I'm using urea-containing growth medium for experiments with bacteria (1-2 l/day). After the experiment, the growth medium has to be sterilized and disposed. I did this so far by autoclaving, but our technician complained about the ammonia smell that develops (urea breaks down when heated, releasing ammonia).
I'm pretty sure the amount released into the air is not dangerous (I've emptied the autoclave several times), especially if you don't purposefully breathe in the first gust of air that comes out after opening, but I think it's useful to look into alternatives. Also I'm not sure if the autoclave might get damaged on the long run.
Does anyone have experience with this? Do you see a way to sterilize larger amounts of growth medium reliably without heating?