JPH115095A - Double inversion type magnetic separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the outflow of activated sludge by passing an activated sludge liquid added with magnetic powder to a flow passage and disposing magnet disks which rotate in the backward direction of the flow and magnet disks which rotate in the forward direction of the flow upstream and downstream when the activated sludge is magnetically separated by rotating the magnet disks within the activated sludge flow. SOLUTION: The straight flow passage 1 is formed in order to pass the activated sludge flow added with the magnetic powder. The inlet 2 side of this flow passage 1 is provided with a backward rotating and separating section 3 consisting of the magnet disk rotating in the backward direction of the flow. The outlet side 4 is provided with a forward rotating and separating section 5 consisting of the magnet disks rotating in the forward direction of the flow. The backward rotating and separating section 3 is advantageous in that the section is capable of separating a large amt. of the activated sludge. On the other hand, this section is disadvantageous in that the activated sludge fails to be attracted to the magnet disks on account of vortexes and the run-out of the activated sludge is resulted. The downstream side is, thereupon, provided with the forward rotating and separating section 5 which obviates the peeling of the activated sludge, if small in amt., and is capable of surely separating the activated sludge without the outflow thereof. The formation of the treated water enhanced in cleanliness is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separation apparatus for separating an activated sludge solution into activated sludge and treated water,
The present invention relates to a contra-rotating magnetic separation device for preventing outflow of activated sludge.

[0002]

2. Description of the Related Art A magnetic separation device is known as a device for separating activated sludge such as sewage into activated sludge and treated water. This apparatus separates activated sludge from treated water by adding magnetic powder to activated sludge liquid and applying magnetic force to the activated sludge liquid to magnetically adsorb activated sludge (activated sludge particles). . Specifically, as shown in FIG. 3, a magnet disk 32 in which a large number of magnets 31 are arranged around the board surface is formed, and a part of the magnet disk 32 is immersed in the flow of the activated sludge liquid 33. So that the scraper 34 faces the exposed portion of the magnet disk 32. When the magnet disk 32 rotates around the axis 35, the activated sludge adsorbed on the magnet disk 32 in the activated sludge liquid 33 is transferred onto the liquid surface,
It is removed by the scraper. Thereby, separation can be performed continuously, and treated water is discharged to the outlet.

[0003]

By the way, in Japanese Patent Application No. Hei 7-158846 filed by the present applicant, the moving direction of the magnet disk 32 in the activated sludge liquid 33 is the same as the flowing direction of the activated sludge liquid 33. That is, the magnet disk 32 was rotated in the forward direction of the flow (solid arrow). However, if the amount of adsorbed activated sludge becomes large, the action of magnetic force is weakened due to the long distance from the surface of the magnet disk to the adsorbed activated sludge, and the activated sludge is separated, and the separated activated sludge is treated water. Together with the spill. Therefore, it is not suitable for separating a large amount of activated sludge.

On the other hand, Japanese Patent Application No. 8-6 filed by the present applicant
In No. 8341, the magnet disk 32 is rotated in the reverse direction of the flow (indicated by a dashed line), so that the side where the activated sludge is not adsorbed to the magnet disk 32 is the outlet side. Thereby, a large amount of activated sludge can be separated.

However, in the case of reverse rotation, the relative velocity with the activated sludge becomes large on the surface of the magnet disk, and vortices may be generated. The movement of the activated sludge particles is hindered by the vortex, and the activated sludge flows out without being adsorbed on the magnet disk.

[0006] Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a contra-rotating magnetic separation apparatus for preventing the outflow of activated sludge.

[0007]

In order to achieve the above-mentioned object, the present invention provides an activated sludge solution to which magnetic powder is added, which flows through a flow path, and a magnet disk having a magnet disposed therearound is used for the flow of the activated sludge solution. Provided by partially immersing, by rotating this magnet disk, in a magnetic separation device that continuously magnetically separates activated sludge, provided a magnet disk that rotates in the opposite direction of the flow,
On the outlet side of the magnet disk, a magnet disk rotating in the forward direction of the flow is provided.

The above-mentioned flow path is folded so that the reciprocating flow paths are adjacent to each other, and straddling these reciprocating flow paths, a magnet disk rotating in the reverse direction on the outward path and a magnet disk rotating in the forward direction on the return path are collectively formed. A common rotating shaft that is driven to rotate may be provided.

The partition for partitioning the reciprocating flow path may be configured to be freely movable in the width direction of the flow path.

[0010]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In the first embodiment of the present invention, as shown in FIG. 1, a linear flow path 1 is formed for flowing an activated sludge liquid to which magnetic powder is added, And a reverse rotation separating section 3 composed of a magnet disk (not shown) rotating in the reverse direction of the flow, and a magnet disk (not shown) rotating in the forward direction (forward direction) of the flow at the outlet 4 side. A positive rotation separation unit 5
Is provided. The magnet disk is attached to rotating shafts 6 and 7 provided across the flow path 1. A magnet disk can be mounted in multiple stages on one rotating shaft. In the illustrated example, the reverse rotation separation unit 3 and the normal rotation separation unit 5 each include a four-stage magnet disk.

Here, when reconsidering the problems of the prior art,
The reverse rotation separation unit 3 has an advantage that a large amount of activated sludge can be separated, but on the other hand, there is a disadvantage that the activated sludge flows out without being adsorbed on the magnet disk due to the vortex. On the other hand, when the activated sludge is present in a large amount in the normal rotation separation section 5, the separated activated sludge flows out because the magnetic force does not reach. However, if the amount of the activated sludge is small, no separation occurs and the activated sludge can be surely separated without flowing out.

Therefore, in the present invention, first, a large amount of activated sludge is separated by the reverse rotation separation unit 3 arranged on the inlet 2 side.
Activated sludge may flow out of the reverse rotation separation unit 3.
The intermediate treated water containing the activated sludge flowing out is not suitable as the final treated water, but contains only a small amount of activated sludge enough to separate without causing separation in the forward rotation separation unit 5.

When the activated sludge is separated from the intermediate treated water by the forward rotation separation unit 5, treated water having a higher degree of cleanness is discharged from the outlet 4.

In the second embodiment of the present invention, as shown in FIG.
22 are adjacent to each other. Entrance 23 is outbound 2
1 is provided on the side of the start end, and the exit 24 is
And the inlet 23 and the outlet 24 are located at positions facing each other. A partition wall 27 is provided from a wall surface 25 that linearly connects the inlet 23 and the outlet 24 to the turnback portion 26, and the partition wall 27 allows the reciprocating flow paths 21, 21.
The space between the two portions is partitioned, and a portion where the partition wall 27 is broken serves as a flow path of the folded portion 26. The reverse rotation separation unit 28 is provided on the forward path 21, and the forward rotation separation unit 29 is provided on the return path 22.

The activated sludge which has entered the outward path 21 from the inlet 23 passes through the reverse rotation separation section 28 and reaches the turnback section 26.
Here, it reverses and enters the return path 22, and reaches the outlet 24 through the forward rotation separating section 29. With this configuration, two types of forward and reverse separation units can be compactly integrated in an integrated separation device.

For example, when the activated sludge concentration is 100
If it is 0 ppm, most of the activated sludge is separated in the reverse rotation separation unit 21, and the activated sludge flows out of the reverse rotation separation unit 21. For example, 100 ppm. 1
If it is 00 ppm, it is unsuitable as the final treated water, but it contains only a small amount of activated sludge that is sufficiently small to separate without causing separation in the forward rotation separation unit 29. When the activated sludge is separated from the intermediate treated water by the forward rotation separation unit 29, treated water having a higher degree of cleanness, for example, 10 ppm, is discharged from the outlet 24.

Further, in the second embodiment of the present invention, the common rotary shaft 41 is provided so as to straddle the reciprocating flow paths 21 and 22. A magnet disk (not shown) is attached to the common rotating shaft 41 in multiple stages. All the magnet disks are driven to rotate together and rotate in the same direction. However, since the flow direction of the activated sludge liquid (intermediate treated water) is reversed in the reciprocating flow paths 21 and 22, the reverse rotation is performed in the outward path 21. In the return path 22, the magnetic disk rotates in the forward direction. With this configuration, only one rotating shaft is required, and only one drive motor is required. Therefore, the separation device is simple and compact.

In the illustrated example, a total of 11 stages of magnet disks are provided. Of these, seven stages are used for the reverse rotation separation unit 28 and four stages are used for the forward rotation separation unit 29. However, the number of steps of the magnet disk is not limited to the illustrated example, and the total number of steps may be any number, and even if the total number of steps is determined, the reciprocating flow paths 21 and 22 may be determined depending on the position of the partition wall.
, The distribution of the magnet disk used for the reverse rotation separation unit 28 and the magnet disk used for the forward rotation separation unit 29 can be freely set.

In the third embodiment of the present invention, a partition wall 27 for partitioning between the reciprocating flow paths shown in FIG. 2 is configured to be movable in the width direction of the flow path. That is, the inlet 23 and the outlet 2
4 is not fixedly provided at the position shown in the figure, but a partition wall 27 is formed separately from the wall surface 25 that linearly connects the magnetic disk 4 to the bottom of the flow path between the magnet disks and the wall surface 25. A groove or the like to be fitted is provided so that the partition wall 27 can be transferred between arbitrary magnetic disks. Thereby, the capabilities of the reverse rotation separation unit 28 and the forward rotation separation unit 29 can be changed according to the driving situation.

[0021]

The present invention exhibits the following excellent effects.

(1) Most of the activated sludge can be separated in the reverse rotation separation section, and the cleanliness can be increased in the subsequent forward rotation separation section, so that the performance of the magnetic separation apparatus is greatly improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a separation device according to an embodiment of the present invention.

FIG. 2 is a plan view of a separation device showing another embodiment of the present invention.

FIG. 3 is a side view of a conventional separation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow path 2 Inlet 3 Reverse rotation separation part 4 Exit 5 Forward rotation separation part

Claims (3)

[Claims] 1. Activated sludge liquid to which magnetic powder is added is caused to flow through a flow path, and a magnet disk having a magnet disposed therearound is provided by being partially immersed in the flow of the activated sludge liquid, and the magnet disk is rotated. In a magnetic separation device for continuously magnetically separating activated sludge, a magnetic disk rotating in the opposite direction of the flow is provided,
A contra-rotating magnetic separation device, wherein a magnet disk rotating in the forward direction of the flow is provided on the outlet side of the magnet disk. 2. A magnet disk rotating in the reverse direction on the outward path and a magnet disk rotating in the forward direction on the return path so that the reciprocating flow paths are adjacent to each other by turning over the flow path and straddling the reciprocating flow paths. 2. The contra-rotating magnetic separation apparatus according to claim 1, further comprising a common rotation shaft that is driven to rotate collectively. 3. The contra-rotating magnetic separation apparatus according to claim 2, wherein the partition for partitioning the reciprocating flow path is configured to be freely movable in the width direction of the flow path.