Treatment Plant Operator Exam Study Guide Answers

At what stage is wasting accomplished when operating a Sequencing Batch Reactor (SBR)? The answer to this question is D, during the idle stage. Typical SBRs 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 prior to starting a new sequence. During this stage, a small amount of the MLSS or activated sludge will be pumped out as necessary. Most SBRs are computer operated, using sensors and timers to operate. What is the maximum chlorine gas withdraw rate from a 150-pound cylinder? The correct answer is