Comparison of the microbiological and chemical characterization of harvested rainwater and reservoir water as alternative water resources
- Comparison of the microbiological and chemical characterization of harvested rainwater and reservoir water as alternative water resources
- 이주영; 양중석; 한무영; 최재영
- Rainwater harvesting (RWH); Statistical analysis; Chemical parameters; Microbiological parameters
- Issue Date
- The Science of the total environment
- VOL 408, NO 4, 896-905
- Rainwater harvesting (RWH) offers considerable potential as an alternative water supply. In this study, all of the
harvested rainwater samples met the requirements for grey water but not for drinking water. In terms of
microbiological parameters, total coliform (TC) and Escherichia coli (EC) were measured in 91.6% and 72%,
respectively, of harvested rainwater samples at levels exceeding the guidelines for drinking water, consistent
with rainfall events. In the case of the reservoir water samples, TC and EC were detected in 94.4% and 85.2%,
respectively, of the samples at levels exceeding the guidelines for drinking water. Both indicators gradually
increased in summer and fall. The highest median values of both TC and EC were detected during the fall.
Chemicalparameters such as common anions andmajor cations aswell asmetal ions in harvested rainwaterwere
within the acceptable ranges for drinkingwater. By contrast, Al shows a notable increase to over 200 μg L−1 in the
spring due to the intense periodic dust storms that can pass over the Gobi Desert in northern China. In terms of
statistical analysis, the harvested rainwater quality showed that TC and EC exhibit high positive correlations with
NO3− (ρTC=0.786 and ρEC=0.42) and PO4− (ρTC=0.646 and ρEC=0.653), which originally derive from
catchment contamination, but strong negative correlations with Cl− (ρTC=−0.688 and ρEC=−0.484) and Na+
(ρTC=−0.469 and ρEC=−0.418), which originate from seawater.
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