An activated sludge tank treats 1 MGD from the primary clarify and has an X of 2200
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Question:
2200 ppm SS. The water effluent is 0.9 MGD. 1.0 MGD of the sludge is recycled back into the tank
and has an [SS] of 3980 ppm. The concentration of the BOD exiting the primary clarifier is 200
ppm.
(a) What are Qw and Xw?
(b) What are Qc and Xc?
(c) What are Q1 and X1?
(d) What is Xe? (Answer = 24.4 ppm)
(e) Calculate the volume of the tank that will satisfy the following requirements:
(e-1) BOD loading < 35 lb BOD/1000 ft3day
(e-2) Sludge age > 5 days
(e-3) Aeration period > 4 hr
Related Book For
Understanding Business Ethics
ISBN: 9781506303239
3rd Edition
Authors: Peter A. Stanwick, Sarah D. Stanwick
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