The BOD5 value of a waste-water feed stream to an activated-sludge unit is S0 = 300 mg/l, and the effluent is desired to be S = 30 mg/l. The feed flow rate is F = 2× 10^7 l/day. For the recycle ratio of α = 0.5 and a steady-state biomass concentration of X = 5 g/l, Use the following kinetic parameters:

 

calculate Hydraulic residence time

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#Question id: 1358

#Section 3: Genetics, Cellular and Molecular Biology

In going from the apical to the basal end of an epithelial cell, in what order do the various cell surface junctions appear?

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#Question id: 3767

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following characteristics would you expect of a eukaryotic organism that lacks the enzyme telomerase?

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#Question id: 14562

#Section 2: General Biology

Which of the following stains is/are considered differential?

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#Question id: 19908

#Section 5: Bioprocess Engineering and Process Biotechnology

The continuous cultures are not widely used in industry because

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#Question id: 21268

#Section 5: Bioprocess Engineering and Process Biotechnology

The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.