Yes, I also asked this question at one time)) Read interesting. To quote the author:
Quite often in everyday life I hear this question from people far from the aircraft. "Is it true that on the plane on the train - all on the street?" And indeed, if we see a train in rush toilet hole sleepers, the plane can not see anything. Does this mean that the waste products do not fly out?
First, let's define what we've got on the plane to everything was clean and hygienic. On the plane, usually there is a system of water supply and waste disposal. Water system fueled with drinking water from the vehicle before departure
Water has a passport of conformity and a receipt. I do not know as it passes control to carpool, but I assure - passes, and quite thorough. This water can be drunk straight from the hose (although I'm not a fan). Before departure it is charged in the aircraft tank (200 liters on the A-320). Usually filling is completely until pour from the edges (it is worth the drain pipe and the water begins to overflow onto the platform). Further, this water is fed into the boiler (then passengers in tea), sinks and other sinks. In the A-320 a little water is taken to wash off the toilet after each pressing. In Tu-154 do not, toilet water as usual. So I'll tell you a secret that water from the sink (and drain from the boiler) flies directly overboard out. Washed their hands with soap and water after a couple of seconds is in free flight at an altitude of 10 km. This happens through a special drain pipe at the bottom of the aircraft fuselage.
Tucked into the water tank water is distributed to consumers (sinks and other boilers) under pressure. The pressure generated in the tank by air compressors. Everything is quite simple. On older Tu-154B and some Tu-154 are 3 water tanks (perdny lobby, bar-kitchen in the middle of the passenger compartment and rear toilets). And from there the water flows by gravity! Just tanks located above the ceiling. The system delivers a lot of trouble to maintain. At least when you consider that each tank must be refilled separately, running around the aircraft with a hose. Now, about the toilets and toilets. As you know, deal with the dregs of toilets as well as water from sinks - not good. Therefore, all purged fall into a special tank (170 liters A-320). Picture for Tu-154M:
In the tank this whole thing is kept and stored the entire flight. In this work the toilet on the A-320 and Tu-154, there are some differences. In-320 from the toilet waste removal occurs via vacuum. In general, the shit just sucks in the tank. I do not know how realistic to stick to the toilet, but it is better not to experiment, because it is theoretically possible. Tu-154 in the tank waste is a filter which traps large particles (bueeee), filtered and sent back to top pump to flush the toilet. Generally, after a long flight the concentration of bad things in the water will only increase. To this slurry is strongly does not stink, are added to the tank chemistry (small bags thrown straight into the pot, which then dissolve and disinfected water). The principle of operation and the smell of this chemistry is the same as in the normal composting toilets. Chases shit circle mercilessly. In the Boeing-737 Classic system is exactly the same. Liquid in a toilet should be filled in advance, which is done before each flight.