An activated-sludge waste treatment system is required to reduce the amount of BOD₅ from 1000 mg/l to 20 mg/l at the exit. The sedimentation unit concentrates biomass by a factor of 3. Kinetic parameters are µ_m = 0.2 h-1 , K_s = 80 mg/l, k_d = 0.01 h-1 , and Y ^M _X/S = 0.5 g MLVSS/g BOD₅. The flow of waste water is 10000 l/h and the size of the treatment basin is 50,000 l. What is the value of the solids residence time?

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#Question id: 1881

#Section 2: General Biology

Lol p 1-11 are allergens cloned from:

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#Question id: 14691

#Section 1: Engineering Mathematics

In a shooting competition, the probability of hitting the target by A is 2/5, by B is 2/3 and by C is 3/5. If all of them fire independently at the same target, calculate the probability that only one of them will hit the target.

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#Question id: 1643

#Section 2: General Biology

What is the single best defining description of the classical pathway of complement activation?

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#Question id: 15463

#Section 4: Fundamentals of Biological Engineering

A system in which there is exchange of energy but not of mass, is called a/an    ______                 system

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#Question id: 113

#Section 2: General Biology

Triacylglycerols cannot form lipid bilayers because they