Types of Aircraft Lavatories
Lavatories on modern aircraft are very expensive, and include features that have required substantial upfront and long term investments by the world's airlines to design and develop. Airlines and aircraft manufacturers continue to investigate ways to improve lavatory design technology to increase functionality and reduce costs of production, while maintaining adequate levels of safety, hygiene and amenity.
For this reason many modern lavatories are now no longer of the "chemical toilet blue water recirculated electric flush" variety. Instead lavatory manufacturers have progressed to "vacuum flush" technology to eliminate solid and liquid residue from the basin, patented in 1975.
Some of the advantages of "vacuum flush technology" systems, from aircraft designers’ perspective, is the increased safety attributes through less risk of corrosive waste "spill over" into recesses around the lavatories which can be difficult to protect. Additionally, "vacuum flush systems" are considered to be less odor-inducing and substantially lighter which bear substantial fuel savings by way of reducing the need to carry excessive "blue recirculating water" as in the past.
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