Method for purifying water as well as plant suitable for said method

A method for purifying water using at least one unit for trapping one or more ions and at least one membrane filtration unit,

• wherein an aqueous stream is withdrawn from a source and is fed to the unit for trapping one or more ions, the aqueous stream leaving the unit for trapping one or more ions is fed to the membrane filtration unit, at least one concentrate stream and one permeate stream are obtained in said membrane filtration unit, wherein at least part of the one or more ions that are trapped is added to the permeate stream to obtain a permeate stream enriched with one or more ions and the concentrate stream is fed to a unit for generating a basic stream and an acid stream, said unit performs bipolar membrane electrodialysis,
• the acid stream is applied in a regeneration step of the unit for trapping one or more ions, an effluent stream obtained in the regeneration step is fed to a second unit for trapping one or more ions, wherein at least part of the effluent stream obtained from the second unit for trapping one or more ions is fed to the permeate stream, wherein the effluent stream is stored and is fed to the permeate stream,
• said second unit for trapping one or more ions performs a regeneration step, and in said regeneration step the basic stream is fed to the second unit for trapping one or more ions.