Xiao L W, Rodgers M, Mulqueen J
Department of Civil Engineering, National University of Ireland, Galway, Ireland.
Bioresour Technol. 2007 Mar;98(4):739-44. doi: 10.1016/j.biortech.2006.04.015. Epub 2006 Jun 12.
Recirculation of fully nitrified effluent from a laboratory horizontal-flow biofilm reactor (HFBR) to a mixed pre-denitrification reactor (DR) was used to remove organic carbon and nitrogen from synthetic dairy wastewater. Three recirculation ratios of 2, 4, and 6 were examined in this study and the average filtered chemical oxygen demand (CODf) and total nitrogen (TN) removals were up to 97.4% and 85.5%, respectively, at 11 degrees C. In the DR, the nitrate nitrogen removal efficiencies and rates were 86-96% and 22-34 g N/m3 d. In the HFBR, the ammonium nitrogen removal rates were 293-337 mg N/m2 d.
