Phosphate Leaching from Green Roof Substrates—Can Green Roofs Pollute Urban Water Bodies?

摘要: Green roofs are an effective stormwater measure due to high water retention capacity and the ability of delaying runoff. However, low importance is still given pollutant leaching potential substrates used in green roof construction. The aim study estimate concentrations loads P-PO43− runoff from extensive intensive substrates. To achieve this goal, several commonly-used fresh were analyzed for different scale experiments, laboratory batch tests, column long-term monitoring open air containers. results confirmed that contain phosphorus significant amounts 17–145 mg∙P-PO43−/kg and, thus, can contribute eutrophication freshwater ecosystems. High correlation between phosphate content estimated by HCl extraction cumulative load leachate tests suggests test be recommended comparison selection with P leaching. Volume-weighted mean UALs higher cases substrates, but there was no clear relationship substrate type observed concentration range. avoid increasing urban receivers implementation reduction measures strongly recommended.