Mixed liquor wasting system

In an extended aeration wastewater treatment system including a retention basin, a wastewater inlet fluidly connected to said retention basin and a retention basin exit line fluidly connected to said retention basin, said system having wastewater flowing into said retention basin so as to form mixed liquor within said retention basin, said wastewater being treated in said basin and then flowing out of said basin through said retention basin exit line to an external clarifier, a mixed liquor wasting system, comprising:

• a. a thickener tank, having a sidewall and a bottom;
• b. a waste line having a first end and a second end, said first end fluidly connected to said retention basin and said second end fluidly connected to said thickener tank;
• c. a first flow control means for continuously removing a portion of said mixed liquor from said retention basin at a desired constant flow rate through said waste line, fluidly connected to said retention basin exit line;
• d. a sludge removal line having a first end and a second end, said first end fluidly connected to said bottom of said thickener tank, and said second end fluidly connectable to a sludge disposal system;
• e. a second flow control means for removing a concentrated portion of said mixed liquor from said thickener tank, fluidly connected to said thickener tank;
• and
• f. a return line having a first end and a second end, said first end fluidly connected to said thickener tank above said bottom, and said second end fluidly connected to said retention basin;
• and
• g. said first end of said waste line connected to said retention basin exit line.