Waste fluid holding tank drain system and method

A waste fluid containment and draining system comprising:

• a black waste water holding structure for holding black waste water;
• a grey waste water holding structure for holding grey waste water;
• a central waste water holding structure disposed adjacent the black and grey waste water holding structures, the central waste water holding structure including a first partition wall separating the black waste water holding structure from the central waste water holding structure, and a second partition wall separating the central waste water holding structure from the grey waste water holding structure;
• a first liquid level sensing device configured to sense a level of black waste water contained in the black waste water holding structure, and generating a first electrical signal indicative of the sensed level of the black waste water;
• a second liquid level sensing device configured to sense a level of grey waste water contained in the grey waste water holding structure, and generating a second electrical signal indicative of the sensed level of the grey waste water;
• a first electronically actuated valve associated with the black waste water holding structure which enables emptying of the black waste water into the central waste water holding structure when the first valve is opened;
• a second electronically actuated valve associated with the grey waste water holding structure which enables emptying of the grey waste water into the central waste water holding structure when the second valve is opened;
• a third electronically actuated valve operably associated with an interior area of the central waste water holding structure;
• a macerator pump in flow communication with the third electronically actuated valve and having an input in flow communication with an interior area of the central waste water holding structure;
• a discharge conduit in flow communication with an output of the macerator pump;
• and
• a control subsystem in communication with the first and second electronically actuated valves, the first and second level sensing devices, and the macerator pump, the control system configured to control the first and second electronically actuated valves, together with the macerator pump, to enable selective operation of the macerator pump and pumping out of the black waste water and grey waste water holding structures through the central waste water holding structure and through the discharge conduit.

A method for containing and emptying waste fluids collected from one or more toilets on a vehicle, the method comprising:

• using a black waste water holding structure to hold black waste water;
• using a grey waste water holding structure to hold grey waste water;
• using a central waste water holding structure including a first partition wall between the central waste water holding structure and the black waste water holding structure, and a second partition wall between the central waste water holding structure and the grey waste water holding structure, the central waste water holding structure operating to receive and hold both black waste water and grey waste water;
• using a plurality of valves associated with the black and grey waste water holding structures to enable selective emptying of one or both of the black and grey waste water holding structures into the central waste water holding structure when the valves are opened;
• using an additional valve in flow communication with the central waste holding structure to control emptying of the central waste holding structure;
• using a macerator pump having in flow communication with an interior of the central waste water holding structure and with the additional valve, to pump out the black waste water and the grey waste water from the central waste water holding structure;
• using a discharge conduit in flow communication with an output of the macerator pump to drain at least one of the black waste water and the grey waste water from the central waste water holding structure to a remote waste water receiving facility;
• and
• using a control subsystem in communication with the plurality of valves, the additional valve, and the macerator pump for controlling the plurality of valves and the additional valve, together with the macerator pump, to enable operation of the macerator pump and selective draining of the holding structures through the central waste water holding structure, the additional valve, and the discharge conduit.

A waste fluid containment and draining system comprising:

• a black waste water holding compartment for holding black waste water;
• a grey waste water holding compartment for holding grey waste water;
• a central compartment having a first inlet, a second inlet, and an outlet;
• a first electronically controlled valve for coupling a drain outlet of the black waste water holding compartment to the first inlet of the central compartment;
• a second electronically controlled valve at a partition for coupling a drain outlet of the grey waste water holding compartment to the second inlet of the central compartment;
• the first electronically controlled valve associated with the black waste water holding compartment enabling emptying of the black waste water when a signal is received by the first electronically controlled valve causing the first electronically controlled valve to be opened;
• the second electronically controlled valve associated with the grey waste water holding compartment enabling emptying of the grey waste water when a signal to the second electronically controlled valve is received causing the second electronically controlled valve to be opened;
• a macerator pump having an input in flow communication with an interior area of the central compartment;
• a third electronically controlled valve operably associated with the central compartment and in communication with the macerator pump;
• a discharge conduit in flow communication with an output of the macerator pump and with the third electronically controlled valve;
• and
• a control subsystem in communication with the first, second and third electronically controlled valves and the macerator pump for selectively controlling opening of the first, second and third electronically controlled valves, together with the macerator pump, to enable operation of the macerator pump and selective pumping out of the black waste water and grey waste water holding compartments through the central compartment, through the third electronically controlled valve, and through the discharge conduit.