An apparatus for recovering acid includes: a cathode; an anode; a plurality of anion exchange membranes disposed between the cathode and the anode; a plurality of proton selective membranes alternately arranged with the plurality of anion exchange membranes; a plurality of first compartments for accommodating an aqueous stream comprising anions and protons; and a plurality of second compartments alternately arranged with the plurality of first compartments for accommodating a recovery stream receiving from the first compartments anions through the anion exchange membranes and mainly protons through the proton selective membranes. An associated method is also described.
