The village of Match Box is using a slow sand filter followed by chlorination. The filter effluent has a turbidity in the range 0.4 to 0.6 NTU. Chlorine is added to a 265 m3 clearwell. The 100 mm diameter pipeline to the first customer is 500 m long. The residual chlorine concentrations in the clearwell and the pipeline are 1.6 and 1.0 mg/L, respectively. The clearwell is considered to have a very poor performance rating because it lacks baffling. The pipeline is considered to have a nearly perfect performance rating. Determine the Giardia log-inactivation at a temperature of 10oC and a pH of 7.5. The peak flow rate is 0.38 m3/min (adapted from Lin, 2001).
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