AWWA WQTC69238

This powerpoint presentation begins by providing a brief overview of the criticality of disinfection, the use of chlorine and monochloramine as disinfectants, U.S. Environmental Protection Agency (USEPA) disinfection requirements, and the USEPA Contaminant Candidate List 2 (CCL2) viruses for potential regulation. A brief overview is provided of previous research in ReagentGrade Water (RGW) and natural waters on chlorine, monochlorine, multiple viruses. AwwaRF Project 3134 study objectives are presented and include the following: relative resistance of study viruses;effect of pH;effect of temperature;effect of disinfectant concentration;effect of water quality; and,free chlorine vs. monochloramine. Experimental methods are presented, including: specific viruses used; baseline experimental conditions; treated source water (TSW) experimental conditions; experiments conducted in recirculating water bath(d 5 hr) or in environmental chamber (e 5 hr);inactivation data obtained using tissue culture plaqueassays;inactivation curves plotted using EFH model in Excel; and,viral inactivation measured by calculating Ct value(conc. x time) for 2, 3, and 4 log reduction. Presentation conclusions indicate the following: pH and temperature trends followed previousdisinfection kinetic theory;in general, increased disinfectant concentration didnot always result in a proportional increase indisinfection rate;disinfection was most effective for MNV;chlorine disinfection was least effective for CVB5;monochloramine disinfection was least effective forAdV2 and E11; and,disinfection for some viruses was markedly differentbetween different water types. Thus, it is important toconsider virus susceptibility for a range of naturalwater types when evaluating the potential efficacy ofdisinfectants. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

26

File Size:

1 file , 940 KB