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Effect of first-flush device, roofing material, and antecedent dry days on water quality of harvested rainwater

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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 NH4-N, orthophosphate, and Ca2+. 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.

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Authors and Affiliations

  1. Laboratory of Ecological Engineering and Technology, Department of Environmental Engineering, School of Engineering, Democritus University of Thrace, 67100, Xanthi, Greece

    Georgios D. Gikas

  2. Centre for the Assessment of Natural Hazards and Proactive Planning, & Laboratory of Reclamation Works and Water Resources Management, Department of Infrastructure and Rural Development, School of Rural and Surveying Engineering, National Technical University of Athens, Zografou, 157 80, Athens, Greece

    Vassilios A. Tsihrintzis

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  1. Georgios D. Gikas
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  2. Vassilios A. Tsihrintzis
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Correspondence to Vassilios A. Tsihrintzis.

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Responsible editor: Philippe Garrigues

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Gikas, G.D., Tsihrintzis, V.A. Effect of first-flush device, roofing material, and antecedent dry days on water quality of harvested rainwater. Environ Sci Pollut Res 24, 21997–22006 (2017). https://doi.org/10.1007/s11356-017-9868-6

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  • DOI: https://doi.org/10.1007/s11356-017-9868-6

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