Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
(Aluminum Company of America)
This bioscrubber technology consists of an activated carbon filter that supports microbial growth, The bioscrubber is used in a treatment train to convert dilute organic contaminants from other soil, water, and air decontamination processes into carbon dioxide, water, and other nonhazardous comounds. The process removes biomass, supplies nutrients, and adds moisture to enhance bioactivity. In addition to efficient degradation, the bioscrubber provides an effective sink to minimize feed fluctuations. The biodegradation keeps the carbon at maximum adsorption capacity, eliminating the need fro regeneration and reducing the required bed length and associated cost. In 1992, as part of the SITE Emerging Technology Program, a bench-scale bioscrubber treated an air stream with concentrations of 10 to 20 parts per million (ppm) toluene. The 11 month project demonstrated removal efficiencies in excess of 95 percent. Based on these results, the technology has been invited to participate in the SITE Demonstration Program. A pilot-scale unit with a 4-cubic-foot-per-minute capacity was being field tested in 1996.