Abstract
Denitrification characteristics of biological fluidized bed reactor were studied using methanol as a carbon source. Because glass beads have been used instead of a distribution plate at the bottom of the fluidized bed, the reactor has been able to be operated 1 year. When the concentration ratio TOC to NO3- -N (TOC ratio) was less than 1.0, denitrification efficiency decreased. The axial concentration distribution of MLSS in the fluidized bed was almost constant except at the bottom. The average biofilm thickness around the fluidizing particles was 0.1 mm. After being subjected to a cultivation method and a scanning electron microscopy, denitrifying bacteria was thought to be Hyphomicrobium sp.
