Journal
WATER SCIENCE AND TECHNOLOGY
Volume 73, Issue 12, Pages 3027-3032Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2016.173
Keywords
extensive substrate; green roofs; phosphorus; Polonite (R)
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The aim of the study is to assess the influence of drainage layer made of reactive material Polonite (R) on the water retention and P-PO4 concentration in runoff. A column experiment was performed for extensive substrate underlined by 2 cm of Polonite (R) layer (SP) and the same substrate without supporting layer as a reference (S). The leakage phosphorus concentration ranged from 0.001 to 0.082 mg P-PO4 center dot L-1, with average value 0.025 P-PO4 center dot L-1 of S experiment and 0.000-0.004 P-PO4 center dot L-1 and 0.001 P-PO4 center dot L-1 of SP experiment, respectively. The 2 cm layer of Polonite (R) was efficient in reducing P outflow from green roof substrate by 96%. The average effluent volumes from S and SP experiments amounted 61.1 mL (5.8-543.3 mL) and 46.4 mL (3.3-473.3 mL) with the average irrigation rate of 175.5 mL (6.3-758.0 mL). The substrate retention ability of S and SP experiments was 65% and 74%, respectively. Provided with reactive materials, green roof layers implemented in urban areas for rain water retention and delaying runoff also work for protection of water quality.
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