Abstract:
INSITU CHEMICAL OXIDATION (ISCO) FOR MGP SITES: TECHNOLOGY DEVELOPMENT, APPLIED RESULTS AND GUIDANCE DEVELOPED FROM AN EPRI FIELD DEMONSTRATION PROJECT USING ACTIVATED PERSULFATE.

PARIKH, Jaydeep M., XDD, 1275 Glenlivet Dr., Suite 100, Allentown, PA 18106

SMITH, Brant A., XDD, 22 Marin Way, Stratham, NH 03885

COLEMAN, Andrew Jay, Electric Power Research Institute (EPRI), 3420 Hillview Avenue, Palo Alto, CA 94303-0813

EPRI and XDD collaborated on extensive bench scale testing of soils from two former MGP sites and performed an ISCO field demonstration using activated persulfate at one of the sites. The testing provided very useful data on the soil properties that will prove useful to the industry in selecting appropriate sites for ISCO application and for appropriately setting expectations on projected ISCO performance.

Increasing regulatory pressure to cleanup MGP sites has resulted in an evaluation of potential remedial technologies. ISCO is a promising insitu technology able to treat MGP residuals in a relatively short time frame. Site cleanup goals could vary from state to state and site to site; e.g., numerical goals for soil/groundwater, sourcezone mass reduction, product mobility elimination and groundwater mass flux reduction. The industry needs to know how to best use ISCO at a site (e.g., as an interim step, as a final step to achieve closure), what the technology limitations are, and what ISCO can cost-effectively achieve.

The bench testing was performed using both iron and alkali based systems to activate the persulfate. The testing demonstrates the variability of soil sorption for MGP residuals and the associated impacts on the expected ISCO performance. The field scale testing included a single application of alkali activated persulfate. Grab and composite soil samples were collected to evaluate the application performance. In addition Synthetic Precipitation Leaching Procedure (SPLP) tests were performed on the soils to evaluate the effects of the ISCO on the impacts of treated and nontreated residuals on groundwater. Results indicate that based on appropriate evaluation of soil properties and product distribution, using persulfate can significantly reduce PAH levels in soils and groundwater at MGP sites.

For more information, please contact Mike Marley at Marley@xddllc.com or 603.778.1100.