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?

#Question id: 5381

#Part-A Aptitude & General Biotechnology

A man travels from destination A and B by car to an average speed of 48 km/h and returns on his bike with an average speed of 16 km/h .Find his average speed for the entire journey

#Question id: 5382

#Part-A Aptitude & General Biotechnology

The average of weight of 5 persons is decreased by 2 kg when one of the men whose weight is 50kg is replaced by a new man. The weight of the new man is.

#Question id: 5384

#Part-A Aptitude & General Biotechnology

The average of 100 numbers is 50. It is found that while calculating the average two numbers namely 81 and 66 were wrongly read as 18 and 6 the correct average is.

#Question id: 5386

#Part-A Aptitude & General Biotechnology

The average income of 20 employees in an office is Rs 1800 per month .if one more employee is added the average salary becomes Rs 1810 per month .what is the monthly salary of the new employee?

#Question id: 5387

#Part-A Aptitude & General Biotechnology

The average of three numbers is 52 the first is half of second and the second is twice the third the difference between the second and first number is 

#Question id: 5388

#Part-A Aptitude & General Biotechnology

A batsman has a certain average of runs for 14th innings .He scores 72 runs in the 15th innings thus his average increased by 2 . Find the average after 15th innings.