In order to manage microbial risk in a water supply, it is important to determine the
physical removal performance of the water treatment process. In this study, results from
three separate research projects were assembled to determine the overall fate of microbial
pathogens entering a conventional water treatment plant. In order to quantify the
physical log-removals of each unit process, a number of spiking trials were carried out at
both pilot and full-scale over a two-year period. Particles used in spiking trials included
Cryptosporidium parvum oocysts (formalin inactivated), Total Coliform and E.Coli
bacteria (native in raw water), B.subtilus, and polystyrene microspheres.
Under normal treatment conditions, microbial removals were found to be 6.4-log for
Cryptosporidium and other similar particles, whereas removal performance decreased to
3.5-log during impaired coagulation conditions. Waste sludge experiments were also
conducted to determine the fractionation of C.parvum oocysts between the solids and
supernatant phases of sedimentation sludge and filter backwash waste. During the course
of the study, several new techniques were developed that can be used to determine
treatment plant performance for physical removal of microbial pathogens. Includes 5 references, tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 11/02/2003 |
