patent No. 25662397 is applicable to a float type supernatant water collecting apparatus, but has a problem that it is difficult to actually apply the apparatus because the equipment scale is large. Therefore, an object of the present invention is to provide a float type supernatant water collecting device improved so as to prevent the scum from hindering the floating and sinking operation.

[0006]

According to a first aspect of the present invention, there is provided a float chamber for forming a closed space on a water surface and adjusting a floating position with respect to the water surface by adjusting the amount of air in the closed space. In the equipped float type supernatant water collecting device,
The present invention provides a float type supernatant water collecting device, comprising a water spraying means for spraying water into the inside of the float chamber.
In the float type supernatant water collecting device according to the first aspect, since water is sprinkled into the float chamber, the scum floating on the water surface in the float chamber can be prevented from being dispersed, concentrated, and hardened. For this reason, it is possible to prevent the air in the closed space of the float chamber from being easily adjusted. Further, it is possible to prevent the cured scum from blocking the exhaust pipe and the like. Therefore, the floating operation can always be suitably performed. Further, since only the watering means is provided, there is an advantage that the equipment scale can be small.

According to a second aspect of the present invention, in the float type supernatant water collecting apparatus having the above structure, a water introducing means for introducing the water for water spraying into an exhaust pipe for exhausting air in the closed space is provided. Provided is a float type supernatant water collecting device provided with: In the float type supernatant water collecting apparatus according to the second aspect, even when scum enters the exhaust pipe, water can be introduced into the exhaust pipe to flow out the scum.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this. FIG. 1 is an end view showing a float type supernatant water collecting device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1 viewed from the side. The float type supernatant water collecting device 100 includes a pair of main float chambers 11a, 11 having a constant buoyancy with respect to the raw water W.
1b, a water collecting trough 14 formed above a bottom plate B horizontally fixed between the main float chambers 11a and 11b and having a large number of water collecting holes H, a lower surface of the bottom plate B and a water surface. And a sub-float chamber 15 for adjusting the buoyancy by supplying and discharging air to and from the closed space, and a watering nozzle 1a for discharging cleaning water or air into the sub-float chamber 15. 1b, 1c, 1d, a water supply / air supply pipe 4 to which a water supply valve 2 for supplying clean water to the water spray nozzles 1a to 1d and an air supply valve 3 for supplying air, and the sub-float chamber 15, an exhaust pipe 6 to which an exhaust valve 5 for exhausting air from the closed space, a water introduction valve 7 for introducing the clean water into the exhaust pipe 6, and an upper limit air amount in the sub-float chamber 15. More air An air exhaust pipe 16, and is configured by including the intake flange 17 and discharge pipe 18 guides the supernatant water flowing in from the water collection hole H of the water collecting trough 14 to the outside.

FIG. 3 shows this float type supernatant water collecting device 1.
It is a flowchart which shows the water purification process when 00 is installed in a batch processing tank. In the initial state, the raw water W is introduced into the batch treatment tank, the float-type supernatant water collecting device 100 is floating, and the closed space of the sub-float chamber 15 is sufficiently filled with air. It is assumed that the air valve 3, the exhaust valve 6, and the water introduction valve 7 are all closed. In step ST1, raw water W is introduced into the batch processing tank. At this time, the buoyancy of the sub-float chamber 15 is sufficiently large,
The water collecting hole H of No. 4 is above the water surface, and the raw water W does not flow into the water collecting hole H. When the water is full, introduction of the raw water W is stopped. The introduction time of the raw water W is, for example, about one hour. In step ST2, the stirrer in the batch processing tank is started to uniformly disperse the sludge in the tank and perform anaerobic treatment. The anaerobic treatment time is, for example, about one hour. Thereafter, the stirring device is stopped. In step ST3, the aeration blower in the batch processing tank is operated to diffuse bubbles into the raw water W, thereby performing aerobic treatment. The time of aerobic treatment is
For example, about one hour. Thereafter, the aeration blower is stopped.

In step ST4, as shown in FIG.
Open the water supply valve 2 and spray clean water from the spray nozzles 1a to 1d. Further, the water introduction valve 7 is opened, and the clean water is introduced into the exhaust pipe 6. The amount of water sprayed from each of the watering nozzles 1a to 1d is, for example, about 5 liters / minute · pieces to 10 liters / minute · pieces. Then, as shown in FIG.
The scum S floating on the water surface in 5 can be prevented from being dispersed, concentrated and hardened. Also, watering nozzles 1a to 1d
The scum S adhering to the wall surface in the sub-float chamber 15, the exhaust pipe 6, the excess air exhaust pipe 16 and the like is torn off by the jet flow from the sub-float chamber 15, and is discharged to the outside of the apparatus by the downward flow. Further, the scum S that has entered the pipe is flushed out by the clean water introduced into the exhaust pipe 6. In step ST5,
Watering is continued until a predetermined watering time elapses, and when the watering time elapses, the process proceeds to step ST6. The watering time is, for example, about 5 minutes. In step ST6, the water supply valve 2 is closed to stop watering. As shown in FIG. 6, since the scum S is discharged out of the apparatus, the inside of the sub-float chamber 15 and the water surface immediately below the sub-float chamber 15 are in a clean state in which the scum S hardly exists. In step ST7, watering is suspended until a predetermined watering suspension time elapses, and after that, the process proceeds to step ST8. The watering suspension time is, for example, about 5 minutes. In step ST8, if the predetermined aerobic processing time has not elapsed, the process returns to step ST4. When the predetermined aerobic processing time has elapsed, the process proceeds to step ST9. The aerobic treatment time is, for example, about one hour.

In step ST9, the aeration blower is stopped. In step ST10, the batch processing tank is allowed to stand still and, for example, a settling process is performed for about 1 to 2 hours. Step ST
At 11, the exhaust valve 3 is opened to exhaust the air in the closed space of the sub-float chamber 15. This reduces buoyancy,
The float type supernatant water collecting device 100 sinks a little, and the water collecting hole H of the water collecting trough 54 is located below the water surface, and the supernatant water flows into the water collecting hole H. Then, the supernatant water is sent to a subsequent processing step (such as a filtration treatment or a sterilization treatment) through the water intake flange 57 and the discharge pipe 58. The discharge time is, for example, about one hour. In step ST12,
The exhaust valve 3 is closed. In step ST13, the air supply valve 3 is opened and the sub-float chamber 1 is opened through the watering nozzles 1a to 1d.
Air is supplied into the closed space of No. 5. As a result, the buoyancy is increased, the float-type supernatant water collecting device 100 slightly floats, and the water collecting hole H is again above the water surface, so that the state returns to the state of step ST1. After that, the processing after step ST1 is repeated.

According to the above-mentioned float type supernatant water collecting apparatus 100, the scum S is prevented from being concentrated and hardened by injecting clean water from the water spray nozzles 1a to 1d. Since the attached scum S is peeled off and discharged outside the apparatus, it is possible to prevent the hardened scum S from hindering the floating operation. Further, since the clean water is introduced into the exhaust pipe 6, S can flow out from the scum that has entered the pipe.

[0013]

According to the float type supernatant water collecting apparatus of the present invention, it is possible to prevent the scum from being concentrated and hardened in the float chamber and to remove the scum attached to each part in the float chamber. Even if repeated, the scum does not hinder the floating and sinking operation. Therefore,
It is not necessary to interrupt the water treatment to remove the scum, and the water treatment can be continuously performed for a long time, and the treatment cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an end view showing a float type supernatant water collecting device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the float type supernatant water collecting device of FIG.

FIG. 3 is a flowchart showing a water purification process by the float type supernatant water collecting device of FIG. 1;

FIG. 4 is an explanatory diagram showing a state at the time of starting watering by the watering nozzle.

FIG. 5 is an explanatory view showing the principle of scum removal by a watering nozzle.

FIG. 6 is an explanatory diagram showing a state in which scum removal by a watering nozzle is completed.

FIG. 7 is an end view showing an example of a conventional float type supernatant water collecting device.

FIG. 8 is an explanatory view showing a state of scum attached to each part of the float type supernatant water collecting device of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Float type supernatant water collecting apparatus 1a, 1b, 1c, 1d Sprinkling nozzle 2 Water supply valve 3 Air supply valve 4 Water supply / air supply pipe 5 Exhaust valve 6 Exhaust pipe 7 Water introduction valve 11a, 11b Main float chamber 14 Collection trough 15 Sub-float chamber 16 Excess air exhaust pipe 17 Water intake flange 18 Discharge pipe B Bottom plate H Water collecting hole W Raw water

Claims (2)

(57) [Claims] 1. A float type supernatant water collecting device comprising a closed space on a water surface and a float chamber for adjusting a floating position with respect to the water surface by adjusting an amount of air in the closed space. 1. A float type supernatant water collecting device, comprising: a water spraying means for spraying water into the inside. 2. The float type supernatant water collecting apparatus according to claim 1, further comprising a water introducing means for introducing the water for watering into an exhaust pipe for exhausting air in the closed space. Float type supernatant water collecting device.