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Cascade Air Stripping: Techno-Economic Evaluation of a New Ground Water Treatment Process
Authors:N. Nirmalakhandan  G.L. Peace  A.R. Shanbhag  R.E. Speece
Affiliation:Dr. N. Nirmalakhandan received his B.S. degree from University of Sri Lanka and M.S. and Ph.D. degrees from Drexel University, Pennsylvania. He is a registered professional engineer and is currently an associate professor in the Civil, Agricultural and Geological Engineering (CAGE) Department of New Mexico State University (Las Cruces, NM 88003). His research areas include fate, transport, treatment, and mangement of organic contaminants. He has published several papers in these areas in leading environmental engineering journals. His work on the cascade air-stripping technology has also been widely published, and has been supported by the American Water Works Association Research Foundation and New Mexico Water Resources Research Institute.;G.L. Peace is a recent graduate of the CAGE Department, New Mexico State University (Las Cruces, NM 88003). The field studies presented in this paper are based on his M.S. thesis work.;A. Shanbhag is a graduate student in the CAGE Department, New Mexico State University (Las Cruces, NM 88003). The techno-economic analysis presented in the paper is based on his M.S. thesis work.;Dr. R.E. Speece is centennial professor in the Civil and Environmental Engineering Department at Vanderbilt University (Nashville, TN 37235). He has been involved in the development of the cascade air-stripping process from its inception.
Abstract:A simple modification of the conventional air-stripping process introduced as cascade air stripping is proposed for efficient and economical removal of semivolatile and low volatility contaminants from ground water. The technical feasibility and economic viability of this process are evaluated using field test results and cost model simulations. The field tests enabled the process model to be verified at various water flow rates ranging from 150 gpm to 400 gpm. The field study also demonstrated the feasibility of the proposed system at a near full-scale level. Cost models were used to compare the proposed process to conventional air stripping and granular-activated carbon adsorption in removing a range of contaminants. This analysis showed that the treatment cost (ø/1000 gal) of cascade air stripping is about 15 percent lower than conventional air stripping and about 40 percent lower than granular-activated carbon adsorption.
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