Example problem: Following filtration, water in serpentine chlorination basin is dosed with 6 mg/L of free...

 

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Example problem: Following filtration, water in serpentine chlorination basin is dosed with 6 mg/L of free chlorine at Cl. Tracer tests show the following characteristic hydraulic residence times for the basin, piping, and storage tank. Once in the storage tank, free chlorine is converted to monochloramine to increase stability of the residual disinfectant. Estimate the expected removal of Giardia Lamblia cysts in water coming out of the tap from the first customer. Water has pH 9.0 and 10 C. Use Table 11.8 in your handouts. 6 mg/L Free chlorine converted to monochloramine in storage tank tR = 30 min 1 mg/L tR = 240 min t10 = 60 min 2 mg/L t10 = 2000 min 0.5 mg/L 0.25 mg/L Example problem: Following filtration, water in serpentine chlorination basin is dosed with 6 mg/L of free chlorine at Cl. Tracer tests show the following characteristic hydraulic residence times for the basin, piping, and storage tank. Once in the storage tank, free chlorine is converted to monochloramine to increase stability of the residual disinfectant. Estimate the expected removal of Giardia Lamblia cysts in water coming out of the tap from the first customer. Water has pH 9.0 and 10 C. Use Table 11.8 in your handouts. 6 mg/L Free chlorine converted to monochloramine in storage tank tR = 30 min 1 mg/L tR = 240 min t10 = 60 min 2 mg/L t10 = 2000 min 0.5 mg/L 0.25 mg/L