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- Title
Effect of first-flush device, roofing material, and antecedent dry days on water quality of harvested rainwater.
- Authors
Gikas, Georgios; Tsihrintzis, Vassilios
- Abstract
Two rainwater harvesting systems, which included first-flush diversion devices, connected to the roofs of two adjacent buildings, were monitored for water quality. The roofs were constructed from different materials, i.e., one roof was covered with ceramic tiles and the other was made of concrete. Water quality samples from the two storage tanks and the first-flush devices were collected and analyzed, showing satisfactory water quality in the tanks for residential non-potable use, while the water in the first-flush device was of poorer quality. Between the two collection surfaces, statistically significant differences were found only in the concentrations of NH-N, orthophosphate, and Ca. Total coliforms were detected in both the storage tanks and the first-flush devices, indicating that disinfection of harvested rainwater may be necessary if it is collected for potable uses. Finally, first-flush water quality was related to antecedent dry days, showing that when the number of dry days increased, the accumulation of materials on the concrete roof was reduced while it was increased on the ceramic tile roof. This is attributed to the fact that the concrete roof is nearly horizontal (very slightly sloped), and the wind action easily removes various materials which accumulate on it.
- Subjects
WATER harvesting; WATER quality; FLUSHING of water-pipes; ROOF runoff; DISINFECTION &; disinfectants
- Publication
Environmental Science & Pollution Research, 2017, Vol 24, Issue 27, p21997
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-017-9868-6