GATE CE 2025 Set 1 — Question 21

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MCQ+1 / -0.33EasyDrinking Water TreatmentEnvironmental EngineeringMPN Test & ColiformsWater Quality

Environmental Engineering → Drinking Water Treatment → MPN Test & Coliforms

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Fecal Coliform (FC) concentration in river water was measured as 10780 cfu/100 ml10780 \text{ cfu/100 ml}. The FC concentration after the conventional water treatment, but before chlorination, was measured as 23 cfu/100 ml23 \text{ cfu/100 ml}. The ‘Log Kill’ (inactivation) of FC due to the conventional water treatment is closest to
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