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TECHNICAL REPORTS
Ground Water Quality

Use of Mini-Sprinklers to Strip Trichloroethylene and Tetrachloroethylene from Contaminated Ground Water

^a Agricultural and Environmental Services Laboratories, Pesticide and Hazardous Wastes Laboratory, Univ. of Georgia, 2300 College Station Road, Athens, GA 30605
^b U.S. Forest Service, Savannah River Site, P.O. Box 700, New Ellenton, SC 29809
^c Bechtel Savannah River Inc., Bldg. 730-2B, Aiken, SC 29808

^* Corresponding author (pbush{at}arches.uga.edu)

Received for publication February 6, 2002. Three low-volume mini-sprinklers were tested for their efficacy to strip trichloroethylene (TCE) and tetrachloroethylene (PCE) from water. Deionized water spiked with TCE and PCE was pumped for approximately 1 h at 0.19 to 0.21 MPa (28 to 30 lb in^-2) through a mini-sprinkler supported on top of a 1.8-m-tall riser. Water was collected in collection vessels at 0.61 and 1.22 m above the ground on support columns that were spaced at 0.61-m intervals from the riser base, and samples were composited per height and distance from the riser. Overall, air-stripping reduced dissolved concentrations of TCE and PCE by 99.1 to 100 and 96.9 to 100%, respectively, from mean influent dissolved concentrations of 466 to 1675 µg L^-1 TCE and 206 to 940 µg L^-1 PCE. In terms of mass removed, the mini-sprinklers removed TCE and PCE at a rate of approximately 1400 to 1700 and 700 to 900 µg L^-1, respectively, over a 1-h test period. Mini-sprinklers offer the advantages of (i) easy setup in series that can be used on practically any terrain; (ii) operation over a long period of time that does not threaten aquifer depletion; (iii) use in small or confined aquifers in which the capacity is too low to support large irrigation or purging systems; and (iv) use in forests in which the small, low-impact droplets of the mini-sprinklers do not damage bark and in which trees can help manage (via evapotranspiration) excess waste water.

Abbreviations: PCE, tetrachloroethylene • RPD, relative percent difference • TCE, trichloroethylene • VOC, volatile organic compound

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This Issue in Journal of Environmental Quality

JEQ 2003 32: 745-750. [Full Text]