AWWA ACE56203

Granular media filtration is a critical process for removing pathogens during drinking water treatment. Removal of the protozoan pathogens Cryptosporidium parvum and Giardia lamblia by granular media filtration has been of paramount interest due to the limitations of disinfection processes other than UV irradiation and ozone. Most studies that have examined the removal of these and other pathogens by filtration have been conducted during optimized filtration and pre-treatment conditions. The present work summarizes studies that have investigated protozoan pathogen removal by filtration during various points in the filter cycle and during non-optimal operating conditions. C. parvum removal by granular media filtration can vary tremendously during different periods of the filter cycle andsub-optimal performance events that can occur during typical water treatment conditions. These differences can be site- and source-water specific, making it difficult to extrapolate data from one study to another. A particularly important finding is that, in some cases, poor C. parvum removal is observed when otherwise excellent filtered water quality of <0.1 NTU is achieved. Includes 27 references, figure.

Product Details

Edition:

Vol. - No.

Published:

06/16/2002

Number of Pages:

10

File Size:

1 file , 300 KB