[Start-up and affecting factors of biofilter for treatment of NO(x) under aerobic conditions].

An optimized aerobic denitrifying bacteria was applied to a biofilter for the removal of NO(x). The removal process of NO(x) was investigated, and the relationship between environmental factors and NO(x) removal efficiency as well as the NO(x) transfermechanism under aerobic conditions are discussed. The results show that the biofilter finished start-up after 26 days and the presence of oxygen has no evident negative effect on the efficiency of NO(x) removal. Mainly happening at the middle and under part of the biofiltration system, the removal of NO(x) get a high efficiency of 93.6% at the EBRT of 59s and the inlet NO(x) concentration of 286.4 mg/m3 with 10% O2. A special biomembrane system was formulated by nitrobacteria, facultative denitrifying bacteria and aerobic denitrifying bacteria in the biofiltration system.