Alkaline electrolyte regeneration

A system comprising:

• an electrolysis unit comprising an anode with anolyte solution and a cathode with catholyte solution, separated by a cation-selective separator, and a controller configured to carry out an electrolysis process in the electrolysis unit;
• a spent alkaline electrolyte (SE) supply configured to supply SE that comprises an electrolyte cation and dissolved aluminum oxide hydrates from an aluminum-air battery, to the anolyte solution,
• wherein the anolyte solution comprises a same-cation salt that includes the same electrolyte cation as in the SE and does not include aluminates, and is used to replenish the corresponding electrolyte cation, and
• wherein the electrolysis unit is configured to precipitate aluminum tri-hydroxide (ATH) and form regenerated alkaline electrolyte by electrolysis of the SE;
• an ATH collection unit configured to receive the precipitated ATH from the anolyte solution;
• and
• a regenerated electrolyte collection unit configured to receive the regenerated alkaline electrolyte from the catholyte solution,
• wherein the addition of the same-cation salt counters cation movement out of the anolyte solution due to acidification thereof as a result of the ATH precipitation.