What is Qe ?
Water flows out of the primary clarifier with a SS = 200 ppm and a BOD = 250 ppm. An activated sludge tank treats 5 MGD from the primary clarifier and has an [SS], or X of 2500 ppm. The water effluent is 95% of the influent and 50% of the sludge is recycled back into the activated sludge tank with an [SS] of 6800 ppm.
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