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Sequential risk mitigation and the role of natural recovery in contaminated sediment projects

机译：顺序减轻风险和自然恢复在受污染的沉积物项目中的作用

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Sequential risk mitigation approaches the remediation of contaminated sediments in three phases designed to: (1) immediately reduce the ecological and human health risks associated with high levels of contamination, using methods such as the confinement or capping of high-risk materials; (2) reduce the risks associated with moderate levels of pollution to a minimum, on a less urgent schedule and at a lower cost; and (3) address areas of limited contamination through a combination of natural recovery and enhanced natural recovery (to aid or speed those natural processes). Natural recovery, the reduction of contaminant concentrations through natural processes, is based on the practical observation that overall ecosystem recovery appears to be largely a function of time. Sediment decomposition and the mixing of new and old sediments by bottom-dwelling organisms can both contribute to reduced contaminant concentrations. Knowledge of these processes-sediment decomposition, sediment mixing by bottom-dwelling organisms, and chemical residence time is critical in the development of appropriate ecosystem recovery and waste management strategies. Evaluations to support natural recovery predictions are designed to collect and evaluate information necessary to determine whether surface sediment chemical concentrations, with adequate source control, will reach the cleanup standards within a ten-year period. (C) 1998 IAWQ. Published by Elsevier Science Ltd. [References: 3]
机译：降低风险的顺序性方法分三个阶段对污染的沉积物进行修复，旨在：（1）使用限制或限制高风险材料的方法，立即降低与高污染水平相关的生态和人类健康风险; （2）以较不紧急的时间表和较低的成本将与中等污染水平有关的风险降低到最低程度; （3）通过自然恢复和增强自然恢复相结合来解决污染有限的地区（以帮助或加快这些自然过程）。自然恢复是指通过自然过程减少污染物浓度的方法，是基于实际观察结果，即整个生态系统恢复在很大程度上是时间的函数。底栖生物对沉积物的分解以及新旧沉积物的混合都可以降低污染物的浓度。这些过程的知识-沉积物分解，底栖生物的沉积物混合以及化学停留时间对于制定适当的生态系统恢复和废物管理策略至关重要。支持自然恢复预测的评估旨在收集和评估必要的信息，以确定在适当的源头控制下，地表沉积物化学浓度在十年内是否会达到清理标准。 （C）1998 IAWQ。由Elsevier Science Ltd.发布[参考：3]

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