Chlorine and ozone disinfection of Encephalitozoon intestinalis spores.
Water Res
; 39(11): 2369-75, 2005 Jun.
Article
in En
| MEDLINE
| ID: mdl-15921720
ABSTRACT
Microsporidia are intracellular eukaryotic parasites which have the potential for zoonotic and environmental, including waterborne, transmission. Encephalitozoon intestinalis is a microsporidian pathogen of humans and animals and has been detected in surface water. It is also on the Contaminant Candidate List of potential emerging waterborne pathogens for the US EPA. We performed disinfection studies using chlorine and ozone on E. intestinalis spores with a cell-culture most-probable-number assay to determine infectivity. Chlorine experiments were performed at 5 degrees C at pH of 6, 7, and 8 with 1mg/L initial chlorine concentrations, while ozone experiments were performed at 5 degrees C and pH 7 with initial ozone doses of 1 and 0.5mg/L, both in buffered water. A derivation of Hom's model for disinfection kinetics under dynamic disinfectant concentrations was used to fit observed data and calculate concentration-time product (C*t) values. Chlorine C*t values varied with pH such that 99% (2-log(10)) C*t ranged from 12.8 at pH 6 to 68.8 at pH 8 (mg min/L). Ozone C*t values were approximately an order of magnitude less at 0.59--0.84 mg min/L, depending on initial concentration.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ozone
/
Chlorine
/
Encephalitozoon
/
Spores, Protozoan
/
Disinfectants
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Water Res
Year:
2005
Document type:
Article
Affiliation country:
United States