JPH10290902A - Filter cartridge for separating water and oils - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely separate even fine emulsified oil contained in water containing oils by dividing a cylindrical cartridge into a plurality of blocks by partition plates each having through-holes and filling each block with a filter medium. SOLUTION: When water containing oils 2 in which emulsified oil is mixed is fed from below a cylindrical part 4 of a filter cartridge thereinto, the water containing oils 2 is passed through filter mediums 7 in a plurality of blocks 8 into which the part 4 is divided by partition plates 5 one by one and is discharged as coarse oil drops from above. At this time, the emulsified oil is caught in succession and the filters 1 become in a saturated state with oil to form oil films inside and outside the filters 1. After that, by also using the oil films, the emulsified oil is caught. And in the saturated state with oil, the filters 7 are made to have the crushed shape. Then, since the emulsified oil hardly passes together with the water containing oils 2, it is easily contacted with the filter mediums 7, and oil films are formed all over and also oil catching force is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oil / water separation filter cartridge, and more particularly to an oil / water separation filter cartridge for removing oil from oil-containing water containing emulsified oil.

[0002]

2. Description of the Related Art Among conventional oil-water separation filter cartridges, one of the most widely used methods for treating oil in oil-containing water is a coalescer cartridge utilizing a coalescence method (reference: industrial). Cleaning Technology Handbook, August 31, 1994, Realize Co., Chapter 14, Related Attached Technologies, pp. 296-300
page).

[0003] The principle of oil removal by a coalescer cartridge will be described with reference to the drawings. FIG. 3 (a), (b)
FIG. 2 is a cross-sectional view and a partial detailed view illustrating an example of a process using a conventional coalescer cartridge.

[0004] Due to physical force such as stirring by liquid convection, most of the oil in the oil-containing water 2 is dispersed and mixed in the water as fine and granular emulsified oil 1 (particle diameter of less than about 10 µm).
When the oil-containing water 2 containing the fine emulsified oil 1 is supplied to the cylindrical coalescer cartridge 9 in the liquid flow B direction, the resin fibers 10 having a three-dimensional network structure forming the coalescer cartridge 9 are formed. It passes through the gap and is discharged from the side.

At this time, the emulsified oil 1 is mixed with the intermingled resin fibers 10.
While being in contact with or colliding with the resin fiber, the resin fiber 10 travels through the gap between the resin fibers 10 of about several μm, and is originally trapped in the resin fiber 10 by transmitting on the surface of the resin fiber 10 having affinity for oil. Thereafter, similarly, the emulsified oil 1 that has passed between the resin fibers 10 is also captured by the oil that has been captured earlier, in addition to the oil-capturing power of the resin fibers 10, and the emulsified oil 1 is successively captured over time. As a result, the emulsified oils 1 are coagulated and coarsened in the resin fibers 10.

This phenomenon is caused by the coalescer cartridge 9
Is continued until the oil is saturated. After the saturation, the oil droplets 3 that are coagulated and grown larger than the emulsified oil 1 are discharged from the outlet side of the side surface of the coalescer cartridge 9 and have a specific gravity difference with water (water specific gravity> oil specific gravity). ) To rise to the water surface and be separated. The separated oil is separately collected by oil collecting means (not shown).

[0007]

The problem of the prior art described above is that the particle size of the emulsified oil contained in the oil-containing water is 10 mm in diameter.
Although it is less than μm, when extremely fine emulsified oil of about 1 μm is mixed, the oil-water separation efficiency is deteriorated.

The reason is that the particle size of the emulsified oil is extremely fine, so that it is not possible to sufficiently capture the emulsified oil by performing only one treatment with an oil-water separation filter cartridge using a mechanical fiber structure. It is.

Accordingly, an object of the present invention is to provide an oil-water separation filter cartridge which can reliably separate even very fine emulsified oil contained in oil-containing water.

[0010]

The oil-water separation filter cartridge of the present invention has a cylindrical portion and at least one through hole in the center portion through which oil-containing water passes. Including a plurality of partition plates for dividing into blocks, and a plurality of filter materials each having a capturing power for capturing the oil in the oil-containing water and accommodated in each of the blocks, so that the oil is captured a plurality of times. It is.

The oil-water separation filter cartridge is characterized in that the oil captured by the filter material is an emulsified oil, and the filter material becomes crushed as the capture of the oil proceeds. The filter material may be formed by laminating a plurality of thinly cut pieces having the same shape as the bottom surface of the tubular portion, or may be formed by laminating and filling strip-shaped pieces at an arbitrary volume density.

According to the oil-water separation filter cartridge of the present invention, emulsified oil contained in oil-containing water as fine oil droplets can be separated and removed. Therefore, more specifically, the inside of the oil-water separation filter cartridge is divided into a plurality of blocks by a partition plate with through holes,
Each block is filled with an oil-capturing filter material, so that one oil-water separation filter cartridge has a plurality of means relating to the capture of emulsified oil.

[0013]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view and a sectional view showing an embodiment of the present invention.

The oil-water separation filter cartridge shown in FIG. 1 has a cylindrical portion 4 (for example, having a diameter of 20 cm and a height of 56.5).
cm), a plurality of partition plates 5, and a plurality of filter materials 7. The inside of the cylindrical portion 4 is partitioned into a plurality of blocks 8 by a plurality of partition plates 5 having through holes 6 so that the oil-containing water 2 can pass through. In this embodiment,
The number of blocks 8 is five. Each of the partitioned blocks 8 is filled with a fibrous filter material 7 having an oil capturing power.

The filter material 7 is not particularly limited as long as it has an oil-capturing ability. However, a lipophilic and hydrophobic material is used. Among them, a polyolefin-based filter material is excellent in terms of production and cost. . The smaller the fiber diameter of the filter material 7 is, the better the fiber diameter is. In addition, the shape of the filter material 7 is the cylindrical portion 4.
Can be used by laminating a plurality of pieces that are thinly cut in the same shape as the bottom area of each block 8 vertically upward on each block 8, or cut into strips, and vertically cut at an arbitrary filling volume density. The layers may be stacked and filled in the same direction.

In the above-described embodiment, the case where the number of the blocks 8 is five is exemplified. However, it is needless to say that the number of the blocks 8 may be two to four or six or more.

FIG. 2 is a sectional view for explaining the operation of the embodiment shown in FIG. FIG. 2A shows a state at the beginning of use, and FIG. 2B shows a state after a certain time has elapsed.

When the oil-containing water 2 containing the emulsified oil 1 is supplied in the direction B from below the cylindrical portion 4 of the filter cartridge, the oil-containing water 2 is partitioned into a plurality of blocks 8 by the partition plate 5. After passing through each of the filter materials 7, the oil droplets 3 are discharged as coarse oil droplets 3 from above.

At this time, the emulsified oil 1 travels through the space between the fibers of several μm while coming into contact with or colliding with the interlaced fibers constituting the filter material 7, and the oil retaining power of the fibers having affinity with the oil originally In addition, the oil is also captured by the oil previously captured between the fibers, and the emulsified oil 1 is captured one after another with the passage of time, and the cohesive growth of the oil proceeds.

After a certain period of time, the filter material 7 is saturated with the captured oil. When the oil becomes saturated, an oil film is formed on the inside and outside of the filter material 7 by the oil, and thereafter, the capture of the emulsified oil 1 is continuously performed using this oil film.

In the oil-saturated state, oil enters the gaps between the fibers constituting the filter material 7 which initially contained air and moisture, and plays a role of promoting the adhesion between the fibers.
The filter material 7 has a collapsed shape. Since the water pressure from below by the oil-containing water 2 is added to this, the crushing of the filter material 7 further proceeds.

[0023] Then, the fiber gap of the filter material 7 becomes narrow, and it becomes difficult for the oil-containing water 2 to pass therethrough, and the emulsified oil 1 also becomes difficult to pass, so that the filter material 7 easily comes into contact with the filter material 7 and an oil film is formed as a whole. Combined with increased oil catching power.

As described above, in the oil-water separation filter cartridge according to this embodiment, since there are a plurality of filter materials 7 having the above-described cartridge structure, a plurality of coalescer cartridges according to the prior art are used in series. The same structure as that described above can be expected. For example, even if the emulsified oil 1 cannot be captured by the lowermost filter material 7 part, the effect of being able to be captured by the upper filter material 7 can be expected. As a result, emulsified oil 1
The ability to capture without escaping is improved.

[0025]

The first effect is that extremely fine emulsified oil contained in oil-containing water can be reliably separated and removed.

The reason for this is that the inside of the cylindrical cartridge is divided into a plurality of blocks by a partition plate having a through hole, and each block is filled with a filter material having an oil-capturing power. Is carried out a plurality of times, so that the ability to capture the emulsified oil is improved.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment of the present invention,
(B) is a sectional view.

FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention;
(A) is a sectional view showing an initial state of use, and (b) is a sectional view showing a state after a lapse of a predetermined time.

3A and 3B show an example of processing using a conventional coalescer cartridge, wherein FIG. 3A is a cross-sectional view, and FIG.
It is sectional drawing to which the part was expanded.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 emulsified oil 2 oil-containing water 3 oil drop 4 cylindrical part 5 partition plate 6 through hole 7 filter material 8 block 9 coalescer cartridge 10 resin fiber

Claims (5)

[Claims] 1. A cylindrical portion, a plurality of partition plates having at least one through hole in a central portion through which oil-containing water passes to divide the inside of the cylindrical portion into a plurality of blocks, An oil-water separation filter cartridge, comprising: a plurality of filter materials having a capturing power for capturing oil in oil-containing water and housed for each of the blocks, wherein the oil capture is performed a plurality of times. 2. The oil / water separation filter cartridge according to claim 1, wherein the oil captured by the filter material is an emulsified oil. 3. The oil-water separation filter cartridge according to claim 1, wherein the filter material has a shape that is crushed as the capture of the oil progresses. 4. The oil-water separation filter according to claim 1, wherein the filter material is formed by laminating a plurality of thinly cut pieces having the same shape as the bottom shape of the cylindrical portion. cartridge. 5. The oil-water separation filter cartridge according to claim 1, wherein the filter material is formed by laminating and filling the filter material into a strip shape at an arbitrary volume density.