JP3809345B2 - Sludge recovery equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sludge recovery device that efficiently recovers sludge accumulated on the bottom of lakes, ponds, dam lakes, and the like.
[0002]
[Prior art]
Conventionally, as this type of device, for example, “underwater mud dredging device” described in JP 2000-257108 A and “dredging device” described in JP 9-184163 A are known.
The underwater mud dredging device in the former gazette is a cylindrical shielding cylinder with an open bottom surface that blocks the surroundings, and jets high-pressure water from a nozzle installed in the shielding cylinder and accumulates on the bottom of the water. The agitated mud is agitated in the shielding cylinder, and the water in the shielding cylinder is sucked together with the mud with a vacuum pump and collected by the transfer machine. It has the effect of efficiently recovering mud without turbidity.
[0003]
In addition, the dredging device of the latter publication has a rotating mud collecting blade installed on the bottom of the water, and the rotating mud collecting blade is rotated by high-pressure air to scoop up the sludge accumulated on the bottom of the water, and the rotating mud collecting blade lifts up. The sludge accumulated on the bottom of the water is recovered by pumping the sludge to the land using high-pressure air.
[0004]
[Problems to be solved by the invention]
However, in the former underwater mud dredging device, the structure of the mud mud that can be stirred is limited to the vicinity of the nozzle because of the structure that jets high pressure water to the mud deposited on the bottom of the water from the nozzle installed in the shielding cylinder and stirs the mud. And extensive stirring is difficult.
For this reason, in order to increase the collection efficiency by increasing the size of the shielding cylinder, it is necessary to install a large number of nozzles in the shielding cylinder. When the nozzle is installed, the weight of the shielding cylinder increases, and there is a problem that mobility is impaired.
In addition to a high-pressure pump that ejects high-pressure water, a vacuum pump that sucks and collects the muddy water stirred in the shielding cylinder together with water is also required, which makes the dredge apparatus complicated and expensive, and consumes it. Since electric power also increases, there are problems such as an increase in mud collection cost.
[0005]
On the other hand, in the dredging device of the latter publication, when the rotating mud collecting blade installed in the water is rotated by air pressure, it receives both the sludge resistance and the water resistance. When the dredging device becomes large and expensive, and if dust or pebbles are caught in the rotating mud collecting blades, the rotating mud collecting blades are stopped and sludge cannot be collected. There is a problem that it cannot be used for many bottoms.
[0006]
The present invention has been made to improve such conventional problems, and an object of the present invention is to provide a sludge recovery device that can efficiently recover sludge accumulated on the bottom of the water without polluting surrounding water. is there.
[0007]
In order to achieve the above object, the sludge recovery apparatus of the present invention includes a closed tank having a lower surface provided with a water inlet at a part of a side surface and a sludge inlet at a position away from the water inlet, and the water inlet. And the sludge suction port are divided in the closed tank and the water sucked from the water suction port side is accelerated to form a water flow. Rectifying means installed so as to be inclined with respect to the side surface of the closed tank so that the mouth side is narrowed, and closed tank moving means for introducing the closed tank into the bottom of the sludge and moving along the bottom of the water The sludge suction means is installed in the closed tank moving means and the sludge in the closed tank is sucked together with water from the sludge suction port.
[0008]
With the above configuration, since the soft sludge accumulated on the bottom of the water can be agitated by the water flow formed in the closed tank and sucked with the water by the sludge suction means, the sludge on the bottom of the water can be removed without polluting the surrounding water. The sludge is guided to the sludge suction port while stirring the sludge using the water flow formed in the closed tank by the rectifying means as well as being able to recover efficiently. Compared with the conventional one that ejects and stirs sludge, it can efficiently stir a wide area in the closed tank and does not require a high-pressure pump that generates high water pressure, so a sludge recovery device can be obtained at low cost .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram of a sludge recovery device, FIG. 2 is a perspective view of a closed tank constituting the sludge recovery device, and FIG. 3 is a bottom view thereof.
The sludge recovery device includes a closed tank 1 that sucks sludge that has been put into the bottom of the water and deposited on the bottom of the water, a closed tank moving means 2 that moves up and down the closed tank 1 and floats on the surface of the sludge recovery water area, and a closed tank. 1 is constituted by sludge collecting means 3 for separating and collecting sludge sucked together with water from water.
[0018]
As shown in FIG. 2, the closed tank 1 has a flat box-like structure, the lower surface is opened, and a water inlet 1a is opened at a part of the side surface.
A screen 4 having a mesh opening of 1 to 10 cm formed by a wire mesh or the like is attached to the lower surface opening of the closed tank 1 and the water suction port 1a, so that dust, pebbles and the like are sucked into the closed tank 1. In addition to blocking, as shown in FIG. 3, the water sucked from the water inlet 1 a is accelerated in the closed tank 1 to form a water flow in the direction of the sludge inlet 1 b provided on the upper surface of the closed tank 1. A plate-like rectifying means 1c is installed.
The rectifying means 1c is provided so as to divide between the water inlet 1a and the sludge inlet 1b, and accelerates the water sucked from the water inlet 1a to form a water flow. Therefore, the water inlet 1a side is wide, And it is installed so that it may incline with respect to the side plate 1d of the closed tank 1 so that the front end side becomes narrow, and the ratio of the opening area on the water inlet 1a side and the opening area of the narrowest part is about 500 to 600 times. The height of the side plate 1d and the rectifying means 1c of the closed tank 1 is set to about 50 cm so that soft sludge having a deposition depth of several tens of cm deposited on the bottom of the water can be efficiently recovered.
[0019]
On the other hand, in the closed tank moving means 2 made of a floating body that floats on the water surface, a winding means 5 such as a winch that moves up and down to put the closed tank 1 into the bottom of the water or lift it from the bottom of the water, and sludge in the closed tank 1 are watered. In addition, a sludge suction means 6 comprising a pump for suction is installed.
The corner of the closing tank 1 is bound to the tip of the rope 7 suspended from the winding means 5, and the closing tank 1 is pulled along the bottom of the water by the winding means 5 while the closing tank 1 is kept horizontal. Between the sludge suction port 1b provided on the upper surface of the closed tank 1 and the sludge suction means 6 installed on the floating body 2, a suction pipe 8 made of a flexible pipe such as a hose is provided. It is connected.
[0020]
Further, a sludge collecting means 3 having a tank structure made of a floating body is levitated in the vicinity of the water surface where the closed tank moving means 2 is levitated, and the sludge sucked together with water by the sludge sucking means 6 is collected. ing.
In the sludge collecting means 3, a separating means 10 for separating water and sludge from a mixture of sludge and water discharged from the sludge suction means 7 through the discharge pipe 9 is provided in the vicinity of the discharge port of the discharge pipe 9. .
The separation means 10 is formed of, for example, a filter having an opening of 10 to 100 μm, and collects the sludge separated from the water into the sludge collection tank 3a, and the water passing through the separation means 10 is discharged to the water surface. It has become.
In FIG. 1, reference numeral 12 denotes a float that adds sufficient buoyancy to the sludge collecting means 3.
Moreover, the rectification | straightening means 1c which forms a water flow in the obstruction | occlusion tank 1 is provided spirally in the obstruction | occlusion tank 1, as shown in FIG. 4, so that a water flow may be formed helically from the water inlet 1a toward the sludge inlet 1b. It may be.
[0021]
Next, the operation of the sludge recovery apparatus configured as described above will be described.
The lower layer of sludge accumulated for many years on the bottom of the water is hardened, and it is unlikely to cause water pollution, but the soft sludge deposited in layers of several tens of centimeters on this hardened lower layer sludge moves on the water. The sludge recovery device of the present invention is mainly intended to efficiently recover the soft sludge deposited on the bottom of the water several tens of centimeters because it is wound up by a ship or a fish that lives in the water and causes water pollution. .
In the collection of sludge, the closed tank 1 is lowered from the closed tank moving means 2 floated in the sludge collection water area, and put into the bottom of the water as shown in FIG.
The height of the closed tank 1 is set to about 50 cm corresponding to the depth of the sludge to be recovered being several tens of cm. Therefore, the height between the upper surface of the closed tank 1 put into the water bottom and the sludge surface is set. There is almost no gap at the boundary.
[0022]
Next, when the sludge suction means 6 installed on the closed tank moving means 2 is started in this state and the suction of the water in the closed tank 1 is started, the surrounding water is put into the closed tank 1 from the water inlet 1a together with the sludge. Inhaled.
Since the block tank 1 is provided with a rectifying means 1c for accelerating the water sucked from the water suction port 1a to form a water flow, the water sucked into the block tank 1 absorbs sludge while increasing the flow velocity. As shown by the arrow in FIG. 3, the sludge taken into the closed tank 1 from the opening on the lower surface of the closed tank 1 is sucked into the sludge intake port 1b together with water while being stirred by the water flow. It is sucked into the sludge suction means 6 through the suction pipe 8 from the suction port 1b.
As a result, the sludge taken into the closed tank 1 is sucked by the sludge suction means 6 in a short time and discharged to the sludge recovery means 3, and the mixture of water and sludge discharged to the sludge recovery means 3 is separated. Water and sludge are separated by the means 10 and the water is discharged to the water surface, and only the sludge is stored in the sludge collection tank 3a of the sludge collection means 3.
[0023]
On the other hand, when most of the sludge taken into the closed tank 1 is recovered, the amount of sludge in the water discharged from the sludge suction means 6 decreases and the color of the water changes. When it is determined that the collection of the sludge in the tank 1 is completed, the closed tank 1 is moved to the next sludge collection place while the closed tank moving means 2 pulls the closed tank 1 along the bottom of the water, and then returns to the bottom of the water again. The closed tank 1 is stopped and the above operation is repeated. A water flow is formed in the closed tank 1, and the sludge is sucked together with the water while stirring the sludge in the closed tank 1 with this water flow. It becomes possible to efficiently recover soft sludge from the bottom without polluting.
[0024]
FIG. 5 shows a modified example of the closed tank 1, and in this modified example, a skirt 13 formed of a flexible plate such as a rubber sheet is attached to the entire periphery of the lower surface opening at the lower part of the closed tank 1.
Even if there are obstacles such as undulations or stones on the bottom of the water from which the sludge is collected, the skirt 13 is deformed according to the undulations or obstacles of the bottom of the water, and no gap is generated between the bottom surface of the closed tank 1 and the bottom of the water. Therefore, sludge in the closed tank 1 can be reliably recovered regardless of the undulations and obstacles at the bottom of the water.
FIG. 6 shows a modified example in which the sludge suction means 6 comprising a submersible pump is installed directly in the closed tank 1 and the sludge in the closed tank 1 is sucked by the sludge sucked means 6. According to this, the soft sludge deposited on the deep water bottom can be efficiently recovered.
[0025]
In the embodiment and the modification described above, it is effective for sludge recovery in a wide water area such as a lake or a dam lake. However, in a relatively narrow water area, a mixture of water and sludge sucked by the sludge suction means 6 is directly landed. If the water and the sludge are separated and processed on land, the sludge collecting means 3 floating near the blockage tank moving means 2 becomes unnecessary.
For sludge recovery in narrow water areas such as ponds and drainage channels, lifting means such as cranes are installed around the ponds and drainage channels, and the closed tank 1 is thrown into the bottom of the water such as ponds and drainage channels. In this case, the closed tank moving means 2 for moving the closed tank 1 up and down and moving it becomes unnecessary.
[0026]
Further, in order to facilitate movement to the sludge collection place, the closed tank 1, closed tank moving means 2, sludge collection means 3 may be prefabricated to a size that can be transported by loading on a vehicle or the like. When the sludge bag for storing sludge is set in advance in 3 and the sludge bag is filled with the collected sludge, the sludge collecting means 3 is placed on the shore and the sludge bag is landed and collected. Good.
[0027]
【The invention's effect】
As described in detail above, the present invention has a closed tank in which a water suction port is provided on a part of a side surface and a lower surface provided with a sludge suction port at a position away from the water suction port, a water suction port, and the sludge suction port. In order to accelerate the water sucked from the water inlet side to form a water flow, the water inlet side is wide and the sludge inlet side is narrow so Rectifying means installed so as to be inclined with respect to the side surface, closed tank moving means for introducing the closed tank into the bottom of the sludge and moving along the bottom, and closed tank moving means installed and closed Since the sludge in the tank is composed of the sludge suction means that sucks the sludge together with the water from the sludge suction port, the sludge accumulated on the bottom of the water is stirred by the water flow formed in the closed tank and sucked with the water by the sludge suction means. Because you can The sludge at the bottom of the water can be efficiently recovered without polluting the water, and the sludge is guided to the sludge inlet while stirring the sludge using the water flow formed in the closed tank by the rectifier. As a result, it is possible to efficiently stir a wide range in the closed tank compared to the conventional one in which sludge is stirred by ejecting high water pressure from a nozzle, and a high pressure pump that generates high water pressure is not required. The sludge recovery device can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a sludge recovery apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view of a closed tank constituting the sludge recovery apparatus according to the embodiment of the present invention.
FIG. 3 is a bottom view of a closed tank constituting the sludge recovery apparatus according to the embodiment of the present invention.
FIG. 4 is a bottom view showing a modified example of the closed tank constituting the sludge recovery apparatus according to the embodiment of the present invention.
FIG. 5 is a perspective view showing a modified example of the closed tank constituting the sludge recovery apparatus according to the embodiment of the present invention.
FIG. 6 is an overall configuration diagram showing a modified example of the sludge recovery apparatus according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blocking tank 1a Water inlet 1b Sludge inlet 1c Rectification means 2 Blocking tank moving means 3 Sludge collection means 4 Screen 6 Sludge suction means 10 Separation means 13 Skirt

Claims (1)

A water inlet in a part of the side surface, a closed tank having a lower surface provided with a sludge inlet at a position away from the water inlet, and a partition between the water inlet and the sludge inlet. In order to accelerate the water sucked from the suction port side and form a water flow provided in the blockage tank, the water suction side is wide and the sludge suction port side is narrow with respect to the side surface of the blockage tank. Rectifying means installed to be inclined, closed block moving means for introducing the closed tank into the bottom of the sludge and moving along the bottom , installed in the closed tank moving means, and the closed tank A sludge recovery device comprising a sludge suction means for sucking the sludge in the inside together with water from the sludge suction port.

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