Leaching and geochemical modeling of asbestos-cement waste and mine asbestos

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Vangelis Soultanidis, Evangelos A. Voudrias
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Abstract

Asbestos-Containing Materials (ACMs) were widely used in the construction sector but, due to their harmful health effects, many countries have banned their use. ACMs are classified as hazardous and, in contact with water, produce potentially harmful leachates. The objective of this work was to determine the leaching behavior of 20 elements from two asbestos-cement materials and mine asbestos samples across the entire pH range and varying liquid-to-solid ratios (column tests). The pH-dependence tests showed consistent leaching patterns across the three materials. Geochemical speciation model (LeachXS) predictions were successful in most cases of the batch experiments and were improved by adjusting iron oxides concentration for some elements. Model predictions were successful for fewer elements in the column experiments. Depending on the pH, element release was controlled by respective solid phase dissolution, sorption onto iron oxides and substitution in ettringite. Some leaching concentrations exceeded the EU limits for granular non-hazardous waste landfills. Considering the strongly alkaline nature of monolithic asbestos-cement waste undergoing carbonation, we propose all three materials to be disposed of in non-hazardous waste landfills, according to EU legislation. A case study concluded that geochemical modeling of ACMs leaching is a useful tool in estimating element release under various environmental conditions.

Abstract Image

石棉-水泥废物和矿山石棉的沥滤和地球化学建模
含石棉材料(ACMs)曾广泛用于建筑行业,但由于其对健康有害,许多国家已禁止使用。含石棉材料被归类为有害物质,与水接触后会产生潜在的有害浸出物。这项工作的目的是确定两种石棉水泥材料和矿山石棉样本中 20 种元素在整个 pH 值范围内和不同液固比(柱测试)下的浸出行为。与 pH 值相关的测试表明,三种材料的沥滤模式是一致的。在大多数情况下,批量实验中的地球化学标示模型(LeachXS)预测都取得了成功,并通过调整某些元素的氧化铁浓度得到了改善。在柱实验中,模型对较少元素的预测取得了成功。根据 pH 值的不同,元素的释放分别受到固相溶解、铁氧化物吸附和乙曲矿替代的控制。一些沥滤浓度超过了欧盟对颗粒状非危险废物填埋场的限制。考虑到正在进行碳化的整体石棉-水泥废物的强碱性,我们建议根据欧盟法律将所有这三种材料填埋到无害废物填埋场。一项案例研究得出结论,含石棉材料浸出的地球化学模型是估算各种环境条件下元素释放量的有用工具。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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