Abstract: A waterless vacuum toilet system for an aircraft includes a toilet bowl connected via a suction valve and a waste collection pipe to a waste collection tank. Waste-contacting surfaces that come into contact with urine and fecal waste are coated with an adhesion-inhibiting or adhesion-reducing nanocoating. The adhesion of waste is significantly reduced, and the need for flushing water is completely eliminated. Instead, an air jet arrangement preferably including an annular ring nozzle or annular air gap directs an airflow into the toilet bowl and along the nanocoated waste-contacting surface thereof, to “air flush” the waste material from these surfaces. The flushing airflow may be induced through the air jet arrangement into the toilet bowl by the suction applied through the suction valve. The “air flushed” toilet system substantially reduces the total system weight and eliminates the need for toilet flushing water to be carried in the aircraft.

Abstract: A ventilation system for removing odorous air from a toilet bowl includes a chemically sensitive electronic transducer that senses the presence of methane gas and controls a fan and motor unit according to such presence. When the amount of methane in the toilet bowl drops below a predetermined quantity, the fan and motor unit is stopped, and such unit is started only when methane is present in such predetermined quantity.

Abstract: A compost-type toilet which includes: a solid-liquid separating means which also serves as a means for transferring the solid component of excrement mounted below the opening of a bowl; a means for treating the liquid component of excrement provided beneath the solid-liquid separating means. The liquid component treating means contains various kinds of adsorbent materials capable of adsorbing the liquid component separated by the above mentioned solid-liquid separating means and the inner structure is so constructed as to enhance the air ventilation to vaporize or volatilize the liquid component adsorbed with the adsorbent materials; a means for treating the solid component of excrement is provided in a position adjacent to the solid-liquid separating means in the transferring direction to the solid component separated by the above mentioned solid-liquid separating means.