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A waste management system for an animal breeding/habitant module in CEEF is proposed. The waste management system consists of two subsystems, the urine treatment subsystem and the feces and daily waste treatment subsystem. Wet oxidation processes and a drying toilet process are used in those subsystems. The urine and the feces excreted from human beings and animals in the module are separately treated in order to collect NaCl from the urine. The urine is stored in the tank until the volume reaches a fixed level, and is sent to a wet oxidation process in the urine treatment subsystem. The liquid oxidized in the process is sent to a salinity recovery process to recover NaCl, and the produced gas is sent to a gas adjustment process. The salinity recovery process and the gas adjustment process are in another process.

Compared with other applicable processes such as incineration, the catalytic wet oxidation process is considered to be the most practically applicable waste treatment process for the CELSS. In this report, the quantity of carbon monoxide generated in the wet oxidation process is identified and a measure for carbon monoxide minimization is discussed. As a result of a bench test, it became apparent that a non-negligible quantity of carbon monoxide could be generated in the catalytic wet oxidation process. However, it can be expected that this CO content will be reduced to a safe level by applying the wet oxidation process catalyst reactor to CO oxidation.

In the Closed Ecological Life Support System ( CELSS ) concepts which have been proposed up to now, most of the foods to be provided to the crew have been based on plant and vegetable produce. In this paper, a snail breeding module which will serve, as a subsystem of CELSS, to provide the space crew with animal nutrients has been studied. As a source of nutrition for the crew, snails have various advantages over other animal species. Snails can normally be bred in a limited space and they are insensitive to the lack of oxygen and feed. In this breeding module, a species of snail ( Helix pomatia ) will grow, mature, mate and reproduce. In order to minimize the crew's work, automated operations for feeding, cleaning wastes, handling snails and their spawn, as well as for the maintenace of the module, will be applied. A submodule which processes snails for food production is also studied.

In the first half of the next century, Mankind will expand its sphere of existence to the Moon and space, and they will stand on Mars and study the other planets. Then, humans will inevitably be required to live for long periods, two years or more, in micro-gravity and/or low gravity environments. However, it is well known that such micro or low gravity environments adversely affect human physiology and psychology. The longer the period the greater such effects are and these can result in serious health problems. To improve living conditions in space by generating artificial gravity will be important to solving these problems.