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Title: Removal of N-Nitrosodimethylamine from Rocky Mountain Arsenal waters using innovative adsorption technologies
Authors: Fleming, Elizabeth C.
Pennington, Judith C.
Francingues, Norman R.
Felt, Deborah R.
Wachob, Benjamin G.
Howe, Robert A.
Colsman, Mark R.
Garrett, Kevin E.
Keywords: Adsorption
Separation (Technology)
Rocky Mountain Arsenal (Colo.)
Publisher: Environmental Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station.
Series/Report no.: Technical Report ; EL-96-11
Abstract: The Basin A Neck (BANCS) and North Boundary containment systems (NBCS) are two granular-activated carbon containment systems located at the Rocky Mountain Arsenal (RMA) to intercept contaminants before they flow offpost in groundwater. The BANCS and NBCS are not effective in removing N-nitrosodimethylamine (NDMA) from RMA waters. Analysis of BANCS and NBCS influent and effluent samples, ranging from 0.04 to 5.0 μg/ℓ NDMA, indicates NDMA may be merely recirculated through the plants without appreciative removal. The Office of the Program Manager for Rocky Mountain Arsenal requested that the U.S. Army Engineer Waterways Experiment Station evaluate alternative adsorbents that may be effective in removal of NDMA. If a suitable adsorbent were identified, alterations to existing systems could then be easily made·to remove NDMA prior to discharge. Screening tests indicated that NDMA could be reduced from 100 μg/ℓ to less than 1 μg/ℓ. Isotherm evaluations at influent concentrations of 5 μg/ℓ verified results of the screening tests and indicated tliat NDMA could be reduced below the current analytical detection limit of 0.033 μg/ℓ. The optional adsorbents, to be further evaluated in column studies, were Calgon coconut shell carbon, Calgon Filtersorb 400, Ambersorb 572, and Ambersorb 563. Preliminary tests evaluated metals complexation, hydrolysis, and physisorption processes. Based on preliminary tests, adsorbents were selected for isotherm studies using liquid scintillation techniques. Results of isotherm tests were verified and four absorbents selected for further evaluation in column studies.
Description: Technical Report
Gov't Doc #: Technical Report EL-96-11
Rights: Approved for Public Release; Distribution is Unlimited
Size: 69 pages/3.077 Mb
Appears in Collections:Technical Report

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