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Biodestruction of Blended Residual Oxidant Streams

Biodestruction of Blended Residual Oxidant Streams

Jess Brown, Rick Wheadon, Edwin Hansen
Published In: 
Journal AWWA,  
October 2010

After bench- and pilot-scale studies demonstrated the effectiveness of a novel biological treatment process for removing oxidants from concentrate waste streams, an electrodialysis reversal pilot plant was used to remove perchlorate, arsenic, and total dissolved solids from groundwater. The resulting concentrate stream was blended with scalped municipal wastewater and treated in a fixed-bed (FXB) bioreactor through a process called BIOBROx®. The data showed that at an empty-bed contact time of 10 min and a 0.6 blend ratio of wastewater flow to total flow sustained perchlorate removal was below the method-reporting limit (4 µg/L) in the FXB bioreactor. Testing also showed that the system was robust with respect to process upsets and temperature variations. Ongoing full-scale testing is designed to optimize the process so that BIOBROx® effluent can be used directly for reuse applications after disinfection.

BIOBROx® treats oxidant-laden residuals
The results of the pilot study discussed in this article served as the basis for construction of a 3.8-mgd BIOBROx® facility at the Magna Water District in Salt Lake County, Utah (Photos by David Rowen © 2008 Magna Water District).

Brown, J., Wheadon, R., and Hansen E.. “Biodestruction of Blended Residual Oxidant Streams,” Journal of the American Water Works Association, 102(10):71-81, 2010.