Remediation of DNAPL Through Sequential In Situ Chemical Oxidation and Bioaugmentation

摘要

The principal benefit of in situ chemical oxidation (ISCO) using permanganate is that it aggressively enhances dissolution and destruction of the target contaminants within a relatively short period of time (i.e., months to years). But the economic benefits of this technology diminish as the mass of target chemicals decreases. To date, the most effective applications of ISCO have been to rapidly destroy the readily accessible target chemical mass within the source area. However, ISCO potentially can be coupled with a less costly mass removal technology such as in situ bioremediation (ISB), thereby reducing the overall remediation costs. The main objectives of this project were to assess the technical feasibility of sequential application of these technologies (ISCO and ISB) to evaluate the effects of this combined treatment on overall cost and performance, and to identify the optimal timing of the transition from ISCO to ISB. Technical problems limited the ability to meet these objectives fully--biofouling caused significant downtime during operations and operations were severely impacted by a series of hurricanes.