Nutrient leaching from extensive green roofs with different substrate compositions: a laboratory study

Water Science and Technology : a Journal of the International Association on Water Pollution Research
W ZhangW Che

Abstract

To investigate nutrient leaching from extensive green roofs, green roof platforms were established to investigate the effluent quantity and quality during artificial rainfall. When the influent volume reached three times the empty bed volume, for which the cumulative rainfall was around 300 mm, the effluent TP and COD concentrations of green roof platforms filled with peat soil did not tend to stabilize. For a long-term operation, the substrate depths had little significant influence on TN, TP and COD concentrations of the green roof effluents. A normalized cumulative emission process method was proposed to discuss the difference in various pollutant leaching processes. Obvious differences in the leaching process of different contaminants for green roof platforms filled with various substrates were observed. For the green roof filled with modified substrates, the nitrogen and phosphorus pollutant leaching rates were relatively high in the initial stage of green roof operation and the phosphorus leaching rate was higher than that of nitrogen. The green roof is a sink for TN, but not for TP and COD in this study. The outcomes are critical for the selection of green roof substrates and also contribute to green roof maintenance.

References

Nov 16, 2010·Environmental Pollution·D Bradley Rowe
Jan 17, 2012·Water Research·K VijayaraghavanR Balasubramanian
Jun 19, 2013·Environmental Pollution·Martin SeidlBernard De Gouvello
Aug 30, 2013·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Gianni Vesuviano, Virginia Stovin
Dec 30, 2014·Water Research·S Beecham, M Razzaghmanesh
Jun 23, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Agnieszka BusAnna Baryła

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Citations

Jan 31, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wei ZhangHailong Zhang
Jan 18, 2022·Environmental Science and Pollution Research International·Chen XuJian Zhan

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