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: 10878

#Part-B Specialized Branches in Biotechnology

The resistance of the pulmonary tree is so low that a 1 cm of water pressure gradient is sufficient to cause normal air flow during resting conditions. Which of the following often has a substantial resistance during pulmonary disease states that can limit alveolar ventilation?

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#Question id: 14793

#Part-B Specialized Branches in Biotechnology

Batch steriisation includes 

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#Question id: 431

#Part-B Specialized Branches in Biotechnology

Which is not generally a molecule used to conserve energy?

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#Question id: 2277

#Part-A Aptitude & General Biotechnology

A gram-positive bacterium is stained _______________ by the gram stain

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#Question id: 5373

#Part-A Aptitude & General Biotechnology

The average of first 10 natural number is :