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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1562 K. A. Magrini, et al.<br />

ysis <strong>of</strong> the inlet and outlet air streams. A portable light intensity monitor was used to measure<br />

the global horizontal light intensity at the surface <strong>of</strong> the photoreactor. The calibrated<br />

radiometer was mounted on the reactor framework which faced south at an angle <strong>of</strong> 40 o to<br />

the horizon. Two blowers in series were used to draw contaminated air into the system. The<br />

blowers were located at the end <strong>of</strong> the air handling system so that the entire system was<br />

maintained under slight negative pressure. Because TCE oxidation can produce intermediates<br />

such as phosgene, (Nimlos et. al, 1993; Read et. al., 1996; Fan and Yates, 1996), keeping<br />

the system under vacuum prevented release <strong>of</strong> any toxic vapors. The exhaust gases from<br />

the blower were returned for final treatment by a caustic contacting tower. Any hydrochloric<br />

acid and phosgene formed from TCE oxidation were neutralized and hydrolyzed respectively<br />

by the caustic scrubber.<br />

The contaminated airstream provided by the air stripper unit contained volatile organic<br />

compounds as analyzed from Summa canister tests by Air Toxics, Ltd. using EPA<br />

method TO-14. These compounds, listed in Table 22.4.1, consisted primarily <strong>of</strong> trichloroethylene<br />

and trace quantities <strong>of</strong> dichloromethane, 1,1-dichloroethene, cis-1,2dichloroethane,<br />

chlor<strong>of</strong>orm, carbon tetrachloride, and benzene. The other compounds present<br />

in the outlet presumably formed during treatment.<br />

Table 22.4.1. Results from the Summa canister tests <strong>of</strong> inlet and outlet reactor air<br />

streams during the McClellan tests. The two inlet and two outlet samples were taken<br />

sequentially and represent approximately replicate samples<br />

Compound Inlet 1, ppbv Inlet 2, ppbv Outlet 1, ppbv Outlet 2, ppbv<br />

Detection<br />

limit, ppbv<br />

Chloromethane ND ND 4.8 4.1 1.5-30<br />

Dichloromethane 36 36 30 32 1.5-30<br />

1,1-Dichloroethane ND ND 17 17 1.5-30<br />

1,1-Dichloroethene 200 200 ND ND 1.5-30<br />

cis-1,2-Dichloroethane 220 240 6 2.2 1.5-30<br />

Chlor<strong>of</strong>orm 250 260 280 280 1.5-30<br />

Carbon tetrachloride 700 730 790 790 1.5-30<br />

Benzene 170 190 120 110 1.5-30<br />

1,2-Dichloroethane ND ND 12 ND 1.5-30<br />

Trichloroethylene 13000 13000 660 280 1.5-30<br />

Acetone ND ND 84 69 9.8-120<br />

1,4-Dioxane ND ND 10 ND 9.8-120<br />

22.4.2.2 Paint booth application<br />

For the paint solvent application, a slipstream <strong>of</strong> a paint booth vent located at Fort Carson<br />

was analyzed to determine the components present with rapid scan gas chromatograph. On<br />

any operational day, several paint types are sprayed. The solvent emissions content thus<br />

varies during painting operations. In general, the amounts and types <strong>of</strong> solvent emissions<br />

from the Fort Carson paint booth are listed in Table 22.4.2.

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