Patent ID: 7194979

Claim:
A method for removing ammonia, other odors, dust, particulates, and microbial pathogens from the air from an animal rearing facility comprising: a) providing an enclosed building for an animal, said building comprising at least one inlet for admitting air from the environment, at least one outlet for exhausting air therefrom, a ventilation system comprising an air mover effective to draw air into said building through said inlet and out from said outlet, and an air scrubber in communication with said outlet; b) moving air in said building through said outlet and said scrubber; and c) contacting said air moving through said scrubber with an solution of a salt of an acidic proton donor selected from the group consisting of alum, AlCl 3 , Al(NO 3 ) 3 , Na 2 SO 4 , NaHSO 4 , FeSO 4 , Fe 2 (SO 4 ) 3 , FeCl 2 , FeCl 3 , Fe(NO 3 ) 2 , Fe(NO 3 ) 3 , CaSO 4 , CaCl 2 , Ca(NO 3 ) 2 , MgCl 2 , MgSO 4 , Mg(NO 3 ) 2 , and combinations thereof, said solution being provided in an amount effective for removing ammonia present in said air by flocculation of said ammonia with said salt of an acidic proton donor.