Waste treatment systems

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 soluble gases;
• 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, to stabilize biosolids such that they meet Federal 503 part (a) regulations for the land application of biosolids, to mineralize nitrogen compounds, and/or to reduce the total volume of sludge and/or septage by 90-95%;
• 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.