Biofiltration of ammonia gas with sponge cubes coated with mixtures of activated carbon and zeolite

摘要

Removal of ammonia gas was investigated using a biofilter system packed with small cubes of polyurethane sponge that were coated with a powder mixture of activated carbon and natural zeolite. Experimental tests and measurements include removal efficiency, pH, metabolic products of ammonia and kinetic analysis. A removal efficiency over 90/100 can be obtained with ammonia concentrations below 150 ppm and at contact times above 23 sec. The ammonia adsorbing power of the present biocarrier can protect the biofilter system from a high ammonia shock loading in the feed.