Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

84-6 Increasing Tile Drainage Nitrate Removal in Bioreactors By Treating More Water.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Enhanced-Denitrification Technologies (includes student competition)

Monday, October 23, 2017: 2:50 PM
Tampa Convention Center, Room 4

Gary W. Feyereisen, 1991 Upper Buford Circle, USDA-ARS, St. Paul, MN
Abstract:
Denitrifying woodchip bioreactors are sized to treat a portion of subsurface drainage system peak flow, so during larger events substantial bypass flow remains untreated. Over sizing bioreactors to capture a higher portion of peak flow can create conditions under which unintended consequences could occur. Conversely, under sizing them results in lost opportunity to treat water. A potential solution for treating additional water is to use a cascading series of bioreactor cells that come on line as overflow is initiated from the previous cell. A large, three-cell bioreactor of the described design has been engineered, installed, and operated in southern Minnesota on a 266-ha watershed. This presentation will highlight the instrumentation and early flow and water quality results from the first year of operation.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Enhanced-Denitrification Technologies (includes student competition)

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