Engineering, 19.11.2019 01:31 kitkat033157

An activated sludge tank treats 1 mgd from the primary clarifier and has an x or 2,200 ppm ss. the water effluent is 0.9 mgd. 1.0 mgd of the sludge is recycled back into the tank and has a [ss] of 3,980 ppm. the concentration of bod exiting the primary clarifier is 200 ppm.
(a) find qw and xw.
(b) find qc and xc.
(c) find q1 and x1.
(d) find xe.
(e) calculate the volume of the tank that will satisfy the following requirements: a. bod loading < 35 lb bod/1000 ft3 day b. sludge age > 5 days c. aeration period > 4hr

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An activated sludge tank treats 1 mgd from the primary clarifier and has an x or 2,200 ppm ss. the w...