Faculty of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Waste Manag. 2012 Dec;32(12):2294-305. doi: 10.1016/j.wasman.2012.06.009. Epub 2012 Jul 12.
The weathering of municipal solid waste incineration (MSWI) residues consists of complicated phenomena. This makes it difficult to describe leaching behaviors of major and trace elements in fresh/weathered MSWI bottom ash, which was relevant interactively to pH neutralization and formation of secondary minerals. In this study, mineralogical weathering indices for natural rock profiles were applied to fresh/landfilled MSWI bottom ash to investigate the relation of these weathering indices to landfill time and leaching concentrations of component elements. Tested mineralogical weathering indices were Weathering Potential Index (WPI), Ruxton ratio (R), Weathering Index of Parker (WIP), Vogt's Residual Index (V), Chemical Index of Alternation (CIA), Chemical Index of Weathering (CIW), Plagioclase Index of Alternation (PIA), Silica-Titania Index (STI), Weathering Index of Miura (Wm), and Weatherability index of Hodder (Ks). Welch's t-test accepted at 0.2% of significance level that all weathering indices could distinguish fresh and landfilled MSWI bottom ash. However, R and STI showed contrasted results for landfilled bottom ash to theoretical expectation. WPI, WIP, Wm, and Ks had good linearity with reclamation time of landfilled MSWI bottom ash. Therefore, these four indices might be applicable as an indicator to identify fresh/weathered MSWI bottom ash and to estimate weathering time. Although WPI had weak correlation with leachate pH, other weathering indices had no significant correlation. In addition, all weathering indices could not explain leaching concentration of Al, Ca, Cu, and Zn quantitatively. Large difficulty to modify weathering indices correctly suggests that geochemical simulation including surface sorption, complexation with DOM, and other mechanisms seems to be the only way to describe leaching behaviors of major and trace elements in fresh/weathered MSWI bottom ash.
城市固体废物焚烧（MSWI）残渣的风化由复杂的现象组成。这使得难以描述新鲜/风化的 MSWI 底灰中主要和微量元素的浸出行为，这与 pH 值中和和次生矿物的形成有关。在这项研究中，天然岩石剖面的矿物风化指数被应用于新鲜/填埋的 MSWI 底灰中，以研究这些风化指数与填埋时间和成分元素浸出浓度的关系。测试的矿物风化指数包括风化潜力指数（WPI）、鲁克斯顿比（R）、帕克风化指数（WIP）、沃格特残余指数（V）、交替化学指数（CIA）、风化化学指数（CIW）、斜长石交替指数（PIA）、硅钛指数（STI）、三浦风化指数（Wm）和霍德风化性指数（Ks）。韦尔奇 t 检验在 0.2%的显著水平上接受了所有风化指数都可以区分新鲜和填埋的 MSWI 底灰的结论。然而，R 和 STI 对填埋底灰的结果与理论预期相反。WPI、WIP、Wm 和 Ks 与填埋 MSWI 底灰的开垦时间呈良好的线性关系。因此，这四个指数可能适用于识别新鲜/风化的 MSWI 底灰和估计风化时间的指标。尽管 WPI 与浸出液 pH 值有弱相关性，但其他风化指数与浸出液 pH 值无显著相关性。此外，所有风化指数都不能定量解释 Al、Ca、Cu 和 Zn 的浸出浓度。正确修改风化指数的困难表明，包括表面吸附、与 DOM 络合和其他机制的地球化学模拟似乎是描述新鲜/风化的 MSWI 底灰中主要和微量元素浸出行为的唯一方法。
