Patent ID: 7651608

Claim:
In an aerobic wastewater treatment system comprising an aerobic digestion tank, said aerobic digestion tank defining an aeration chamber and a clarifier chamber, and a pump for introducing an oxygen-containing gas into treated wastewater in said aeration chamber, the improvement comprising: a feedline operatively connected to said pump for introducing said oxygen-containing gas into said treated wastewater and said aeration chamber; a by-pass circuit, said by-pass circuit having an inlet and an outlet, said outlet being connected to said feedline, said inlet being connected to said pump, said by-pass circuit including a first branch line and a second branch line, said first and second branch lines being in open communication with said pump and said feedline; a solenoid valve disposed in said first branch line; a flow restrictor disposed in said second branch line; a timer/controller connected to said solenoid valve and being operative to open and close said solenoid valve for predetermined periods of time whereby when said solenoid valve is closed, flow from said pump passes through said second branch line and said flow restrictor, said pump running continuously during periods when said solenoid valve is open and when said solenoid valve is closed.