Water Company Europoort started a pilot plant (MP)ultraviolet (UV) study to determine the UV-
fluence to meet the Dutch drinking water standards. The results of large volume
sampling demonstrated that environmental spores of sulphite-reducing clostridia
(SSRC), were highly resistant against UV. With the pilot plant at a flow of 180 m3/h a
challenge test was conducted to compare the susceptibility of environmental SSRC
and lab-cultured spores of C. perfringens, MS2 bacteriophages and Bacillus subtilis.
The latter was dosed as a biodosimeter with a calibrated UV253.7nm sensitivity to
confirm the biocidal fluence. This test demonstrated that environmental SSRC were
a factor of 1.6 more resistant against UV than the lab-cultured spores of C. perfringens. Furthermore, comparing the inactivation of these environmental SSRC
indicated that they are more resistant to UV than other relevant micro-organisms for
drinking water safety. Combining large volume sampling for SSRC and biodosimetry
yielded an instrument for on-site verification of the efficacy of the UV-system.
Further research is necessary to determine if this relation is consistent in this and
other waters and the cause of the increased resistance of environmental micro-
organisms. Includes 12 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 180 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 8 |
| Published : | 09/22/2002 |
