A toilet bowl has a discharge opening for flowing waste material into a gas-tight hopper. A waste valve is disposed between the discharge opening and the hopper for controlling the flow of waste material into the hopper. A first air valve selectively allows air to flow into the hopper for pressurizing the hopper and communicating the waste material from the hopper to the inlet of a grinder. The outlet of the grinder is coupled to a one-inch waste conduit which leads to a waste tank which may be disposed in any convenient location. A second air valve selectively allows air to flow into the waste conduit for pressurizing the waste conduit and forcing the waste at high velocity to the waste tank.

A toilet installation is disclosed which is especially suited for pleasure boats. A discharge tank is disposed under a toilet fixture and connected with it through an inlet orifice. A flexible obturating member comprising a flexible flap member and a downwardly opening cup-shaped float member is fixed at one side of the inlet orifice so that the flexible obturating member hangs in the discharge tank when the latter is not pressurized. Compressed air from an air compressor is carried through a conduit for pressurizing the discharge tank and expelling the effluent from the discharge tank through a drain orifice, the outlet end of the conduit is aimed at the underside of the float member so that compressed air issuing from the conduit thrusts the obturating member against the inlet orifice thereby sealing off the discharge tank from the toilet fixture. A second tank for clean water is preferably provided having a distributor valve unit which selectively connects the hollow rim of the toilet fixture with the interior of the second tank for conveying flushing water thereto and brings the conduit into communication with compressed air from the air compressor. Liquid level detectors are provided in the discharge tank to detect the level of effluents. All nonreturn valves provided have similar open float members which are not in the effluent flow path.

An improved control system (apparatus and method) for a low-water/air-flush toilet system which effects a simultaneous reduction in the amounts of water and compressed air required for flushing the toilet. The system employs an improved spool valve control mechanism to initially water-flush the bowl portion of a toilet combination and thereafter to air-flush a base portion of the toilet combination, in a sequentially controlled operation. The improved control system is particularly adapted to compact biological or chemical waste treating systems for mobil units (e.g., in rail cars, buses, boats, aircraft, etc.), but is also effective with conventional toilets or waste treating systems.

A toilet installation is disclosed which is especially suited for pleasure boats. A discharge tank is disposed under a toilet fixture and connected with it through an inlet orifice. A flexible obturating member comprising a flexible flap member and a downwardly opening cup-shaped float member is fixed at one side of the inlet orifice so that the flexible obturating member hangs in the discharge tank when the latter is not pressurized. Compressed air from an air compressor is carried through a conduit for pressurizing the discharge tank and expelling the effluent from the discharge tank through a drain orifice, the outlet end of the conduit is aimed at the underside of the float member so that compressed air issuing from the conduit thrusts the obturating member against the inlet orifice thereby sealing off the discharge tank from the tiolet fixture. A second tank for clean water is preferably provided having a distributor valve unit which selectively connects the hollow rim of the toilet fixture with the interior of the second tank for conveying flushing water thereto and brings the conduit into communication with compressed air from the air compressor. Liquid level detectors are provided in the discharge tank to detect the level of effluents. All nonreturn valves provided have similar open float members which are not in the effluent flow path.

The present invention refers to a closet combined with a sewage tank (7). The closet comprises a stand enclosing the sewage tank (7) and supporting a chair (1) composed of closet bowl (3), closet seat (4) and closet cover (5). A flushing water tank (18) is connected to the closet. The closet bowl (3) is adapted to be closed in a pressure-tight manner by means of the closet cover (5) and is provided with a discharge valve (8) opening at a predetermined overpressure in the closed closet bowl (3). Means (24, 25, 31) comprising an air-pump (24) are provided to empty the closet bowl (3). By means of the air-pump (24) and said means (25, 31) simultaneously both the closet bowl (3) and the flushing water tank (18) are placed under overpressure. A member (21) is provided to supply flushing liquid from the flushing water tank (18) to the closet bowl (3) when the discharge valve ( 8) in the closet bowl (3) has been opened and the overpressure therein has been reduced.