CX A340-600's have a waste disposal sink in the galleys that uses vac lav system to take away "lumpy" items. Close the lid, press the button & waste gone away.
Funny how all the crew deny it, recently had an aircraft arrive on stand & saw the evidence of wine/coffee etc on the ground from the drain mast. Many crews mistakenly put it down the sink in the toilets, not the toilet pan.
It's not rocket science, but really does make you wonder how lazy (or stupid) some crew can be!!!!!