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ACTIVATED CARBON THIN-LAYER PLACEMENT AS AN IN SITU MERCURY REMEDIATION TOOL IN A PENOBSCOT RIVER SALTMARSH
Gilmour, C., T. Bell, A. Soren, G. Riedel, G. Riedel, K. Kopec, D. Bodaly, and U. Ghosh.
Science of the Total Environment 621:839-848(2018)

The study was a 2-year, fully crossed small pilot study, with four treatments (activated carbon [AC], biochar, ferrous chloride, and lime) and unamended controls at two sites. Porewater methylmercury (MeHg) concentrations were the main endpoint, with impacts on sediment biogeochemistry as a secondary study goal. AC-based SediMite™ reduced MeHg, and to a lesser extent total Hg, in surficial pore waters. AC reduced MeHg concentrations by >90% after one month and continued through about a year. For total Hg, AC yielded about a 70% reduction at one month and 50-65% reduction at 8 months. Biochar provided lower and more variable reduction in porewater MeHg but was not effective in reducing total Hg. Biochar amendment also increased soil MeHg. Neither ferrous chloride nor lime amendments reduced porewater Hg or MeHg levels. About 50% of AC treatment applied as SediMite pellets was retained in marsh soils after one year. For additional information, see Chapter 19 in the Penobscot River Mercury Study at http://www.penobscotmercurystudy.com/documents/court-orders/652-phase-ii-final-report_chapter19.pdf.



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