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Assessment of long-term pH developments in leachate from waste incineration residues

机译：废物焚烧残渣中渗滤液长期pH变化的评估

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Environmental assessment of residue disposal needs to account for long-term changes in leaching conditions. Leaching of heavy metals from incineration residues are highly affected by the leachate pH; the overall environmental consequences of disposing of these residues are therefore greatly influenced by changes in pH over time. The paper presents an approach for assessing pH changes in leachate from municipal solid waste incineration (MSWI) air-pollution-control (APC) residues. Residue samples were subjected to a stepwise batch extraction method in order to obtain residue samples at a range of pH values (similar to common pH-dependence tests), and then on these samples to determine leaching of alkalinity as well as remaining solid phase alkalinity. On a range of APC residues covering various pretreatment and disposal options, this procedure was used to determine leachable and residual alkalinity as a function of pH. Mass balance calculations for typical disposal scenarios were used to provide data on pH as a function of the liquid-to-solid (L/S) ratio in the leaching system. Regardless of residue type and pretreatment, pH was found to stay above 7 for L/S ratios up to about 2000 L kg~(-1) corresponding to about 100 000 years in typical landfill scenarios. It was found that pH changes were mainly governed by alkalinity decreases from leaching processes rather than neutralization reactions. The results suggest that leaching testing for assessment purposes should be carried out in the alkaline range, for example, at pH 9. The paper offers a thorough basis for further modelling of incineration residue leaching and for modelling the environmental consequences of landfilling and utilization of these residues.
机译：残留物处置的环境评估需要考虑浸出条件的长期变化。垃圾渗滤液的pH值严重影响了焚烧残渣中重金属的浸出。因此，随着时间的推移，pH值的变化会极大地影响处理这些残留物的整体环境后果。本文提出了一种评估市政固体废物焚烧（MSWI）空气污染控制（APC）残留物中渗滤液pH值变化的方法。对残留样品进行分步分批萃取法，以获得在一定pH值范围内的残留样品（类似于常见的pH依赖性测试），然后在这些样品上确定碱度的浸出以及剩余的固相碱度。在涵盖各种预处理和处置选项的一系列APC残留物上，该程序用于确定可浸出和残留碱度随pH的变化。使用典型处置方案的质量平衡计算来提供有关pH值的数据，作为浸出系统中液/固（L / S）比的函数。无论残留物的类型和预处理如何，L / S比值高达2000 L kg〜（-1）时的pH值都保持在7以上，相当于典型的垃圾填埋场约10万年。发现pH变化主要由浸出过程中碱度的降低而不是中和反应决定。结果表明，为评估目的而进行的浸出测试应在碱性范围内进行，例如在pH值为9的情况下进行。本文为进一步模拟焚烧残渣浸出以及为垃圾掩埋和利用这些废弃物的环境后果建模提供了透彻的基础。残留物。

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