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The paper presents the results of ground and flight (on OSS Mir) tests of an updated purification assembly of the WRS-C system outfitted with a filter-reactor. The tests have proved that the filter-reactor oxidizes effectively basic organic contaminants in humidity condensate including ethyleneglycol to ones that easily undergo sorption, enables the operation of the recovery system in the event of an off-design increase in organic contaminants in condensate and significantly improves the lifetime of the purification assembly. The data obtained confirm a wise selection of the purification assembly hardware for the system for water recovery from humidity condensate WRS-CM for the ISS service module.

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.

The paper describes the hardware for potable water produced by processing condensate from reusable spacecraft fuel cells. Gaseous and dissolved hydrogen and alkali are removed from condensate by a sorption/catalytic method under atmospheric pressure. The hardware may be used on spacecraft outfitted with fuel cell-based power plants.

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.

This paper deals with the development of the Trace Contaminant Dynamics Simulation Model (TCDSM) intended for the design concept of Trace Contaminants Removal System (TCRS) in development of a Space Vehicle Manned Pressurized Module (PM). The formalized description of the TCDSM includes the nonlinear equations of mass balance for the specific contaminants and the formalized descriptions of the contaminants sources and sinks. The crew and the PM non-metallic structural materials are main sources of contaminants. The air environments of the docking resupply (RSV) and crew-carrying space vehicles (CCSV) are the additional sources and sinks of the contaminants. The formalized description of the TCRS as the main sink of the contaminants takes into account the specific contaminants removal features based on the distribution factors defining its adsorptive capacity.

This paper reviews Air Revitalization System (ARS) for Russian Segment of International Space Station software simulation development and implementation by the example the Service Module (SM) ARS. This simulation is designed for the ARS ground test functional analysis and in-flight support Individual ARS complex systems formal description is based on each system description as a unit, using information received from experiments and detailed simulations. Failure can be introduced for contingency simulation.

This paper reviews the design and properties of the Water Supply System (WSS). It also discusses the water balance and its delivery amounts, as well as it presents diagrams and properties of water recovery system from humidity condensate WRS-CM and regeneration from urine WRS-UM which are the part of WSS. Some results of activities conducted for provision of water intake in a system of WRS-CM from different modules of station are shown and the problems of WSS interaction of Russian segment (RS) and American segment (USOS) of the International Space Station (ISS) are discussed.