4. Calculate the time for 99% (2-log) removal via natural inactivation of Cryptosporidium from water at...
4. Calculate the time for 99% (2-log) removal via natural inactivation of Cryptosporidium from water at a typical winter-time temperature of lakes here in Southern California of 12oC.
Homework Answers
For 2 log removal of Cryptosporidium at 12 degree celcius temperature, lets assume the concentration of chlorine in lake is 1.8 mg/L. So at pH 7 of water,
CT = C x T where C is concentration of disinfectant in mg/L and T is Actual detention time in minutes.
value of CT = 122 and C = 1.8 mg/L
122=1.8 x T
T = 122/1.8
T = 67.7 or 68 min mg/L
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