Patent ID: 7833410

Claim:
A bio-tank gas replenishment system, comprising: a cyclonic two stage mixer for mixing wastewater with a selected gas, wherein the mixer includes a head including a gassification head space, an outer housing having a wastewater inlet in fluid communication with a plenum defined by a space between the outer housing and an inner cartridge, the inner cartridge having a plurality of ports which are selectively opened and closed to permit wastewater flow therethrough and into a down tube; a sensor for measuring the size of the head space; a bioreactor tank for processing the wastewater mixed with the selected gas; a probe for measuring gas concentration of the wastewater in the bioreactor tank; a controller responsive to the probe measurements, wherein the controller regulates mixer pressure in the mixer comprising controlling opening and closing of the ports, thereby regulating the gas concentration of the wastewater in the bioreactor tank; and a circulation pump for transferring wastewater from the bioreactor tank to the mixer, wherein the controller sets the circulation pump speed to optimize the wastewater gas concentration.