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?

________________________

#Question id: 651

#Section 2: General Biology

Consider an enzyme catalysed reaction treated with inhibitor. Enzyme kinetic was analysed with Eadie Hofstee equation. A plot of V0 versus V0/[S] for an enzyme-catalyzed reaction is shown below. The control curve was obtained in the absence of inhibitor. Which effect is shown on the enzyme activity when an inhibitor is added to the reaction mixture?

#Question id: 653

#Section 2: General Biology

For the enzyme-catalyzed reaction S ~ P, Keq = 5, which of the following curves best represents the change in [S] that occurs with time when S is added to a solution containing the appropriate enzyme?

#Question id: 753

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

The renaturation of regions of complementarity between different nucleic acid strands is known as___________

#Question id: 992

#Section 1: Engineering Mathematics

Fatty acids are activated to acyl-CoAs and the acyl group is further transferred to carnitine because:

#Question id: 1080

#Section 3: Genetics, Cellular and Molecular Biology

 In the formation of biofilms, such as those forming on unbrushed teeth, cell signaling serves which function?

#Question id: 1081

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following is a type of local signaling in which a cell secretes a signal molecule that affects neighboring cells?