Characterization of rainwater from rainwater harvesting in relation to its usage for human consumption
Abstract
The practice of rainwater harvesting is such providing both potable and non-potable
supply of water, and it was applied then to meet the higher demand of world population
nowadays, moreover among the communities in rural areas. The issue with rainwater
harvesting is a potential source of nonpoint pollution due to the reason of leaching
process from roof. On determination of rainwater quality, roof type is an important
factor that needs to be considered. The analysis of rainwater quality was investigated for the physicochemical tests at increment of each 5 minutes interval in about 25 minutes.
The parameters on physicochemical tests involved are pH measurement, turbidity, total
suspended solids (TSS), total hardness, and presence of heavy metals. The pH
measurement shown to be consistent, but some of rain event shows the pattern of
inconsistent value towards the increasing of 5 minutes interval. The turbidity were
decreased towards the time increment. Total hardness was found to be the highest at the
range of 5 to 10 minutes. Test on presence of heavy metal proved on the presence of
Ferum (Fe) and Calcium (Ca) in the rainwater samples collected from asbestos-cement
roof type. The optimum ‘first-flush’ period duration was determined as for first 10
minutes of rain event.
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