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AWWA ACE70869
- Autotrophic Hydrogen-Based Packed Column Reactor for Perchlorate and Nitrate Removal from Groundwater
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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This powerpoint presentation begins by providing a brief overview of perchlorate (ClO<sub>4</sub><sup>-</sup>) and nitrate (NO<sub>3</sub><sup>-</sup>) ascommon groundwater contaminants in the western United States. A U.S. Environmental Protection Agency (USEPA) grant to the Metropolitan Water District of Southern California funded this study ofbiological perchlorate removal from the City of Pasadena groundwater wells. Study objectives were to identify, investigate and resolve some of theprimary challenges facing the application of H<sub>2</sub>-based biological treatment for the removal ofperchlorate and nitrate from groundwater including: start-up; process stability; response to perturbations; use of hydrogen gas; and, regulatory acceptance. The pilot study included: packed column reactor (PCR) (8 ft bed depth, 1 ft diameter, 1gpm influent flow); non-proprietary, standard design of an upflow reactor; eight month duration. PCR process configuration is presented, along with hydrogen demand calculation, and PCR start-up. Lessons learned are provided for water quality and reactor system. Includes tables, figures.
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