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Kinetics of nitrate and perchlorate reduction in ion exchange brine using the membrane biofilm reactor (MBfR)
VAN GINKEL, STEVEN W., C. H. AHN, M. BADRUZZAMAN, D. J. ROBERTS, S. G. LEHMAN, S. S. ADHAM, AND B. E. RITTMANN. Kinetics of nitrate and perchlorate reduction in ion exchange brine using the membrane biofilm reactor (MBfR). WATER RESEARCH. Elsevier Science Ltd, New York, NY, 42(15):4197-4205, (2008).
Several sources of bacterial inocula were tested for their ability to reduce nitrate and perchlorate in synthetic ion-exchange spent brine (3-4.5% salinity) using a hydrogen-based membrane biofilm reactor (MBfR). Nitrate and perchlorate removal fluxes reached as high as 5.4 g N m-2d-1 and 5.0 g ClO4 m-2d-1, respectively, and these values are similar to values obtained with freshwater MBfRs. Nitrate and perchlorate removal fluxes decreased with increasing salinity. The nitrate fluxes were roughly first order in H2 pressure, but roughly zero-order with nitrate concentration. Perchlorate reduction rates were higher with lower nitrate loadings, compared to high nitrate loadings; this is a sign of competition for H2. Nitrate and perchlorate reduction rates depended strongly on the inoculum. Inoculum that was well acclimated (years) to nitrate and perchlorate gave markedly faster removal kinetics than cultures that were acclimated for only a few months. These results underscore that the most successful MBfR bio-reduction of nitrate and perchlorate in ion-exchange brine demands a well acclimated inoculum and sufficient hydrogen availability.
URLs/Downloads:KINETICS OF NITRATE AND PERCHLORATE REDUCTION IN ION EXCHANGE BRINE USING THE MEMBRANE BIOFILM REACTOR (MBFR) Exit
Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
WATER SUPPLY AND WATER RESOURCES DIVISION
TREATMENT TECHNOLOGY EVALUATION BRANCH