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Unformatted text preview: = > = - - Ppositive Pk 0 1 e . For test tubes 5 and 6, the results are negative; = = = - Pnegative Pk 0 e . Therefore, Ptotal = . P1P2P3P4P5P6P7 We graph Ptotal vs. concentrations and get the following chart. From the chart, we can tell that MPN is 0.2 cells / mL, which is 20 cells / 100mL. Comparing this to the undisinfected water bacterial concentration 106 cells / L, which is 105 cells / 100mL, the disinfection efficiency is N/N0 = 0.0002 = 2 -10 4 , which is 4-log removal....
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This note was uploaded on 02/09/2010 for the course ENGIN 10 taught by Professor Johnson during the Fall '08 term at University of California, Berkeley.
- Fall '08