Control of nitratation in an oxygen-limited autotrophic nitrification/denitrification rotating biological contactor through disc immersion level variation.

Highlights: [•] Nitratation in an OLAND RBC could be controlled through the immersion level. [•] 85–89% of the O2 input was directly absorbed during the air exposure of the discs. [•] Process control strategies solely based on DO level did not seem to be effective. [ABSTRACT FROM AUTHOR]