I am putting together a (fake) proposal for a process that would convert ammonia in cow manure into elemental nitrogen. The first step includes the conversion of that ammonia into ammonium so that it can be used by bacteria in a later step. I know that this specific reaction favors the reactants, so I am looking to find the right combination of methods to push equilibrium towards the products. I used le chatelier's principle and noted an excess of H20 already, but I have a hunch that wouldn't be enough to sway the equilibrium as much as I want. I know that reducing pH would also favor the products. My concern is that there would be a reaction with the desired ammonium and any acid (or their conjugate bases) added to the solution.
Would a common strong acid (HCl, H2SO4, etc) would be appropriate for this scenario, or is there another method of removing OH- from the solution that could work?