There will be a few things you’ll want to do to minimize nitrogen loss. As soon as it’s out, it going to start turning into ammonia and as a gas, it will escape. (The ammonia itself has useful properties, and it’s why urine has been used for all sorts of processes in history(. Making the ‘outputs’ fairly acidic or basic will help keep the nitrogen from leaving in that way. Add vinegar so that the low pH will reduce the bacterial activity that creates the ammonia. Add wood ash to create a very basic environment (high pH) (you should actually get ammonium as a precipitate). Vinegar should also help reduce smells. You might wanna store it for a bit before depositing. (Unless you’re doing the direct deposit method).