Patent ID: 7156998
Filing Date: 2007-01-02
Classification: C02F,Y02W,Y10S

Abstract:
1. A continuous flow, activated sludge wastewater treatment process carried out in a wastewater treatment facility having an anaerobic vessel, a reactor vessel and a separator, said reactor vessel in communication with aeration equipment, said process comprising the steps of: combining in said anaerobic vessel a wastewater and thickened solids, said thickened solids obtained from said separator; operating said anaerobic vessel under anaerobic conditions and promoting the subsequent removal of biological nutrients from said wastewater before said wastewater is conveyed to said reactor vessel; receiving in said reactor vessel the wastewater discharged from said anaerobic vessel and a supernatant discharged from said separator; operating said reactor vessel in alternating aerated and anoxic phases; wherein the effluent from said reactor vessel following solid/liquid separation has a total nitrogen concentration less than or equal to 3.0 mg/l.