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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.

The paper deals with the problems of development of physico-chemical systems for water recovery and atmosphere revitalization for long-duration space stations. Schematics of regenerative life support systems featuring a high degree of closure and biotechnological components are presented. A year-long experiment has proved the possibility for Man to stay in a closed artificial environment for a long time by consuming substances regenerated by physico-chemical means from the end products of life. A complex of the life support systems (LSS) on Mir space station allowing for oxygen and 90% water recovery as well as its future updating is considered.

The paper deals with some aspects and results of research in major processes and hardware of a system for hygiene waste water recovery and its architecture concepts. A principal system schematic and its functions on Mir space station are presented. It is shown that physico-chemical means ensure cost-effective recovery with minimum energy demand and resupply which is particulary important for long-duration space missions.