Patent ID: 11858837
Assignee: EVOQUA WATER TECHNOLOGIES LLC
Field: Environmental technology (Chemistry)
Classification: CPC C  G  Y | IPC C  G

Claim 0:
1. A wastewater treatment system comprising:
a sequencing batch reactor vessel configured to perform biological treatment of wastewater in a series of treatment stages including a fill stage, a biological reaction stage, a sludge settling stage in which solids settle from the wastewater to form a sludge and a solids-lean supernatant, a solids-lean supernatant decant stage, and an idle stage, the fill stage including introducing a non-predetermined amount of wastewater into the vessel;
a liquid level sensor configured to measure a level of liquid in the vessel and provide an indication of the level of the liquid to a controller; and
a sludge detector configured to measure a position of an interface between the sludge and the solids-lean supernatant in the vessel and to provide an indication of the position of the interface to the controller, the controller configured to perform a comparison between the level of the liquid and the position of the interface and control an amount of solids-lean supernatant removed from the vessel during the decant stage based on the comparison.