ABSTRACT
Biofilters rely on a fundamentally simple concept, but treatment eventually results from the activity of a microbial ecosystem. Design and construction of a biofilter system must be followed by rapid development of a vigorous microbial culture. Monitoring is particularly important during the startup period, when the microbial ecosystem makes the transition from a low-density inoculum to a thick, well-acclimated biofilm. Once a microbial population is adequately established on the medium, a monitoring program can be instituted to measure effectiveness and guide maintenance. Preventing medium damage during the loading of the system is essential, as it is during shipping. The addition of nutrients to the medium during the loading phase will depend on the filter medium utilized and the waste gas treated. Buffering chemicals may be added to the medium during loading if acid-producing gases are to be treated. Air flow should begin within 24 to 48 hours after inoculation and loading.
