METHOD AND SYSTEM FOR OZONE VENT GAS REUSE IN WASTEWATER TREATMENT

摘要

A system and method for ozone vent gas reuse is provided. The disclosed system and method involve controlling or conditioning the ozone vent gas stream or degassing unit vent gas stream and directing the stream to a mechanically agitating contactor in an aerobic section of the wastewater treatment system. The oxygen content of the vent gas stream is controlled so as to ensure sufficient oxygenation to the aerobic section of the wastewater treatment system. Control may be effected by adjusting the oxygen content of the vent gas stream in response to sensor or measurement inputs characterizing the gas contents of the vent gas stream or the dissolved oxygen level in the aerobic section of the wastewater treatment plant. Adjusting the oxygen content of the vent gas stream may be accomplished by: adjusting the flow of the oxygen containing feed stream to the ozone generator; adjusting the power supplied to the ozone generator; or adjusting the flow of a make-up oxygen containing stream to the vent gas stream. The volumetric flow of the vent gas stream to the aerobic section may also be controlled by adjusting the rotational speed of the mechanically agitating contactor in an aerobic section of the wastewater treatment system.