4.7 Article

Effect of substrate depth and rain-event history on the pollutant abatement of green roofs

Journal

ENVIRONMENTAL POLLUTION
Volume 183, Issue -, Pages 195-203

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.05.026

Keywords

Vegetated roofs; Nutrients; Heavy metals; Emission; Retention; Columns experiments

Funding

  1. French network for research on civil engineering, RGCU

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This study compares the effectiveness of two different thickness of green roof substrate with respect to nutrient and heavy metal retention and release. To understand and evaluate the long term behaviour of green roofs, substrate columns with the same structure and composition as the green roofs, were exposed in laboratory to artificial rain. The roofs act as a sink for C, N, P, zinc and copper for small rain events if the previous period was principally dry. Otherwise the roofs may behave as a source of pollutants, principally for carbon and phosphorus. Both field and column studies showed an important retention for Zn and Cu. The column showed, however, lower SS, DOC and metal concentrations in the percolate than could be observed in the field even if corrected for run-off. This is most probably due to the difference in exposition history and weathering processes. (C) 2013 Elsevier Ltd. All rights reserved.

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