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首页> 外文期刊>Journal of Residuals Science & Technology >Assessing Risk Posed by Land Application of Ash from the Combustion of Wood and Tires
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Assessing Risk Posed by Land Application of Ash from the Combustion of Wood and Tires

机译：评估木材和轮胎燃烧产生的灰烬在土地上使用带来的风险

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The total and leachable metal concentrations in ash from the combustion of waste wood and vehicle tires (WT ash) were characterized. These data were then used to examine a variety of issues associated with determining whether the WT ash could be beneficially used outside of a landfill (e.g., land application as fill material, soil amendment). Metal release was assessed using standardized batch tests, lysimeter leaching tests, and additional leaching experiments targeting specific factors that impact metal leaching. The toxicity characteristic leaching procedure (TCLP) and the synthetic precipitation leaching procedure (SPLP) extracted similar metal concentrations. Although arsenic was detected at high concentrations in the WT ash totals analysis, it did not leach at concentrations that may pose a risk to human health and the environment. Another metal of potential concern with regard to groundwater contamination is lead. Lead leached from WT ash at 120, 55, 52, and 52 g/L using the WET, TCLP, SPLP, and DI water extraction, respectively. Lead was also encountered in the lysimeter leachate above its groundwater cleanup target level (GWCTL). In terms of risk assessment, from a direct human exposure pathway, arsenic was found to be the most limiting element. Comparison with the leaching SCTLs indicated that arsenic, chromium, and zinc would pose a potential risk to groundwater. The SPLP results did not find these metals to pose a risk, but has lead concentrations above GWCTL suggesting that using leaching SCTLs that are developed for soil is not appropriate for application to combustion ash. When compared to steady-state concentrations measured in the lysimeters, SPLP, TCLP and DI water lead concentrations matched very well suggesting that these concentrations reflected the pore water concentration for this ash.
机译：表征了废木材和车辆轮胎（WT灰）燃烧产生的灰中总金属和可浸出金属的浓度。然后将这些数据用于检查与确定是否可以在垃圾填埋场之外有效利用WT灰有关的各种问题（例如，将土地用作填充材料，土壤改良剂）。使用标准的批处理测试，溶渗仪浸出测试以及针对影响金属浸出的特定因素的其他浸出实验，评估了金属的释放。毒性特征浸出程序（TCLP）和合成沉淀浸出程序（SPLP）提取了相似的金属浓度。尽管在WT灰分总计分析中检测到高浓度的砷，但砷的浸出并未以可能对人体健康和环境构成风险的浓度浸出。与地下水污染有关的另一种潜在金属是铅。使用WET，TCLP，SPLP和DI水提取分别以120 g，55 g，52 g和52 g / L的重量从WT灰中浸出铅。溶渗仪渗滤液中的地下水净化目标水平（GWCTL）以上也遇到了铅。在风险评估方面，从直接的人类接触途径中，发现砷是最大的限制元素。与浸出SCTL的比较表明，砷，铬和锌将对地下水构成潜在风险。 SPLP结果并未发现这些金属构成风险，但铅浓度高于GWCTL，这表明使用为土壤开发的浸出SCTL不适合用于燃烧灰分。与在溶渗仪中测得的稳态浓度相比，SPLP，TCLP和DI水铅浓度非常匹配，表明这些浓度反映了该灰的孔隙水浓度。

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