JP4568611B2 - Oil / water separator - Google Patents

Description

  The present invention relates to an oil / water separation device that separates water to be treated into oil and water when the water to be treated such as waste water is mixed with oil, such as billage water in a ship. is there.

In Patent Document 1 as a prior art, first, water to be treated containing oil is introduced into a preceding separation chamber, where a coarsening element having a relatively coarse opening (extra poles while passing through a permeation hole). Large oil droplets are coarsened and floated and separated by passing through a material having the function of agglomerating and coarsening fine oil droplets, and then the water to be treated from the preceding separation chamber is separated from the latter separation chamber. Here, small oil droplets are coarsened and floated and separated by passing through a coarsening element having a finer opening than the coarsening element in the preceding separation chamber, and the oil content in the treated water is reduced. It has been proposed to separate these at a high separation rate.
JP-A-8-309102

  However, in this prior art, it is possible to further improve the oil separation rate by making the openings of the coarsening elements in the latter separation chambers finer in each of the separation chambers. In addition, since the solid particle component is also contained at the same time, the solid particle component closes the eyes in the coarse-grained element with a fine opening in the latter stage.

  In other words, in order to improve the separation rate of the oil component, the grain of the coarsening element in the subsequent stage is included in the water to be treated in order to make the opening of the coarsening element in the latter stage fine. There was a problem that there was a limit in that it was clogged with solid particle components.

  In this case, clogging due to the solid particle component contained in the water to be treated can be eliminated by separating and removing the solid particle component by filtering the water to be treated in advance with a filter element. If the water to be treated is preliminarily filtered, the oil contained in the water to be treated may clog the filter element rapidly or increase the filtration resistance significantly. Therefore, the filtration of the water to be treated is significantly hindered.

  In particular, in the latter coarsening element, the separation rate of the oil can be further improved by making the opening finer, but if the opening in the latter coarsening element is made finer, the oil content is large. Since the oil droplets are not separated from the coarsening elements without agglomerating into the oil droplets, clogging due to the oil droplets is also a problem in the coarsening elements with fine openings.

  This invention makes it a technical subject to provide the oil-water separator which eliminated these problems.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A pre-separation chamber having a built-in coarsening element and a post-separation chamber containing a coarsening element with a finer opening than the coarsening element in the pre-separation chamber, Is supplied to the pre-stage separation chamber, passes through the coarsening element in the pre-stage separation chamber, and then to-be-treated water discharged from the pre-stage separation chamber is supplied to the post-stage separation chamber. An oil-water separator configured to pass through the coarsening element in a chamber;
A filter for separating the solid particle component contained in the water to be treated from the preceding separation chamber to the latter separation chamber by filtering it with a filter element is provided. On the downstream side of the graining elements, the graining elements with coarse openings are stacked. "
It is characterized by that.

Further, claim 2 of the present invention is
“In the description of claim 1, the coarse-grained elements with fine openings and the coarse-grained elements with coarse openings in the subsequent separation chamber are made of a hydrophilic material.”
It is characterized by that.

Furthermore, claim 3 of the present invention provides
“In the description of claim 2, the coarsening element in the preceding separation chamber and the filter element in the filter are made of a hydrophilic material.”
It is characterized by that.

  According to the configuration described in claim 1, the water to be treated containing oil and solid particle components is first supplied into the preceding separation chamber and passes through the coarsening element incorporated in the preceding separation chamber. As a result, the oil droplets in the water to be treated are aggregated and coarsened, and float and separate to the upper part of the front separation chamber.

  The treated water from which oil has been separated in the preceding separation chamber thus reaches the filter from the preceding separation chamber, and is contained in the treated water by being filtered by the filter element. Solid particle components are separated and removed.

  Next, the water to be treated flows into the downstream separation chamber from the filter and passes through a coarse graining element having a fine mesh incorporated in the downstream separation chamber, whereby fine oil in the water to be treated is obtained. The droplets are trapped by the coarsening element having a fine opening.

  In this case, the to-be-processed water which passes the coarse-graining element with a fine opening in a back | latter stage separation chamber isolate | separates and removes the solid particle component beforehand with the said filter, This coarse-graining element with a fine opening In addition, the occurrence of clogging due to the solid particle component can be reliably suppressed.

  On the other hand, the water to be treated filtered by the filter element in the filter is in a state where the oil concentration is low enough to remove the oil in the preceding separation chamber. It is possible to reliably reduce clogging and increase in filtration resistance due to oil, and the filter not only separates solid particle components in the water to be treated but also captures oil droplets. Therefore, the overall oil separation rate can be improved as compared with the case where this filter is not provided.

The coarse-grained elements with fine openings are laminated on the downstream side of the coarse-grained elements with fine openings in the downstream separation chamber, so that the coarse-grained elements with fine openings are stacked. The trapped oil droplets will rapidly grow into large oil droplets due to the coarse graining elements stacked on the downstream side, and these large oil droplets will rapidly grow from each of these coarsening elements. Therefore, it is possible to reliably reduce the occurrence of clogging due to oil droplets in the first coarsening element having a coarse opening.

  In addition, as described in claim 2, each of the coarse-grained elements and the coarse-grained elements having a fine opening in the latter separation chamber are made of a hydrophilic material, so that each of the coarse-grained elements is formed. Since the separation of the oil droplets from the element can be promoted, there is an advantage that the oil separation rate and the clogging reduction due to the oil droplets can be further promoted by the coarse-grained elements having fine openings and the coarse-grained elements having coarse openings.

  Furthermore, as described in claim 3, since all the coarsening elements and filter elements are made of a hydrophilic material, oil droplet separation from each of these coarsening elements and filter elements can be promoted. , Each effect mentioned above can be promoted.

  An embodiment of the present invention will be described below with reference to the drawing of FIG.

  In FIG. 1, reference numeral 1 denotes a sealed container configured in a vertical cylindrical shape standing from a floor surface 2.

  The interior of the sealed container 1 is partitioned into an upper front separation chamber 4 and a lower rear separation chamber 5 by providing a partition plate 3.

  In the upper part of the preceding separation chamber 4, a supply port 6 for introducing water to be treated containing oil and solid particle components into the preceding separation chamber 4 with a pump 22 is provided, and an oil extraction port 7 is provided. Is provided.

  Further, a mesh layer 8 made of metal fibers is provided in a portion below the supply port 6 in the preceding separation chamber 4, and a through-hole is formed in the center below the mesh layer 8 of the metal fibers. Is provided on the lower surface of the support plate 9 and the treated water flowing down in the preceding separation chiver 4 is supplied to the roughening element 10. 10 is configured to pass outwardly from the inside.

  Furthermore, the upstream separation chamber 4 is provided with a discharge port 11 for water to be treated at the bottom thereof, that is, above the partition plate 3, and an oil extraction opening below the support plate 9. A mouth 12 is provided.

  On the other hand, at the top of the rear separation chamber 5, that is, below the partition plate 3, water to be treated from the discharge port 11 in the front separation chamber 4 is introduced into the upper part of the rear separation chamber 5. An inflow port 13 is provided.

  Further, a support plate 14 having a through hole in the center is provided in the lower separation chamber 5 below the inflow port 13, and a cylindrical plate is formed on the lower surface of the support plate 15. 1 coarse graining element 15 and a second coarse graining element 16 wound around the outer periphery of the coarse graining element 15 are provided. And it is comprised so that the 2nd coarsening element 16 may pass outward from the inner side.

Furthermore, the downstream separation chamber 5 is provided with an outlet 17 for water to be treated at the bottom thereof, an oil extraction port 18 opened below the partition plate 3, and the support plate 1.
4 is provided with an oil extraction port 19 that opens on the lower side.

  In this case, the coarsening element 9 in the preceding separation chamber 4 is made of hydrophilic fibers and has a relatively coarse opening, for example, about 10 to 100 μm, preferably 30 to 70 μm. Although the mesh is open, the first coarsening element 15 in the latter separation chamber 5 is also made of a hydrophilic fiber and has a fine opening, for example, about 5 μm or less. The second coarsening element 16 in the post-stage separation chamber 5 is also made of a hydrophilic fiber and has a mesh size of, for example, about 50 μm. It is also rough.

  Each oil extraction port 7, 12, 18, 19 is provided with an on-off valve 7a, 12a, 18a, 19a.

  A filter element 20 that separates solid particle components contained in the water to be treated by filtration is provided between the discharge port 11 from the upstream separation chamber 4 and the inlet 13 to the downstream separation chamber 5. The filter element 20 in the filter 21 is made of hydrophilic fibers and has an opening of 0.5 to 0.5, for example, as in the case of each of the coarsening elements. The aperture is not larger than the opening of the first coarsening element 15 so as to be 15 μm, preferably 5 to 10 μm.

  In this configuration, the water to be treated containing oil and solid particle components is first supplied from the supply port 6 into the upstream separation chamber 4, and in this upstream separation chamber 4, some of the large oil droplets are separated from the upstream separation chamber 4. 4 so as to float toward the top of the inside.

  Next, when passing through the metal fiber mesh 8 incorporated in the former stage separation chamber 4, the oil droplets are partly aggregated and coarsened into large oil droplets, and are formed at the top in the former stage separation chamber 4. Separate so that it floats up.

  Next, by passing through the coarsening element 10 built in the preceding separation chamber 4 from the inside to the outside, the oil droplets in the water to be treated are aggregated and coarsened to form the preceding separation chamber. 4 so as to float toward the top of 4 and the lower surface of support plate 9.

  The treated water from which oil has been separated in the upstream separation chamber 4 in this way reaches the filter 21 from the discharge port 11 at the bottom of the upstream separation chamber 4, and is filtered by the filter element 20 in the filter 21. As a result, the solid particle component contained in the water to be treated is separated and removed.

  Next, the water to be treated that has flowed out of the filter 21 flows into the downstream separation chamber 5 from the inlet 13, and the first coarsening element 15 and the second coarsening that are incorporated in the downstream separation chamber 5. By passing through the element 16 from the inner side toward the outer side, the fine oil droplets in the water to be treated are aggregated and coarsened to float toward the top in the rear separation chamber 5 and the lower surface of the support plate 14. To separate.

  Then, the water to be treated whose oil concentration is lowered by this separation is discharged from the discharge port 17 at the bottom of the rear separation chamber 5, while the top of the front separation chamber 4, the lower surface of the support plate 9, and the rear separation. When an appropriate amount of oil has floated on the top of the chamber 5 and the lower surface of the support plate 14, the on-off valves 7 a, 12 a, 18 a, and 19 a at the respective oil extraction ports 7, 12, 18, and 19 are provided. By opening, it is discharged to the outside.

  That is, in the latter separation chamber 5, the water to be treated that passes through the first coarsening element 15 and the second coarsening element 15 is separated and removed in advance by the filter 21. The clogging due to the solid particle component can be reliably suppressed from occurring in the first coarsening element 15 having a fine mesh opening.

  The water to be treated filtered by the filter element 20 in the filter 21 is in a state where the oil concentration is low enough to remove the oil in the pre-stage separation chamber 4. It is possible to reliably reduce the occurrence of clogging due to the oil and the increase in filtration resistance due to the oil, and also to capture oil droplets in the water to be treated by filtration by the filter element 20 in the filter 21. it can.

  On the other hand, in the rear separation chamber 5, the second coarse particles having a coarse opening are formed on the outside of the first coarse element 15 having a fine mesh, that is, on the downstream side of the first coarse element 15. As a result, the oil droplets captured by the first coarsening element 15 rapidly grow into large oil droplets by the second coarsening element 16 laminated on the downstream side. The large oil droplets quickly leave the coarsening elements 15 and 16 and float on the upper part of the rear separation chamber 5. It is possible to reliably reduce clogging due to oil droplets in the granulating element 15.

  Further, the coarsening element 10 in the preceding separation chamber 4, the coarsening elements 15 and 16 in the latter separation chamber 5, and the filter element 20 in the filter 21 are made of hydrophilic fibers. Since oil can be prevented from adhering, oil droplet separation from each of the coarsening elements 10, 15, 16 and the filter element 20 can be surely promoted.

  The above embodiment is a case where the coarsening elements in the latter separation chamber 5 are configured in two layers of an inner first coarsening element 15 and an outer second coarsening element 16. However, the present invention is not limited to this, and the coarsening element in the latter separation chamber 5 is formed into a plurality of layers of three or more layers, and the openings are gradually roughened toward the downstream side of the flow. It goes without saying that it is also good.

  Further, as described above, each of the coarsening elements 10, 15, 16 and the filter element 20 is not limited to a hydrophilic fiber, and may be a hydrophobized hydrophobic fiber. It may be configured to have an infinite number of minute holes.

It is a vertical front view which shows embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 3 Partition plate 4 Front stage separation chamber 5 Rear stage separation chamber 6 Supply port of to-be-processed water 10 Coarse graining element with coarse opening 11 Discharge port of to-be-processed water 13 Inlet of to-be-processed water 1 coarse graining element 16 2nd coarse graining element with coarse opening 17 Discharge port for treated water 7, 12, 18, 19 Oil extraction port 21 Filter 20 Filter element

Claims (3)

A pre-stage separation chamber containing a coarse-graining element; and a post-stage separation chamber containing a coarse-graining element with a finer opening than the coarse-graining element in the pre-stage separation chamber. , Supplying the pre-stage separation chamber, passing through the coarsening element in the pre-stage separation chamber, and then supplying the water to be treated discharged from the pre-stage separation chamber to the post-stage separation chamber. In the oil-water separator configured to pass through the coarsening element in
A filter for separating the solid particle component contained in the water to be treated from the preceding separation chamber to the latter separation chamber by filtering it with a filter element is provided. An oil-water separator characterized by laminating coarse grained elements with coarse openings on the downstream side of the granulated elements.   2. The oil-water separator according to claim 1, wherein the coarse-grained elements having fine openings and the coarse-grained elements having coarse openings in the subsequent separation chamber are made of a hydrophilic material.   3. The oil / water separator according to claim 2, wherein the coarsening element in the preceding separation chamber and the filter element in the filter are made of a hydrophilic material.

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