Construction of lysimeters for researching the leaching of potentially toxic elements from building materials
Janez Turk, J. Urbanc, A. Mladenovič, Alenka Pavlin, P. Oprčkal, K. F. Bizjak, Barbara Likar, Marko Brodnik, N. Mali
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引用次数: 1
Abstract
By using recycled waste in construction, natural materials are being replaced, thus establishing a circular economy at the local level. An important aspect is also the conservation of natural resources. This is especially important in case of earthworks (embankments, backfills), which are large consumers of materials. Compared to natural aggregates and earth, geotechnical composites based on recycled materials can contain a higher total content of potentially toxic elements (heavy metals, chloride, sulphate, fluoride, organic pollutants etc.). The prerequisite for beneficial use of such composites is that the potentially toxic elements are immobilized in the composites, meaning that they are chemically inert. Potential environmental impacts, especially those associated with transfer of potentially toxic elements from new geotechnical composites into soil (aquifer respectively), are usually evaluated on laboratory scale, while their behaviour in real environment is usually poorly investigated. For this reason, there is a demand for the development of sensitive, reliable, and cost and time efficient monitoring tools for determining mass flows of potentially toxic elements from building materials, for example geotechnical composites, which are under the influence of various environmental factors. This paper presents the construction of field laboratory, based on a system of pan lysimeters. The lysimeters are used to collect leachate from geotechnical composites based on recycled materials. They are constructed in a way to be relatively low cost and at the same time large enough to representatively reflect the processes in geotechnical fills. Obtained data on the amount and quality of leachate can be used as a basis for the study of immobilization processes and for water balance. Moreover, this data will be used as input in the geochemical numerical model for the simulation of transport of potentially toxic elements released from geotechnical fills in different types of aquifers (alluvial aquifer with intergranular porosity, aquifer in consolidated rocks with fissure porosity). GEOLOGIJA 63/2, 271-280, Ljubljana 2020 https://doi.org/10.5474/geologija.2020.020 © Author(s) 2020. CC Atribution 4.0 License 272 J. TURK, J. URBANC, A. MLADENOVIČ, A. PAVLIN, P. OPRČKAL, K. FIFER BIZJAK, B. LIKAR, M. BRODNIK & N. MALI
用于研究建筑材料中潜在有毒元素浸出的溶解仪的构建
通过在建筑中使用可回收的废物,天然材料正在被取代,从而在地方一级建立循环经济。一个重要方面也是保护自然资源。这在土方工程(路堤、回填)的情况下尤其重要,因为土方工程是材料的大量消耗者。与天然骨料和泥土相比,基于回收材料的岩土复合材料可能含有更高的潜在有毒元素(重金属、氯化物、硫酸盐、氟化物、有机污染物等)总含量。有益使用此类复合材料的先决条件是,潜在有毒元素固定在复合材料中,这意味着它们具有化学惰性。潜在的环境影响,特别是与潜在有毒元素从新的岩土复合材料转移到土壤(分别为含水层)有关的影响,通常在实验室规模上进行评估,而对其在真实环境中的行为的调查通常很少。出于这个原因,需要开发敏感、可靠、成本和时间有效的监测工具,用于确定建筑材料(例如岩土复合材料)中潜在有毒元素的质量流量,这些材料受到各种环境因素的影响。本文介绍了基于泛蒸渗计系统的现场实验室的建设。蒸渗计用于收集基于回收材料的岩土复合材料的渗滤液。它们的建造成本相对较低,同时又足够大,能够代表性地反映岩土填充的过程。所获得的渗滤液的量和质量数据可作为研究固定化过程和水平衡的基础。此外,这些数据将被用作地球化学数值模型的输入,用于模拟不同类型含水层(具有粒间孔隙的冲积含水层、具有裂隙孔隙的固结岩石中的含水层)中岩土填料释放的潜在有毒元素的输运。格鲁吉亚2020年卢布尔雅那,第63/2271-280页https://doi.org/10.5474/geologija.2020.020©作者2020。CC Atribution 4.0许可证272 J.TURK,J.URBANC,A.MLADENOVIČ,A.PAVLIN,P.OPRČKAL,K.FIFER BIZJAK,B.LIKAR,M.BRODNIK&N.MALI
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