Effectiveness of Storage as a Point-of-Use Means of Improving the Bacteriological Quality of Drinking Water
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Date
2013-02
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International Formulae Group
Abstract
The evaluation of the effectiveness of storage as a point-of-use means for improving the bacteriological
quality of drinking water was carried out using a completely randomized block design. Total plate and total
coliform counts were enumerated for day 0 -10 samples using Nutrient Agar (NA) and multiple tube techniques
respectively. Physicochemical analyses of water samples were carried out using standard procedures including
titrimetric methods. Ten bacteria species including Escherichia coli, Bacillus cereus, Citrobacter freundil,
Salmonella typhymurium, Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae, Arizona
spp., Proteus vulgaris, Enterobacter aerogenes were isolated from water samples obtained from borehole, well
and sachet water samples in the study area. For day zero samples, it was found that the total bacteria counts
ranged from 1.01x102 to 4.38 x102 CFU/mL for borehole, 0.57x102 to 2.13x102 CFU/mL for well and 0.54x102
to 0.92x102 CFU/mL for sachet water. A significant reduction in bacteria load was recorded for all samples
from day 2 to day 7 when the water samples were monitored over a period of ten days. The results reveal that
water storage for 2-7 days is a viable point-of-use method of household level drinking water disinfection.
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Keywords
Coliforms, Water storage