Patent ID: 7790032

Claim:
A process of treating domestic sludge and/or septage, the process comprising: introducing domestic sludge and/or septage into a first stage adapted to separate and oxidize a soluble gas; aerating fluid in the first stage; passing effluent from the first stage to a second stage adapted to separate solids from liquid sludge and/or septage; passing effluent from the second stage to a third stage adapted to provide biological oxidation of water soluble carbon and nitrogen compounds; aerating fluid in the third stage; passing effluent from the third stage to a fourth stage adapted to further oxidize carbon and nitrogen compounds; passing effluent from the fourth stage to a fifth stage adapted to receive soluble oxidized nitrogen and carbon compounds and suspended solids from the fourth stage, and to remove the oxidized nitrogen and carbon compounds; passing effluent from the fifth stage to a sixth stage adapted to remove remaining carbon and nitrogen compounds, suspended solids, and pathogenic organisms; and discharging treated wastewater from the sixth stage.