期刊
URBAN WATER JOURNAL
卷 14, 期 8, 页码 804-810出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/1573062X.2016.1264429
关键词
Green roof; runoff quality; packed column; metals; best management practices
资金
- Ramalingaswami Re-entry Fellowship (Department of Biotechnology, Ministry of India, India)
Growth substrate plays an important role in determining the quality of runoff from green roofs. However, no systematic research has been conducted to design a substrate to improve runoff quality. Hence, the present study aimed at designing and developing a green roof substrate using low-cost and environmentally-benign materials. The inorganic fraction of the substrate includes purosil, vermiculite, sand and light-weight clay aggregates (LECA); whereas the organic fraction includes coco-peat and Sargassum wightii. Through factorial design, 13 different substrate mixes were prepared and the optimum mix (20% purosil, 30% vermiculite, 10% sand, 20% LECA, 10% coco-peat and 10% S. wightii) was found to have high water holding capacity (67.6%), air filled porosity (21%), hydraulic conductivity (5524mm/h) and low bulk density (495kg/m(3)). The substrate also provided maximum support for the growth of Portulaca oleracea. Experiments with metal-contaminated influent from the down-flow of a packed reactor revealed that the green roof substrate possesses a high sorption capacity towards various metal ions.
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