Vijayaraghavan K, Joshi Umid Man
Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Sustainable Development and Water Alliance, National University of Singapore, 2 Engineering Drive 2, 117577, Singapore.
Environ Pollut. 2014 Nov;194:121-129. doi: 10.1016/j.envpol.2014.07.021. Epub 2014 Aug 6.
The present study examines whether green roofs act as a sink or source of contaminants based on various physico-chemical parameters (pH, conductivity and total dissolved solids) and metals (Na, K, Ca, Mg, Al, Fe, Cr, Cu, Ni, Zn, Cd and Pb). The performance of green roof substrate prepared using perlite, vermiculite, sand, crushed brick, and coco-peat, was compared with local garden soil based on improvement of runoff quality. Portulaca grandiflora was used as green roof vegetation. Four different green roof configurations, with vegetated and non-vegetated systems, were examined for several artificial rain events (un-spiked and metal-spiked). In general, the vegetated green roof assemblies generated better-quality runoff with less conductivity and total metal ion concentration compared to un-vegetated assemblies. Of the different green roof configurations examined, P. grandiflora planted on green roof substrate acted as sink for various metals and showed the potential to generate better runoff.
本研究基于各种物理化学参数（pH值、电导率和总溶解固体）以及金属（钠、钾、钙、镁、铝、铁、铬、铜、镍、锌、镉和铅），考察绿色屋顶是污染物的汇还是源。基于径流质量的改善，将使用珍珠岩、蛭石、沙子、碎砖和椰壳泥炭制备的绿色屋顶基质的性能与当地花园土壤进行了比较。大花马齿苋被用作绿色屋顶植被。针对几次人工降雨事件（未添加金属和添加金属），对四种不同的绿色屋顶配置（有植被和无植被系统）进行了研究。总体而言，与无植被组件相比，有植被的绿色屋顶组件产生的径流质量更好，电导率和总金属离子浓度更低。在所研究的不同绿色屋顶配置中，种植在绿色屋顶基质上的大花马齿苋对各种金属起到了汇的作用，并显示出产生更好径流的潜力。
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