The AeroSBR aeration lances allows them to be removed for cleaning while the process is still operating. This overcomes the need to drain the tank or shut the system down. By aerating, settling and decanting in the same reactor it overcomes the need for a separate clarifier, or in the case of Membrane Bioreactors (MBRs), overcomes the need for frequent membrane cleaning/replacement. It provides cycles of aerate, mix, settle and decant. This ensures optimal removal of nitrogen by the nitrification/denitrification process.