A treatment of demineralization effluents, particularly recycling effluents, a method for demineralizing whey and treating the effluents, and a facility for implementation thereof. The treatment of whey demineralization effluents includes: i) supplying a whey demineralization effluent, ii) treating by reverse osmosis effluent recovered in i) to obtain a reverse osmosis permeate and retentate, iii) neutralizing the retentate pH, iv) treating the neutralized retentate by nanofiltration to obtain a permeate including monovalent ions and a retentate including divalent ions and residual organic materials, v) treating the permeate in iv) by electrodialysis with bipolar membrane to obtain acidic solution(s) and basic solution(s). Thus, it is possible to treat effluents, limit their environmental impact, generate solutions for the whey demineralization process, reduce the cost of whey demineralization because some process water from electrodialysis comes from treatment of the generated effluents, and reduce the total amount of effluent sent to the wastewater treatment plant.
A23C 9/144 - Préparations à base de laitLait en poudre ou préparations à base de lait en poudre dans lesquelles la composition chimique du lait est modifiée par des traitements non chimiques par des moyens électriques, p. ex. par électrodialyse
A23C 21/00 - Petit-laitPréparations à base de petit-lait
The invention relates to the field of dairy products and particularly concerns a method for the demineralization of whey. The method according to the invention comprises the following steps: obtaining a whey, electrodialysis of the whey at a temperature of 30° C. to 60° C., acidification of the whey to a pH of between 2 and 3.5, pasteurization of the acidified whey, electrodialysis of the pasteurized acidified whey at a temperature of 30° C. to 60° C., and neutralization of the demineralized whey to a pH between 6.7 and 7.2. The method according to the invention makes it possible to achieve the whey demineralization using only the method of electrodialysis while avoiding the problems conventionally encountered with this method, namely a limited demineralization rate, fouling of the membranes, and an insufficient service life.
A23C 9/144 - Préparations à base de laitLait en poudre ou préparations à base de lait en poudre dans lesquelles la composition chimique du lait est modifiée par des traitements non chimiques par des moyens électriques, p. ex. par électrodialyse
A23C 21/00 - Petit-laitPréparations à base de petit-lait
3.
METHOD FOR TREATING WHEY DEMINERALISATION EFFLUENTS
The present invention relates to the field of treating demineralisation effluents, and more particularly to the recycling of such effluents, and concerns a method for demineralising whey and treating the effluents produced, and a facility as such suitable for implementing the method. Disclosed is a method for treating whey demineralisation effluents comprising the following steps of i) providing a whey demineralisation effluent, ii) treating the effluent recovered in step i) by reverse osmosis in such a way as to obtain a reverse osmosis permeate and retentate, iii) neutralising the reverse osmosis retentate to a pH of between 6 and 9, iv) treating the neutralised reverse osmosis retentate by nano-filtration, in such a way as to obtain a nano-filtration permeate comprising monovalent ions and a nano-filtration retentate comprising divalent ions and residual organic matter, v) treating the nano-filtration permeate obtained in step iv) by bipolar membrane electrodialysis, in such a way as to obtain at least one acid solution and at least one basic solution. The method can therefore be used to treat these effluents, limit their environmental impact and generate solutions that can be used in the whey demineralisation process as such. Advantageously, this also helps reduce the cost of demineralising wheys because some of the water of the electrodialysis process originates from the treatment of the generated effluents. The method according to the invention helps reduce the total quantity of effluent sent to the treatment plant.
A23C 9/144 - Préparations à base de laitLait en poudre ou préparations à base de lait en poudre dans lesquelles la composition chimique du lait est modifiée par des traitements non chimiques par des moyens électriques, p. ex. par électrodialyse
The invention relates to the field of dairy products and particularly relates to a method for the demineralisation of whey. The method according to the invention comprises the following steps of: providing whey, electrodialysis of the whey at a temperature of between 30°C and 60°C, acidification of the whey at a pH of between 2 and 3.5, pasteurisation of the acidified whey, electrodialysis of the pasteurised acidified whey at a temperature of between 30°C and 60°C , and neutralisation of the demineralised whey at a pH of between 6.7 and 7.2. The method according to the invention allows a demineralisation of whey to be carried out using only the electrodialysis method, avoiding the problems that classically arise with said method, which are a limited demineralisation rate, fouling of the membranes and an insufficient service life.
A23C 9/144 - Préparations à base de laitLait en poudre ou préparations à base de lait en poudre dans lesquelles la composition chimique du lait est modifiée par des traitements non chimiques par des moyens électriques, p. ex. par électrodialyse
