JPH08290193A - Device for improving dissolved oxygen in river water or the like - Google Patents

Abstract

PURPOSE: To improve dissolved oxygen(DO) deficiency in water of a deep layer or bottom layer part of a river, lace or the like. CONSTITUTION: In this device, an inlet and outlet compartment 1 having an opening under-water is placed in a hull A which can be moved or moored. This compartment 1 is provided with an underwater agitator B so that it can be moved vertically from the compartment 1 to an optional underwater depth in a freely controllable manner, wherein the agitator B is composed of a casing 5 fitted with an impeller and a water suction cylinder 10 that has a required height and is connected to a suction port in the upper part of the casing 5. By operating the agitator B, water of an upper layer above the water suction cylinder 10 is sucked through the cylinder 10 and discharged from the lower part of the agitator B and thereby, the DO deficiency in water of the bottom layer of a river, lake or the like can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to D of water such as rivers and lakes.
The present invention relates to a water purifying device by agitation or aeration for improving O deficiency and the like.

[0002]

2. Description of the Related Art In recent years, inflow of various kinds of wastewater such as domestic wastewater into rivers and lakes has increased, and deterioration of water quality and pollution have become problems. As a countermeasure, inflow control of sewage and water purification have come to be performed. It can be said that a river has a larger purification capacity than a lake because the flow is larger than a lake. However, a poor DO layer is likely to be formed at the bottom of a river where the flow is gentle or at a stagnation of the flow. Therefore, water purification treatment is also required in rivers.

Conventionally, in the purification treatment of water in lakes and the like,
In general, a surface aeration method has been adopted in which a mechanical aerator is installed in a float and air is introduced into surface water while stirring. However, such a method has a problem in that it is not possible to improve the DO deficiency in the bottom layer at a deep water position. Therefore, a submerged aeration and agitation method has been proposed in which water in the bottom layer is sucked, discharged and agitated with fine bubbles.

[0004]

However, the DO of the bottom layer is
In order to improve the shortage, the method of directly supplying air to the bottom layer as described above cannot efficiently use the water with high DO in the surface layer, and, for example, mixing of seawater into the bottom layer at the estuary, dams, etc. Like the thermocline in
When a density difference occurs between the surface layer and the lower layer, it is difficult to circulate and mix the surface layer and the lower layer, and the DO improvement range of the bottom layer becomes narrow. In addition, depending on the place and time, the water depth, the DO depth distribution, the height of the density layer, and the flow velocity may change significantly.
There is a problem that the effect of improving DO cannot be practically achieved.

The present invention has been made in consideration of the above-mentioned conventional situation, and it can be moved to a required place in a river or lake, and the surface water can be sent to an arbitrary depth so that the surface water It is an object of the present invention to provide a DO improving apparatus for river water or the like, which can improve DO deficiency in the bottom layer by using water with high DO.

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments.
The hull A, which can be moored freely, is provided with an entrance / exit section 1 that opens into the water, and a suction cylinder 6 of the required height is provided at the suction port 6 at the upper part of the casing 5 equipped with an impeller 9 so that the suctioned water is casing. An underwater agitator B for discharging from the lower part of 5 is provided so as to be adjustable up and down in the water from the entrance / exit section 1.

Further, the DO improvement device according to claim 2 is a moving device,
The hull A, which can be moored freely, is provided with an entrance / exit section 1 that opens into the water, and a suction tube of a required height is provided at an intake port 6 at the top of a casing 5 equipped with an impeller 9 and an air diffusion rotor 25.
10. An underwater agitating and aerating device D, which is provided with 10 and which mixes air with the sucked water and discharges it from the lower part of the casing 5, is provided so as to be adjustable up and down in the water from the entrance / exit section 1. Is.

The DO improving apparatus according to claim 3 is the apparatus according to claim 1 or 2, characterized in that the water absorption height of the water absorption cylinder 10 provided in the casing 5 is variably adjustable. .

[0009]

The present invention is configured as described above, and when the hull A moves, the operating rope 19 is hoisted by the hoisting winch 21 to raise the hoisting rod 12 and the supporting rod 13, and the submersible agitator B (or As shown in FIG. 1, the submerged agitating and aerating device D) is housed in the access section 1. When performing DO improvement work on river water or the like, the operation rope 19 is operated to lower the elevating rod 12. As a result, the support rod 13 also descends along the elevating rod 12, and the underwater stirring device B (or the underwater stirring aeration device D)
It will descend into the water as shown in FIG. The depth positions of the devices B and D in water are freely adjusted by the degree of the length of the operation rope 19 that is extended.

In the submersible agitator B descending into water, the submersible motor 8 is driven to rotate the impeller 9, whereby the water in the surface layer is sucked from the water absorption cylinder 10 and the bottom layer portion from the ejection passages 7 and 7 in the lower portion. The water in the surface layer having a high DO is mixed with the water in the bottom layer, and the DO in the bottom layer is improved.

In the submersible agitator / aerator D, while the submersible motor 8 is driven to rotate the impeller 9, air from a blower (not shown) mounted on the hull A is sent to the air supply pipe 26 and rotated together with the impeller 9. The air is ejected to the air diffuser rotor 25, and the air is finely divided by the rotation of the air diffuser rotor 25. The air is dispersed and mixed in the sucked water, and is discharged together with the water. According to this device D, the aeration treatment of the bottom layer water is added, and the effect of improving DO is further enhanced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, A is a hull, and inside thereof, an entrance / exit section 1 of a stirring device B is provided which penetrates the hull A vertically and is opened in water. Also, hull A
Wire ropes 2 and 2 used for mooring, etc. are wound around mooring winches 3 and 3, and each mooring winch is wound up.
It can be freely moved on the water by the rewinding operation or moored at a desired position. The hull A may be self-propelled. Further, the access section 1 may be provided at the stern, the bow or the outside of the ship.

As shown in FIG. 3, the stirrer B has a bottomed cylindrical casing 5 having a suction port 6 in the upper part and a large number of ejection passages 7, 7 radially in the lower part, and a Motor 8
There is provided an invera 9 which is rotated by. At the upper end of the casing 5, a water absorption cylinder 10 communicating with the suction port 6 and having a required height is erected. This stirring device C is
It is suspended by a lifting device C provided on the hull A, and can be lifted up and down from the entrance / exit section 1 into the water.

The elevating device C includes an elevating rod 12 provided on a guide rod 11 projecting from one side of the entrance / exit section 1 so as to be vertically slidable,
An L-shaped support rod that is vertically moved along the lifting rod 12.
An agitator C is suspended 14 at the upper part of the arm 13a protruding horizontally.

A lower pulley 15 is provided on one lower side of the lifting rod 12,
An upper sub-pulley 17 projecting from the upper main pulley 16 and the lower pulley on the opposite side is provided on the upper part of the same. An operation rope 19 whose one end is fixed to an arm 18 projecting below the guide rod 11 is wound around an elevator winch 21 through an intermediate pulley 20 provided on the hull A from a lower pulley 15 and an elevator winch 21. The raising / lowering rod 12 is raised by the winding operation of the above, and the raising / lowering rod 12 is lowered by the feeding operation. A suspension rope 23 having one end fixed to an arm 22 protruding above the guide rod 11 is fixed to the upper end of the support rod 13 via an upper main pulley 16 and an upper sub pulley 17.

Therefore, if the operating rope 19 is wound by the lifting winch 21 and the lifting rod 12 is lifted, the hanging rope 23
Since the length of the support rod 13 is constant, the support rod 13 is pulled up along the lift rod 12 as the lift rod 12 is lifted.
Then, when the lifting rod 12 is maximally lifted, as shown in FIG. 1, the stirring device B suspended 14 on the support rod 13 can be housed in the entrance / exit section 1. Further, when the operation rope 19 is unrolled and the lifting rod 12 is lowered, the supporting rod 13 is also lowered along with the lifting rod 12 and the lifting rod 12 is also lowered.
When the descent is maximized, as shown in FIG. 2, the support rod 13 on which the stirring device C is suspended 14 reaches the lowermost portion of the elevating rod 12. In this way, the stirrer B can be lowered to the required depth between the storage position shown in FIG. 1 and the deepest position shown in FIG.

When the stirring device B descends into the water, the submersible motor 8 is driven to rotate the impeller 9, and as shown by the arrow in FIG. It flows into the casing 5 through the suction port 6 and is discharged to the surroundings through the lower ejection passages 7, 7. As a result, the surface water with high DO is sent to the bottom layer with low DO, and the DO deficiency can be improved.

As shown in FIG. 4, the stirring device B is provided with an umbrella-shaped jet promoting plate 24 below the jet passages 7 and 7 and projecting outwardly longer than the jet passages 7 and 7. You can In this way, the water jetted from the jet flow paths 7, 7 reaches a long distance along the jet facilitator plate 24, is widely diffused, and scoops up the sediment and deposits in the bottom layer of rivers and lakes. Is prevented.

In the present invention, instead of the agitating device B, an agitating and aerating device D in which a diffusing means is added to the agitating device B can be used. FIG. 5 shows an embodiment of a stirring and aerating device, in which a diffuser rotor 25 which is rotated together with the impeller 9 is provided on the lower bottom portion of the stirring device B, and a blower (which is installed on the hull A) (Not shown) is connected to an air supply pipe 26, and air is dispersed and mixed in the water discharged from the jet flow paths 7, 7. Thereby, the DO improvement by aeration of the bottom layer is promoted. This stirring aeration device D
Is used when the DO of the surface water is low or when the DO of the surface layer is low.
It is suitable when it is insufficient. Incidentally, also in the apparatus of this embodiment, the jet promoting plate 24 can be provided as in the stirring apparatus B shown in FIG.

Further, in the present invention, the water absorption height of the water absorption cylinder 10 can be varied to change the height from the water absorption position to the position of the jet flow. 6 and 7 show an embodiment thereof. That is, the water absorption cylinder 10 is composed of a plurality of cylinders.
The structure is such that 10a to 10d are sequentially expanded and contracted in a nested manner. In this case, the cylindrical body d at the uppermost stage is suspended 32, 32 by the ropes 31, 31 wound around the adjusting winches 30, 30 installed on the hull A, and the stirring device B or the stirring aeration device is provided. At the time of descent and ascent, the ropes 31 and 31 are drawn out and wound up so that they can be followed, and when the devices B and D are stopped at a predetermined water depth, the ropes 31 and 31 are drawn out. By winding, the water absorption cylinder 10 can be freely changed by adjusting its height from a contracted state as shown in FIG. 6 to an expanded state as shown in FIG. be able to.

FIGS. 8 to 11 show the water absorbing cylinder which is expandable and contractible.
10 shows another ten embodiments. In the example of FIG. 8, the water absorption cylinder 10 is formed by a flexible hose, and the rope 31,
It can be bent and stretched by its own weight by feeding and winding 31, and its substantial height can be changed to adjust the water absorption height. In the example of FIG. 9, the water absorption cylinder 10 is formed by a bellows-like expandable hose, and as in the above example, a rope is used.
The actual height, that is, the water absorption height can be changed by the operation of 31, 31. In the example of FIG. 10, a plurality of pipe bodies 27, 27 are connected to each other by flexible joints 28, 28 to form a water absorbing cylinder 10,
The water absorption height can be adjusted in the same manner as above.

Further, in FIG. 11, the water absorption cylinder 10 is inserted into an outer cylinder 29a in which a plurality of water absorption holes 33, 33 are vertically arranged, and an inner cylinder 29b having a vertically long water absorption hole 34 is closed. And rotatably connected to each other, and the operation shaft 35 projecting from the upper end of the inner cylinder 29b is rotated so that the water absorption hole 34 of the inner cylinder 29b is separated from the water absorption holes 33, 33 of the outer cylinder 29a. The height position of water absorption can be changed up and down by matching with either of them.

[0023]

As described above, according to the present invention,
An underwater agitation device is mounted on a hull that can be moved and moored freely, and this can be set at an arbitrary location and water depth, and the surface water can be sent to the required depth for diffusion and agitation. The high water content can improve the DO deficiency of the bottom water. And even in the situation where a difference in density occurs between the surface layer and the lower layer, such as where seawater mixes into the bottom layer at the estuary or in thermocline in dams, etc., by sending surface water with a specific gravity to the lower layer, It is possible to promote mixing of upper layer water and lower layer water, improve DO improvement efficiency, and expand DO improvement range.

Further, since the submerged stirring aerator has both oxygen diffusion function as well as diffusion and stirring functions, even if the DO of the surface water is low, or even if the DO of the surface layer is insufficient, the aeration source from the air source Since aeration and agitation are performed by air supply, the DO of the bottom layer water can be improved.

Further, in the structure in which the water absorption height of the water absorption cylinder is adjustable, it is possible to inhale water of a layer of any depth according to the water depth and quality of water such as a river. It can be used. Furthermore, since the underwater stirring (aeration) device is mounted on a hull that can be moved and moored freely, it is possible to respond to changes in location and time, and also to easily perform emergency evacuation when water comes out.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing a state in which the submersible agitator is lowered.

FIG. 3 is an enlarged vertical sectional view of an underwater agitator.

FIG. 4 is a vertical cross-sectional view showing another embodiment.

FIG. 5 is an enlarged vertical cross-sectional view of an underwater agitating and aerating device.

FIG. 6 is an explanatory view of a usage state of the apparatus of the embodiment provided with a water absorption cylinder having a variable water absorption height.

FIG. 7 is a vertical cross-sectional view showing an embodiment of a water absorption cylinder having a variable water absorption height.

FIG. 8 is a vertical cross-sectional view showing another embodiment.

FIG. 9 is a vertical sectional view showing still another embodiment.

FIG. 10 is a vertical sectional view showing still another embodiment of the present invention.

FIG. 11 is a vertical sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 A Hull B Underwater stirring device C Lifting device D Underwater stirring and aerating device 1 Inlet / outlet section 5 Casing 6 Suction port 7 Jet flow path 8 Submersible motor 9 Impeller 10 Water absorption cylinder 10a, 10b, 10c, 10d Cylindrical body 11 Guide rod 12 Lifting lever 13 Support rod 15 Lower pulley 16 Upper main pulley 17 Upper sub pulley 18 Arm 19 Operation rope 20 Intermediate pulley 21 Lifting winch 22 Arm 23 Suspended rope 24 Jet flow promoting plate 25 Air diffuser rotor 26 Air pipe 27 Pipe 28 Joint 29a Outer cylinder 29b Inner cylinder 33, 34 Water absorption hole 35 Operation shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Iwadai Nakanishi Muromachi 3-1-3 Chuo-ku, Tokyo KUBOTA Tokyo Head Office (72) Inventor Tatsuhiro Ishihara 3-1-3 Nihombashi Muromachi, Chuo-ku, Tokyo Kubota Tokyo Head Office (72) Inventor Yoichiro Hirose 3-1-3 Nihonbashi Muromachi, Chuo-ku, Tokyo Kubota Tokyo Head Office

Claims (3)

[Claims] 1. A hull that can be moved and moored freely is provided with an entrance / exit section that opens into the water, and a suction tube at the required height is provided at the suction port at the top of the casing equipped with an impeller, so that the suctioned water An apparatus for improving DO of river water or the like, characterized in that an underwater agitation device for discharging from the lower part of the casing is provided so as to be vertically adjustable in water from the above-mentioned entrance / exit section. 2. A hull that can be moved and moored is provided with an entrance / exit section that opens into water, and a water absorption cylinder of a required height is provided at an intake port at the top of a casing equipped with an impeller and an air diffusing rotor. An apparatus for improving DO of river water or the like, characterized in that an underwater agitating and aerating device which mixes air with inhaled water and discharges it from the lower part of the casing is provided so as to be adjustable up and down in water from the above-mentioned entrance / exit section. . 3. The DO improving apparatus for river water or the like according to claim 1, wherein the water absorption height of a water absorption cylinder provided in the casing is variably adjustable.