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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.

As space flights tend to be more prolonged problems of oxygen generation by physico-chemical means assume greater importance. The paper deals with the water electrolysis process and CO2 reduction. Some operational results of the system for water electrolysis on Mir space station are presented. Expected characteristics of the systems for water electrolysis and carbon dioxide reduction are considered.

Development of closed life support systems for water recovery, oxygen generation and food processing is achievable in the future. However, currently the possibility of partial reproduction of food components from metabolic products and biocomplex waste should be taken into account when advanced life support system development is under consideration. Studies on carbohydrate synthesis from products of life are of particular interest because carbohydrates hold the first place in terms of mass in the food. The paper discusses possible ways of carbohydrate synthesis by physical/chemical means. Separate stages of a carbohydrate synthesis process are considered.

The Electron-VM Oxygen Generation System (OGS) is a main source of oxygen for crew breathing on the International Space Station (ISS) and the result of updating the Electron-V OGS that has been in successful operation for 17 years on Mir Space Station. The successful accomplishment of a manned flight program primarily has resulted in the stable operation of the system. The paper deals with analysis of off-normal situations related to the operation of the Electron-VM on board ISS. The system switching-off analysis based on the telemetry information processing and the results of the additional tests conducted under flight and ground conditions is performed. A principal cause of system switching-offs is a reduction in the pressure built by the circulating pumps due to ingress of gas bubbles into the suction pipeline. The results of the Electron-VM OGS switching-off analysis and the practical recommendations regarding its prevention are reviewed.