In-situ vitrification (ISV) organic-surrogate vapor emissions during a 1-ton pilot melt. Draft report

摘要

Pilot tests of a commercial soil vitrification process for entombing Animal/Chemical and Glass Hole area wastes were evaluated by incorporating perfluorocarbon tracers (PFTs) into aqueous and organic 'wastes' within bottles of the type buried in typical Brookhaven-type holes. The objective was to add sufficient known PFT quantities of two or more types in the aqueous and organic phases while, at the same time, surrounding the test pit with known emission rate PFT sources, one type in the soil and another type in the air, such that monitoring of the air above ground and below ground would allow computation of the fugitive emission rates from the process as it occurred. Hood off-gas PFT concentrations were also to be monitored in order to verify the fraction present. The output was to be the percentage escape (i.e., not captured by the hood) of pit aqueous and organic phases as the vitrification process proceeded. The actual melt commenced at 1350 on Monday 24 June 1996 and continued for just short of 48 hours. By the next day it was clear from the real-time PFT analyzer that above-ground fugitive emissions were not assessable because substantial PFT vapors were fumigating the area from the exhaust stack of the ISV hood's soil vapor extraction (SVE) processing system. That sampling component was then switched to the stack to compare hood off-gas concentrations before and after the charcoal filtering.