Physicochemical removal of protozoan pathogens is receiving increased attention because
of the difficulty of chemically inactivating these organisms, particularly Cryptosporidium
parvum. Most research examining the removal of these and other pathogens by filtration has
been conducted under steady-state conditions with optimized pretreatment. This study
evaluated the removal of Cryptosporidium and changes in surrogate
parameters at various points in the filter cycle and under nonoptimal
conditions at two pilot plants with different coagulation regimes.
The study found a reproducible 2-log difference in Cryptosporidium
removals between the two locations under optimal conditions, with
similar low effluent turbidity levels and particle counts. Either
suboptimal coagulation or the early stages of breakthrough at the end of a filter run produced
substantial deterioration of Cryptosporidium removal capability. Filter ripening or the imposition
of a hydraulic step generally had much less effect on removals.
Includes 37 references, tables, figures.
| Edition : | Vol. 94 - No. 6 |
| File Size : | 1
file
, 380 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 15 |
| Published : | 06/01/2002 |
