A groundwater treatment plant adds chlorine to oxidize iron and manganese for removal by filtration. The groundwater temperature during peak summer usage is 10°C and the pH is 7.8. Based on a tracer study, the t10 time from chlorine addition in the contact tank through filtration is 1.8 min. The t10 time in the clear well during peak pumpage is 8.0 min. The chlorine residual in the filter effluent is 0.8 mg/l and in the clear-well effluent is 0.4 mg/l. Is the disinfection adequate for 3.0-log inactivation of viruses?
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