Two Novel Methods for Enhancing Source Zone Bioremediation: Direct Hydrogen Addition and Electron Acceptor Diversion
ABSTRACT: Two novel methods for enhancing bioremediation in DNAPL source zones are now being developed. The first method, direct hydrogen addition (i.e., electron donor addition without the use of fermentation substrates), is now being tested in the field by the Technology Transfer Division at the Air Force Center for Environmental Excellence (AFCEE). This approach permits the direct delivery of a relatively large mass of electron donor to DNAPL source zones undergoing biodegradation. The second method, electron acceptor diversion, is an emerging technology where competing electron acceptors are diverted around the source zone, thereby greatly increasing the naturallyoccurring rate of reductive dechlorination in the source zone. This approach may have the potential to increase the naturally-occurring rate of DNAPL mass destruction at many sites without any long-term operating costs except monitoring.