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GATE CE 2014 Set 2 — Question 58

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NAT+2 / -0MediumDisinfectionDrinking Water TreatmentEnvironmental Engineering

Environmental Engineering → Drinking Water Treatment → Disinfection

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Question

An effluent at a flow rate of 2670 m3/d2670\text{ m}^3/\text{d} from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/l15\text{ mg/l} yield the model Nt=Noe−0.145tN_t = N_o e^{-0.145t} where Nt=N_t = number of micro-organisms surviving at time tt (in min.) and No=N_o = number of micro-organisms present initially (at t=0t = 0). The volume of disinfection unit (in m3\text{m}^3) required to achieve a 98% kill of micro-organisms is
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