An effluent at a flow rate of 2760 m3/day from a sewage treatment plant is to be disinfected when a chlorine dose of 15 mg/ℓ is used following the disinfection model of Nt = N0 e-0.15 t
where, Nt = No. of microorganisms surviving at any time ‘t’ (in min)
N0 initial No. of microorganisms present.
If the volume of the tank is 50 m3, the % removal of microorganisms in the tank
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