Size effect on lysimeter test evaluating the properties of construction and demolition waste leachate
Size effect on lysimeter test evaluating the properties of construction and demolition waste leachate
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DOI：
10.1016/j.sandf.2015.06.005
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发表时间：
2015-08
影响因子：
3.7
通讯作者：
Tang Qiang;Kim Heejong;Endo Kazuto;Katsumi Takeshi;Inui Toru
中科院分区：
文献类型：
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作者：
Tang Qiang;Kim Heejong;Endo Kazuto;Katsumi Takeshi;Inui Toru
由于蒸渗仪费用相对较低，研究时间较短，因此常用于模拟填埋场环境条件。然而，蒸渗仪往往以各种几何特征（例如高/宽比和高度）操作，这可能导致物理和热力学特征的变化，并影响废物分解速率和沥滤行为。考虑到这些问题，在这项研究中，蒸渗仪试验进行了6个蒸渗仪，以评估渗滤液的产生和建筑和拆除垃圾（C&D废物）的淋溶行为的尺寸效应。根据蒸渗仪试验结果，增加蒸渗仪的宽度可以减小侧边墙流的可能性，过滤水可以在较短长度的蒸渗仪内得到较好的冲刷。增加高度只会导致上部负荷的增加，并导致废物具有更致密的微结构，并且在蒸渗仪底部具有更紧密的凝聚力，这不适合于可溶性成分或重金属的浸出。低高宽比的渗沥器能促进渗滤液的淋溶行为，加速渗滤液的稀释。此外，一些无机离子的释放行为表明，微生物活动对填埋场垃圾的淋溶行为有着重要的影响，在研究填埋场垃圾时不能忽视这一点。因此，在研究土壤的淋溶行为或微生物活性时，应选择较低高度和较低H/W比的蒸渗仪。这些结果有助于建立实验室规模的蒸渗仪试验的标准化可行的设计。
Lysimeters are always utilized to simulate the landfill environmental conditions due to their relatively low expense and the short duration of the research. However, lysimeters tend to be operated with various geometrical characteristics (e.g. height/width ratio and height) which can result in changes to the physical and thermodynamic characteristics, and affect the waste decomposition rates and leaching behavior. Considering these points, in this study, the lysimeter test was conducted using six lysimeters to evaluate the size effect on leachate generation and leaching behavior of construction and demolition waste residue (C&D waste). According to the lysimeter test results, increasing the width of the lysimeter can reduce the potential of side-edge-wall flow, and the filtration water can have a perfect flushing inside lysimeters with shorter lengths. Increasing the height merely results in an increase in upper loading, and results in waste with a denser micro-structure and with closer cohesion at the bottom of the lysimeters, which was not suitable for the leaching out of soluble constituents or heavy metals. The lysimeters with low height/width ratio can promote the leaching behavior and accelerate the dilution of landfill leacahte. In addition, the emission behaviors of some inorganic ions indicate microbial activity can have a significant effect on leaching behavior, which cannot be neglected when researching landfill waste. It is suggested that lysimeters with lower height and a lowerH/Wratio are a better choice when investigating leaching behavior or microbial activity. These results contribute to establishing standardized feasible designs for laboratory-scale lysimeter tests.