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C. <br />Using the upper bound for liberated sulfur (50%), the sulfi;ir that flows with the <br />retorted shale oil product is conservatively estimated at 47.25 tons. <br />94.5 tons sulfiir * 50% liberation factor = 47.25 tons sulfur in shale oil product <br />It is assumed that all of the liberated sulfur will be converted to sulfiir dioxide <br />(S02) during combustion at the thermal oxidizer. Based on the difference in molecular <br />weight, 2 lbs of S02 will be generated for each lb of sulfur combusted. This yields an <br />estimated St)2 emission rate of 94.5 tons/yr. <br />47.25 tons sulfur * 2 lbs S02/lb S = 94.5 tons per year (tpy) S02 <br />Although the S02 emissiom shown above are based on 1000/ conversion of sulfa <br />to SO2, the thermal oxidizer will not be 100% efficient at converting sulftir compounds to <br />S02. Vendor literature suggests that the oxidizer conversion efficiency is around <br />99.99%. Any residual is assumed to be released as hydrogen sulfide (H2S). For <br />conservatism, it is assumed that the oxidizer conversion efficiency is 99.9% for the <br />emission calculations. With these assumptions, the H2S emissions. (i.e., residual sulfirr <br />not converted to SO2) is 100 lbs/yr. <br />47.25 tons sulfur * 0.001 * 2,000 lbs/ton * (34/32) = 100 lbs/yr H2S • <br />Mercury Emissions <br />Like the S02 emissions, mercury (Hg) emissions were also estimated using a <br />mass balance approach. Because mercury has a relatively low boiling point, it is assumed <br />that any mercury present in the shale would volatilize during the retorting process and be <br />released to the atmosphere. <br />AMSO's present information is that the mercury content of the oil shale is <br />100 pails per billion (ppb) or less. Based on these data, the mercury errussions during <br />AMSO's planned R&D test would be less than 1 lb/yr, assuming that all mercury in the <br />shale was released to the atmosphere. <br />4,200 ton/yr * 2,000 lb/ton * (100/1 x 10°) = 0.841b/yr <br />Thermal Oxidizer Conibustiou Emissions <br />The retort products (produced oil and produced gas), except for small quantities <br />retrieved for laboratory testing and analysis, will be routed to an on-site thermal oxidizer <br />for combustion. The oxidizer will convert most of the sulfur compounds associated with <br />the retort output to sulfur dioxide (S02). 0 <br />Page :Z0 of 46