Northeast Research and Demonstration Farm
Denitrification bioreactors for removal of nitrate in tile drainage are new water quality technology that has rapidly gained interest in Iowa. A bioreactor is composed of an excavated trench filled with woodchips that are colonized by denitrifying bacteria. As drainage waters containing nitrate flow by these “good” bacteria, they convert the nitrate in the water to nitrogen gas. A critical component in evaluating the performance of these treatment systems is the documentation not only of nitrate concentrations in the drainage water, but also the flow rate and volume of the water treated in the bioreactor.
Iowa State University
Christianson, Laura E.; Helmers, Matthew J.; and Pederson, Carl H., "Denitrification Bioreactor in Northeast Iowa" (2011). Iowa State Research Farm Progress Reports. 246.