JP5305405B2 - Magnetic separation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic separator which can be used by mounting it on a rocking mobile object such as vessel and also, can equalize the quantity of treated water flowing out of a treated water outlet edge formed on both sides of a separation tank of the magnetic separator, even when a mobile object rocks. <P>SOLUTION: This magnetic separator includes the separation tank 2 into which untreated water containing a magnetic flock flows, and a plurality of pieces of magnetic disc 3 which are juxtaposed as spaced on a rotary shaft 4 installed inside the separation tank 2 and attract the magnetic flock by magnetic force. Further, at the magnetic separator, an outside water tank 1 for reserving the treated water discharged from the separation tank 2, is installed at the higher level than the position for the treated water outlet edge 22 formed on both sides of the separation tank 2. The point is that, the same quantity of the treated water as the treated water to be discharged from the separation tank 2, is discharged from the treated water outlet part 5 of the outside water tank 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a magnetic separation device, and in particular, in a magnetic separation device that is used by being mounted on a swinging moving body such as a ship, it is formed on both sides of a separation tank of the magnetic separation device even if the moving body swings. The present invention relates to a magnetic separation device in which the amount of treated water flowing out from the treated water outflow edge is made equal.

Magnetic separation devices have been proposed and put to practical use as devices for removing pollutants present in raw water such as sewage, factory effluent and ship effluent (see, for example, Patent Documents 1 and 2).
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. 3, 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.

Japanese Patent Laid-Open No. 10-244424 JP 2009-101340 A

  By the way, in recent years, it has been pointed out that marine wastewater, particularly aquatic organisms contained in ballast water, affect the ecosystem as an alien species, and a magnetic separation device is used for pretreatment and / or posttreatment of this ballast water. It is beginning to be considered for use.

However, the magnetic separation device mounted on the ship naturally swings in the same manner as the ship swings.
By the way, 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 proportional to the 3/2 power of the overflow water depth h, but when the separation tank 2 is inclined, The overflow water depth h fluctuates, whereby 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, and as a result, the amount of water flowing between the magnetic disks 3 Becomes non-uniform and adversely affects the adsorption and removal performance of magnetic flocs by the magnetic disk 3.

  In view of the problems of the magnetic separation device mounted on a ship, the present invention provides a magnetic separation device that is mounted and used on a moving body such as a ship. An object of the present invention is 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 of the separation tank of the device.

In order to achieve the above object, a magnetic separation apparatus of the present invention is provided with a separation tank into which raw water containing magnetic flocs is introduced, and a rotating shaft disposed in the separation tank at a distance from each other. In a magnetic separation apparatus comprising a plurality of magnetic disks for adsorbing magnetic flocs by magnetic force, treated water discharged from the separation tank at a level higher than the position of the treated water outflow edge formed on both sides of the separation tank. the outer water tank provided for retention, by providing the water flow resistance plate treated water outlet portion formed on the bottom of the outer water tank, the same amount of raw water is introduced into the separation tank from the treated water outlet section of the outer water tank processing It is characterized by draining water.

In this case, the flowing water resistance plate can be made of a punching metal.

  Moreover, a flowing water resistance board can be arrange | positioned at the treated water outflow part of an outer side water tank so that attachment or detachment is possible.

  Further, the water depth of the outer water tank can be set so that the fluctuation rate of the water depth when the outer water tank and the separation tank are inclined ± 5 ° is less than ± 20%.

According to the magnetic separation apparatus of the present invention, a separation tank into which raw water containing magnetic floc is introduced and a rotating shaft disposed in the separation tank are arranged in parallel with an interval, and the magnetic floc is separated by a magnetic force. An outer water tank for retaining treated water discharged from the separation tank at a higher water level than the position of the treated water outflow edge formed on both sides of the separation tank. The magnetic separation device is mounted on an oscillating moving body such as a ship by providing and discharging the same amount of treated water as the raw water introduced into the separation tank from the treated water outflow part of the outer water tank. When used, 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 when the outer water tank and the separation tank are tilted by the swing of the moving body, that is, the magnetic separation device Both sides of the separation tank The fluctuation rate of the amount of treated water flowing out from the formed treated water outflow edge is suppressed to a low level, so that the amount of water flowing between the magnetic disks is kept within an allowable range in terms of processing performance of the magnetic disks, and is substantially uniform. Therefore, the magnetic floc adsorption / 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 addition, by disposing a flow resistance plate at the treated water outflow part of the outer water tank, the same amount of treated water as the raw water introduced into the separation tank can be easily discharged from the treated water outflow part of the outer water tank. Can do.
In addition, foreign substances that could not be removed at the position up to the magnetic disk can be captured and removed by the flow resistance plate.

  Moreover, the value of the flow resistance of the flow resistance plate can be arbitrarily set by configuring the flow resistance plate with a punching metal.

  In addition, if the flow resistance plate is detachably disposed at the treated water outflow part of the outer water tank, the flow resistance plate can be easily cleaned or replaced when the flow resistance plate is clogged. be able to.

  In addition, by setting the water depth of the outer water tank so that the fluctuation rate of the water depth when the outer water tank and the separation tank are inclined ± 5 ° is less than ± 20%, the outer water tanks on both sides of the separation tank of the magnetic separation device The amount of treated water discharged from the treated water outflow part, that is, the fluctuation rate of the amount of treated water flowing out from the treated water outflow edges formed on both sides of the separation tank of the magnetic separation device is in the range of about ± 10%. Can be suppressed.

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 sectional drawing which shows the conventional magnetic separation apparatus.

  Embodiments of a magnetic separation device according to the present invention 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 for retaining treated water discharged from the separation tank 2 is provided at the water level, and the same amount of treated water as the raw water introduced into the separation tank 2 is discharged from the treated water outflow part 5 of the outer water tank 1. ing.

  And the treated water outflow part 5 of the outer side water tank 1 is made to discharge | emit the same amount of treated water as the raw | natural water introduce | transduced into the separation tank 2 from the treated water outflow part 5 of the outer side water tank 1 as needed. The flow resistance plate 6 is arranged.

Thereby, when the magnetic separation apparatus A is mounted and used on a moving body such as a ship, the separation tank of the magnetic separation apparatus A is formed by the outer water tank 1 and the separation tank 2 being inclined by the movement of the moving body. 2, the amount of treated water discharged from the treated water outflow portion 5 of the outer water tank 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 separation device A. Therefore, the amount of water flowing between the magnetic disks 3 can be kept within an allowable range in terms of the processing performance of the magnetic disk 3 and can be made substantially uniform. Adsorption and removal performance 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 a metal such as an expanded metal, or a perforated plate made of a synthetic resin such as a vinyl chloride resin or an 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.

Further, the water depth variation rate when the outer water tank 1 and the separation tank 2 are inclined ± 5 ° from the horizontal level L with respect to the depth H of the outer water tank 1 to the treated water outflow portion 5 provided with the flow resistance plate 6 is ± It is preferable to set it to be less than 20%, preferably less than ± 15%, and more preferably less than ± 10%.
Thereby, 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 apparatus A, that is, the treated water formed on both sides of the separation tank 2 of the magnetic separation apparatus A. The fluctuation rate of the amount of treated water flowing out from the outflow edge 22 can be reduced.
Incidentally, the water amount Q ₀ of the treated water discharged from treated water outlet portion 5 of the outer water tank 1 when the outer water tank 1 and the separating tank 2 not inclined, when the outer water tank 1 and the separation tank 2 is tilted ± 5 ° The relationship between the amount Q ₁ and Q _{2 of} treated water discharged from the treated water outflow part 5 of the outer water tank 1 is
Q ₁ (or Q ₂ ) / Q ₀ = C · (2 g · H ₁ (or H ₂ ) / H ₀ ) ^1/2 (1)
here,
C: Constant H ₀ : Water depth H when the outer water tank 1 and the separation tank 2 are not inclined
H ₁ : Water depth H when outer water tank 1 and separation tank 2 are inclined + 5 °
H ₂ : Water depth H when the outer water tank 1 and the separation tank 2 are tilted by −5 °.
It is.
Therefore, from the above formula (1), when the fluctuation rate of the water depth is less than ± 20%, the water is 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 apparatus A. If the fluctuation rate of the treated water is within the range of ± 10% and the fluctuation rate of the water depth is less than ± 15%, the fluctuation rate of the water depth is less than ± 10% within the range of ± 8%. In this case, it can be suppressed within a range of about ± 5%.

Here, when the same amount of treated water as the raw water introduced into the separation tank 2 can be discharged from the treated water outflow part 5 of the outer water tank 1, that is, the discharge capacity of the treated water outflow part 5 of the outer water tank 1 and When the amount of raw water introduced into the separation tank 2 is balanced, it is not necessary to provide the flow resistance plate 6 (opening ratio α: 100%), but usually the treated water outflow of the outer water tank 1 Since the discharge capacity of the unit 5 is set to be larger than the amount of raw water introduced into the separation tank 2, the same amount of treatment as the raw water introduced into the separation tank 2 from the treated water outflow part 5 of the outer water tank 1 is set. In order to discharge water, a flow resistance plate 6 having a predetermined opening ratio α is provided.
The opening ratio α of the flow resistance plate 6 is set so that the same amount of treated water as the raw water introduced into the separation tank 2 can be discharged from the treated water outflow portion 5 of the outer water tank 1.
Thereby, the water depth H of the treated water in the outer water tank 1 is kept constant, and 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, that is, magnetic The variation 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 separation apparatus A can be reduced.
Incidentally, the opening ratio α of the flow resistance plate 6 is the amount Q of raw water introduced into the separation tank 2 and the separation tank 2 of the magnetic separation device A when the flow resistance plate 6 is not provided (open ratio α: 100%). It can be calculated based on the following formula (2) from the relationship with the amount Qa of treated water discharged from the treated water outflow part 5 of each of the outer water tanks 1 on both sides.
Opening ratio α = Q / (2 · Qa) (2)

As described above, when the magnetic separation apparatus A is used by being mounted on a swinging movable body such as a ship, the magnetic separation apparatus A is configured such that the outer water tank 1 and the separation tank 2 are tilted by the swing of the movable body. 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, that is, the treated water flowing out from the treated water outflow edges 22 formed on both sides of the separation tank 2 of the magnetic separation apparatus 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 disk 3, and can be made substantially uniform. The magnetic floc adsorption / removal performance by 3 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 ′, the 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 the outer water tank 10 provided outside the separation tank 2 is discharged. Therefore, the amount of the treated water flowing out from the treated water outflow edge 22 formed on both sides of the separation tank 2 is 3/2 of the overflow depth h. Since it is proportional, the amount of the treated water flowing out from the treated water outflow edge 22 formed on both sides of the separation tank 2 greatly fluctuates due to the fluctuation of the overflow water depth h.
On the other hand, in this magnetic separation apparatus A, 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 the treated water of the outer water tank 1. Since it is proportional to the 1/2 power of the water depth H, 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 is lower than in the conventional magnetic separation apparatus A ′. It can be suppressed.

  The magnetic separation device of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration is appropriately changed without departing from the gist thereof. Is something that can be done.

  In the magnetic separation device of the present invention, the amount of treated water flowing out from the treated water outflow edges formed on both sides of the separation tank of the magnetic separation device is equalized even if the moving body equipped with the magnetic separation device swings. As a result, the amount of water flowing between the magnetic disks can be kept substantially within the allowable range in terms of the processing performance of the magnetic disk, and the magnetic floc adsorption and removal performance by the magnetic disk is constant. Therefore, it can be suitably used for a magnetic separation device that is mounted on and used on a swinging moving body such as a ship.

A Magnetic separation device 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

Claims (4)

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. the magnetic separation apparatus comprising an outer water tank which retained the treated water discharged from the separation tank at a higher level than the position of the formed on both sides treated water outflow edge of the separation tank provided, formed at the bottom of the outer water tank A magnetic separation device characterized in that the same amount of treated water as the raw water introduced into the separation tank is discharged from the treated water outflow part of the outer water tank by disposing a flowing water resistance plate in the treated water outflow part. . The water flow resistance plate, magnetic separation apparatus according to claim 1, characterized by being configured by punching metal. The magnetic separator according to claim 1 or 2 , wherein the flow resistance plate is detachably disposed on the treated water outflow portion of the outer water tank. The depth of the outer water tank, magnetic Claim 1 or 3, wherein the variation rate of the water depth, characterized in that set to be less than ± 20% when the outside water tank and separation tank is tilted ± 5 ° Separation device.

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