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TitleEffect of P-reactive drainage aggregates on green roof runoff quality
Publication TypeJournal Article
Year of Publication2014
AuthorsKarczmarczyk, A, Baryła, A, Bus, A
Volume6
Start Page2575-2589
Issue9
Pagination15 p.; 6 Fig.; 6 Tab.;
Date Published08/2014
PublisherMDPI AG
Place PublishedBasel, Switzerland
Publication LanguageEnglish
Keywordsaggregates, chalcedony, green roof, phosphorus, Pollytag, serpentinite, substrate
Abstract

The main hypothesis of the presented study is that the negative effect of phosphorus leaching from a green roof substrate can be reduced by including P-reactive material in a drainage layer. In this work, different aggregates (Pollytag®, lightweight expanded clay aggregates, chalcedony, serpentynite and crushed autoclaved aerated concrete) to be used as the green roof drainage layer are described. Physical parameters, e.g., granulometric composition, water absorption, bulk density and porosity are assessed. A phosphorus sorption isotherm and a kinetic test were performed. Physical and chemical characteristics of the materials were used as a base for choosing the best media for the drainage layer. The P-removal efficiency of crushed autoclaved aerated concrete was confirmed in a column experiment. Adding the implementation of the P-reactive material in a drainage layer during construction can reduce the negative effect of substrate on green roof runoff quality. [authors abstract]

DOI10.3390/w6092575

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