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: 11872

#Part-A Aptitude & General Biotechnology

The greatest number of four digits which when divided by 3, 5, 7, 9 leave remainders 1, 3, 5, 7 respectively is

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#Question id: 11873

#Part-A Aptitude & General Biotechnology

A, B and C start running at the same time and at the same point in the same direction in a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds. After what time will they meet again at the starting point?

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#Question id: 11874

#Part-A Aptitude & General Biotechnology

The least number which when divided by 16, 18, 20 and 25 leaves 4 as remainder in each case but when divided by 7 leaves no remainder is

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#Question id: 11875

#Part-A Aptitude & General Biotechnology

The least number which when divided by 5, 6, 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder is

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#Question id: 11876

#Part-A Aptitude & General Biotechnology

The smallest perfect square divisible by each of 6, 12 and 18 is 

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#Question id: 11877

#Part-A Aptitude & General Biotechnology

What is the LCM of 1.08, 0.36 and 0.9