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: 16868

#General Aptitude

He confided_____ me.

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#Question id: 16869

#General Aptitude

Hardly had he left ………. his brother came.

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#Question id: 16870

#General Aptitude

I would rather have a copy ………a book.

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#Question id: 16871

#General Aptitude

He is no other ……… my friend.

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#Question id: 16872

#General Aptitude

He saw a snake ………he awoke.

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#Question id: 16873

#General Aptitude

Ten years have passed ……… my grandmother died.