ENVIORMENTAL ENGINEERING Using the attached table, determine the CT value to decrease the concentration of Giardia...

ENVIORMENTAL ENGINEERING

Using the attached table, determine the CT value to decrease the concentration of Giardia from approximetly 3,160 to 10 cysts/L, using a chlorine concentration =1.2mg/L at pH=7.5 , 15 degC

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Expert Solution

Log reduction is the same as counting the zeroes in a division of 10, 100, 1000, 10000 times:

If we can reduce to the desired value dividing by 10, then we're talking about a 1-log reduction.

If we can reduce to the desired value dividing by 100, then we're talking about a 2-log reduction.

In this case, dividing by 1000 gives us 3.16 which is still bigger than 1. We would need to divide by 10000 to get a value smaller than required (0.316 is smaller than 1). So the required log reduction is between 3 and 4. The exact value can be found simply using a calculator:

So, as I notice your chart is in 0.5 increments, the required log reduction value would be 3.5

queen_honey_blossom answered 1 year ago

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