JP6402023B2 - Air lift pump device and method for removing contaminants in water - Google Patents

Description

  The present invention relates to an air lift pump device and a method for removing water pollutant components. More specifically, the present invention relates to an air lift pump device and a method for removing water pollutant components by subdividing the air per spray nozzle injected into the riser pipe of the air lift pump device. The present invention relates to an air lift pump device that can be removed and an underwater contaminant removal method.

  When construction such as excavation of the underwater ground is performed, the surrounding water area is contaminated accordingly. Alternatively, when the ground is excavated on land, contaminated water in which earth and sand or the like are mixed with groundwater may accumulate in the excavation hole. When it is necessary to remove the generated underwater pollutant components in such construction, for example, the underwater pollutant components are removed by sucking the polluted water and water using a pump or the like. In addition, an air lift pump device may be used to remove earth and sand or sludge accumulated on the bottom of the water (see, for example, Patent Documents 1 and 2).

  In the air lift pump device, high-pressure air is injected from the injection nozzle to the lower end portion of the riser pipe. The bottom sediment is excavated by the jetted air, and the excavated sediment is moved upward in the riser pipe by the buoyancy accompanying the expansion of the air bubbles and collected on the water. For example, when removing pollutant components floating in water using an air lift pump device, the air injected to the lower end of the riser pipe is dispersed and subdivided widely within the riser pipe. The pollutant component can be easily moved upward and can be efficiently removed.

  The conventional air lift pump device has not been sufficiently considered to subdivide the air injected from the injection nozzle. For this reason, measures such as increasing the number of spray nozzles are required to improve the removal efficiency of the pollutant components. However, when a large number of injection nozzles are provided, there are problems that the apparatus becomes complicated and the apparatus cost increases.

JP 2004-110839 A JP 2005-306549 A

  An object of the present invention is to provide an air lift pump device and an underwater pollutant component that can efficiently remove water pollutant components by further subdividing the air per jet nozzle that is injected into the riser pipe of the air lift pump device. It is to provide a removal method.

In order to achieve the above object, an air lift pump device according to the present invention is an air lift pump device including a riser pipe arranged in a standing condition in water and an injection nozzle for injecting air to a lower end portion of the riser pipe. A discharge path that is formed inside the riser pipe and communicates with the upper and lower sides, and a pump that sucks upward the contents in the discharge path are provided. It is characterized by providing a porous portion in which a large number of holes for communicating with each other are formed .

In the method for removing underwater pollutant components of the present invention, air is injected from the injection nozzle to the lower end of the riser pipe arranged in a standing state in water, and the buoyancy accompanied by the expansion of air bubbles generated by the injected air In the removal method of underwater pollutant components that move and remove the underwater pollutant components from the lower end of the riser tube through the riser tube, a discharge path that communicates vertically with the interior of the riser tube is formed . Provided on the peripheral wall is a porous portion in which a large number of holes for communicating the outside of the riser pipe and the discharge passage are formed, and the contents in the discharge passage are sucked upward by a pump, and the riser pipe is drawn through the porous portion. The water pollutant component is moved upward through the discharge passage while sucking water into the discharge passage from the outside .

According to the air lift pump device and the method for removing underwater pollutant components of the present invention, the peripheral wall of the riser pipe is provided with a porous portion in which a large number of holes for communicating the outside of the riser pipe and the discharge path are formed, and the discharge path In the discharge passage, the air injected from the injection nozzle is perforated in the discharge passage by sucking the contents in the pump upward by the pump and sucking water into the discharge passage from the outside of the riser pipe through the porous portion. The air is subdivided by merging with the water sucked through the section. As a result, finer air bubbles can be generated in a wider range inside the discharge passage, so that the pollutant components can be efficiently moved upward and removed.

It is explanatory drawing which illustrates the reference example of the air lift pump apparatus of this invention. It is explanatory drawing which illustrates the internal structure of the lower end part of the riser pipe | tube of FIG. It is explanatory drawing which decomposes | disassembles and illustrates the component of the lower end part of the riser pipe | tube of FIG. It is explanatory drawing which illustrates arrangement | positioning of the injection nozzle of FIG. 2 by planar view. It is explanatory drawing which illustrates embodiment of an air lift pump apparatus. It is explanatory drawing which illustrates the internal structure of the lower end part of the riser pipe | tube of FIG. It is explanatory drawing which illustrates the lower end part of the riser pipe | tube of FIG. 5 by a side view.

  Hereinafter, an air lift pump device and a method for removing contaminants in water according to the present invention will be described based on the embodiments shown in the drawings.

1 to 4, an air lift pump device 1 (hereinafter referred to as a pump device 1) according to a reference embodiment of the present invention includes a riser pipe 2 arranged in a standing state in water, and an injection nozzle 7 for injecting air A. And a porous filter 6 disposed inside the riser pipe 2, and a discharge path 5 communicating vertically is formed inside the riser pipe 2. The riser pipe 2 is suspended in water by a crane or the like.

  For example, the riser pipe 2 is set to a required length by connecting a plurality of circular pipe bodies 2A, 2B, 2C in the longitudinal direction. In this embodiment, the riser pipe 2 is formed by connecting three circular pipe bodies 2A, 2B, 2C. The lowermost circular tube body 2 </ b> A includes an outer tube 3 and an inner tube 4 embedded in the lower end portion of the outer tube 3 in the middle in the longitudinal direction. The outer tube 3 constituting the circular tubular body 2A is composed of a lower portion 3A and an upper portion 3B into which the lower portion 3A is fitted.

  The injection nozzle 7 is connected to a compressor 9 installed on the ground via an air supply line 8. The injection port 7 a of the injection nozzle 7 is opened in the peripheral wall of the outer tube 3. The injection nozzle 7 injects high-pressure air A, which is pumped from the compressor 9 through the air supply line 8, into the lower end portion of the riser pipe 2 from the injection port 7 a.

  Although a single injection port 7a may be provided, a plurality of injection ports 7a are preferably provided. In the case of a plurality of injection ports 7a, the injection ports 7a may be arranged at intervals in the circumferential direction. The plurality of injection ports 7a are more preferably arranged at equal intervals in the circumferential direction. In this embodiment, as illustrated in FIG. 4, the injection direction of the air A from the injection port 7 a is set in a direction that generates a swirling flow with respect to the tube axis center of the riser tube 2 inside the riser tube 2. Yes.

  The porous filter 6 is disposed above the injection port 7 a and is interposed between the injection port 7 a and the discharge path 5. In this embodiment, the porous filter 6 is a cylindrical body. The porous filter 6 is disposed along the inner peripheral surface of the outer tube 3 with the lower end of the porous filter 6 fitted between the inner peripheral surface of the outer tube 3 and the outer peripheral surface of the inner tube 4. .

  More specifically, the outer peripheral portion of the lower end surface of the porous filter 6 abuts on the annular support protrusion 3c protruding from the inner peripheral surface of the lower portion 3A of the outer tube 3 to the inner peripheral side, and the porous filter 6 is mounted. Is placed. The upper end surface of the porous filter 6 is pressed by an annular presser lid 3d that protrudes from the inner peripheral surface of the upper portion 3B of the outer tube 3 toward the inner peripheral side.

  The porous filter 6 is a member in which a large number of minute holes 6a are formed. For example, porous ceramics or metal can be used. Or the hard resin etc. in which many open cells were formed as the hole 6a can be used. The size of the hole 6a is, for example, 0.01 mm to 5 mm. The size (inner diameter, outer diameter, length) of the porous filter 6 is determined based on the required amount of air bubbles B described later.

  The inner space of the inner tube 4, the inner space of the cylindrical porous filter 6, and the inner spaces of the circular pipe bodies 2 </ b> A, 2 </ b> B, and 2 </ b> C connected to the upper side form a discharge path 5.

Below, the removal method of the underwater pollutant component using this pump apparatus 1 is demonstrated.

  As illustrated in FIG. 1, the riser pipe 2 of the pump device 1 is installed in a standing state in water, and the lower end opening thereof is disposed at an upper position away from the water bottom ground. And the lower end opening is set in the range where the pollutant component D (earth and sand, silt content, etc.) to be removed is floating or in the vicinity thereof.

  Next, air A is sprayed to the lower end portion of the riser pipe 2 by the spray nozzle 7. The injection pressure of air A is the same as that of the conventional air lift pump device. The air A injected from the injection port 7 a is first injected into the gap between the inner peripheral surface of the outer tube 3 and the outer peripheral surface of the inner tube 4 formed below the porous filter 6. Thereafter, the gas is supplied to the discharge path 5 through the porous filter 6.

As illustrated in FIG. 2, the air A is subdivided by passing through the porous filter 6, and finer air bubbles B are generated inside the discharge path 5. As the air bubble B moves upward, the air bubble B expands and becomes larger as the acting water pressure decreases. If the air valve B is excessive, the pollutant component D contained in the polluted water falls from the gap between the air bubble B and the air valve B, so that it is difficult to move upward. However, in this reference embodiment , the air bubbles B become minute and the number thereof increases as compared with the conventional device in which the air A does not pass through the porous filter 6.

Therefore, in this embodiment , the gap between the air bubble B and the air bubble B is extremely small. Therefore, it is possible to efficiently move and remove the pollutant component D from the lower end portion of the riser pipe 2 through the discharge path 5 by the buoyancy accompanying the expansion of the minute air bubbles B. That is, in this embodiment , the air A injected from one of the injection nozzles 7 can be further subdivided as compared with the conventional case. Therefore, in the present invention, the air A can be subdivided without providing a large number of injection nozzles 7, and the complication of the pump device 1 can be avoided. The pollutant component D moved upward is transferred to another place on the water by the transport device.

Further, in this reference embodiment , since the cylindrical porous filter 6 is used, minute air bubbles B are moved from the entire inner peripheral surface of the porous filter 6 (that is, the entire outer peripheral surface of the discharge passage 5) to the inside of the discharge passage 5. Supplied. For this reason, minute air bubbles B are generated at a high density in a wide area inside the discharge passage 5, and it is more and more advantageous to efficiently move the pollutant component D up and down.

  Although the injection direction of the air A from the injection port 7a can be set arbitrarily, it may be set in a direction in which a swirling flow is generated in the riser pipe 2 with respect to the tube axis center of the riser pipe 2. With this setting, it is easy to generate minute air bubbles B in a wide area inside the discharge path 5, and the pollutant component D can be moved and removed more efficiently.

In the reference embodiment described above, the injection nozzle 7 and the porous filter 6 are provided only at the lower end portion of the riser pipe 2, but the injection nozzle 7 and the porous filter 6 are provided at a plurality of positions spaced apart in the vertical direction of the riser pipe 2, respectively. Can be installed in the same way. For example, when the riser pipe 2 is long (for example, 20 m or more), such a configuration makes it easy to smoothly move the pollutant component D onto the water.

The embodiment of the pump device 1 illustrated in FIG. 5 to FIG. 7 includes the pump 10 with respect to the previous reference form , and the specifications of the riser pipe 2 are different, and the other configurations are the same. The pump 10 is installed on the ground, and the upper end portion of the riser pipe 2 is connected thereto. The pump 10 functions so as to suck upward the stored matter such as the polluted water containing the pollutant component D existing in the discharge path 5.

  The peripheral wall at the lower end of the riser tube 2 (outer tube 3) is provided with a porous portion 3a in which a large number of holes 3b for communicating the outside of the riser tube 2 (outer tube 3) and the discharge passage 5 are formed. The size of the hole 3b is, for example, 0.1 mm to 5 mm. The holes 3b are preferably formed uniformly in the circumferential direction of the outer tube 3. A part of the outer tube 3 may be made of a mesh material, and a mesh portion may be provided as a hole 3b with a porous portion 3a. In this embodiment, the pump 10 is indispensable, but the porous filter 6 can be arbitrarily provided as necessary.

  Below, the removal method of the underwater pollution component of this invention using this pump apparatus 1 is demonstrated.

The setting of the pump device 1 is the same as in the previous reference embodiment . Next, air A is sprayed to the lower end portion of the riser pipe 2 by the spray nozzle 7. The injection pressure of air A is the same as that of the conventional air lift pump device. The air A injected from the injection port 7 a is supplied to the discharge path 5 through the porous filter 6. Further, by operating the pump 10, the inside of the discharge path 5 is sucked upward by the pump 10.

  As illustrated in FIG. 6, the air A is subdivided by passing through the porous filter 6, and a large number of minute air bubbles B are generated inside the discharge path 5. Furthermore, in this embodiment, since the inside of the discharge path 5 is sucked upward by the pump 10, water W is sucked into the discharge path 5 from the outside of the outer tube 3 through the porous portion 3a. Inside the discharge path 5, the air A jetted from the jet nozzle 7 merges with the water W sucked through the porous portion 3a.

  Since the water W that has passed through the minute porous portion 3a has a relatively high flow velocity compared to the surrounding water W, the air A (air bubble B) is further subdivided by merging (collision) with the water W. . Therefore, the finer air bubbles B can be generated in a wider range inside the discharge path 5. Therefore, it becomes more and more advantageous to efficiently remove and remove the pollutant component D upward.

  As described above, the air A jetted from the jet nozzle 7 joins and collides with the water W sucked through the porous portion 3a and is further subdivided. Therefore, even if the air A injected from the injection nozzle 7 does not pass through the porous filter 6 and is subdivided, the minute air valve B can be generated as compared with the conventional apparatus. Therefore, depending on the situation of the construction site, the porous filter 6 can be omitted.

Various configurations described in the above reference embodiment can also be adopted in this embodiment. For example, the porous portion 3a can be provided at a plurality of positions spaced apart in the vertical direction of the riser tube 2. In the previous embodiment as well, a porous portion 3a in which a large number of the above-described holes 3b are formed on the peripheral wall of the riser pipe 2 can be provided.

  The present invention can be used, for example, for construction for excavating the ground to construct an underground wall. In the case of this construction, dirt water etc. are mixed with ground water in the excavation hole, and polluted water is collected. A concrete wall is formed by placing concrete in this excavation hole and then placing concrete. At this time, if polluted water remains in the excavation hole, the pollutant component adversely affects the quality of the concrete. Therefore, so-called slime treatment is performed to remove the polluted water. The present invention can be applied to this slime treatment.

  The present invention is not limited to the slime treatment described above, and can be applied to other cases where contaminated water, earth and sand, etc. in water such as the sea are removed. When removing the pollutant component D in the sea, the pump device 1 is mounted on a work ship or the like, and the riser pipe 2 is suspended from the work ship or the like in the water.

DESCRIPTION OF SYMBOLS 1 Air lift pump apparatus 2 Riser pipe | tube 2A, 2B, 2C Circular pipe body 3 (3A, 3B) Outer pipe | tube 3a Porous part 3b Hole 3c Support protrusion 3d Holding lid 4 Inner pipe | tube 5 Discharge path 6 Porous filter 6a Hole 7 Injection nozzle 7a Injection Port 8 Air supply line 9 Compressor 10 Pump A Air B Air bubble D Pollution component W Water

Claims (7)

In an air lift pump device comprising a riser pipe arranged in an upright state in water and an injection nozzle for injecting air to the lower end of the riser pipe,
A discharge path that is formed inside the riser pipe and communicates with the upper and lower sides, and a pump that sucks upward the contents in the discharge path are provided, and the outer wall of the riser pipe and the discharge path are provided on a peripheral wall of the riser pipe. An air lift pump device comprising a porous portion in which a large number of holes communicating with each other are formed. The air lift pump device according to claim 1 , wherein a porous filter disposed inside the riser pipe is provided, and the air jetted from the jet nozzle is supplied to the discharge passage through the porous filter. 3. The air lift pump device according to claim 2 , wherein the porous filter is a cylindrical body disposed along the inner peripheral surface of the riser pipe at a position above the injection port of the injection nozzle. The riser pipe is composed of an outer pipe and an inner pipe embedded halfway in the longitudinal direction inside the lower end portion of the outer pipe, and the lower end portion of the porous filter is an inner peripheral surface and an inner pipe of the outer pipe. of fit is between the outer peripheral surface, wherein the porous filter is disposed along the inner peripheral surface of the outer tube, the injection port of the injection nozzle according to claim 3 which is open on the peripheral wall of the outer tube Air lift pump device. The air lift pump device according to any one of claims 1 to 4 , wherein a plurality of injection ports of the injection nozzle are arranged at intervals in the circumferential direction with respect to the riser pipe. Air is injected from the injection nozzle to the lower end portion of the riser pipe placed in a standing state in the water, and the buoyancy accompanied by the expansion of the air bubbles caused by the injected air causes the lower end portion of the riser pipe to pass through the riser pipe. In the removal method of underwater pollutant that removes the underwater pollutant by moving upward,
A discharge path that communicates vertically with the interior of the riser pipe is formed, and a perforated portion in which a large number of holes are formed in the peripheral wall of the riser pipe to communicate the outside of the riser pipe with the discharge path. The water contained in the water is sucked upward by a pump, and the water pollutant component is moved upward through the discharge passage while sucking water into the discharge passage from the outside of the riser pipe through the porous portion. Method for removing pollutant components. The removal method of the underwater pollutant component of Claim 6 which provides the porous filter arrange | positioned inside the said riser pipe | tube, and supplies the air injected from the said injection nozzle to the said discharge path through the said porous filter.

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