How does aircraft lavatory operate?
Old aircraft toilet system relied on large quantity of blue sanitation fluid but the system failed due to frequent leak resulting in formation of a frigid ball of blue ice and frozen feces.
Today, the modern aircraft use vacuum toilet system that relies on strong suction. The bowl of the comfort toilet is coated with non-stick teflon.
The vacuum toilet system eliminates the use of huge quantity of blue sanitation fluid. When the flush button is pressed in the vacuum toilet system, a valve opens which sucks down the matters on the bowl. The matters accelerate faster than a formula one racing car and in seconds the pipes carry the contents to the large tank at the rear part of the airplane.
The bowl must be emptied once the plane touches down. The plane must wait for the removal of human waste to initiate next takeoff. The honey truck which has stainless steel tank arrives at the parking zone which sucks the wastes from the aircraft.
A powerful vacuum pump can fill the truck’s tank in less than 10 minutes however; it differs according to the aircraft models. It requires 15 to 20 minutes to empty the bowl of giant Airbus A380. The pipe from the honey truck is connected to the airplane by the driver.
The emptying procedure must be carried out faster in order to maintain the schedule operation of the airplane. The waste pipe is connected to the airplane’s release valve making sure it is locked. The honey truck drives the waste to the disposal facility where the waste is pulled by gravity towards sewer pipe.