JPH0871550A - Apparatus for drifting floating matter on surface of liquid - Google Patents

Abstract

PURPOSE: To provide an apparatus capable of drifting and moving floating matter on the surface of a liquid to an arrival objective position without sedimenting the same. CONSTITUTION: In an apparatus for drifting the floating matter on the surface of a liquid by blowing out air 16 from the air blowoff pipe 8 provided to the space part above the surface of the liquid 2 to move the floating matter 10 on the surface of the liquid to an arrival objective position 11, an air suction pipe 3 is provided at the arrival objective position 11 of the floating matter 10 or at the upper space part on the downstream side of the position 11 to be connected to the air blowoff pipe 8 by connection ducks 5, 7 and a blower 6 forming the circulating stream of air 16 is provided to this connection ducts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for blowing liquids on a liquid surface, and more particularly to liquids in headraces, sedimentation basins, storage tanks, ponds, tanks, waterways in the field of food processing in sewage or wastewater treatment facilities. Without sinking the floating matter floating on the surface,
TECHNICAL FIELD The present invention relates to a device for blowing liquid floating matter to a target position.

[0002]

2. Description of the Related Art There is a demand for a technique for efficiently separating and recovering a suspended matter floating on the water surface in a wastewater or sewage treatment facility, such as a first sedimentation basin. Examples of such a blowing device or a scraping device for the liquid surface suspended matter include a water spray device that sprays water in a predetermined direction toward the water surface, an air blowing device that blows a predetermined amount of air at a predetermined angle, three axes or four. A scraper such as a shaft or a combination thereof is known.

FIG. 11 is a sectional view showing a conventional scum removing device (Japanese Utility Model Laid-Open No. 3-123594). This scum removing device is used for treating water 1 stored in a sedimentation basin 101.
03 near the water surface 102, and three shafts 105 provided so as to be submerged in the bottom thereof, respectively, and sprockets 106 provided on the shafts 105, respectively.
Chain 107 erected on these three sprockets
And a triaxial scratcher 109 having a plurality of flights 108 provided at equal intervals on the chain 107, and a weir 115 provided on the water surface 102 on the downstream side of the triaxial scratcher 109.
114, an air feed pipe 111 extending in the upper space portion of the water surface 102 in the direction of the trough 114 along the water surface 102, a plurality of air pipes 112 branched from the air feed pipe 111, and the air pipe 112. And an air blowing device having an air ejection port 113 provided in the.

In such a structure, the three-axis type scraper 109 is driven, and the scum (not shown) floating on the water surface 102 is scraped toward the trough 114 by the flight 108 of the three-axis scraper 109. , Overflows the weir 115 and flows into the trough 114. At this time, the air ejection port 1 provided in the air pipe 112 of the air blowing device 110
A predetermined amount of air is blown from 13 toward the liquid surface at a predetermined angle, and the movement of the scum attracted by the flight 108 of the attractor 109 in the trough 114 direction is promoted.

[0005]

However, the above-mentioned conventional air blowing device not only disturbs the air on the water surface of the settling basin and diffuses the odors, dangerous gases, etc. generated on the liquid surface, but also spreads on the water surface. Since the superficial flow formed is not constant, there is a problem that the suspended matter diffuses and the transport effect decreases, and a sufficient blowing effect cannot be obtained.

The object of the present invention is to solve the above-mentioned problems of the prior art, to form a stable surface flow on the liquid surface of a headrace, a settling basin, etc., and to reach the object without sedimenting the suspended matter by the surface flow. An object of the present invention is to provide a liquid surface floating material blowing device that can be moved or collected to a position.

[0007]

In order to achieve the above object, the invention claimed in the present application is as follows. (1) An air blow-out pipe is provided in an upper space of the liquid level, and air is blown from the air blow-out pipe toward the liquid level at a predetermined angle to move the liquid level float to a target position to be reached. In the blowing device, an air suction pipe is provided in an upper space portion on the downstream side of the reaching position of the floating matter or on the downstream side of the reaching target position, and the air suction pipe and the air blowing pipe are connected by a communication duct, and the communication is performed. The air is sucked into the duct from the air suction pipe, is blown toward the liquid surface through the communication duct and the air blowing pipe, forms a surface layer flow accompanied by the suspended matter on the liquid surface, and flows into the air suction pipe. And a blower for forming a circulating flow of air. (2) The air suction pipe and the air blowing pipe are provided in a space portion between the lid or the upper floor slab and the liquid surface in the underdrain where the liquid surface is covered with the lid, and the air suction pipe and the air blowing are provided. The liquid surface suspended matter according to claim 1, wherein the pipes are connected by a communication duct extending through the lid or the upper floor slab, and the communication duct is provided with a blower that forms a circulating flow of the air. Blowing device. (3) An adjusting means is provided for adjusting a distance between an air outlet and a liquid surface provided in the air outlet pipe and an outlet angle of air blown from the air outlet pipe toward the liquid surface. The liquid surface floating matter blowing device according to claim 1 or 2. (4) The floating material blowing device according to any one of claims 1 to 3, which is provided in a space above the liquid surface of a sedimentation tank or a storage tank provided with a scraper.

[0008]

The target position of the floating material or the target position of the floating material in the liquid surface floating material blowing device that blows air from the air blowing pipe toward the liquid surface to move the solid matter floating on the liquid surface to the target position. , An air suction pipe is provided in the upper space portion on the downstream side in the floating material movement direction, the air suction pipe and the air blowing pipe are connected by a communication duct, and a blower is provided in the communication duct, thereby It is sucked from the suction pipe, reaches the air blowing pipe through the communication duct, is blown out from the air blowing pipe toward the liquid surface, forms a surface layer flow with suspended matter on the liquid surface, and flows into the air suction pipe. Since it is possible to form a circulating flow of air, the liquid surface suspended matter moves to the destination position along with the surface layer flow without settling.

In the present invention, the liquid surface is not limited to a specific liquid surface. The liquid surface floating material blow-off device of the present invention is applied to, for example, a headrace, a settling tank, a storage tank, etc. in a sewage or wastewater treatment plant facility, etc., but can also be applied to a reservoir, a tank, etc. in the food processing field. This liquid surface floating matter blowing device has a remarkable effect when applied to a so-called covered facility covered with a lid. That is, when applied to a covered facility, there is no inflow or outflow of air to the outside,
Since only the internal air is forcedly circulated, leakage of odors, dangerous gases, etc. in the covered facility to the outside is prevented.

In the present invention, the air suction pipe is provided in a space above the liquid surface such as a water conduit or a sedimentation basin and sucks air on the liquid surface. The air blow-out pipe has an air blow-out port corresponding to the air suction port of the air suction pipe. It is provided in the upper space above the liquid surface such as a pond. The air suction pipe may be provided at a position overlapping with the intended arrival position of the floating matter in a plan view.

In the present invention, the target position of the floating material is a target position for blowing a solid material floating on the liquid surface, such as scum, for example, an inlet of the floating material in a floating material collecting device, a trough or the like. Refers to the installation location. What is a blower?
Provided in a communication duct connecting the air suction pipe and the air blowing pipe, the air on the liquid surface sucked from the air suction pipe is discharged from the air blowing pipe through the communication duct toward the liquid surface at a predetermined angle. It is blown out to form a surface layer flow accompanied by suspended matter on the liquid surface to form a circulating flow of air flowing into the air suction pipe.

In the present invention, when the liquid surface is covered with a lid, for example, in an underdrain or the like, the air suction pipe and the air blowing pipe are provided in a space portion surrounded by the lid and the liquid surface. When the installation location is at the end of the underdrain or the like, it is preferable to provide the air suction pipe along the end. This can prevent turbulent air flow in the space between the lid and the liquid surface. The distance between the air suction pipe and the air blow-out pipe is not particularly limited, and is appropriately selected such that the floating target position of the floating substance is located therebetween.

In the present invention, if the distance to the target position of the floating material is long, or if the collection area of the floating material is large, it is preferable to provide the air suction pipes and / or the air blowing pipes in a plurality of stages or a plurality of rows. . Further, an inverter (rotation speed control device) can be used as the flow rate adjusting means of the circulating air of the blower. As a result, it becomes easy to form a liquid surface superficial flow that is appropriate for changes in the type, quality, quantity, etc. of suspended matter, and to easily adjust the air volume to obtain an optimum superficial flow velocity.

In the present invention, it is preferable to provide adjusting means for adjusting the distance between the outlet of the air outlet pipe and the liquid surface and means for adjusting the angle of the outlet air. Thus, the amount of sedimentation of suspended matter can be minimized by appropriately selecting the conditions for blowing air. Examples of the means for adjusting the distance between the outlet of the air outlet tube and the liquid surface include a duct provided with the air outlet tube or a device for extending or shortening the air outlet tube toward the liquid surface. Examples of the means for adjusting the air outlet angle include a device that allows the air outlet provided in the air outlet pipe to swivel and that swivels the air outlet to change the angle with the liquid surface. By making the air blow-out pipe or the air blow-out port provided at the tip thereof detachable, it is easy to improve or change the device after installation.

The liquid surface floating matter blowing apparatus of the present invention is combined with, for example, a four-axis type scraper, a weir, a skimmer, or another floating material recovery device to improve the efficiency of moving or collecting floating materials. Power consumption can be saved by centrally operating related equipment such as a blowing device and a collecting device.

[0016]

EXAMPLES Next, the present invention will be described in more detail by way of examples. FIG. 1 and FIG. 2 are explanatory views of a liquid surface floating matter blowing device showing an embodiment of the present invention, FIG. 1 is a plan view thereof, and FIG. 2 is a sectional view thereof. In the figure, this device is provided with an air blowing pipe 8 arranged in an upper space portion 15 of a liquid surface 2 covered by an upper wall 14 of an underdrain, and the air blowing pipe 8
And an air outlet 9 attached to the
The air suction pipe 3 having the air suction port 4 is provided in the upper space portion 15 along the end wall 13 in the downstream of the destination position (hereinafter, referred to as a trough for collecting suspended matter or simply trough) 11 of the air suction pipe 3. The pipe 3 and the air blowing pipe 8 are connected to each other by a communication duct composed of a suction side duct 5 and a blowing side duct 7 which extend through the upper wall 14, and the air suction pipe is connected to the communication duct. 3 is sucked from the air suction port 4, and is blown from the air blow port 9 toward the liquid surface 2 through the communication duct and the air blow pipe 8.
An air blower 6 is provided on the liquid surface 2 to form a superficial flow accompanied by suspended matter 10 to form a circulating flow of air 16 flowing into the air suction port 4 of the air suction pipe 3. Reference numeral 12 is a side wall of the underdrain 1.

In such a structure, the floating material 10 is blown up as follows. That is, the blower 6 is operated to operate the air 16 in the upper space of the liquid surface 2 from the air suction port 4.
Is sucked. The sucked air 16 is supplied to the air suction pipe 3,
The air blow-out pipe 8 flows into the air blow-out pipe 8 through a communication duct composed of the suction side duct 5 and the blow-out side duct 7.
A predetermined discharge amount from the air outlet 9 of, for example, 12 to 18 m
³ / min, a predetermined wind speed, for example, 25 to 37 m / sec, and is blown out at a predetermined angle with respect to the liquid surface 2, for example, 5 to 15 degrees, and the surface layer flow toward the trough 11 along with the suspended matter 10 on the liquid surface 2 To form a circulating flow that flows into the air suction port 4 as a wake. The suspended matter 10 smoothly flows into the trough 11 with the surface flow.

According to the present embodiment, the air blow-out pipe 8 and the air suction pipe 3 are provided in the upper space portion 15 between the liquid surface 2 of the underdrain 1 and the upper wall 14, and they are connected to each other through the upper wall 14. By connecting with a duct and providing the blower 6 in the communication duct, the air is sucked from the air suction pipe 3 and blown toward the liquid surface 2 through the communication duct 6 and the air blowing pipe 8,
Since a superficial flow accompanied by suspended matter 10 is formed on the liquid surface and a circulating flow of the air 16 returning to the air suction pipe 3 is formed again,
The suspended matter 10 can be smoothly blown up to the trough 11 by the surface layer flow formed on the liquid surface.

According to the present embodiment, since a circulating flow of air is formed in the flow path constituted by the upper space portion 15 and the communication duct which are shielded from the outside, the uncomfortableness generated from the liquid surface or the suspended matter is generated. It is possible to prevent leakage of odors, dangerous gases, etc. to the outside, and also to prevent noise from being diffused due to inhalation and blowing of air. Further, in the upper space portion 15, the surface layer flow can be synergistically promoted by the wind tunnel effect generated by the forced circulation flow by the blower, so that the effect of blowing the suspended matter 10 is improved. Further, since the air suction pipe 3 is provided at the end portion of the underdrain 1, it is possible to prevent the turbulence of the air circulation flow and further stabilize the air circulation flow.

According to the present embodiment, by acting only the air flow, that is, the wind force, on the suspended matter, even a suspended matter having a small buoyancy can be blown up to the target position without sinking. In this embodiment, the distance between the liquid surface 2 and the air suction port 4 is 300 to 1000 mm, preferably 400 to 500 mm. If it exceeds 1000 mm, turbulence of the circulating flow tends to occur, and if it is less than 300 mm, the circulating flow may be disturbed. The distance between the air outlet 9 and the liquid surface 2 is 100 to 300 mm, preferably 150 to 200.
mm. If it exceeds 300 mm, the blowing effect may decrease, and if it is less than 100 mm, sedimentation of suspended matter may occur. Further, the air outlet angle θ from the air outlet 9 is preferably 5 to 15 degrees, and particularly preferably 10 to 15 degrees. If it is less than 5 degrees, the blowing effect tends to be lowered, and if it is more than 15 degrees, the sedimentation of the suspended matter tends to be large. Further, if it is larger than 10 degrees and smaller than 15 degrees, the surface layer flow becomes stable, which is more preferable.

The amount of air blown out from the air outlet 9 is 12 to 18 m ³ / min, preferably 13 to ¹
It is 7 m ³ / min. If it exceeds 18 m ³ / min, the sedimentation of the suspended matter tends to be large, and if it is less than 12 m ³ / min, the blowing effect is deteriorated. The wind speed of the air blown from the air outlet 9 is 25 to 37 m / sec, preferably 27 to 34 m / sec. If it exceeds 37 m / sec, the sedimentation of the suspended matter tends to be large, and 25 m / sec
If it is less than, the blowing effect is reduced.

FIG. 3 and FIG. 4 show another embodiment of the present invention, in which the liquid surface floating material blowing device is combined with a four-axis type scraper and applied to a sedimentation basin covered with a lid. is there.
This liquid surface floating matter blowing device has an air blowing pipe 28 having an air blowing port 29, which is arranged in an upper space portion 39 of the water surface 22 of the settling basin 21 covered with a lid 34.
An air suction pipe 2 having an air suction port 24 in an upper space 39 thereof along a trailing end wall 33 of a zero-attainment target position (hereinafter, referred to as a suspended matter recovery trough or simply a trough) 31.
3, the air suction pipe 23 and the air blowing pipe 2 are provided.
8 are connected to each other by a communication duct composed of a suction side duct 25 and a blowout side duct 27 which extend through the lid 34, and the air suction pipe 23 is sucked from the air suction port 24 to the communication duct. The circulation of the air 40, which is blown out from the air outlet 29 toward the water surface 22 through the communication duct and the air outlet pipe 28, forms a superficial flow with suspended matter 30 on the water surface 22 and flows into the air inlet 24. A blower 26 for forming a flow is provided. On the other hand, the four-axis type scraper 38 has four sprockets attached to four shafts (two of which are not shown) buried below the water surface 22 of the sedimentation basin 21 covered with the lid 34. Two
The individual components are not shown) 35, a chain 36 that spans these four sprockets, and a plurality of flights 37 that are provided at predetermined intervals on the chain 36.

In such a structure, the floating material 30 floating on the water surface 22 of the settling basin 21 is recovered as follows. That is, the scraper 3 is driven by a drive device (not shown).
When 8 is driven and the chain 37 rotates in the direction of arrow A, the flight 38 attached to the chain 37 moves along the liquid surface 22 and scrapes the suspended matter 30 toward the trough 31. The chain 37 of the scraper 38 is the sprocket 3
After passing through 5a, the moving speed of the floating material 30 scraped up to the upper part of the sprocket 35a decreases because it advances toward the bottom of the sedimentation basin 21, but at this time, it is provided near the upper part of the sprocket 35a. Air outlet pipe 28
A predetermined angle from the air outlet 29 toward the water surface 22,
For example, since it is blown by the air 40 blown out at 5 to 15 degrees, the suspended matter 30 smoothly moves to the trough 31 and is collected.

The air 40 blown up by the suspended matter 30 is sucked from the air suction port 24 provided in the downstream of the trough 31, and the suction side duct 25, the blower 26, and the blowing side duct 2 are drawn.
7, reaches the air outlet pipe 28, and becomes a circulating flow that is again blown from the air outlet 29 toward the water surface 22,
The floating material 30 that is sequentially attracted by the attractor 38 is troughed into the trough 3
Blow towards 1.

According to this embodiment, the floating matter blowing device and the
In combination with the axial scraper, the air blow-out pipe 28 of the floating material blowing device is provided in the vicinity of the submerged position of the return side flight of the four-axis scraping machine, so that the floating material 30 scraped by the return flight is removed. Even after the flight 37 is submerged in water, it can be blown toward the trough 31 without being diffused, so that the recovery efficiency of the suspended matter is improved.

According to this embodiment, the sedimentation pond 2 covered with a lid
Since a circulation flow of air can be formed in the circulation flow path composed of the upper space 39 of No. 1 and the communication duct, in the upper space 39, a forced circulation flow by a blower and further covered with a lid. Therefore, since disturbance is prevented, the surface layer flow can be synergistically promoted by the wind tunnel effect, and the effect of blowing the suspended matter 30 is improved. Also in the device,
For example, the odor of sewage or the internal air 40 will not leak outside.

5 and 6 are explanatory views showing another embodiment of the present invention, FIG. 5 is a plan view thereof, and FIG. 6 is a sectional view. This liquid surface floating matter blowing device is applied when the floating substance transport distance, that is, the blowing distance is long, and branches by branching the blow-out duct 7 of the embodiment shown in FIGS. 1 and 2. The ducts 17a and 17b are provided, and the electric damper 1 is provided on the branch ducts 17a and 17b, respectively.
8a and 18b are provided, and air blowout pipes 8a and 8b are provided at the tip ends, respectively, and are arranged in two stages.

According to the present embodiment, the air blowing pipe is formed immediately before the flow velocity of the superficial flow accompanied by the suspended matter 10 formed on the liquid surface by the air 16 blown from the air blowing port 9b of the air blowing pipe 8b becomes small. Air 16 is blown out from the air blowout port 9a of 8a, and the flow velocity of the surface layer flow is recovered or increased by this, so that even if the blowoff distance of the suspended matter 10 is long, the floating speed is not lowered and the blowoff is smooth. You can

According to this embodiment, the electric damper 18 is
By appropriately operating a and 18b, it is possible to sequentially switch the air blowing pipes and blow the suspended matter efficiently. The air blowing tube 8 may have three stages or more. 7 and 8 are explanatory views showing another embodiment of the present invention. FIG. 7 is a plan view thereof and FIG.
Is a sectional view. This liquid surface floating material blowing device is applied to a wide sedimentation basin. The difference from the floating material blowing device of FIGS. 3 and 4 is that the sedimentation basin 21 is wide.
Air suction pipes 23a to 23c having air suction ports 24a to 24c are connected to the upper space 39 between the liquid surface 22 and the lid 34 along the end wall 33 of the settling tank 21, and the air blowing pipes are connected. Air blowing pipes 28a to 28c each having an air blowing port 29a to 29c are connected to the air sucking pipes 23a to 23a to 23c to the air sucking pipes 23a to 23c.
The intake side duct 25 is branched corresponding to c, the branched ducts 41a to 41c are provided with electric dampers 43a to 43c, and the outlet duct 27 is branched corresponding to the air blowing pipes 28a to 28c. The branch ducts 42a to 42c are provided with electric dampers 43d to 43f, respectively.

According to this embodiment, even in a wide sedimentation basin, a circulating flow of the air 16 is formed on the entire water surface 22 to form the water surface 2.
Since a superficial flow accompanied by the suspended matter 30 can be formed on the surface 2, all the suspended matter 30 floating on the water surface 22 can be efficiently blown up to the trough 31. Further, since the electric dampers 43a to 43f are provided so as to correspond to the air suction pipe and the air blowing pipe that are connected in series, the air sucking pipe and the air blowing pipe are sequentially operated by appropriately operating the electric dampers. The suspended matter 30 can be efficiently blown by switching.

In this embodiment, the number of the air suction pipes and the number of the air discharge pipes are three, respectively, but may be four or more, and the suction side duct 25 and the blow side duct 27 are each suction pipe. Also, each blow-out pipe may be provided independently. 9 and 10 are explanatory views showing still another embodiment of the present invention. FIG. 9 is a plan view,
FIG. 10 is a sectional view. This device is suitably applied when there is a large amount of floating matter floating on the liquid surface and it is compacted, and the outlet side duct 7 of the device shown in FIGS. 1 and 2 is branched into two. To form the branch ducts 17a and 17b, and the branch duct 17b on the upstream side in the floating material moving direction.
Air outlet pipe 8 having an air outlet 9b at the tip of the
In addition, the branch duct 17a on the downstream side in the floating material moving direction is extended to a position below the water surface of the settling tank 1, and the air 16 is blown upward toward the tip of the extended branch duct 17a. The outlet 19 is provided.

According to this embodiment, the outlet side branch duct 1
7a is extended to an effective position below the surface of the settling basin 1 and a stirrer outlet 19 is provided at the tip of the settler 1, so that air bubbles 16 of air 16 blown out from the agitator outlet 19 form a lumpy suspended matter. The collapsing suspended matter 10 can be efficiently blown by the air blown from the air blowout port 9b of the branch duct 17b.

In this embodiment, whether the blowing distance is long,
Alternatively, when the blowing width is wide, the air blowing pipes and the stirring blowing pipes may be provided in a plurality of stages or a plurality of rows, respectively. Also, by using a water spray device together,
It is also possible to promote the collapse effect and the blowing effect of the compacted suspended matter. At this time, the amount of spray water or the spray angle is appropriately selected within a range in which the suspended matter is not settled.

[0034]

According to the invention described in claim 1 of the present application, an air suction pipe and an air blowing pipe are provided on the liquid surface with the reaching target position of the suspended matter interposed therebetween, and these are connected by a communication duct. By providing a blower that circulates air in the communication duct, an undisturbed air circulation flow from the air blowing pipe to the air suction pipe is formed, and the circulation flow causes turbulence accompanied by the movement of suspended matter on the liquid surface. Since it is possible to form a surface layer flow that does not exist, the surface layer flow can blow the liquid surface suspended matter to the destination position without settling.

According to the second aspect of the present invention, the floating material blowing device having the air suction pipe and the air blowing pipe is applied to the liquid surface covered with the lid or the upper floor slab, for example, the covered sedimentation tank, the underdrain, or the like. By doing so, an air circulating flow that flows through the space between the liquid surface and the lid or the upper floor slab and does not come in and out of the outside is formed, and in addition to the effects of the above invention, it is not affected by disturbance. It is possible to form a stable surface layer flow in the air and efficiently blow the suspended matter, and it is possible to prevent the unpleasant odor generated from the suspended matter, liquid, etc., dangerous gas, etc. and noise from leaking to the outside. Therefore, it is not necessary to provide a dedicated deodorizing device and gas treatment device.

According to the invention of claim 3 of the present application, in addition to the effect of the invention, the suspended matter is provided by providing the means for adjusting the distance between the air outlet of the air outlet pipe and the liquid surface and the air outlet angle. Since it is possible to select the air blowing conditions that appropriately correspond to the differences in conditions such as type, amount, and presence / absence of consolidation, it is possible to minimize the sedimentation of the suspended matter. According to the invention of claim 4 of the present application, by combining the floating object blowing device with the scratching device, the floating object scraping effect of the scratching device can be supplemented, and thus the scraping efficiency is improved. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is an explanatory view showing another embodiment of the present invention.

FIG. 4 is a sectional view of FIG.

FIG. 5 is an explanatory view showing another embodiment of the present invention.

6 is a sectional view of FIG.

FIG. 7 is an explanatory view showing another embodiment of the present invention.

FIG. 8 is a sectional view of FIG.

FIG. 9 is an explanatory view showing still another embodiment of the present invention.

FIG. 10 is a sectional view of FIG.

FIG. 11 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Underdrain, 2 ... Liquid level, 3 ... Air blowing pipe, 4 ... Air blowing port, 5 ... Suction side duct, 6 ... Blower, 7 ... Blowing side duct, 8 ... Air blowing pipe, 9 ... Air blowing port, 10 … Floating matter, 11… Target position (trough), 12… Sidewall, 13
... End wall, 14 ... Upper wall, 15 ... Upper space part, 16 ... Air, 17a-b: Branch ducts, 18a-b ... Electric damper, 19 ... Stirring outlet, 21 ... Sedimentation pond, 22 ... Water surface, 23 ... air blowing pipe, 24 ... air blowing port, 25 ... suction side duct, 26 ... blower, 27 ... blowing side duct, 28
... air outlet pipe, 29 ... air outlet, 30 ... suspended matter,
31 ... Destination position (trough), 32 ... Side wall, 33 ... End wall, 34 ... Lid, 35 ... Sprocket, 36 ... Chain, 37 ... Flight, 38 ... 4-axis scraper, 39 ... Upper space part, 40 …air.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshito Nakamura 2661, Moriya Kou, Moriya-cho, Kitasoma-gun, Ibaraki Prefecture 29 (72) Inventor Kazutoshi Kazu 5-39-15 Higashiikebukuro, Toshima-ku, Tokyo (72) Invention Person Gohashi Ohashi 918 Sanina Mizuno, 918 Shiinazaki-cho, Midori-ku, Chiba-shi, Chiba Prefecture

Claims (4)

[Claims] 1. A liquid surface floating device, wherein an air blowing pipe is provided in an upper space portion of the liquid surface, and air is blown from the air blowing pipe toward the liquid surface at a predetermined angle to move the liquid floating matter to a target position. In the object blowing device, an air suction pipe is provided in the upper space portion on the downstream side of the floating object to reach the target position or to reach the target position, and the air suction pipe and the air blowing pipe are connected by a communication duct, The air suction pipe is sucked into the communication duct from the air suction pipe, is blown out toward the liquid surface through the communication duct and the air blowing pipe, and forms a surface layer flow accompanied by the suspended matter on the liquid surface. An air blower for forming a circulating flow of air, which flows into the air, is provided to blow the suspended matter on the liquid surface. 2. The air suction pipe and the air blowing pipe are provided in a space between the liquid surface and the lid or the upper floor slab in the underdrain where the liquid surface is covered with a lid, and the air suction pipe and 2. The liquid surface floating according to claim 1, wherein the air blowing pipes are connected by a communication duct extending through the lid or the upper floor slab, and a blower for forming a circulating flow of the air is provided in the communication duct. An object blowing device. 3. An adjusting means is provided for adjusting a distance between an outlet and a liquid surface provided in the air outlet pipe and an outlet angle of air blown from the air outlet pipe toward the liquid surface. The liquid surface floating matter blowing device according to claim 1 or 2. 4. The floating material blow-off device according to claim 1, which is provided in a space above the liquid surface of a sedimentation tank or a storage tank provided with a scraper.