Minergy GFT Permitting Feasibility Report


Courtesy of Minergy Corporation Limited

A 39-mile stretch of the Fox River and portions of Green Bay in northeastern Wisconsin (the Fox River site) are contaminated with polychlorinated biphenyl (PCB) laden sediment. The contamination was caused by historical effluent discharges from paper mills manufacturing and/or recycling carbonless paper that utilized dyes dissolved in PCBs. PCBs are the primary contaminant of concern; however other contaminants of concern (COCs) identified in the baseline risk assessment include dioxins/furans, DDT, Deildrin, arsenic, lead, and mercury. A Remedial Investigation/Feasibility Study (RI/FS) has been performed under the direction of the Wisconsin Department of Natural Resources (DNR) and a draft report was issued in 1999. The study concluded that a total of approximately 7.25 million cubic yards of sediment requires removal in order to meet a clean up goal of 1 ppm PCBs. A proposed Remedial Action Plan for the lower Fox River and Green Bay was published in October 2001.

DNR contracted with Minergy Corporation (Minergy) to investigate thermal treatment technology alternatives for Fox River site sediment remediation. Based on an initial study of sediment physical and chemical properties, Minergy recommended vitrification of the sediment in an oxyfuel fired glass furnace (Glass Furnace Technology or GFT). In cooperation with DNR and EPA’s Superfund Innovative Technology Evaluation (SITE) group, Minergy has completed
bench-scale and pilot-scale testing of the GFT process and the results are favorable. In general, completed studies have demonstrated that the PCB contaminated river sediment can be successfully converted into a vitrified glass aggregate product meeting ASTM specifications for blended cements. The process and environmental performance data generated during the pilotscale test also indicate that a commercial-scale GFT application is feasible.

Minergy was contracted by DNR to perform a review of relevant state and federal permitting requirements for a full scale sediment melter facility. The results of that study are presented in this report.

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