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Water Science & Technology: Water Supply Vol 12 No 2 pp 227–233 © IWA Publishing 2012 doi:10.2166/ws.2012.138 Comparing heterotrophic and hydrogen-based autotrophic denitrification reactors for effluent water quality and post-treatmentYouneng Tang, Michal Ziv-El, Kerry Meyer, Chen Zhou, Jung Hun Shin, Chang Hoon Ahn, James McQuarrie, Daniel Candelaria, Paul Swaim, Rick Scott and Bruce E. RittmannSwette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, AZ 85287-5701, USA E-mail: Rittmann@asu.eduCH2M Hill, 9193 S. Jamaica St., Englewood, CO 80112, USA City of Glendale, 7070 West Northern Avenue, Glendale, AZ 85303, USA ABSTRACT This work compares a pilot-scale H2-based membrane biofilm reactor (MBfR) and a pilot-scale packed-bed heterotrophic reactor (PBHR) for denitrification of nitrate-contaminated groundwater. The comparison includes the effluent water quality of the denitrification reactors (NO3−, NO2−, dissolved oxygen, SO42−, (biodegradable) dissolved organic carbon, heterotrophic plate counts (HPC), turbidity, NH4+, and pH), and the impact of post-treatment on water quality. At the same nitrate carrier-surface loading, effluent water quality was generally better directly from the MBfR than from the PBHR. However, post treatment including an ozone-contact tank and a post-filter brought the finished-water quality for both systems to roughly the same level, which met all drinking water standards except for HPC. Keywords: autotrophic denitrification; heterotrophic denitrification; post treatment; water quality eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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