College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China.
Department of Civil Engineering, University of Victoria, PO Box 1700 STN CSC, Victoria, BC, V8W 2Y2, Canada.
Environ Sci Pollut Res Int. 2020 Apr;27(12):14184-14197. doi: 10.1007/s11356-020-08007-9. Epub 2020 Feb 10.
In this study, the physicochemical properties, microstructure, and heavy metal leaching potential of various municipal solid waste incinerated-bottom ash (MSWI-BA) particle sizes were detected. The environmental risks that possibly result from the utilization of MSWI-BA aggregate in road construction are discussed. The air-dried MSWI-BA was sieved into four groups, including 4.75-9.5 mm, 2.36-4.75 mm, 0.075-2.36 mm, and < 0.075 mm. X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses were conducted. It was found that the main elements of MSWI-BA are Ca, Si, and Al; the major heavy metals are Zn, Cu, Cr, and Pb, and the main mineral compositions are quartz and calcite. Even though the major elements were found to be related to MSWI-BA particle size, the micropores, attached particles, and hydration products were shown to be independent on the particle size. The standard leaching test and a simulated leaching experiment with four solid/liquid ratios were implemented to study the leaching behavior of Zn, Cu, Pb, and Cr. Results showed that the leaching characteristics of selected metals were affected by the species of metal, MSWI-BA particle size, solid/liquid ratio, and the test method. The MSWI-BA aggregate was found to be an appropriate substitute material for natural aggregate in road construction due to its low metal leaching potential.
本研究检测了不同粒径的城市生活垃圾焚烧底灰（MSWI-BA）的物理化学性质、微观结构和重金属浸出潜力。讨论了将 MSWI-BA 集料用于道路建设可能带来的环境风险。风干的 MSWI-BA 被筛分成四组，包括 4.75-9.5mm、2.36-4.75mm、0.075-2.36mm 和 <0.075mm。进行了 X 射线荧光（XRF）、X 射线衍射（XRD）和扫描电子显微镜（SEM）分析。结果表明，MSWI-BA 的主要元素是 Ca、Si 和 Al；主要重金属是 Zn、Cu、Cr 和 Pb，主要矿物成分是石英和方解石。尽管主要元素与 MSWI-BA 粒径有关，但微孔、附着颗粒和水合产物与粒径无关。进行了标准浸出试验和四种固液比的模拟浸出试验，以研究 Zn、Cu、Pb 和 Cr 的浸出行为。结果表明，所选金属的浸出特性受金属种类、MSWI-BA 粒径、固液比和测试方法的影响。由于 MSWI-BA 集料具有较低的金属浸出潜力，因此被认为是道路建设中天然集料的合适替代材料。
