The metal-leaching and acid-neutralizing capacity of MSW incinerator ash co-disposed with MSW in landfill sites
The metal-leaching and acid-neutralizing capacity of MSW incinerator ash co-disposed with MSW in landfill sites
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DOI：
10.1016/j.jhazmat.2006.08.054
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发表时间：
2007-04-02
影响因子：
13.6
通讯作者：
Liao, Yuan-Lung
中科院分区：
文献类型：
--
作者：
Lo, Huang-Mu;Liao, Yuan-Lung
以城市生活垃圾焚烧炉(MSW)、底灰和飞灰为填埋场覆盖物或与垃圾共处理，研究了它们在填埋场中的潜在金属释放能力和酸中和能力。试验中使用了5个蒸渗仪(高1.2m，直径0.2m)，模拟填埋条件。4个处理含有底灰(BA)或飞灰(FA)，BAM：SW比分别为100和200g L-1，FA：MSW比分别为10和20 g L-1；5个对照不含灰。蒸渗仪被安排成包含四层，每层内BA或FA放置在MSW的顶部。每台渗滤仪用蠕动泵循环使用100毫升渗滤液，每周收集100毫升渗滤液以测量可溶性金属浓度。结果表明，渗滤液中可溶碱金属的浓度大小顺序为：Ca&Gt；K&Gt；Na&Gt；此外，含有FA的蒸渗仪采集的可溶碱金属Ca和K的浓度高于含有BA的蒸渗仪的浓度。重金属(Cd、铬、铜、镍、锌)的浓度除铅为2 mg L-1外，其余均为1 mg L-1。这些结果表明，对于碱金属，可能存在与酸滴定曲线结果一致的ANC，这将为垃圾在填埋场中的厌氧消化提供合适的条件。此外，重金属和痕量金属的浓度太低，不能对厌氧消化产生抑制作用，因此它们可以作为微量营养素对垃圾填埋场的生物稳定起到有益而不是有害的作用。(C)2006爱思唯尔B.V.保留所有权利。
Municipal solid waste (MSW) incinerator (MSWI) bottom ash and fly ash were used as landfill cover or were co-disposed with MSW to measure their potential metal-releasing and acid-neutralizing capacity (ANC) in landfill sites. Five lysimeters (height 1.2 m, diameter 0.2 m), simulating landfill conditions, were used in the experiment. Four contained either bottom ash (BA) or fly ash (FA) with BAM:SW ratios of 100 and 200 g L-1 and FA:MSW ratios of 10 and 20 g L-1, and the fifth was the control, which contained no ash. The lysimeters were arranged so as to contain four layers, with BA or FA placed on top of MSW within each layer. Each lysimeter was recirculated with 100 mL leachate using peristaltic pumps, and 100 mL of the leachate was collected weekly to measure the soluble metal concentrations. The results showed that the concentrations of soluble alkali metals measured in the leachate were in the order Ca > K > Na > Mg. In addition, the concentrations of soluble alkali metals of Ca and K collected from the lysimeters containing FA were found to be higher than the concentrations from the lysimeters containing BA. The concentrations of heavy metals (Cd, Cr, Cu, Ni, and Zn) were found to be < 1 mg L-1 except for Pb, which reached 2 mg L-1. These results suggest that for alkali metals there might be an ANC consistent with the results of an acid titration curve, which would provide suitable conditions for anaerobic digestion of the MSW in the landfill. Furthermore, heavy metals and trace metals were found in concentrations, which were too low to exert inhibitory effects on anaerobic digestion, and thus they could serve as micronutrients to exert beneficial rather than detrimental effects on landfill biostabilization. (c) 2006 Elsevier B.V. All rights reserved.