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DESIGN SCALE-UP SUITABILITY FOR AIR-STRIPPING COLUMNS (JOURNAL VERSION)
Citation:
Wallman, H. AND M. Cummins. DESIGN SCALE-UP SUITABILITY FOR AIR-STRIPPING COLUMNS (JOURNAL VERSION). U.S. Environmental Protection Agency, Washington, D.C., EPA/600/M-86/028 (NTIS PB87119103).
Description:
An investigation was conducted to determine the suitability of a design scale-up from pilot-scale to full-scale air-stripping columns used in the removal of volatile organic compounds from contaminated water supplies. Forty-eight experimental runs were made in packed columns of four different diameters (6, 12, 24, and 57 in.) at air-to-water ratios from 5:1 to 50:1. Water was used from the Village of Brewster, New York, well fields; this water was contaminated with tetrachlorethylene, trichloroethylene and cis-1,2 dichloroethylene. The experimental mass transfer coefficients were compared with values calculated from the Onda mass transfer coefficient model. Generally, the two values were in reasonably good agreement. Based on these results, it appears that the Onda model tends to give a conservative design for a full-scale system. Using a cost model developed by the U.S. Environmental Protection Agency (EPA), the 2-in. plastic TRI-PACKS (of the packing types tested) gave the most cost-effective design for a full-scale system. No operational problems were encountered during subfreezing weather other than rupture of some sample lines.