Bio tank/oxygen replenishment system

A bio-tank oxygen replenishment system, comprising:

• a cyclonic mixer for mixing wastewater with gaseous oxygen, wherein the mixer includes a hydro-cyclone head inlet, a wastewater inlet and a gas inlet, an accelerator head for spinning the wastewater into a vortex in a down tube, the vortex including a central evacuated area, a probe for measuring oxygen concentration of the wastewater in the tank, an oxygenated head space, a sensor for measuring the size of the head space, a port for changing the size of the head space in response to input from the sensor, and a baffle for diverting oxygenated wastewater from a down tube outlet, to the head space;
• a bioreactor tank for processing the wastewater mixed with oxygen;
• a probe for measuring oxygen concentration of the wastewater in the bioreactor tank;
• a circulation pump for transferring wastewater from the bioreactor tank to the mixer;
• and
• a controller for regulating the oxygen replenishment rate of the wastewater, wherein the controller sets the circulation pump speed based on real-time oxygen concentration information provided by the probe.