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 treatme nt basin is 50,000 l. What value of the recycle ratio must be used?

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#Question id: 1838

#Section 2: General Biology

What is the single most commonly used term to describe the exchange of genetic material between viruses that infect different species?

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#Question id: 16016

#Section 6: Plant, Animal and Microbial Biotechnology

Range of optimum glutamine concentration present in the culture media is

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#Question id: 3315

#Section 3: Genetics, Cellular and Molecular Biology

Which one of the following statements is TRUE for Negative-frequency dependent selection?

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#Question id: 4345

#Section 3: Genetics, Cellular and Molecular Biology

For a repressible operon to be transcribed, which of the following conditions must occur?

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#Question id: 11859

#General Aptitude

Six bells commence tolling together and toll at intervals of 2,4,6,8,10,and 12 seconds respectively . In 30 minutes , how many times do they toll together ?