How is the waste managed on ISS? I guess there are three main waste types: two human waste (liquid and solid) and various packaging for food and substances for experiments. Are they recycled or sent to Earth or discarded in space?
Urine is captured and on the Russian side of the house electrolyzed to make oxygen and the hydrogen vented.
Most other waste is packed into one of the departing capsules (Progress), HTV (Just retired, HTV-A to replace it), Cygnus, ATV (before it retired). Dragon Cargo brings back useful things since it lands.
The rest burn up during reentry.