JP2011230009A - Magnetic separator and ship installed on the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic separator capable of equalizing the amount of treated water flowing out from a treated water spill edge formed on both sides of a separation tank of the magnetic separator even when a moving body rocks, in the magnetic separator used by being installed on the rocking moving body such as a ship.SOLUTION: The magnetic separator includes: a separation tank 2 into which raw water containing magnetic flocks is introduced via an introduction part 21; and a plurality of magnetic disks 3 which are arranged side-by-side at a spacing by interposing spacers 4a at a rotary shaft 4 provided in the separation tank 2 and attract the magnetic flocks by magnetic force. An outer water tank 1 for stagnating the treated water discharged from the separation tank 2 is provided at a water level higher than the position of a treated water spill edge 22 formed on the both sides of the separation tank 2. A flow resistance plate 6 is provided at a treated water spill part 5 of the outer water tank 1.

Description

  The present invention relates to a magnetic separation device and a ship equipped with the magnetic separation device, and more particularly to a magnetic separation device that is used by being mounted on a swinging moving body such as a ship. The present invention relates to a magnetic separation device that equalizes the amount of treated water flowing out from the treated water outflow edges formed on both sides of a separation tank of the device, and a ship equipped with this magnetic separation device.

Magnetic separation devices have been proposed and put into practical use as devices for removing pollutants present in raw water such as sewage, factory effluent and ship effluent.
In this magnetic separation device, flocculant and magnetic powder are added to raw water to form pollutants as magnetic flocs with magnetism, and these magnetic flocs are attracted to a magnetic disk with magnets to separate and remove them. This separation method is called the mag seed method.

As shown in FIG. 4, the conventional magnetic separation apparatus A ′ includes a separation tank 2 into which raw water containing magnetic floc is introduced via an introduction unit 21, and a rotation disposed in the separation tank 2. By interposing a spacer 4a on the shaft 4, a plurality of magnetic disks 3 which are arranged in parallel at intervals and attract magnetic flocks by magnetic force are provided.
Then, the treated water from which the magnetic floc is adsorbed and removed by the magnetic disk 3 flows out by overflowing from the treated water outflow edge 22 constituting the square weir formed on both sides of the separation tank 2, and the outside of the separation tank 2. It is made to discharge | emit out of the system through the outer side water tank 10 provided in this.

By the way, in recent years, problems have been pointed out that marine wastewater, in particular, aquatic organisms contained in ballast water affect the ecosystem as an alien species, and countermeasures for this have been studied from various aspects (for example, patent documents). 1).
For example, in a ballast water treatment apparatus mounted on a ship shown in FIG. 5, it has been studied to incorporate a magnetic separation device in order to perform pretreatment and / or posttreatment of ballast water.

However, the magnetic separation device mounted on the ship naturally swings in the same manner as the ship swings.
The amount of treated water flowing out by overflowing from the treated water outflow edge 22 formed on both sides of the separation tank 2 of the magnetic separation apparatus A ′ is proportional to the 3/2 power of the overflow water depth h. When the tank 2 tilts, the overflow water depth h fluctuates. As a result, the amount of treated water flowing out from the treated water outflow edges 22 formed on both sides of the separation tank 2 becomes uneven. As a result, the magnetic disk 3 There was a problem that the amount of water flowing between them became uneven, and the magnetic floc adsorption and removal performance by the magnetic disk 3 was adversely affected.

  In addition, in the ship, although the structure which attenuates rocking | fluctuation of ship itself is proposed (for example, refer patent document 2 and 3), there existed a problem that a structure became large.

JP 2009-67253 A JP 2007-38780 A Japanese Patent Laid-Open No. 3-96496

  In view of the problems of the magnetic separation device, the present invention is a magnetic separation device that is mounted and used on a movable body that swings, such as a ship. It is an object of the present invention to provide a magnetic separation device capable of equalizing the amount of treated water flowing out from the treated water outflow edges formed on both sides, and a ship equipped with the magnetic separation device.

  In order to achieve the above object, a magnetic separation device according to the first aspect of the present invention is a magnetic separation device mounted on a swinging moving body such as a ship, wherein a separation tank into which raw water containing magnetic flock is introduced, In a magnetic separation apparatus including a plurality of magnetic disks that are arranged in parallel with a rotation shaft disposed in the separation tank and that attracts the magnetic flocs by magnetic force, the magnetic separation apparatus is formed on both sides of the separation tank. An outer water tank that retains the treated water discharged from the separation tank at a level higher than the position of the treated water outflow edge is provided, and the treated water flow rate discharged from the treated water outflow part of the outer water tank and the introduction of the separation tank are unit time. The raw water flow rate introduced from the section is balanced.

  In order to achieve the same object, the magnetic separation device of the second invention is a magnetic separation device mounted on a swinging moving body such as a ship, and a separation tank into which raw water containing a magnetic flock is introduced. In a magnetic separation apparatus comprising a plurality of magnetic disks that are arranged in parallel with a rotation axis disposed in the separation tank and that adsorb the magnetic flocs by magnetic force, on both sides of the separation tank By providing an outer water tank that retains the treated water discharged from the separation tank at a level higher than the position of the formed treated water outflow edge, and disposing a flowing water resistance plate at the treated water outflow portion of the outer water tank, the separation tank The amount of treated water flowing out from the treated water outflow edge formed on both sides of the water is made equal on both sides.

  Moreover, the ship of this invention concerns on the ship carrying the magnetic separation apparatus of the said this 1st invention or this 2nd invention.

According to the magnetic separation device of the first and second inventions and a ship equipped with these magnetic separation devices, when the magnetic separation device is mounted and used on a swinging moving body such as a ship, The amount of treated water discharged from the treated water outflow part of the outer water tank on both sides of the separation tank of the magnetic separation device due to the tilting of the outer water tank and the separation tank due to rocking, that is, formed on both sides of the separation tank of the magnetic separation device. The rate of fluctuation of the amount of treated water flowing out from the treated water outflow edge is kept low, and the amount of water flowing between the magnetic disks is thereby kept within an acceptable range in terms of processing performance of the magnetic disk, and is made substantially uniform. Therefore, the magnetic floc adsorption and removal performance by the magnetic disk can be maintained within a certain range.
In particular, the aquatic organisms contained in the ballast water can contribute to solving the problem of affecting the ecosystem as an alien species.

  In particular, by disposing the flow resistance plate in the treated water outflow portion, the amount of treated water flowing out from the treated water outflow edge formed on both sides of the separation tank can be further equalized.

1 shows an embodiment of a magnetic separation device of the present invention, (a) is a front sectional view, (b) is an end view taken along line XX of (a), and (c) is an explanatory view of a treated water outflow portion of an outer water tank. is there. It is a top view of the treated water outflow part of an outside water tank. It is a conceptual diagram which shows the variation | change_quantity of water depth and effluent water amount. It is sectional drawing which shows the conventional magnetic separation apparatus. It is explanatory drawing of the ship carrying a ballast water treatment apparatus.

  Embodiments of a magnetic separation device of the present invention and a ship equipped with these magnetic separation devices will be described below with reference to the drawings.

1 to 2 show an embodiment of the magnetic separation device of the present invention.
This magnetic separation apparatus A has a separation tank 2 into which raw water containing magnetic floc is introduced through an introduction part 21 and a rotating shaft 4 disposed in the separation tank 2 by interposing a spacer 4a. In the magnetic separation apparatus provided with a plurality of magnetic disks 3 arranged in parallel at intervals and attracting magnetic flocs by magnetic force, the position is higher than the position of the treated water outflow edge 22 formed on both sides of the separation tank 2. An outer water tank 1 that retains the treated water discharged from the separation tank 2 at the water level is provided, and a flow resistance plate 6 is disposed in the treated water outflow portion 5 of the outer water tank 1, thereby forming the water tanks on both sides of the separation tank 2. The amount of treated water flowing out from the treated water outflow edge 22 is equalized.
Here, the treated water flow rate per unit time discharged from the treated water outflow part 5 of the outer water tank 1 and the raw water flow rate per unit time introduced from the introduction part 21 of the separation tank 2 are balanced.

Thus, when the magnetic separation device A is used by being mounted on a swinging moving body such as a ship, more specifically, for example, when used as a ballast water treatment device mounted on a ship shown in FIG. Further, the amount of treated water discharged from the treated water outflow portion 5 of the outer water tank 1 on both sides of the separation tank 2 of the magnetic separation device A due to the inclination of the outer water tank 1 and the separation tank 2 by the swinging of the moving body, that is, The fluctuation rate of the amount of treated water flowing out from the treated water outflow edge 22 formed on both sides of the separation tank 2 of the magnetic separation apparatus A is suppressed to be low, and thereby the amount of water flowing between the magnetic disks 3 is reduced. In terms of processing performance, it can be made substantially uniform within an allowable range, and the magnetic floc adsorption and removal performance by the magnetic disk 3 can be maintained within a certain range.
In recent years, it has been pointed out that marine wastewater, particularly aquatic organisms contained in ballast water, affects the ecosystem as an alien species. Pretreatment of this ballast water (treatment when introduced as ballast water) And by using this magnetic separation apparatus A for a post-process (process at the time of discharging | emitting ballast water), it can contribute to the solution of this problem.
Further, by providing the flow resistance plate 6, foreign materials that could not be removed at the position up to the magnetic disk 3, such as seagrass, seafood, garbage, etc. contained in seawater introduced as ballast water, are removed. Can be captured and removed.

In this case, the inner peripheral surface of the separation tank 2 is curved and formed with a curved surface (cylindrical surface) along the outer peripheral surface of the magnetic disk 3, and the inner peripheral surface of the separation tank 2 and the outer peripheral surface of the magnetic disk 3 are formed. In the meantime, for example, a gap of about several mm to 10 mm is formed, and in this embodiment, a gap of about 5 mm is formed.
As a result, the magnetic disk 3 can be rotated smoothly, and the raw water containing the magnetic floc is prevented from flowing out directly from the gap between the inner peripheral surface of the separation tank 2 and the outer peripheral surface of the magnetic disk 3, The magnetic floc contained in the raw water is surely attracted and removed by the magnetic disk 3.

Moreover, the flowing water resistance plate 6 can be made of a punching metal.
Thereby, the value of the flow resistance of the flow resistance plate 6 can be arbitrarily set.
In addition to the punching metal, a perforated plate made of metal, or a perforated plate made of a synthetic resin such as vinyl chloride resin or ABS resin can be used for the flowing water resistance plate 6.

Further, the flowing water resistance plate 6 can be detachably disposed on the treated water outflow portion 5 of the outer water tank 1.
Thereby, when clogging etc. arise in the flowing water resistance plate 6, the flowing water resistance plate 6 can be easily cleaned or replaced | exchanged.
In addition, for the clogging of the flow resistance plate 6, the backwash water is supplied from the backwash nozzle 7 to the flow resistance plate 6 with the raw water introduced into the separation tank 2 stopped as necessary. (In this case, the backwash water can be supplied manually or (periodically) automatically.) (See the flow resistance plate 6 on the left side of FIG. 1A). ), The flow resistance plate 6 is configured to be openable and closable via the hinge 6a (can be swung downward) (in this case, the flow resistance plate 6 can be swung manually or (periodically) automatically. (See FIG. 1 (c).), The clogging of the flow resistance plate 6 can be eliminated.

When this magnetic separation apparatus A is used by being mounted on a swinging moving body such as a ship, the outer tank 1 and the separation tank 2 are inclined by the swinging of the moving body. Fluctuation in the amount of treated water discharged from the treated water outflow portions 5 of the outer water tanks 1 on both sides, that is, the amount of treated water flowing out from the treated water outflow edges 22 formed on both sides of the separation tank 2 of the magnetic separator A Therefore, the amount of water flowing between the magnetic disks 3 can be kept within an allowable range in terms of processing performance of the magnetic disks 3, and can be made substantially uniform. Adsorption / removal performance can be maintained within a certain range.
And in this magnetic separation apparatus A, the principle which can suppress the fluctuation rate of the amount of the treated water flowing out from the treated water outflow edge 22 formed on both sides of the separation tank 2 of the magnetic separation apparatus A is as follows. It is.

In the conventional magnetic separation apparatus A ′ shown in FIG. 4, the treated water flows out by overflowing from the treated water outflow edge 22 constituting the square weir formed on both sides of the separation tank 2, and is provided outside the separation tank 2. The amount of treated water flowing out by overflowing from the treated water outflow edge 22 formed on both sides of the separation tank 2 is determined as the overflow water depth h. Is proportional to the 3/2 power of.
The amount q ′ of treated water flowing out from one treated water outflow edge 22 at this time is expressed by the following equation, for example.
q ′ = Cbh ^(3/2)
C = 1.785 + 0.00295 / h + 0.237h / W−0.428 × [(B−b) h / (WB)] ^(1/2) + 0.034 × (B / W) ^(1/2)
here,
q ': Outflow water volume h: Overflow water depth B: Channel width W: Cough height b: Overflow width C: Flow coefficient.
As is clear from the above equation, the amount of treated water flowing out from the treated water outflow edge 22 formed on both sides of the separation tank 2 varies greatly due to the fluctuation of the overflow water depth h.

On the other hand, in the magnetic separation apparatus A of the present embodiment, the amount of treated water discharged from the treated water outflow portions 5 of the outer water tank 1 on both sides of the separation tank 2 of the magnetic separation apparatus A is It is proportional to the 1/2 power of the depth H of the treated water.
The amount q of the treated water flowing out from one treated water outflow edge 22, that is, the hole of the flow resistance plate 6 at this time, is expressed by the following equation, for example.
q = C · a · (2 gH) ^(1/2)
here,
q: Outflow water amount H: Water depth a: Hole area (total area of holes formed in the flow resistance plate)
C: Flow coefficient g: Gravitational acceleration.
As is clear from the above formula, in the magnetic separation apparatus A of the present embodiment, it flows out from the treated water outflow edge 22 formed on both sides of the separation tank 2 as compared with the conventional magnetic separation apparatus A ′. The fluctuation rate of the amount of treated water can be kept low.

FIG. 3 shows an image of the amount of change in each of the effluent amounts q and q ′.
The simulation results are shown in Table 1.
From the calculation result of Table 1, it can be said that there is a suppression effect of about 30 points.

  As mentioned above, although the magnetic separation apparatus of this invention and the ship carrying this were demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The range which does not deviate from the meaning The configuration can be changed as appropriate.

In the magnetic separation device of the present invention, the amount of treated water flowing out from the treated water outflow edge formed on both sides of the separation tank of the magnetic separation device is large even when a moving body such as a ship equipped with the magnetic separation device swings. The amount of water flowing between the magnetic disks can be suppressed to an acceptable range in terms of the processing performance of the magnetic disk, thereby making it substantially uniform. Since the removal performance can be maintained within a certain range, it can be suitably used for an application of a magnetic separation device mounted and used on a swinging moving body such as a ship.
In addition, a ship equipped with this magnetic separation device can contribute to the solution of the problem that aquatic organisms contained in ballast water affect the ecosystem as an alien species, so it should be used suitably for ships navigating the open ocean. Can do.

A Magnetic separator 1 Outer water tank 2 Separation tank 21 Introduction part 22 Outflow edge of treated water 3 Magnetic disk 4 Rotating shaft 5 Outflow part of treated water 6 Flow resistance plate 8 Ship

Claims (4)

  A magnetic separation device mounted on a swinging moving body such as a ship, wherein a separation tank into which raw water containing a magnetic floc is introduced and a rotating shaft disposed in the separation tank are arranged in parallel at an interval In the magnetic separation apparatus comprising a plurality of magnetic disks that attract the magnetic flocs by magnetic force, the water is discharged from the separation tank to a higher water level than the position of the treated water outflow edge formed on both sides of the separation tank. An outer water tank for retaining the treated water is provided, and in a unit time, the treated water flow rate discharged from the treated water outflow part of the outer water tank and the raw water flow rate introduced from the introduction part of the separation tank are balanced. Magnetic separator.   A separation tank into which raw water containing magnetic floc is introduced, and a plurality of magnetic disks that are arranged in parallel with a rotation shaft disposed in the separation tank and that adsorbs the magnetic floc by magnetic force. In the magnetic separation apparatus provided, an outer water tank for retaining treated water discharged from the separation tank is provided at a level higher than the position of the treated water outflow edge formed on both sides of the separation tank. A ship equipped with a magnetic separation device that balances the flow rate of treated water discharged from the treated water outflow portion with the flow rate of raw water introduced from the introduction portion of the separation tank.   A magnetic separation device mounted on a swinging moving body such as a ship, wherein a separation tank into which raw water containing a magnetic floc is introduced and a rotating shaft disposed in the separation tank are arranged in parallel at an interval In the magnetic separation apparatus comprising a plurality of magnetic disks that attract the magnetic flocs by magnetic force, the water is discharged from the separation tank to a higher water level than the position of the treated water outflow edge formed on both sides of the separation tank. By providing an outer water tank for retaining the treated water and disposing a flow resistance plate at the treated water outflow part of the outer water tank, the amount of treated water flowing out from the treated water outflow edge formed on both sides of the separation tank is reduced on both sides. A magnetic separation device characterized in that the magnetic separation device is uniform.   A separation tank into which raw water containing magnetic floc is introduced, and a plurality of magnetic disks that are arranged in parallel with a rotation shaft disposed in the separation tank and that adsorbs the magnetic floc by magnetic force. In the magnetic separation apparatus provided, an outer water tank for retaining the treated water discharged from the separation tank is provided at a higher water level than the position of the treated water outflow edge formed on both sides of the separation tank, and the treated water outflow portion of the outer water tank It is characterized in that a magnetic separation device is mounted so that the amount of treated water flowing out from the treated water outflow edges formed on both sides of the separation tank is equalized on both sides by disposing a flow resistance plate on the two sides. Ship.

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