Abstract
Aerobic nitrification and anoxic denitrification are the two main steps of the biological nitrogen removal processes. However, studies have shown the ability of pure strains to consume simultaneously oxygen and nitrate. These properties of co-respiration were used to combine nitrifiers and aerobic denitrifier ( Microvirgula aerodenitrificans) in a single aerated reactor under continuous and Sequencing Batch Reactor (SBR) cultures. The aerobic denitrifier was maintained by discontinuous addition of carbon. Under these conditions, nitrifying and denitrifying activities were observed with aerobic reduction of the N-oxides produced by autotrophs into nitrous oxide and nitrogen.
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