Evaluation of Biofilter Media for Treatment of Air Streams Containing VOC's

摘要

Biofilter systems for VOC control utilize attachment media as microbial growthsurfaces. In the study, three microbial attachment media for the treatment of air contaminated with VOCs are preliminarily evaluated. These media included two synthetic types, a monolithic channelized medium and a pelletized medium. The third medium being evaluated is a natural type that is a proprietary compost mixture. For the channelized type, two contact regimes are being considered, one a countercurrent mode with the air flow directed upwards and the nutrient and effluent recycle flows directed downwards, and the other a cocurrent mode with the air, nutrient, and recycle flows directed downwards. All three media achieved 95+% removal efficiencies at a toluene loading of 0.725 kg chemical oxygen demand (COD)/cu m day.