Patent ID: 8628666

Claim:
A nitrification or anaerobic ammonium oxidation wastewater system comprising: at least one aerobic basin; at least one secondary clarifier in fluid communication with the at least one aerobic basin; at least one inlet port disposed in the secondary clarifier and adapted to selectively recycle nitrifying bacteria or selectively waste heterotrophic bacteria; wherein the inlet port is disposed in the outer half of the secondary clarifier to selectively recycle nitrifying bacteria or disposed in the inner half of the secondary clarifier to selectively waste heterotrophic bacteria; wherein the inner half of the secondary clarifier is defined as the distance equal to or less than about one-half the diameter of a round clarifier and the outer half of the secondary clarifier is defined as the distance equal to or greater than about one-half the diameter of a round clarifier, or wherein the inner half of the secondary clarifier is defined as the distance equal to or less than about one-half the length of a linear clarifier, as measured from a clarifier inlet, and the outer half of the secondary clarifier is defined as the distance equal to or greater than about one-half the length of the clarifier, as measured from the clarifier inlet, wherein the linear clarifier is square or rectangular; a recycle line or a waste line having an input in fluid communication with the at least one inlet port; wherein the output of the recycle line is in fluid communication with the at least one aerobic basin; wherein the output of the waste line is in fluid communication with a waste collector; and a negative pressure system in fluid communication with the at least one inlet port.