WO2005026061A1 - Method for removal of fat and oil from stickwater by use of uf-filter - Google Patents

Method for removal of fat and oil from stickwater by use of uf-filter Download PDF

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Publication number
WO2005026061A1
WO2005026061A1 PCT/NO2004/000273 NO2004000273W WO2005026061A1 WO 2005026061 A1 WO2005026061 A1 WO 2005026061A1 NO 2004000273 W NO2004000273 W NO 2004000273W WO 2005026061 A1 WO2005026061 A1 WO 2005026061A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
stickwater
fat
oil
circulation
Prior art date
Application number
PCT/NO2004/000273
Other languages
French (fr)
Norwegian (no)
Inventor
Tom Sirnes
Odd Henning Sirnes
Original Assignee
Membranteknikk As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Membranteknikk As filed Critical Membranteknikk As
Publication of WO2005026061A1 publication Critical patent/WO2005026061A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B13/00—Recovery of fats, fatty oils or fatty acids from waste materials
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes

Definitions

  • This invention relates to a method for removing fat and oil from stickwater by the use of a UF-filter. More particularly it concerns a method for defatting stickwater, in which the stickwater is circulated through a UF-filter which is particularly fat-repellent.
  • a UF-filter is meant, in this context, a screen cloth material.
  • the stickwater contains a portion of dry matter in the order of 10 per cent by weight, water, salt and a relatively small portion of oil and fat.
  • the stickwater is subjected to a concentrating process, which may comprise, according to the prior art, reducing.
  • a concentrating process which may comprise, according to the prior art, reducing.
  • the reducing of stickwater is energy-demanding. Therefore, a method for concentrating stickwater by means of filtration has been developed and shows promising results.
  • nanofiltration In this method for concentrating stickwater, so-called nanofiltration is used.
  • nano iltration (NF-filter) particles that are larger than 200-600 daltons are retained in the filter.
  • practical utilization of the method is prevented by the fact that a nanofilter of this kind becomes clogged with fat and oil that are present in the stickwater.
  • the invention has as its object to remedy the drawbacks of the prior art.
  • ultrafiltration ultrafiltration particles that are larger than approximately 5000 daltons are retained.
  • a UF-filter which is made in such a way that it attracts water but repels oil and fat in order to separate oil and fat from the stickwater.
  • the stickwater passing through the UF-filter contains the solids portion.
  • This oil- and fat-repellent property is obtained by forming the UF-filter from an oleophobic material, that is to say that the wetting angle between the filter material and a drop of water is small, for example less than 20 degrees. It is of advantage for the wetting angle to be less than 10 degrees .
  • PAN polyacrylonitrile
  • This material has proved to be very oleophobic .
  • a filter of this kind has the property, known in itself, of being hydrophilic, that is to say that water is attracted to the filter material whereas oil and fat is repelled.
  • stickwater is fed into the filter loop and repeatedly circulated through the UF-filter, water and solids passing through the UF-filter material.
  • the process makes the portion of fat and oil in the circulating stickwater concentrate.
  • Stickwater having a relatively high content of fat and oil is bled from the filter loop at a rate which is controlled by the content of fat and oil present in the circulated stickwater.
  • the portion of fat and oil in the circulating stickwater is determined by means of, for example, density-metering.
  • a further advantageous feature of the invention is that dioxins are removed from the stickwater together with fat and oil. This favourable effect involves that it can be desirable to use the invention even if the subsequent process step is not adversely affected by the stickwater 's content of fat and oil.
  • Figure 1 shows a principle drawing of a UF filtering plant for stickwater, arrows indicating the directions of flow of the stickwater.
  • the reference numeral 1 identifies a UF filtering plant for stickwater.
  • the UF filtering plant 1 comprises a UF-filter 2 formed of an oleophobic material and a circulation pump 4.
  • the circulation pump 4 is connected, at its outlet side, to the inlet of the UF-filter 2 by means of a first circulation pipeline 6, whereas a second circulation pipeline 8 is connected between the circulation outlet of the UF-filter 2 and the inlet of the circulation pump 4.
  • An outlet pipe 10 is connected to the filter outlet of the UF-filter 2 and extends to a subsequent process not shown.
  • a densimeter 12 connected to the second circulation pipeline 8, is arranged to measure the density of the circulation fluid.
  • a supply pipe 14 is connected via a high-pressure pump 16 to the first circulation pipe 6, and a bleed pipe 18 is connected to the second circulation pipe 8 through a bleed valve 20.
  • Stickwater which is to be defatted flows in through the supply pipe 14, the high-pressure pump 16 and the first supply pipe 6 to the UF-filter 2.
  • a portion of the stickwater flows through the filter material of the UF-filter 2 and out through the outlet pipe 10, whereas the rest of the stickwater flows out of the UF-filter through the second circulation pipeline 8 and is circulated back to the UF- filter 2 by means of the circulation pump 4 and the first circulation pipe 6.
  • the purified stickwater flows out through the outlet pipe 10 at a rate determined by the through-put capacity of the UF- filter material.
  • the content of oil and fat in the stickwater concentrates .
  • the densimeter 12 outputs a signal through a signal connection 22 to the bleed valve 20.
  • the bleed valve 20 opens and stickwater with a relatively high concentration of oil and fat flows out through the bleed pipe 18.
  • New stickwater flows in through the supply pipe 14 and the high-pressure pump 16 at a rate controlled by the outflow rates through the outlet pipe 10 and by the bleed pipe 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Filtration Of Liquid (AREA)
  • Fats And Perfumes (AREA)

Abstract

A method for removing oil and fat from stickwater in a feed and bleed filter loop comprising a filter (2), a circulation pump (4) and circulation pipes (6, 8), wherein the stickwater is circulated through a UF-filter (2), the filter material thereof having a wetting angle for water which is less than 20 degrees.

Description

METHOD FOR REMOVAL OF OIL AND FAT FROM STICKWATER BY USE OF UF-FILTER
This invention relates to a method for removing fat and oil from stickwater by the use of a UF-filter. More particularly it concerns a method for defatting stickwater, in which the stickwater is circulated through a UF-filter which is particularly fat-repellent. By a UF-filter is meant, in this context, a screen cloth material.
In the production of fishmeal the fractions fishmeal, fish oil and stickwater are produced. The stickwater contains a portion of dry matter in the order of 10 per cent by weight, water, salt and a relatively small portion of oil and fat.
In order to increase the solids content of the stickwater, the stickwater is subjected to a concentrating process, which may comprise, according to the prior art, reducing. The reducing of stickwater is energy-demanding. Therefore, a method for concentrating stickwater by means of filtration has been developed and shows promising results.
In this method for concentrating stickwater, so-called nanofiltration is used. In nano iltration (NF-filter) particles that are larger than 200-600 daltons are retained in the filter. However, practical utilization of the method is prevented by the fact that a nanofilter of this kind becomes clogged with fat and oil that are present in the stickwater.
The invention has as its object to remedy the drawbacks of the prior art.
The object is realized in accordance with the invention through the features specified in the description below and in the following Claims.
With the aim of preventing subsequent processes from being affected by the stickwater1 s content of fat and oil, for example the process mentioned above, fat and oil are removed from the stickwater by means of so-called ultrafiltration. In ultrafiltration (UF-filter) particles that are larger than approximately 5000 daltons are retained.
According to the invention, there is used a UF-filter which is made in such a way that it attracts water but repels oil and fat in order to separate oil and fat from the stickwater. The stickwater passing through the UF-filter contains the solids portion.
This oil- and fat-repellent property is obtained by forming the UF-filter from an oleophobic material, that is to say that the wetting angle between the filter material and a drop of water is small, for example less than 20 degrees. It is of advantage for the wetting angle to be less than 10 degrees .
For example, polyacrylonitrile (PAN) can be used. This material has proved to be very oleophobic . A filter of this kind has the property, known in itself, of being hydrophilic, that is to say that water is attracted to the filter material whereas oil and fat is repelled.
By installation of a UF-filter of this kind into a so-called feed and bleed filter loop, stickwater is fed into the filter loop and repeatedly circulated through the UF-filter, water and solids passing through the UF-filter material. The process makes the portion of fat and oil in the circulating stickwater concentrate. Stickwater having a relatively high content of fat and oil is bled from the filter loop at a rate which is controlled by the content of fat and oil present in the circulated stickwater.
The portion of fat and oil in the circulating stickwater is determined by means of, for example, density-metering.
A further advantageous feature of the invention is that dioxins are removed from the stickwater together with fat and oil. This favourable effect involves that it can be desirable to use the invention even if the subsequent process step is not adversely affected by the stickwater 's content of fat and oil.
In what follows is described a non-limiting example of a preferred method which is visualized in the accompanying drawing, in which:
Figure 1 shows a principle drawing of a UF filtering plant for stickwater, arrows indicating the directions of flow of the stickwater.
In the drawing the reference numeral 1 identifies a UF filtering plant for stickwater. The UF filtering plant 1 comprises a UF-filter 2 formed of an oleophobic material and a circulation pump 4. The circulation pump 4 is connected, at its outlet side, to the inlet of the UF-filter 2 by means of a first circulation pipeline 6, whereas a second circulation pipeline 8 is connected between the circulation outlet of the UF-filter 2 and the inlet of the circulation pump 4.
An outlet pipe 10 is connected to the filter outlet of the UF-filter 2 and extends to a subsequent process not shown.
Thus, the UF-filter 2, circulation pump 4 and circulation pipes 6 and 8 form a circulation loop.
A densimeter 12 connected to the second circulation pipeline 8, is arranged to measure the density of the circulation fluid.
A supply pipe 14 is connected via a high-pressure pump 16 to the first circulation pipe 6, and a bleed pipe 18 is connected to the second circulation pipe 8 through a bleed valve 20.
Stickwater which is to be defatted, flows in through the supply pipe 14, the high-pressure pump 16 and the first supply pipe 6 to the UF-filter 2. A portion of the stickwater flows through the filter material of the UF-filter 2 and out through the outlet pipe 10, whereas the rest of the stickwater flows out of the UF-filter through the second circulation pipeline 8 and is circulated back to the UF- filter 2 by means of the circulation pump 4 and the first circulation pipe 6.
The purified stickwater flows out through the outlet pipe 10 at a rate determined by the through-put capacity of the UF- filter material. As the water is circulated through the UF- filter, the content of oil and fat in the stickwater concentrates . When the circulating stickwater has reached a predetermined oil and fat concentration, the densimeter 12 outputs a signal through a signal connection 22 to the bleed valve 20. The bleed valve 20 opens and stickwater with a relatively high concentration of oil and fat flows out through the bleed pipe 18.
New stickwater flows in through the supply pipe 14 and the high-pressure pump 16 at a rate controlled by the outflow rates through the outlet pipe 10 and by the bleed pipe 18.

Claims

C A I M S
1. A method for removing fat and oil from stickwater in a feed and bleed filter loop comprising a filter (2), a circulation pump (4) and circulation pipes (6, 8), charac t er i z ed in that the stickwater is circulated through a UF-filter (2) , in which the filter material has a wetting angle for water which is less than 20 degrees.
2. A method in accordance with claim 1, charac - t er i z ed in that the stickwater is circulated through a UF-filter retaining particles that are larger than 5000 daltons.
3. Use of a UF-filter for separating oil and fat from stickwater.
4. Use of a UF-filter whose filter material has a wetting angle for water which is less than 20 degrees, for the purpose according to claim 3.
5. Use of a UF-filter whose filter material retains particles that are larger than 5000 daltons, for the purpose according to claim 3.
PCT/NO2004/000273 2003-09-16 2004-09-16 Method for removal of fat and oil from stickwater by use of uf-filter WO2005026061A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20034131 2003-09-16
NO20034131A NO20034131L (en) 2003-09-16 2003-09-16 Procedure for removing grease and oil from glue water using UF filter

Publications (1)

Publication Number Publication Date
WO2005026061A1 true WO2005026061A1 (en) 2005-03-24

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PCT/NO2004/000273 WO2005026061A1 (en) 2003-09-16 2004-09-16 Method for removal of fat and oil from stickwater by use of uf-filter

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NO (1) NO20034131L (en)
WO (1) WO2005026061A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023031301A1 (en) * 2021-09-01 2023-03-09 Kitin Antarktis As Stabilizing stickwater deriving from creatures living in a body of water

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56152781A (en) * 1980-04-30 1981-11-26 Toyota Motor Corp Purifying and reproducing method for oil-containing waste fluid
DE3904698A1 (en) * 1989-02-16 1990-08-23 Krupp Gmbh Method for processing animal raw materials
US4966733A (en) * 1979-06-21 1990-10-30 The Meat Industry Research Institute Of New Zealand Rendering processes
US5173190A (en) * 1992-04-06 1992-12-22 Picek Charles R Reconditioning and reuse of chilled water for poultry and food processing
US5254253A (en) * 1991-11-19 1993-10-19 Zenon Environmental Inc. Modular shipboard membrane bioreactor system for combined wastewater streams

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4966733A (en) * 1979-06-21 1990-10-30 The Meat Industry Research Institute Of New Zealand Rendering processes
JPS56152781A (en) * 1980-04-30 1981-11-26 Toyota Motor Corp Purifying and reproducing method for oil-containing waste fluid
DE3904698A1 (en) * 1989-02-16 1990-08-23 Krupp Gmbh Method for processing animal raw materials
US5254253A (en) * 1991-11-19 1993-10-19 Zenon Environmental Inc. Modular shipboard membrane bioreactor system for combined wastewater streams
US5173190A (en) * 1992-04-06 1992-12-22 Picek Charles R Reconditioning and reuse of chilled water for poultry and food processing

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ADVANCES IN FILTRATION AND SEPARATION TECHNOLOGY, vol. 15, 2002, pages 563 - 575 *
DATABASE CAPLUS [online] ERIKSSON P.K. ET AL.: "Hydrophilic ultrafiltration and microfiltration membranes", XP002983290, accession no. STN Database accession no. 2004:719789 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 035 3 March 1982 (1982-03-03) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023031301A1 (en) * 2021-09-01 2023-03-09 Kitin Antarktis As Stabilizing stickwater deriving from creatures living in a body of water

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NO20034131L (en) 2005-03-17

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