RESULTS OF A 2-YEAR IN-SITU BIOVENTING DEMONSTRATION

A full-scale bioventing demonstration was recently completed at a larg e diesel spill site located at a major railroad facility in Nebraska. An estimated 11,500 cubic meters of soil are being treated in this dem onstration. During this two-year demonstration, both in situ respirati on rates and volatilization were routinely monitored to estimate total fuel removal rates, This paper discusses the relative contributions o f biodegradation and volatilization in this bioventing application and presents two-year soil sampling results which indicate that significa nt fuel remediation has occurred at the site. Both capital and operati ng costs for this system are very competitive and will be detailed in this document.