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WO1991008175A1 - Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede - Google Patents

Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede Download PDF

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Publication number
WO1991008175A1
WO1991008175A1 PCT/DK1990/000314 DK9000314W WO9108175A1 WO 1991008175 A1 WO1991008175 A1 WO 1991008175A1 DK 9000314 W DK9000314 W DK 9000314W WO 9108175 A1 WO9108175 A1 WO 9108175A1
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WO
WIPO (PCT)
Prior art keywords
line
waste water
vessel
inner vessel
leading
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/DK1990/000314
Other languages
English (en)
Inventor
Poulsen Karsten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKVAGAD AS
Original Assignee
AKVAGAD 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 AKVAGAD AS filed Critical AKVAGAD AS
Publication of WO1991008175A1 publication Critical patent/WO1991008175A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation

Definitions

  • the present invention relates to a method for the purification of waste water making use of flotation and an apparatus for carrying out this method.
  • the waste water being subjected to purification may practical ⁇ ly be any kind of waste water, i. a. the types of waste water coming from the sources stated in the following paragraph.
  • waste water front food industry plants e. g. waste water from slaughterhouses and plants for treating or working up/or processing meat
  • waste water front food industry plants e. g. waste water from slaughterhouses and plants for treating or working up/or processing meat
  • the owner or the owners of one or more such plants have been directed to pay increasing purification duties so that the owner or the owners of one or more such plants have found it more attractive to purify waste water from the plant in question or the plants in question.
  • Chemical precipitation is one of the methods often being used with advantage for treating e. g. industrial waste water of some origin whether or not it involves waste water having a content of heavy metal ions or organic substances, including proteins from the food industry.
  • the object of the present invention is to indicate (A) a method for the purification of waste water making use of flotation in which method not only a removal of particles hav ⁇ ing a density being great or small, possibly very great or small with respect to the density of water takes place with a high efficiency but also a removal of suspended substance in which the particles have a density being close to, being ap ⁇ proximately the same as or being the same as the density of water takes place with an improved or high efficiency and (B) an apparatus for carrying out this method.
  • Part (A) of the indicated object of the present invention is achieved by a method, characterized in that there is performed a leading-away of the purified liquid from a region being si- tuated below the surface of the liquid and above the lower sludge take-off, preferably centrally in the outer vessel.
  • the method of the present invention differs from the known me ⁇ thods for purification of waste water making use of flotation in the manner in which the purified liquid is being led away, viz. being led away without being in contact with or having been in contact with the sludge resulting from the flotation - which sludge seeks up to and settles on the surface of the li ⁇ quid - in contradistinction to the taking-off of purified li- quid in contact with the sludge resulting from the flotation - which sludge as mentioned seeks up to and settles on the sur ⁇ face of the liquid - in carrying out the known methods for pu ⁇ rification of waste water making use of flotation.
  • the su ⁇ spended particles are separated in a rising stream and a de ⁇ scending stream corresponding to particles having a density being less than, respectively greater than the density of water.
  • the stream of liquid will preferably rise and therefore the particles having the same density as the density of water will also flotate during the carrying-out of the method of the present invention because there is no take-off for the puri ⁇ fied liquid at the surface of the liquid contents of the appa- ratus being used in carrying out the method.
  • a result of this is that in general by means of the method of the present in ⁇ vention there is achieved a better removal of suspended sub ⁇ stance which result of this preferably applies to a liquid in which there are suspended particles having approximately the same density as the density of water.
  • Part (B) of the indicated object of the present invention is achieved by an apparatus, characterized in that it contains means for leading-away of liquid from the central region of the outer vessel.
  • the apparatus of the present invention differs from the known apparatuses for carrying out methods of purification of waste water making use of flotation by the placing of the take-off for the purified liquid.
  • the placing of the take-off has the result that in contradistinction to the taking-off of purified water in the known apparatuses it is avoided to take off the purified water at the top of the flotation plant.
  • the particles of the suspended substances or, if you like, the suspended particles are separated by the leading-away means in a rising stream and a descending stream corresponding to particles having a den ⁇ sity being less than, respectively greater than the density of water.
  • the stream of liquid will preferably rise and therefore the particles having the same density as the density of water will also flotate in the apparatus of the present invention because there is no take- off for the purified liquid at the surface of the liquid con ⁇ tents of the apparatus.
  • a result of this is that in general by means of the use of the apparatus of the present invention there is achieved a better removal of suspended substance which result of this preferably applies to a liquid in which there are suspended particles having approximately the same density as the density of water.
  • apparatus contains an outer vessel and an inner vessel which vessels each are made up of a top part and a bottom part, this bottom part of the outer and/or inner ves ⁇ sel possibly being tapered, a leading-to line - possibly con ⁇ taining one or more treatment devices -for waste water, one or more devices for leading-away of purified liquid, a sludge scraper in the upper part of the apparatus, a line for leading-away of sludge from the upper part of the apparatus, a line for leading-away of sludge from the lower part of the ap ⁇ paratus:
  • the device or the devices for leading-away of purified li ⁇ quid issue from the upper part of the space in the collecting device for purified liquid which device or which devices for leading-away of purified liquid end in one or more level control devices which device or which devices for level control are placed at a level above the boundary in which the collecting device ends, preferably above the level of the beginning of the collecting device,
  • the wall of the collecting device has a non-circular cross section, this non-circular cross section possibly being wholly or partly a polygonal cross section or being a circular cross section,
  • the wall of the top part and/or bottom part of the inner vessel has a non-circular cross section, this non- circular cross section possibly being wholly or partly a polygonal cross section or being a circular cross section,
  • the wall of the top part and/or bottom part of the outer vessel has a non-circular cross section, this non- circular cross section possibly being wholly or partly a polygonal cross section or being a circular cross section,
  • the shell angle being formed (I) by a line being si ⁇ tuated within the shell and also being situated in a plane containing the line in the middle or the centre line of the apparatus and (II) by the line in the middle or the centre line of the apparatus is situated within the inter ⁇ val 30-80"
  • the shell angle is situated within the interval 40-70° and more preferred that the shell angle is situated within the interval 50- 60°, or that the shell angle has the value of 60°, and/or
  • the width of the shell measured from the boundary of the shell, in particular from the edge of the shell, to the wall of the outer or inner vessel in a plane being perpendicular to the line in the middle or the centre line of the apparatus and along a line - the measuring line - being perpendicular to the line in the middle or the centre line of the apparatus makes up 60-100%, that is preferred that its width makes up 60-90%, more preferred that its width makes up 60-80%, and most preferred that its width makes up 60-70% of the distance between the inner wall of the outer vessel and the inner vessel wall facing the outer vessel - the vessel distance - that the shell when its width as defined here makes up 100% of the vessel distance has been provided with holes the function of which is to let water pass the shell, and that the shell when its width as defined here makes up 60% and up to 100% of the vessel distance has been provided with or may have been provided with holes the function of which is to let water pass the shell,
  • the apparatus of the present invention which apparatus contadtos a treatment device in the leading-to line for waste water that this treatment device is a device for mixing a precipitant; in- to the waste water as it has been found that the use of ant ap ⁇ paratus of the present invention having a device for mixing precipitant into the waste water stream and not just having a device for introducing precipitant into the waste water stream leads to an improved result of the carrying-through of t__a pu- rification of waste water when carrying out the method of the present invention for purification of waste water making use of flotation.
  • this treat ⁇ ment device is a device for mixing a pH adjusting agent into the waste water, such as a device for mixing of an alkaline material, such as lye, because by using such an apparatus when carrying through the purification of waste water when carrying out the method of the present invention for purification of waste water making use of flotation one gets a possibilty - in an appropriate manner - of adjusting the pH value of the li ⁇ quid, including the pH value of the taken-off purified l ⁇ ig ⁇ d, which last mentioned pH value has to be situated within a de- finite interval indicated hereinbelow when leading out i ⁇ ro a recipient, such as a stream or a lake, possibly via sewerage system.
  • this treat ⁇ ment device is a device for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water as it has been found the the use of an apparatus of the present inven ⁇ tion having a device for mixing pressurized water with a floc- culating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water stream leads to an improved result of the carrying-through of the purification of waste water when carrying out the method of the present inven ⁇ tion for purification of waste water making use of flotation.
  • Introducing the flocculating agent into the waste water stream - also called the main water stream - in the manner just indicated here may in typical cases with respect to introducing the flocculating agent in waste water stream before or after introducing the pressurized water into the waste water stream result in an increased reduction of COD (from: Chemical Oxygen Demand) amounting to 40-80 mg/1.
  • COD from: Chemical Oxygen Demand
  • the first treatment device in the direction of flow of the waste water is a device for mixing a precipitant into the waste water
  • the second treatment device in the direction of flow of the waste water is a device for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water as it has been found in practice that the use of an appa ⁇ ratus of the present invention having the two just indicated treatment devices in the just indicated order of succession leads to an improved result of the carrying- through of the purification of waste water by carrying out the method of the present for purification of waste water making use of flotation.
  • the first treatment device in the direction of flow of the waste water is a device for mixing a precipitant into the waste water
  • the second treatment device in the direction of flow of the waste water is a device for mixing a pH adjusting agent into the waste water, preferably a device for mixing an alkaline material, such as lye, and
  • the third treatment device in the direction of flow of the waste water is a device for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water,
  • Aluminium sulphate ferric chloride, calcium hydroxide, hydro ⁇ gen sulphide, xanthates, sodium hydroxide, bentonite, kaoline, starch, polyacylamide(s), lignin sulphonic acid, dodecylben- zensulphonic acid, and glucose trisulphate.
  • the apparatus of the present invention there may be used one or more precipitants that typically are being dosed in concentrations selected among the following, as ex ⁇ amples indicated concentrations: 40-2,000 mg/1, especially 10- 1,000 mg/1.
  • flocculating agents also called floc- culants, selected among the • following flocculating agents indicated as examples:
  • Cationic polyelectrolytes such as poly- diallyldimethylammonium
  • anionic polyelectrolytes such as polyacrylic acid
  • non-ionic polymers such as polyacyla- mide(s)
  • polyethylenoxide respec ⁇ tively the use of the apparatus of the present invention there may be used one or more flocculating agents that typically are being dosed in concentrations selected among the following concentrations indicated as examples: 0.4-20 mg/1, especially 1-10 mg/1.
  • one or more pH adjusting agents are being used, e. g. an alkaline material, such as lye, that are ty ⁇ pically being dosed in concentrations being selected in such a way that the pH value of the water being led out is situated within the interval within which the pH value has to be si ⁇ tuated in a number of countries, i. a. DK, viz: 6-8.
  • an alkaline material such as lye
  • the pH value of the waste water to be purified may be si ⁇ tuated in the interval 4-9.
  • fig. 1A shows an apparatus of the present invention having no shell between the outer vessel and the inner ves ⁇ sel but having a leading-to line for waste water of which leading-to line treatment devices indicated below in some detail form part, having a leading- away line for purified liquid, having a leading-away line for top sludge, and having a leading-away line for bottom sludge; the part of the apparatus - being made up of the outer vessel and the inner vessel, the collecting device with leading-away line and level controller for purified liquid and the scraper for top sludge - being shown in a section along a plane containing the centre line of the outer vessel and being situated in the plane of the drawing,
  • fig. IB shows the same as fig. 1A but with other treatment devices indicated below in some detail which treat ⁇ ment devices form part of the leading-to line for waste water and with the motor of the scraper for top sludge shown as a symbol of this scraper in its entirety,
  • fig. IC shows a view seen from above of the vessel part of the apparatus with scraper, this apparatus being shown in fig. 1A,
  • fig. ID shows an enlarged view - as far as the greater part is concerned in a section - of the mixing chamber forming part of the waste water leading-to line for ⁇ ming part of the apparatus shown in fig. 1A,
  • fig. 2 shows the vessel part of the apparatus seen from above (a scraper has been removed),
  • fig. 3 shows the same as fig. IB but having a downward di- rected shell on the inner vessel in the space be ⁇ tween the outer vessel and the inner vessel,
  • fig. 4 shows a device for mixing precipitant into waste water which device may form part of the leading-to line for waste water, this leading-to line being shown in fig. IB, 2, and 3, fig. 5 shows a device for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water,
  • fig. 6 shows a device for producing pressurized water
  • fig. 7 shows the section A-A marked in fig. 2.
  • FIG. 1A there is shown an apparatus of the present inven ⁇ tion of which an outer vessel 5, an inner vessel 6 having an outflow device at the bottom and a collecting device 7 for pu ⁇ rified liquid with pertaining leading-away lines for purified liquid up to a level controller 10 - the collecting device 7 being connected to the inner vessel 6 - form part.
  • a line 1 for leading-to of waste water this line 1 having a tangential introduction 16 on the inner vessel 6, a line 2 for leading-away of purified liquid, a line 3 for lead- ing-away of top sludge, a line 4 for leading-away of bottom sludge.
  • the line 1 for leading-to of waste water includes a mixing chamber 25 - being shown as far as the greater part is concerned in a section and on an enlarged scale in fig. ID - into which mixing chamber there has been introduced a pH sensor 15C.
  • a line 11 for leading-to of precipitant To this mixing chamber lead a line 11 for leading-to of precipitant, a line 12 for leading-to of a pH adjusting agent, a line 13 for leading-to of flocculating agent, and a line 14 for leading-to of pressurized water having a pressure of 6-9 atmospheres (cfr. fig. 6) which pressurized water comes from a device 24 for producing pressurized water.
  • To the device 24 for producing pressurized water leads in part a line from a pump 17 being supplied with purified liquid from the level controller 10, in part a line for air under pressure from a pump 18.
  • the su- spended particles are separated i. a. by the collecting device 7 and leading-away lines connected to this device into a ris ⁇ ing stream and a descending stream corresponding to particles having a density being less than, respectively greater than the density of water.
  • the stream of liquid will preferably rise and therefore the particles having the same density as the density of water will also flotate in the apparatus of the present invention because there is no take-off for the purified liquid at the surface of the liquid contents of the apparatus.
  • a result of this is that in general there is achieved a better removal of suspended substance which result of this preferably applies to a liquid in which there are suspended particles having approx ⁇ imately the same density as the density of water.
  • the apparatus of the present invention has the same structure as in fig. 1A though other treatment devices form part of the waste water leading-to line 1 in the apparatus illustrated in fig. IB than in the apparatus illustrated in fig. 1A.
  • a device 21 for mixing precipitant into the waste water which device has been illustrated in fig. 4 a device 22 for mixing a pH adjusting agent into the waste water, and a device 23 for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water which device has been illustrated in fig. 5 form part.
  • In fig. 2 A-A indicates a section that has been shown in fig. 7.
  • In fig. 2 a is the radius of a circle determining a part of the boundary of the openings shown. This radius is typically 200 mm.
  • b is the width of an overflow canal, b is typically 200 mm.
  • c is the distance between l's centre line and the axis of symmetry of the vessel part of the apparatus. c is typically 575 mm.
  • the apparatus of the present invention has the same structure as the apparatus of the present invention in fig. IB though further a downward directed shell 8B on the inner ves ⁇ sel and facing the space between the outer vessel and the in ⁇ ner vessel forms part of the apparatus of the present inven ⁇ tion illustrated in. fig. 3.
  • the other designations of reference in fig. 3 refer to the same items as in fig. IB.
  • a device for mixing a precipitant into waste water is shown which device may form part of the leading-to line for waste water shown in fig. IB, 2, and 3.
  • the numeral 19 is the end part of a pipe for leading-to of precipitant which pipe end part has been provided with holes for the pas ⁇ sage of the precipitant out into the waste water. It is point ⁇ ed out that the size of the holes 19 is dependent on the plac- 5 ing of the end part 19 in the stream.
  • fig. 4 is water a short designation for waste water.
  • fig. 5 there is shown a device for mixing pressurized water with a flocculating agent and for mixing the mixture of pres ⁇ surized water and flocculating agent into the waste water 15 which device may form part of the leading-to line for waste water shown in fig. IB, 2, and 3.
  • the numeral 20 is a device for pressure adjustment.
  • main water stream is a short designation for main waste water stream.
  • the device shown in fig. 5 for mixing of pressurized water with a flocculating agent and for mixing 25 the mixture of pressurized water and flocculating agent into the waste water may also form part of other apparatuses than the apparatus of the present invention.
  • fig. 6 there is shown a device for producing pressurized 30 . water, confer 24 in fig. 1A.
  • the numeral 14 refers to the same items as in fig.s 1A to 3.
  • the diameter of the vessel is typically 2,400 mm while the other measures in this section 35 are fixed by the proportions of the figure.
  • example 1 illustrates a method for purification of waste water making use of flotation carried out making use of an apparatus of the present invention having no shell in the space between the outer vessel 5 and the in ⁇ ner vessel 6, viz. an apparatus of the present in ⁇ vention of the type being illustrated in fig. 1A - i. e. having no device 23 for mixing pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water - and in fig. IB but having no device 23 for mixing of pressurized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating agent into the waste water,
  • example 2 illustrates a method for purification of waste water making use of flotation carried out making use of an apparatus of the present invention having no shell, respectively having a shell in the space between the outer vessel and the inner vessel, viz.
  • an apparatus of the present invention of the type being illustrate in fig. IB but having no device 23 for mixing pressurized water with a flocculating a- gent and for mixing the mixture of pressurized water and flocculating agent into the waste water, respec ⁇ tively
  • example 3 illustrates a method for purification of waste water making use of flotation carried out making use of an apparatus of the present invention having a shell in the space between the outer vessel 5 and the inner vessel 6 and having a device 23 for mixing pressur ⁇ ized water with a flocculating agent and for mixing the mixture of pressurized water and flocculating a- gent into the waste water, i. e. an apparatus of the present invention of the type illustrated in fig. 2 and fig. 3 respectively.
  • the treated water contains 0.05 g/1 of suspended substance and therefore less than the 0.12 g/1 that might be expected if the flotation plant were of the common type with taking-off of the purified liquid over an overflow.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Purification améliorée et simplifiée d'eaux résiduelles par flottation et appareil prévu à cet effet. Les eaux résiduelles peuvent contenir des particules en suspension ayant une densité presque égale à la densité de l'eau. Le liquide purifié est évacué à partir d'une région située au-dessous de la surface du liquide et au-dessus de l'envol de la boue inférieure, de préférence centralement dans la cuve extérieure (5) et non sur un bord à dent de scie. L'appareil peut contenir des cuves extérieure et intérieure (5 et 6), la cuve extérieure (6) peut contenir une cloche (7) ouverte au niveau de la partie inférieure, dotée de canaux d'évacuation orientés vers le haut destinés au liquide purifié. Des enveloppes (8A, 8B) orientées vers le bas, situées entre les cuves (5 et 6) facilitent la purification du liquide. L'amenée au conduit (1) peut être introduite tangentiellement sur la cuve intérieure (6). Dans l'amenée au conduit, on peut trouver des dispositifs (21, 22 et 23) conçus spécialement, destinés au prétraitement des eaux résiduelles. La purification et l'emploi de l'appareil permettent d'obtenir un liquide évacué bien plus pur que ce que l'on obtient à l'heure actuelle, même dans le cas de particules en suspension ayant un densité presque égale à la densité de l'eau.
PCT/DK1990/000314 1989-12-04 1990-12-03 Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede Ceased WO1991008175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK6101/89 1989-12-04
DK610189A DK610189D0 (da) 1989-12-04 1989-12-04 Fremgangsmaade til rensning af spildevand under anvendelse af flotation og apparat til udoevelse af denne fremgangsmaade

Publications (1)

Publication Number Publication Date
WO1991008175A1 true WO1991008175A1 (fr) 1991-06-13

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PCT/DK1990/000314 Ceased WO1991008175A1 (fr) 1989-12-04 1990-12-03 Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede

Country Status (3)

Country Link
AU (1) AU7897691A (fr)
DK (1) DK610189D0 (fr)
WO (1) WO1991008175A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2125970C1 (ru) * 1997-07-10 1999-02-10 Зарубин Михаил Прокопьевич Флотатор для очистки сточных вод "циклон-1" зарубина м.п.
US6251277B1 (en) * 1996-04-04 2001-06-26 Friesland Brands B.V. Method and device for purifying protein containing waste water
WO2003064327A1 (fr) * 2002-01-31 2003-08-07 Stewart Timothy L Procede de traitement d'eaux usees destine a eliminer des agents contaminants
US7332079B2 (en) * 2001-05-04 2008-02-19 Industrial Waste Water Services, Llc Floatation process for removal of heavy metal waste and associated apparatus
US7344647B2 (en) 2002-07-18 2008-03-18 Stewart Water Solutions, Ltd. Process for treating waste water to remove contaminants
US20130213391A1 (en) * 2010-01-06 2013-08-22 Stuart J. Ward Sugar aeration clarifier
CN115259463A (zh) * 2022-08-05 2022-11-01 广东水清环保科技有限公司 一种pcb综合废水的预处理方法
NO20220965A1 (en) * 2022-09-09 2024-03-11 Stauper Env As Flotation device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE38196C1 (fr) *
US3642617A (en) * 1970-01-29 1972-02-15 Fmc Corp Foam flotation concentrator
DE2358077A1 (de) * 1972-11-22 1974-05-30 Saint Gobain Techn Nouvelles Flotationsklaereinrichtung
US3966598A (en) * 1975-02-24 1976-06-29 Tenco Hydro/Aerosciences, Inc. Circular dissolved gas flotation system
GB1459195A (en) * 1973-11-23 1976-12-22 Portals Water Treatment Ltd Gas flotation purification of liquids

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE38196C1 (fr) *
US3642617A (en) * 1970-01-29 1972-02-15 Fmc Corp Foam flotation concentrator
DE2358077A1 (de) * 1972-11-22 1974-05-30 Saint Gobain Techn Nouvelles Flotationsklaereinrichtung
GB1459195A (en) * 1973-11-23 1976-12-22 Portals Water Treatment Ltd Gas flotation purification of liquids
US3966598A (en) * 1975-02-24 1976-06-29 Tenco Hydro/Aerosciences, Inc. Circular dissolved gas flotation system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6251277B1 (en) * 1996-04-04 2001-06-26 Friesland Brands B.V. Method and device for purifying protein containing waste water
RU2125970C1 (ru) * 1997-07-10 1999-02-10 Зарубин Михаил Прокопьевич Флотатор для очистки сточных вод "циклон-1" зарубина м.п.
US7332079B2 (en) * 2001-05-04 2008-02-19 Industrial Waste Water Services, Llc Floatation process for removal of heavy metal waste and associated apparatus
WO2003064327A1 (fr) * 2002-01-31 2003-08-07 Stewart Timothy L Procede de traitement d'eaux usees destine a eliminer des agents contaminants
US7344647B2 (en) 2002-07-18 2008-03-18 Stewart Water Solutions, Ltd. Process for treating waste water to remove contaminants
US20130213391A1 (en) * 2010-01-06 2013-08-22 Stuart J. Ward Sugar aeration clarifier
CN115259463A (zh) * 2022-08-05 2022-11-01 广东水清环保科技有限公司 一种pcb综合废水的预处理方法
NO20220965A1 (en) * 2022-09-09 2024-03-11 Stauper Env As Flotation device
WO2024054120A1 (fr) 2022-09-09 2024-03-14 Stauper Environment As Dispositif de flottation
NO348354B1 (en) * 2022-09-09 2024-12-02 Stauper Env As Flotation device

Also Published As

Publication number Publication date
DK610189D0 (da) 1989-12-04
AU7897691A (en) 1991-06-26

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