NH3 Ammonia Scrubber

Ammonia is a colorless gas made of hydrogen and nitrogen, a strong odor causing gas. It is poisonous if inhaled directly in large quantities and direct exposure causes eye, nose and throat irritation in less concentration.

Permissible exposure limit of ammonia: 25 ppm (ACGIH) – TLV (Threshold Limit Value); 35 ppm STEL (Short time exposure limit)

IDLH (Immediate dangerous to life or health): 300 ppm

Aqueous ammonia has very high vapour pressure at atmospheric temperature which causes ammonia to evaporate easily and strongly. A wet scrubber removes ammonia using water using absorption principle, but the efficiency will be decreasing during the recirculation of water. The water pH will be increasing since the ammonia can convert into ammonium hydroxide in water. Due to the alkalinity, it is very effectively scrubbed using acid solution. This will allow the water for continuous recirculation and leave the by-product of ammonium salt. The common acid used for scrubber is Sulfuric acid due to non-volatility.

Ammonium sulphate, the by-product formed from the scrubbing process, will be used as fertilizing ingredient.

Apzem uses packed bed scrubber to remove ammonia from exhaust stream using sulphuric acid as the scrubbing liquid. This scrubber can handle high inlet concentration of ammonia and the removal efficiency up to 99.9 % can be guaranteed.