The present disclosure relates to systems and processes for production of a concentrate of skim milk or whey. Such systems and processes may include the steps of providing a feed of skim milk or whey, subjecting said feed to a reverse osmosis to obtain a reverse osmosis permeate and a concentrate of skim milk or whey, and subjecting the concentrate of skim milk or whey to an ultra-filtration to obtain an ultra-filtration permeate and a retentate of skim milk or whey.
