Airplane Lavatory. Please explain how it works.?

I wonder if the airplane toilet dump sh%t in the athmosphere. Why so low in pressure if they use a tank?

BOOMBOOMBILLY2006-06-20T23:48:37Z

Favorite Answer

ALL AIRCRAFT TOILETS ARE SIMILAR TO THE TOILET AND GREYWATER TANKS IN AN R.V. AFTER EACH FLIGHT WHEN THE AIRPLANE IS SERVICED, THE SEWAGE TANK IS DRAINED AND WATER IS SERVICED.
MODERN AIRCRAFT DESIGNED IN THE LAST 20 YEARS USE A VACUMN SYSTEM TO FLUSH FOR WATER CONSERVATION, AND A MAJOR WEIGHT REDUCTION.

hoarp0012006-06-21T15:35:17Z

The plane has a tank under negative pressure. All the poo and waste is slopping about in the bottom of the tank. When you flush the loo, a plastic flap (esentialy a valve) opens and air rushes down the toilet, along the pipe and into the tank. It takes the poo with it into the tank.

zmonte2006-06-20T23:41:59Z

It doesn't dump out of the plane. It actually stores waste in a "black water" tank. Low volume flows are just to conserve the blue water (sanitizing agent).