Patent ID: 8821727

Claim:
A wastewater treatment system comprising: one or more aeration tanks for receiving wastewater; a controller for controlling the amount of air delivered to each of the one or more aeration tanks by a blower assembly; and a sensor assembly for periodically measuring values corresponding to the amount of dissolved oxygen in at least one of the one or more aeration tanks, wherein: when the sensor assembly measures values that are less than a low setpoint value, the controller causes the blower assembly to incrementally deliver more air until the sensor assembly measures values that are not less than the low setpoint value; when the sensor assembly measures values that exceed the low setpoint value, the controller causes the blower assembly to incrementally deliver less air until either the sensor assembly measures values that are not greater than the low setpoint value, or the blower assembly reaches a preselected low operating threshold; and when the blower assembly is operating at the preselected low operating threshold, and the sensor assembly measures values that exceed a high setpoint value for a first designated period of time, the controller causes the blower assembly to shut down for a second designated period of time.