International Conference on Rain Water Cistern Systems
Manila , Philipines
- August, 1989
Valuation Of Rainwater
Quality: Heavy Metals And Pathogens
Wirojanagud Pinthita Mungarndee band Patcharee Hovicitr
Khon Kaen University, Thailand
Stored rainwater will be a potentially safe and economic drinking water supply
if it is free from any contaminants. This study proposed to determine the bacteriological
and chemical quality of stored rainwater. The rainwater samples were collected
from collection systems, outdoor and in-house storage containers. Information
on sanitary practices which appeared to affect the quality of stored rainwater
was also investigated.
The study have shown that all of those sampling points were bacteriologically
contaminated. Pathogenic contamination was found in a few samples collected from
those sampling points. The pathogens identified were Salmonella gr. B and gr.
C, Aromonas sp., and Vibrio parahaemolyticus. It was also found that the unhygienic
sanitary practices of the villagers were a major factor in bacteriological contamination.
The heavy metals analysed in this study were Cd, Cr, Pb, Cu, Fe, Mn, and Zn. Most
of the heavy metal concentrations compared favourably with the WHO drinking water
standard with two exceptions, Mn and Zn. These two heavy metals are considered
to affect the aesthetic quality only, and therefore are not significant to health.
The findings from this study indicate that only health risks evolving from
the consumption of stored. rainwater would be due to bacteriological contamination
rather than from heavy metal contamination.
PDF of full document (20pp, 320kb)
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