During the deep cycle, mixing is suspended for prolonged periods of time allowing for solids to accumulate, enhancing fermentation and VFA production. During the mixing cycle, intermittent mixing of tank contents is provided by bursts of compressed air fired through patented, engineered nozzles located at the floor of the tank. The cycle parameters may be adjusted to optimize mixing, power utilization, and VFA generation, manually or through automated process feedback. The operating regime of BioMix-DC is site dependent since each biological phosphorus removal treatment process operates differently based on the influent characteristics and facility design.