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1. |
An effluent of a flow rate of 2670 m3/day from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/litre yield the model Nt = No e(-0.145t) where Nt = Number of organisms remained at any time t (in 'min')and No = Number of initial organisms at time t = 0. The volume of disinfection unit (in m3) required to achieve a 98 % kill of micro-organisms is ______________ |
A. | 35 |
B. | 50 |
C. | 45 |
D. | 85 |
Answer» C. 45 | |