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Dokumentenidentifikation EP0956145 29.06.2006
EP-Veröffentlichungsnummer 0000956145
Titel METHODE ZUR MOLKEBEHANDLUNG
Anmelder Jolkin, Veikko, Lapinlahti, FI
Erfinder Jolkin, Veikko, Lapinlahti, FI
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 69735951
Vertragsstaaten AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LI, NL, PT, SE
Sprache des Dokument EN
EP-Anmeldetag 05.02.1997
EP-Aktenzeichen 979023793
WO-Anmeldetag 05.02.1997
PCT-Aktenzeichen PCT/FI97/00065
WO-Veröffentlichungsnummer 0097028890
WO-Veröffentlichungsdatum 14.08.1997
EP-Offenlegungsdatum 17.11.1999
EP date of grant 24.05.2006
Veröffentlichungstag im Patentblatt 29.06.2006
IPC-Hauptklasse B01D 61/58(2006.01)A, F, I, 20051017, B, H, EP
IPC-Nebenklasse C02F 1/44(2006.01)A, L, I, 20051017, B, H, EP   
IPC additional class A23J 1/20  (2006.01)  A,  L,  N,  20051017,  B,  H,  EP

Beschreibung[en]

It is the object of this invention to provide a method to treat whey, and according to the said method the separated whey is led to a pasteurizing apparatus, from there to a nano- and/or microfiltration unit, wherefrom the retentate part of the whey is transferred to be further processed and the permeate part is led elsewhere.

In the processes in foodstuff industry, waste water is created which is purified by leading it through nano- and/or microfilters. The whey that is created during the processing of milk in the cheese industry is saliferous, and it is led to a filtration unit for desalination. The permeate flowing out of the filtration unit is also wastewater, because its salt content is high. Such wastewaters are discharged as sewage e.g. to an industrial or a municipal sewage treatment plant. The prices for water and wastewater treatment are high, and great costs must be paid for large amounts of wastewater even if the wastewaters were almost clean.

The presently employed processes have an additional disadvantage: the potentially useful ingredients in the permeate are lost. In such cases, new corresponding ingredients may have to be bought for the process in order to replace the ingredients which were discharged as sewage along with the permeate. The recycling of the permeate back to the process does not at present necessarily yield satisfactory results, for the recycling may result in non-desired ingredients plugging the nanofiltration apparatus.

WO-A-9423586, EP-A-404425, US-A-3880755, US-A-5250182, ES-A-2007230 and WO-A-9222368 disclose the use of filtration such as nano-, micro- and reverse osmosis-filtration to gain proteins from various process streams.

It is the objective of this invention to present a method which helps decrease the amount of wastewaters and to utilize the permeate and the ingredients therein. It is a further objective to present a method that can be realized and employed in a simple and profitable way.

The objective of this invention is attained through the method which is characterized by what is presented in the appended claims.

According to the invention, the permeate is treated by leading it to an additional filter and by purifying it there. Thereafter, the permeate leaving the additional filter is clean in the technical sense of the word, and it can be utilized at many various phases of the process e.g. for electrodialysis by leading it back to the process. Both the amount of wastewater and that of the water introduced to the process can be considerably reduced, which results in cost reduction. If, however, it is desired to lead the permeate to the sewage system, it is sufficiently clean and it can be led directly into e.g. a waterway, at least if the possibly existing bacteria are eliminated first. In many cases, the retentate, acquired from the additional reverse osmosis filter is useful in other processes and the amount of ingredients to be purchased that are necessary for the processes, can be reduced. The invention can be used for treating whey in the field of milk processing industry, especially in cheese production

In an additional application of the invention, the permeate is sterilized by UV light, thereby eliminating harmful ingredients and bacteria.

In a second additional application of the invention, the permeate is pasteurized after the additional reverse osmosis filtration. During the pasteurization, temperatures ranging from 75°C to 90°C should preferably be reached, thereby eliminating detrimental ingredients.

One important addition to the process is that condensation water is appropriately mixed with the clean water emitted from the process. E.g. the electroconductivity values - originally about 300 microS - are considerably improved when the clean water emitted from the process is mixed with condensation water whose electroconductivity may be in the range of about 10 microS Thereby, water fulfilling even strict environmental safety requirements is obtained, which can be directly discharged into waterways or led to a closed water system..

In the following, the invention is defined in more detail with reference to the attached drawings, in which

  • Fig. 1 is a flow diagram showing a set of equipment for applying a method in accordance with the invention,
  • Fig. 2 is a flow diagram showing another set of equipment for applying a method in accordance with the invention, and
  • Fig. 3 is a flow diagram showing a third set of equipment for applying a method in accordance with the invention.

With reference now to Fig. 1, an example part of the process covered by the application is presented. Complying with this method, the saliferous, separated whey is cooled to a temperature under 10° C, preferably to about 6°C, and the feed is further led from the process to storage tank 1, where from it is led to pasteurizing unit 2. In the pasteurizing unit the whey is pasteurized to temperatures ranging from 70°C to 80°C, preferably to roughly 75°C, whereafter it is cooled to 15 - 25°C, preferably to a temperature of about 20°C. The saliferous whey is further led to filtration unit 3, which is a nano filtration unit. The permeate (temperature about 15 - 25°C) which results after the filtration is further led to the additional reverse osmosis (RO) filtering equipment 4 which purifies the permeate and produces commercially clean (=clean in the technical sense of the word) water. At this stage, the dry solids content of the permeate is approximately 0.3 - 0.5 per cent. As shown in the diagram, the permeate derived from RO filter 4 is first treated by pasteurizing it in unit 6 and/or it is sterilized by UV irradiation in the UV equipment 5. Thereafter the purified permeate can be led to water tanks 7, 8, where it can be stored and further led to various processing or other uses, e.g. to an electrodialysis unit or possibly to the sewage system. The permeate is commercially clean water and the measured conductivity value is about 150-300 microS. After filter 3, the permeate may also be led to a separate tank for saliferous water where it is stored as long as desired. From the storage tank the permeate can be reintroduced e.g. to the salt brine processing, e.g. to electrodialysis. It is a preferred solution to mix 23 the clean water resulting from the process with condensation water. The condensation water can be led directly to waterways or to a closed system.

With reference now to the application and example in Fig. 2, the treatment of the permeate is for the most part similar to that described above. In this figure also the treatment of the retentate is illustrated. In this method, the retentate flowing from filter 3, its temperature being about 20°C, is heated by heat exchanger 9 to about 35°C-45°C, preferably to reach a temperature of about 38°C. The dry solids content of such a retentate is about 24 per cent. Next, the retentate is centrifugalized by centrifuge 10 so as to eliminate crystals, and it is then led to storage tank 11. Next, the retentate, i.e. whey is led to electrodialysis module 12, where it is desalinated. The salt content of the whey emitted out of this equipment depends on the performance of the desalination process. The whey is led away 24 and the resulting saliferous water (dry solids content 1.1 - 1.3%) is led to intermediate tank 13 and cooled to reach a temperature of about 20°C, whereafter it is led to nanofiltration module 14. The permeate herefrom is further led to reverse osmosis (RO) filter 15. The dry solids content of the permeate is now about 0.3 - 0.5 %. Thereafter the permeate is led - as described above - after pasteurization and/or UV irradiation to storage tanks 7, 8, where also condensation water may be led.


Anspruch[de]
Verfahren zum Behandeln von Molke auf dem Gebiet der Milchverarbeitungsindustrie uns insbesondere der Käseproduktion, wobei die abgetrennte Molke einer Pasteurisierungseinheit (2) und dann von der Pasteurisierungseinheit einer Nanofiltrierungseinheit (3) zugeführt wird, von wo das Permeat an einen anderen Ort geleitet wird, wobei der zurückgehaltene Teil der Molke von einem Wärmetauscher (9) erwärmt wird und dann in einer Zentrifuge zentrifugiert wird, wonach er zu einem Speichertank (11) geleitet wird, wobei der zurückgehaltene Teil der Molke von dem Speichertank (11) zu einer Elektrodialyse (12) geleitet wird, wo er behandelt wird, um eine Molke mit reduziertem Salzgehalt herzustellen, wobei die so gebildete salzführende Flüssigkeit dann durch einen intermediären Tank (13) in eine Nanofiltrierungseinheit (14) und dann weiter zu einem Umkehrosmosefilter (15) geleitet wird, wobei das Molkepermeat nach der Nanofiltrierungseinheit (3) weiter in einem Umkehrosmosefilter (4) und einer Pasteurisierungs- und/oder UV-Bestrahlungseinheit behandelt wird, um technisch reines Wasser zu erhalten, wobei das Wasser zu Wassertanks (7, 8) geleitet wird, wo es gespeichert und weitergeleitet wird für verschiedene Verarbeitungsanwendungen oder andere Anwendungen, z. B. zu einer Elektrodialyse (12) oder in das Abwassersystem. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Molkepermeat nach der Umkehrosmosefiltrierung mit UV-Licht (5) sterilisiert wird. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Molkepermeat nach der Umkehrosmosefiltrierung pasteurisiert (6) wird. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das technisch reine Wasser, das aus dem Prozess gewonnen wurde, in geeigneter Weise mit Kondensationswasser (23) gemischt wird, so dass Wasser hergestellt wird, das Umweltschutzvorgaben entspricht, und das direkt in Wasserstraßen abgelassen oder in teilweise oder ganz geschlossene Kreislaufsysteme geleitet wird.
Anspruch[en]
A method for treating whey in the field of milk processing industry and in particular in cheese production, in which method the separated whey is led to a pasteurising unit (2), and then from the said pasteurising unit to a nano-filtration unit (3) from where the permeate part is led elsewhere, the retentate part of the whey is heated by a heat exchanger (9), and then centrifuged in a centrifuge (10), after which it is led to a storage tank (11), and wherein the said retentate part of whey is led from the said storage tank (11) to an electrodialysis (12), where it is treated in order to produce a whey having reduced salinity, the resulting saliferous liquid is then led through an intermediate tank (13) into a nanofiltration unit (14), and then further to a reverse osmosis filter (15), and that the whey permeate is further treated after the nanofiltration unit (3) in a reverse osmosis filter (4) and pasteurization and/or UV irradiation unit in order to obtain technically clean water, the said water is led to water tanks (7, 8), where it is stored and further to led to various processing or other uses, e.g. to an electro-dialysis (12), or to the sewage system. A method as claimed in claim 1, characterised in that the whey permeate is sterilised by UV light (5) after the reverse osmosis filtration. A method as claimed in claims 1 or 2, characterised in that the whey permeate is pasteurised (6) after the reverse osmosis filtration. A method as claimed in one or several of claims 1 to 5, characterised in that the technically clean water derived from the process is appropriately mixed with condensation water (23), thereby producing water compatible with environmental requirements which is discharged directly into waterways or led to partially or wholly closed circuit systems.
Anspruch[fr]
Procédé de traitement du lactosérum dans le domaine de l'industrie de transformation du lait et en particulier dans la production de fromage, dans lequel procédé le lactosérum séparé est acheminé vers une unité de pasteurisation (2), puis de ladite unité de pasteurisation à une unité de nanofiltration (3) depuis laquelle la partie de perméat est acheminée ailleurs, la partie de rétentat du lactosérum est chauffée par un échangeur thermique (9), puis centrifugée dans une centrifugeuse (10), après quoi elle est acheminée vers une cuve de stockage (11), et dans lequel ladite partie de rétentat du lactosérum est acheminée de ladite cuve de stockage (11) vers une électrodialyse (12) où elle est traitée afin de produire un lactosérum présentant une salinité réduite, le liquide salifère résultant est ensuite acheminé au travers d'une cuve intermédiaire (13) dans une unité de nanofiltration (14), puis encore vers un filtre d'osmose inverse (15), et en ce que le perméat du lactosérum est davantage transformé après l'unité de nanofiltration (3) dans un filtre d'osmose inverse (4) et dans une unité de pasteurisation et/ou d'irradiation aux UV afin d'obtenir de l'eau techniquement propre, ladite eau est acheminée vers des cuves d'eau (7, 8), où elle est stockée et en outre pour conduire à diverses transformations ou autres usages, par exemple une électrodialyse (12), ou vers le système d'eaux usées. Procédé tel que revendiqué à la revendication 1, caractérisé en ce que le perméat de lactosérum est stérilisé par de la lumière UV (5) après la filtration d'osmose inverse. Procédé tel que revendiqué aux revendications 1 et 2, caractérisé en ce que le perméat de lactosérum est pasteurisé (6) après la filtration d'osmose inverse. Procédé tel que revendiqué dans l'une ou dans plusieurs des revendications 1 à 3, caractérisé en ce que l'eau techniquement propre dérivée du processus est mélangée de manière appropriée avec de l'eau de condensation (23), produisant ainsi de l'eau compatible avec les exigences environnementales qui est éliminée directement dans des voies d'eau ou acheminée dans des systèmes de circuits partiellement ou totalement fermés.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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