Data from the regular monitoring of a full-scale biofilter at a municipal solid waste treatment facility for the integral treatment of domestic residues was analyzed in order to assess potential operational problems and to evaluate reactor’s performance in terms of ammonia removal, the target odorous compound at the facility. Performance was assessed based on ammonia removal efficiency and elimination capacity. Average elimination capacities up to 1,6 g NH3 m-3 h-1 at average inlet loads of 2,1 g NH3 m-3 h-1 were found, which correspond to a low-loaded biofilter type. Year-round data collected and packing material analysis revealed a marked effect of water content in the packed bed of the biofilter which lead to reduced removal efficiencies.

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