Zhang Wei, Zhong Xing, Che Wu, Sun Huichao, Zhang Hailong
Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, 100044 Beijing, China E-mail:
Zhuanghe Urban-Rural Planning and Development Bureau, Zhuanghe 116400, China.
Water Sci Technol. 2018 Dec;78(11):2247-2255. doi: 10.2166/wst.2018.501.
In this study, laboratory-scale green (e.g. living) roof platforms were established to assess the potential use of polluted river sediment in their substrate mixture. The mean runoff retention of the green roof platforms, which contained peat and/or river sediment, after 11 artificial rainfall events was >72%, significantly higher than traditional roofs. However, green roof platforms that had been filled with peat soil showed chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) leaching. Green roofs that had used river sediment showed good leaching control for COD, TN and TP. The cumulative leaching masses from the green roofs contained 30% (COD), 42% (TN) and 47% (TP) as much as the total leaching mass from traditional roofs, and the Cu, Zn, Cd and Pb leaching risk from green roofs when river sediments are used as part of a substrate mixture was relatively low. Despite some nutrient leaching in the initial phase of runoff from the green roofs, river sediment has the potential to be used as a substrate for extensive green roofs.
在本研究中，建立了实验室规模的绿色（如活体）屋顶平台，以评估污染河流沉积物在其基质混合物中的潜在用途。在11次人工降雨事件后，含有泥炭和/或河流沉积物的绿色屋顶平台的平均径流截留率>72%，显著高于传统屋顶。然而，填充泥炭土的绿色屋顶平台出现了化学需氧量（COD）、总氮（TN）和总磷（TP）的淋溶现象。使用河流沉积物的绿色屋顶对COD、TN和TP的淋溶控制良好。绿色屋顶的累积淋溶质量分别为传统屋顶总淋溶质量的30%（COD）、42%（TN）和47%（TP），当河流沉积物用作基质混合物的一部分时，绿色屋顶的铜、锌、镉和铅淋溶风险相对较低。尽管绿色屋顶径流初期存在一些养分淋溶现象，但河流沉积物有潜力用作粗放型绿色屋顶的基质。
