Membrane deamination of ammonia nitrogen need to use absorbent to absorb the free ammonia volatile wastewater, membrane deamination of ammonia nitrogen available absorbent sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid, etc., of which hydrochloric acid has a certain degree of volatility, nitric acid oxidizing stronger, phosphoric acid is more expensive, due to the sulfuric acid has a chemically stable, inexpensive and so on, so that the membrane deamination of ammonia nitrogen has become the most commonly used absorbent.