Patent ID: 8496808

Claim:
A wastewater treatment apparatus ( 10 ), comprising: a primary treatment tank ( 12 ); and a polishing treatment tank ( 14 ), wherein wastewater is transferred sequentially from the primary treatment tank ( 12 ) to the polishing tank ( 14 ), and wherein each treatment tank ( 12 , 14 ) has a separate associated treatment circuit ( 18 ) including: a gas and liquid mixing chamber ( 20 ) housed in a different vessel than the primary treatment tank or the polishing tank; an inflow conduit from the primary treatment tank or the polishing tank to the mixing chamber; a gas injector ( 22 ) on the inflow conduit upstream of the mixing chamber ( 20 ) and at least one of a source of oxygen ( 24 ) or a source of ozone ( 26 ) supplying gas to the gas injector ( 22 ); a return conduit from the mixing chamber back to the primary treatment tank or the polishing tank; and a pump ( 28 , 29 ) for pressurizing the treatment circuit and pumping wastewater from the treatment tank ( 12 , 14 ) along the inflow conduit, through the mixing chamber ( 20 ), along the return conduit and back to the primary treatment tank or polishing tank ( 12 , 14 ).