I don't think the ammonia concentrations are high enough to make it cost-effective. There's a reason why commercial ammonia is produced from petroleum rather t

I don't think the ammonia concentrations are high enough to make it cost-effective. There's a reason why commercial ammonia is produced from petroleum rather than being extracted from animal waste. If you wanted to use animal waste, you'd probably be better off fermenting it into methane (that definitely works, and is actually used as a power source in some specialized situations).