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The paper deals with the system for hygiene water recovery developed for the Mir orbital space station. The paper presents a system schematic, its operation logic and the system component design. The results of system ground checkout tests and its operation on the Mir space station verify the system design solution adopted and the effectiveness of the procedures developed for system preservation and re-activation prior to and during station spaceflight.

As space flights tend to be more prolonged problems of oxygen generation by physicochemical means assume greater importance. The paper deals with the water, electrolysis process, CO2 concentration and processing organisation schemes. Some operational results of the system for electrolysis of aqueous alkali solution and CO2 removal on Mir space station are presented. Expected characteristics of the complex system for oxygen generation from carbon dioxide are considered.