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OPERATION OF IN SITU BIOLOGICAL SYSTEM FOR TREATMENT OF HEXAVALENT CHROMIUM AT THE SELMA PRESSURE TREATING SUPERFUND SITEYurovsky, M., D. Cacciatore, L. Hudson, D.P. Leigh, C. Bhullar, and W. Shaheen. In Situ and On-Site Bioremediation 2009: Proceedings of the 10th International In Situ and On-Site Bioremediation Symposium, 5-8 May, Baltimore, Maryland. Battelle Press, ISBN: 9780981973012, CD-ROM, 2009
Groundwater at Selma Pressure Treating Superfund Site is affected by
discharges of hexavalent chromium. A full-scale in situ bioremediation (ISB)
recirculation system was implemented to convert soluble hexavalent chromium to
trivalent in the extended plume. Treatment involved adding a biodegradable
substrate (molasses) to the injected groundwater in a 450,000-square-ft
treatment area where contamination extended vertically from the top of the
groundwater at 45 feet to 120 feet below ground surface (bgs). Injection well
biofouling was counteracted by delivering the substrate in pulses, by cleaning
injection wells with a hydrogen peroxide solution and compressed air, and by
daily injections of disinfectant solution containing chlorine dioxide (a
biocide solution). In 21 months of continuous around-the-clock operation, 155
million gallons of groundwater was recirculated, and ~250 pounds of hexavalent
chromium was converted. The concentration of hexavalent chromium has decreased
from as much as 3,000 ug/L to less than 50 ug/L (MCL level).
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