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GEOCHEMICAL AND ISOTOPE STUDY OF TRICHLOROETHENE DEGRADATION IN A ZERO-VALENT IRON PERMEABLE REACTIVE BARRIER: A TWENTY-TWO-YEAR PERFORMANCE EVALUATION
Wilkin, R.T., T.R. Lee, M.R. Sexton, S.D. Acree, R.W. Puls, D.W. Blowes, C. Kalinowski, J.M. Tilton, and L.L. Woods.
Environmental Science & Technology 53(1):296-306(2019)

This study provides a 22-yr record of in situ degradation of chlorinated organic compounds by a granular iron permeable reactive barrier (PRB). Groundwater concentrations of TCE entering the PRB were as high as 10670 µg/L. Treatment efficiency ranged from 81 to >99%, and TCE concentrations from <1 µg/L to 165 µg/L were detected within and hydraulically down-gradient of the PRB. After 18 years, effluent TCE concentrations remained above the MCL along segments of the PRB exhibiting upward trending influent TCE. Methanogenesis is a sink for inorganic carbon in ZVI PRBs that competes with carbonate mineralization, and this process is important for understanding pore-space clogging and longevity of iron-based PRBs.



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