In order to remove NOx from boiler flue gas which contains O2and SO42-fromwaste water after absorbing SO2,effectively, the aerobic removal of NOx using abiotrickling filter (BF) and anaerobic removal of SO42-using an upflow anaerobicsludge blanket (UASB) reactor were studied. The enrichment of denitrifying bacteria(nitrifying bacteria and denitrifying bacteria) and sulfate reducing bacteria (SRB)were successfully obtained from the landfill leachate using the highly selectivecoculturing-technique in a BF and...