Document Type
Conference Proceeding
Conference
9 th International Drainage Symposium
Publication Date
6-2010
City
Quebec City, QC
Abstract
Denitrification bioreactors for nitrate removal in agricultural drainage have recently gained attention for their low cost and effectiveness. While research continues to investigate the optimal sizing of these systems, little work has been done on the optimal design geometry (Length to width ratio and cross sectional shape). To address this lack, pilot-scale (1/10th scale) work performed in Iowa during the summer of 2009 explored three shapes of potential bioreactor designs. The objective was to study the nitrate removal effectiveness of each design at various retention times. The pilot bioreactors had a standard volume (0.71 m3) and depth (0.61 m) and different dimensions of 0.76 m x 1.5 m (rectangle), 0.38 m x 3.0 m (channel), and 1.5 m x 1.2 m (trapezoidal). Steady state experiments consisted of the bioreactors being allowed to run at a given retention time for several days/weeks before being changed to a different retention time. A hydrograph flush experiment simulated a drainage hydrograph moving through the bioreactor over the course of a few days. Preliminary results indicated little significant difference between the designs though the channel design seems to provide the most consistent results between the two experiments. Further analysis of this data is expected to guide future full-scale denitrification bioreactor designs.
Copyright Owner
American Society of Agricultural and Biological Engineers
Copyright Date
2010
Language
en
Recommended Citation
Christianson, Laura E.; Helmers, Matthew J.; and Bhandari, Alok, "Bioreactor Design Geometry Effects on Nitrate Removal" (2010). Agricultural and Biosystems Engineering Conference Proceedings and Presentations. 262.
https://lib.dr.iastate.edu/abe_eng_conf/262
Comments
This is an ASABE Meeting Presentation, Paper No. IDS-CSBE-100073.