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 ______________

An effluent of a flow rate of 2670 m3/day from a sewage treatment plan

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

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