AWWA WQTC58877

In order to manage microbial risk in a water supply, it is important to determine thephysical removal performance of the water treatment process. In this study, results fromthree separate research projects were assembled to determine the overall fate of microbialpathogens entering a conventional water treatment plant. In order to quantify thephysical log-removals of each unit process, a number of spiking trials were carried out atboth pilot and full-scale over a two-year period. Particles used in spiking trials includedCryptosporidium parvum oocysts (formalin inactivated), Total Coliform and E.Colibacteria (native in raw water), B.subtilus, and polystyrene microspheres.Under normal treatment conditions, microbial removals were found to be 6.4-log forCryptosporidium and other similar particles, whereas removal performance decreased to3.5-log during impaired coagulation conditions. Waste sludge experiments were alsoconducted to determine the fractionation of C.parvum oocysts between the solids andsupernatant phases of sedimentation sludge and filter backwash waste. During the courseof the study, several new techniques were developed that can be used to determinetreatment plant performance for physical removal of microbial pathogens. Includes 5 references, tables.

Product Details

Edition:

Vol. - No.

Published:

11/02/2003

Number of Pages:

11

File Size:

1 file , 280 KB