OPERATION OF A FLUIDIZED-BED DENITRIFICATION BIOREACTOR

摘要

A fluidized-bed denitrification process has been developed by the Oak Ridge National Laboratory. Bacteria are allowed to grow and attach themselves to 0.25 - 0.60-mm-OD coal particles, and nitrate-containing solution is pumped up through the column at a velocity sufficient to fluidize the bacteria-coated coal particles. The denitrification bacteria convert the nitrate ions to nitrogen gas.nA 10-cm-ID column has been operated by Oak Ridge Y-12 Plant personnel to test the scale-up and operational characteristics of the fluidized bed process. The reactor consists of a tapered bottom section- for flow distribution, several straight 10-cm-ID cylindrical sections, and a tapered top section for solid/liquid disengaging.