JP4577773B2 - Oil / water separator - Google Patents

Description

  The present invention relates to an oil-water separator 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 water in a ship.

In Patent Document 1 as a prior art, first, water to be treated containing oil is introduced into a preceding separation chamber, where a coarser graining element (which is extremely fine while passing through a perforation hole). The oil droplets are coarsened and floated and separated by passing through a material having a function of agglomerating and coarsening the oil droplets, and then the treated water from the preceding separation chamber is led into the latter separation chamber. Here, by passing through the coarser element that is finer than the coarser element in the preceding separation chamber, the oil droplets are coarsened and floated to separate the oil in the water to be treated at a high separation rate. It has been proposed to do.
JP-A-8-309102

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

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

  In this case, the 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 through a filter element. By pre-filtering the water, the oil contained in a large amount of the water to be treated causes the filter element to be clogged rapidly, or the filtration resistance is remarkably increased. This significantly impedes filtration of the water to be treated.

  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-stage separation chamber containing a relatively coarse-grained coarsening element, and a post-stage separation chamber containing a fine-grained coarser element than the coarse-grained element in the pre-stage separation chamber, In the oil / water separator configured to supply the water to be treated to the front separation chamber and then to send the water to be treated discharged from the front separation chamber to the rear separation chamber,
A filter configured to separate the solid particle component contained therein by filtering the water to be treated from the preceding separation chamber to the subsequent separation chamber through a filter element is provided. "
It is characterized by that.

Further, claim 2 of the present invention provides
“The inside of the vertical sealed container is partitioned by a partition plate into an upper front separation chamber and a lower rear separation chamber, and a coarser graining element is provided in the front separation chamber. In the former stage separation chamber, the water to be treated supplied from the supply port at the top thereof is configured to be discharged from the outlet provided below after passing through the coarsening element in the former stage separation chamber, In the latter separation chamber, a coarser grain element is provided that is finer than the coarser element in the former separation chamber, and the water to be treated that has flowed into the latter separation chamber from the inlet at the upper part thereof is provided in the latter stage separation chamber. After passing through the coarsening element in the separation chamber, it is configured to discharge from a discharge port provided therebelow. A filter that separates solid particle components contained therein by filtering the water to be treated from the discharge port of the separation chamber to the inlet of the subsequent separation chamber by a filter element is provided separately from the sealed container. As well. "
It is characterized by that.

Effects and effects of the invention

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

  The treated water from which oil has been separated in the preceding separation chamber in this way 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 treated water flows from the filter into the downstream separation chamber, and passes through a fine graining element built in the downstream separation chamber, whereby fine oil droplets in the treated water are obtained. Coagulate and coarsen and float and separate at the upper part in the latter separation chamber.

  In this case, the water to be treated that passes through the fine graining element in the subsequent separation chamber is separated and removed in advance by the filter, so that the fine graining element is Generation | occurrence | production of the clogging by a solid particle component can be suppressed reliably.

  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 the occurrence of clogging and the increase in filtration resistance due to oil.

  By the way, the filter only separates the solid particle component in the water to be treated and does not separate the oil. However, as will be described in detail in the embodiment, according to the experiment, the former separation chamber and the latter separation chamber are used. By providing the filter between the two, the oil separation rate as a whole can be improved as compared with the case where this filter is not provided.

  Moreover, according to the structure described in Claim 2, since the said 1st stage separation chamber and the 2nd stage separation chamber can be integrated as one vertical sealed container, a 1st stage separation chamber and a 2nd stage separation chamber are separately provided. Compared to the configuration, the size and weight can be greatly reduced, and the floor area of the installation can be reduced.

  In this case, since the filter is a separate body from the sealed container, the filter element in the filter can be easily replaced.

Further, as described in claim 3, and a filter element in the filter, or to use a filter element that is the same eye as roughening elements in the rear stage separation chamber, or crude in the second-stage separation chamber By using a filter element that is smaller than the granulating element, clogging of the coarsening element in the latter separation chamber can be achieved more reliably.

  The coarse-grained element includes a so-called hydrophilic material having a strong interaction with water and a so-called lipophilic material having a strong interaction with oil.

Therefore, as described in claim 4, by making the coarsening element in the post-separation chamber a hydrophilic material, oil droplets aggregated and coarsened when passing through the coarsening element. Since it floats away and separates quickly without adhering to the hydrophilic coarsening element, the oil separation rate can be further improved.

  In addition, as described in claim 5, the filter element in the filter is also made of a hydrophilic material, so that the filter element can be more reliably reduced from being clogged with oil.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  In FIG. 1, the code | symbol 1 shows the airtight container comprised in the vertical cylinder standingly arranged from the floor surface 2. As shown in FIG.

  The inside 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.

  A supply port 6 for introducing water to be treated containing oil and solid particle components into the upstream separation chamber 4 is provided in the upper part of the upstream separation chamber 4. By providing in the tangential direction when viewed from the axial direction, the water to be treated introduced from the supply port 6 is configured to swivel around the axis of the closed vessel 1 in the front separation chamber 4.

Also, a metal mesh layer 7 is provided in a portion below the supply port 6 in the front separation chamber 4, and a support provided with a through hole in the center below the metal mesh layer 7. A plate 8 is provided, and a cylindrical coarsening element 9 is provided on the lower surface of the support plate 8, and the water to be treated flowing down in the preceding separation chamber 4 causes the coarsening element 9 to flow inside. It is comprised so that it may pass outward from.

  The coarsening element 9 in the upstream separation chamber 4 is composed of so-called hydrophilic fibers having a strong interaction with water.

  Furthermore, the upstream separation chamber 4 is provided with an outlet 10 for water to be treated at the bottom thereof, that is, above the partition plate 3, and below the ceiling plate 11 in the upstream separation chamber 4. An oil extraction port 12 that opens to the bottom and an oil extraction port 13 that opens to the lower side of the support plate 8 are provided.

  On the other hand, at the top of the rear separation chamber 5, that is, below the partition plate 3, an inlet for introducing water to be treated from the discharge port 10 in the front separation chamber 4 into the rear separation chamber 5. 14 is provided.

Further, a support plate 15 having a through-hole at the center is provided in the downstream separation chamber 5 at a position below the inlet 14, and a cylindrical rough plate is provided on the lower surface of the support plate 15. A granulating element 16 is provided, and the water to be treated flowing through the latter separation chamber 5 passes through the coarsening element 16 outward from the inside thereof.

  The coarsening element 16 in the subsequent separation chamber 5 is also composed of so-called hydrophilic fibers having a strong interaction with water, like the coarsening element 9 in the preceding separation chamber 4.

  Furthermore, the downstream separation chamber 5 is provided with a discharge port 17 for water to be treated at the bottom thereof, an oil extraction port 18 that opens below the partition plate 3, and the support plate 15. An oil extraction port 19 that opens to the lower side is provided.

  In this case, the coarsening element 9 in the preceding separation chamber 4 has a relatively coarse eye such that its eyes are, for example, 50 microns, but the coarsening element 16 in the latter separation chamber 5 is The eyes are fine, for example, 2 microns.

  Each of the oil extraction ports 12, 13, 18, 19 is provided with on-off valves 12a, 13a, 18a, 19a.

  The solid particle component contained in the water to be treated is separated by filtration between the discharge port 10 from the preceding separation chamber 4 and the inlet 14 to the latter separation chamber 5. A filter 20 is provided.

  The filter 20 is configured as shown in FIG.

  That is, the filter 20 includes a main body 20c having an inlet 20a connected to the discharge port 10 and an outlet 20b connected to the inflow port 14, and a cylindrical filter detachably attached to the main body 20c with a bolt 20d. An element 20e and a cover case 20f that is detachably attached to the main body 20c so as to seal the entire filter element 20e. Water to be treated from the inlet 20a moves the filter element 20e from the inside to the outside. After passing, it is configured to exit from the exit 20b.

  In this case, the filter element 20e in the filter 20 is composed of a so-called hydrophilic fiber having a strong interaction with water, like the both coarsening elements 9 and 16, and the filter. For example, if the grain of the coarsening element 16 in the rear separation chamber 5 is 2 microns, the coarsening element in the rear separation chamber 5 may be 1 to 2 microns. Same as 16 eyes or smaller.

  In this configuration, the water to be treated containing oil and solid particle components is first supplied tangentially from the supply port 6 into the pre-stage separation chamber 4 and swirled in the pre-stage separation chamber 4, thereby generating large oil droplets. A part is separated so as to float toward the top in the preceding separation chamber 4.

  Next, when passing through the metal mesh 7 incorporated in the preceding separation chamber 4, the oil droplets partially aggregate each other and become large oil droplets, and toward the top in the preceding separation chamber 4. Separate to surface.

  Subsequently, the oil droplets in the water to be treated are agglomerated and coarsened by passing through the coarsening element 9 incorporated in the preceding separation chamber 4, and then the coarsening element by the hydrophilic fibers. Separating quickly without adhering to 9, it separates so as to float toward the top of the front separation chamber 4 and the lower surface of the support plate 8.

  The treated water from which oil has been separated in the upstream separation chamber 4 in this way reaches the filter 20 through the discharge port 10 at the bottom of the upstream separation chamber 4, and is filtered by the filter element 20 c in the filter 20. As a result, the solid particle component contained in the water to be treated is separated and removed.

  In this case, since the filter element 20c in the filter 20 is a hydrophilic fiber, it is possible to reliably reduce the occurrence of clogging due to the oil adhering to the filter element 20c.

  Next, the water to be treated that has flowed out of the filter 20 flows into the rear separation chamber 5 from the inlet 14, and passes through the fine graining element 16 built in the rear separation chamber 5. The fine oil droplets in the water to be treated are agglomerated and coarsened, and then quickly separated without adhering to the coarsening element 16 by the hydrophilic fibers, and the top and support plate in the rear separation chamber 5 15 so that it floats toward the lower surface of 15.

  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 8, 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 15, the on-off valves 12 a, 13 a, 18 a, 19 a at the respective oil extraction ports 12, 13, 18, 19 are opened. By opening, it is discharged to the outside.

  According to the experiment using the apparatus having the above-described configuration, when water to be treated having an oil concentration of about 2400 to 3400 ppm is supplied to the front separation chamber 4, the water to be treated discharged from the rear separation chamber 5. It was possible to reduce the oil content concentration to about 7 to 9 ppm.

  By the way, in the said experiment, the to-be-processed water discharged | emitted from the discharge port 10 in the said front | former stage separation chamber 4 is introduce | transduced into the said latter stage | paragraph separation chamber 5 as it is from the inflow port 14 without filtering. The oil concentration in the water to be treated discharged from the outlet 17 of the latter separation chamber 5 could only be lowered to about 30 ppm.

  Therefore, the filter 20 only separates the solid particle component in the water to be treated and does not separate the oil. By using the filter 20, the oil concentration in the water to be treated is reduced. Further, it was found that it can be further reduced.

  In addition, as described above, each of the coarsening elements 9 and 16 and the filter element 20c are not limited to hydrophilic fibers, and may be those obtained by hydrophilizing hydrophobic fibers, or hydrophilic. Alternatively, the film may be formed with an infinite number of micropores.

It is a vertical front view which shows embodiment. It is an expansion vertical front view of the filter used for the said embodiment.

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 9 Coarse graining element 10 Drainage port of to-be-processed water 14 Inflow port of to-be-processed water 16 Fine graining Element 17 Discharged water outlet 12, 13, 18, 19 Oil extraction port 20 Filter 20e Filter element

Claims (5)

A pre-stage separation chamber containing a relatively coarse-grained element and a post-stage separation chamber containing a fine-grained coarser element than the coarse element in the pre-stage separation chamber, In the oil / water separator configured to supply the treated water to the former separation chamber and then to send the treated water discharged from the former separation chamber to the latter separation chamber,
An oil-water separator comprising a filter configured to separate the solid particle component contained therein by filtering the water to be treated from the preceding stage separation chamber to the latter stage separation chamber through a filter element. .   The inside of the vertical sealed container is partitioned by a partition plate into an upper front separation chamber and a lower rear separation chamber, and a coarser graining element is provided in the front separation chamber. In the former stage separation chamber, the water to be treated supplied from the supply port at the top thereof is configured to be discharged from the outlet provided below after passing through the coarsening element in the former stage separation chamber. A coarser grain element that is finer than the coarser grain element in the preceding stage separation chamber is provided in the latter stage separation chamber, and the water to be treated flowing into the latter stage separation chamber from the inlet at the upper part thereof is separated in the latter stage separation chamber. After passing through the coarsening element in the chamber, it is configured to discharge from a discharge port provided therebelow. A filter that separates the solid particle component contained therein by filtering the water to be treated from the discharge port of the separation chamber to the inlet of the subsequent separation chamber by a filter element, is separated from the sealed container. An oil-water separator characterized by comprising: In the description of the claim 1 or 2, the filter element in the filter is, the or a filter element in the same order as the roughening elements in the subsequent stage separation chamber, or from roughening elements in the rear stage separation chamber An oil-water separator characterized by a small filter element. 4. The oil / water separator according to any one of claims 1 to 3, wherein the coarsening element in the latter separation chamber is a hydrophilic material.   The oil-water separator according to any one of claims 1 to 4, wherein the filter element in the filter is a hydrophilic material.

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