Authors: Simonne Rufener, Daniel Mäusezahl, Hans-Joachim Mosler, Rolf Weingartner
1Group of Hydrology, Geographical Institute, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland,2Department of Public Health and Epidemiology, Swiss Tropical Institute, Socinstrasse 57, PO Box, CH-4002 Basel, Switzerland,3Swiss Federal Institute of Aquatic Sciences and Technology, EAWAG, Überlandstrasse 133, PO Box 611, 8600 Dübendorf, Switzerland
ABSTRACT
In-house contamination of drinking-water is a persistent problem in developing countries. This study aimed at identifying critical points of contamination and determining the extent of recontamination after water treatment. In total, 81 households were visited, and 347 water samples from their current sources of water, transport vessels, treated water, and drinking vessels were analyzed. The quality of water was assessed using Escherichia coli as an indicator for faecal contamination. The concentration of E. coli increased significantly from the water source [median=0 colony-forming unit (CFU)/100 mL, interquartile range (IQR: 0-13)] to the drinking cup (median=8 CFU/100 mL; IQR: 0-550; n=81, z=-3.7, p<0.001). About two-thirds (34/52) of drinking vessels were contaminated with E. coli. Although boiling and solar disinfection of water (SODIS) improved the quality of drinking-water (median=0 CFU/100 mL; IQR: 0-0.05), recontamination at the point-of-consumption significantly reduced the quality of water in the cups (median=8, IQR: 0-500; n=45, z=-2.4, p=0.015). Home-based interventions in disinfection of water may not guarantee health benefits without complementary hygiene education due to the risk of posttreatment contamination.
Key words: Disinfection; Drinking-water; Hygiene; Water management; Water pollution; Water supply; Bolivia
View content: Click here... Size: 581KB
Browse by year: 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000
