WASTEWATER
By Rick LallishHow is wasting accomplished when operating a sequencing batch reactor?A. Immediately after the react stageB. During the react stage (about halfway through the stage)C. During the decant stageD. During the idle stageAnswer: D. Typical sequencing batch reactors are single-tank wastewater treatment systems that operate in a five-stage process (fill-react-settle-decant-idle). When operating properly, the wasting is done during the idle stage before starting a new sequence. During this stage a small amount of the MLSS or activated sludge is pumped out as necessary. Most SBRs are computer-operated, using sensors and timers. More information may be found in the WEF textbook: Wastewater Treatment Fundamentals
