BioCycle-ENR adjusts the FlexZone volume to match the anoxic, low DO, or aerobic needs to meet treatment objectives. BioMix Compressed Gas Mixing is integrated with diffused aeration in the FlexZone system to allow for concurrent operation, as needed, during mixing limited conditions. Through online process instrument feedback, the master control panel automatically adjusts operating parameters to optimize biological phosphorus removal, nitrification and denitrification, alkalinity recovery, and energy savings.