**3. Final considerations**

Dairy industries, as potential polluters, need to seek improvements in processes and technologies, to remain competitive and to meet quality requirements in a sustainable way.

Membrane separation processes have been studied and used in the dairy industry, mainly aimed at treating effluents for reuse water generation, which ends up contributing to the preservation of water resources, generates savings for industries, and contributes to sustainability.

The possibilities of study are broadened in the case of membranes, as there is the possibility of reusing the permeate and the concentrate, allowing the reuse of water and materials for the production of byproducts. The studies presented demonstrate the relevance of membrane separation processes and their efficiency in the production of quality reuse water and the possibility of concentrating, separating, and purifying substances.
