Gas Loop: Ammonia emissions in pig livestock from a problem to a fertilizer resource

Gas Loop has developed and monitored an air washing system that removes ammonia from the air of animal housing and recovers it in an ammonium sulphate solution. This increases animal welfare and productivity due to better air quality inside the pig housing. The device draws ammonia rich-air from the stable through suction ducts located below the slatted floor. The air treatment is based on the chemical absorption of ammonia by counter-current acid washing into a tower. The process takes place at pH 4.5 and sulfuric acid solution is used as an absorbent matrix.