Bioreduction of nitrate in groundwater using a pilot-scale hydrogen-based membrane biofilm reactor
A long-term pilot-scale H2-based membrane biofilm reactor (MBfR) was tested for removal of nitrate from actual groundwater. A key feature of this second-generation pilot MBfR is that it employed lower cost polyester hollow fibers and still achieved high loading rate. The steady-state maximum nitrate surface loading at which the effluent nitrate and nitrite concentrations were below the Maximum Contaminant Level (MCL) was at least 5.9 g·N·(m2·d)−1, which corresponds to a maximum volumetric loading of at least 7.7 kg·N·(m3·d) −1. The steady-state maximum nitrate surface area loading was higher than the highest nitrate surface loading reported in the first-generation MBfRs using composite fibers (2.6 g·N·(m2·d)−1). This work also evaluated the H2-utilization efficiency in MBfR. The measured H2 supply rate was only slightly higher than the stoichiometric H2-utilization rate. Thus, H2 utilization was controlled by diffusion and was close to 100% efficiency, as long as biofilm accumulated on the polyester-fiber surface and the fibers had no leaks.
Keywordsdenitrification groundwater treatment hydrogen membrane biofilm reactor (MBfR) polyester fiber
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- 1.Gros H, Schnoor G, Rutten P. Biological denitrification process with hydrogen-oxidizing bacteria for drinking water treatment. Water Supply, 1998, 6: 193–198Google Scholar
- 5.Nerenberg R, Rittmann B E, Najm I. Perchlorate reduction in a hydrogen-based membrane-biofilm reactor. Journal of American Water Works Association, 2002, 94(11): 103–114Google Scholar
- 7.Nerenberg R, Rittmann B E. Hydrogen-based, hollow-fiber membrane biofilm reactor for reduction of perchlorate and other oxidized contaminants. Water Science and Technology, 2004, 49(11–12): 223–230Google Scholar
- 8.Rittmann B E, Nerenberg R, Lee K C, Najm I, Gillogly T E, Lehman G E, Adam S S. The hydrogen-based hollow-fiber membrane biofilm reactor (HFMBfR) for reducing oxidized contaminants. Water Science & Technology: Water Supply, 2004, 4(1): 127–133Google Scholar
- 9.Adham S, Gillogly T, Lehman G, Rittmann B E, Nerenberg R. Membrane Biofilm Reactor Process for Nitrate and Perchlorate Removal. AwwaRF, Denver, Colorado, USA, 2004Google Scholar
- 11.Standard Methods for the Examination of Water and Wastewater. 20th ed. Washington DC: American Public Health Association/ American Water Works Association/Water Environment Federation, 1988Google Scholar
- 12.Method 300.1 Determination of inorganic anions in drinking water by ion chromatography. Washington DC: U.S. Environmental Protection Agency, 1993Google Scholar
- 13.Rittmann B E, McCarty P L. Environmental Biotechnology: Principles and Applications. New York: McGraw-Hill Companies, Inc, 2001Google Scholar
- 14.Snoeyink V L, Jenkins D. Water Chemistry. New York: Wiley, Inc, 1980Google Scholar