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<p>The Port of Savannah is the fourth busiest and fastest-growing harbor in the USA, located approximately 30&#xa0;km inland from the Atlantic Ocean along the Savannah River. To accommodate post-Panamax ships, the Savannah Harbor Expansion Project deepened the shipping channel from 12.8 to 14.3&#xa0;m, significantly increasing the dredged material volume beyond the typical 6 million cubic meters dredged annually. Given the increasing demand for land to dispose of dredged materials, this study aimed to evaluate the environmental impacts associated with the beneficial use of dredged sediments, specifically focusing on their application as non-structural fill and supplementary cementitious materials. A life cycle assessment was performed to compare these options with traditional materials. To ensure robustness and reliability, sensitivity and uncertainty analyses were incorporated into the study. The findings suggest that beneficial use of dredged sediments can significantly reduce environmental impacts, particularly global warming potential, with up to a 67% reduction when used as non-structural fill, and a up to a 44% reduction when used as supplementary cementitious materials. Additionally, sensitivity analyses demonstrate the influence of transportation distances, water content, and boiler efficiency on environmental outcomes. Overall, the study proves the viability of dredged sediments as alternatives in non-structural fill and supplementary cementitious materials from the perspectives of environmental impacts.</p>

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Life Cycle Assessment of Dredged River Sediments: Beneficial use as Non-Structural Fill and Supplementary Cementitious Materials

  • 期刊论文

  • 发表日期：

    2025年4月18日

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  • Hejintao Huang,
  • Susan E. Burns,
  • Daniel Benkeser,
  • Kimberly E. Kurtis

摘要

The Port of Savannah is the fourth busiest and fastest-growing harbor in the USA, located approximately 30 km inland from the Atlantic Ocean along the Savannah River. To accommodate post-Panamax ships, the Savannah Harbor Expansion Project deepened the shipping channel from 12.8 to 14.3 m, significantly increasing the dredged material volume beyond the typical 6 million cubic meters dredged annually. Given the increasing demand for land to dispose of dredged materials, this study aimed to evaluate the environmental impacts associated with the beneficial use of dredged sediments, specifically focusing on their application as non-structural fill and supplementary cementitious materials. A life cycle assessment was performed to compare these options with traditional materials. To ensure robustness and reliability, sensitivity and uncertainty analyses were incorporated into the study. The findings suggest that beneficial use of dredged sediments can significantly reduce environmental impacts, particularly global warming potential, with up to a 67% reduction when used as non-structural fill, and a up to a 44% reduction when used as supplementary cementitious materials. Additionally, sensitivity analyses demonstrate the influence of transportation distances, water content, and boiler efficiency on environmental outcomes. Overall, the study proves the viability of dredged sediments as alternatives in non-structural fill and supplementary cementitious materials from the perspectives of environmental impacts.