The Weathering Of Municipal Solid Waste Incineration Bottom Ash Evaluated By Some Weathering Indices For Natural Rock
The Weathering Of Municipal Solid Waste Incineration Bottom Ash Evaluated By Some Weathering Indices For Natural Rock
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用天然岩石的一些风化指数评价城市生活垃圾焚烧底灰的风化
DOI：
10.1016/j.wasman.2012.06.009
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发表时间：
2012
期刊：
影响因子：
8.1
通讯作者：
Takayuki Shimaoka
中科院分区：
文献类型：
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作者：
Fumitake Takahashi;Takayuki Shimaoka
生活垃圾焚烧残渣的风化是一个复杂的现象。这使得描述新鲜/风化垃圾底灰中常量和微量元素的淋溶行为变得困难，而这些元素与pH中和和次生矿物的形成是相互作用的。本研究将天然岩石剖面的矿物风化指数应用于新鲜/填埋的垃圾焚烧底灰，研究这些风化指数与填埋时间和组分元素淋溶浓度的关系。测试的矿物风化指数有风化潜力指数(WPI)、Ruxton比(R)、Parker风化指数(WIP)、Vogt残留物指数(V)、化学风化指数(CIA)、化学风化指数(CIW)、斜长石蚀变指数(PIA)、硅钛指数(STI)、Miura风化指数(Wm)和霍德风化指数(Ks)。在0.2%的显著水平上，韦尔奇t检验表明，所有风化指数都可以区分新鲜和填埋的垃圾底灰。然而，R和STI对填埋底灰的结果与理论预期相反。WPI、WIP、Wm、Ks与垃圾填埋场底灰回收时间呈良好的线性关系。因此，这四个指标可以作为识别新鲜/风化垃圾底灰和估算风化时间的指标。尽管WPI与渗滤液pH相关性较弱，但其他风化指标相关性不显著。此外，所有风化指数均不能定量解释土壤中Al、Ca、Cu、Zn的淋溶浓度。正确修正风化指数的难度很大，这表明包括表面吸附、与DOM络合等在内的地球化学模拟似乎是描述新鲜/风化垃圾底灰中常量和微量元素淋溶行为的唯一途径。
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 indentify 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.