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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.