Pilot-Scale Testing of Fixed-Film, Fluidized-Bed Bioreactors for Denitrification of Process Wastewaters

摘要

Fluidized-bed bioreactors were tested as processes for denitrifying wastewaters at flows of 23 m exp 3 /d (0.2-m-diam column) and 166 m exp 3 /d (0.5-m-diam column). As average nitrate concentrations were increased from approximately 1000 to 2500 g/m exp 3 , denitrification rates increased from 25 to 48 kg nitrate-nitrogen/d.m exp 3 for 11-min hydraulic retention times. Two 0.2-m-diam bioreactors operated in series on influent nitrate concentrations of 2000 g/m exp 3 could produce nitrate effluent concentrations of less than 44 g/m exp 3 . (ERA citation 07:022212)