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NASA/California Institute of Technology Jet Propulsion Laboratory, Ion Exchange Bed RPasadena, CASource: Executive Summary, Pilot Study conducted by Calgon Carbon Corporation at JPL, 1998-1999 Project Summary: The following text was excerpted from Executive Summary, Pilot Study conducted by Calgon Carbon Corporation at JPL, 1998-1999: A study funded by National Aeronautics and Space Administration (NASA) to demonstrate the removal of trichloroethylene (TCE), 1,2-dichloroethane (DCA), carbon tetrachloride (CCl4) and perchlorate (ClO4-) from groundwater at Jet Propulsion Laboratory (JPL) has recently been completed by Calgon Carbon Corporation. Calgon Carbon successfully utilized its integrated granular activated carbon (GAC) and ISEP+TM treatment systems for the removal of the contaminants from ground water during the study conducted between September 15, 1998 -- March 5, 1999. Results indicated that the organic contaminants were reduced to low levels and perchlorate in various inlet concentration levels (up to about 1200 ppb) was removed to nondetectable levels (<4 ppb) in treated water. In addition, the system was successful in removing other anionic species such as nitrate and sulfate from the groundwater to low levels in treated water, while producing minimal amounts of regeneration waste. The integrated ISEP+TM system (comprising continuous ion exchange system (ISEP® and perchlorate and nitrate destruction module (PNDM) was successfully demonstrated for about 10 days. Perchlorate and nitrate present in regeneration waste from ISEP® were destroyed and substantial amounts of sulfate (exceeding 96%) was removed in the PNDM. The regenerant (brine), thus "purified" in the PNDM, was recycled and was effective in regenerating the resin for the period of the study. The overall process waste from the integrated ISEP+TM system for treating up to about 1200 ppb perchlorate was about 0.16%, based on the volume of feed water. Over one-half of a million gallons of ground water at the JPL site was successfully treated to produce a high quality water with non-detectable TCE, DCA and CCL4 concentrations, non-detectable perchlorate (< 4 ppb), low nitrate (<2 ppm) and sulfate (<2 ppm) concentrations. Testing at various process conditions enabled Calgon Carbon to optimize each of the process units of the ISEP+TM system and confirm steady-state operation. Sufficient operating data were obtained from this pilot study to design full-scale ISEP® system and to further develop the ISEP+TM integrated system for the complex treatment needs of JPL and other sites. Additional Info Source: Executive Summary, Pilot Study conducted by Calgon Carbon Corporation at JPL, 1998-1999 Wagner, Norman, and Charles Drewry, 2000. "Commercial Systems Treating both High and Low Strength Perchlorate Applications Utilizing Ion Exchange" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas |
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