Ultraviolet (UV) light technology is gaining ground
as an effective and inexpensive disinfectant for
control of Cryptosporidium in drinking water.
Previous researchers examining the effects of UV have
focused only on UV inactivation of Iowa strain oocysts.
However, to accurately assess the technology's efficacy
and applicability to drinking water treatment, more
information was needed on the UV dose-response of
other Cryptosporidium strains infectious to humans.
This study investigated the effect of UV doses ranging
from 5 to 40 mJ/cm<sup>2</sup> on five strains of C. parvum -
Iowa, Moredun, Texas A&M University, Maine,
and Glasgow. Results indicated that all five strains
of C. parvum were highly susceptible to low levels
of UV light. A UV light dose as low as 10 mJ/cm<sup>2</sup>
achieved at least 4-log<sub>10</sub> inactivation for all strains
evaluated, and most strains were susceptible at even
lower UV doses, e.g., 2-5 mJ/cm<sup>2</sup>.
With the promulgation of new regulations by the
US Environmental Protection Agency, UV is moving
ahead as a best available technology for controlling
Cryptosporidium oocysts in drinking water supplies.
The results of this study give utility managers a greater
understanding of and increased confidence in UV
treatment for inactivation of a variety of
Cryptosporidium strains. Includes 64 references, tables, figures.
| Edition : | Vol. 96 - No. 3 |
| File Size : | 1
file
, 4.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 03/01/2004 |
