Scholarlink

<p>Ex-situ remediation technologies are widely deployed for heavy metal-contaminated sites in China due&#xa0;to their efficiency, but their carbon emissions pose a significant challenge to environmental sustainability. Here, we established a life cycle assessment (LCA) framework to quantify the carbon emissions of ex-situ remediation technologies in China, identifying emission hotspots and reduction pathways. The model, validated against literature data, encompassed anthropogenic emission sources for typical ex-situ techniques, innovatively incorporating site-measured soil organic carbon (SOC) change. Empirical analysis of three representative remediation cases across China revealed distinct carbon emission patterns and key contributing sources for different technologies. Among the evaluated technologies, soil washing combined with landfilling exhibits the lowest carbon emission intensity (26.08&#xa0;kg CO₂-eq/m3), making it the most carbon-efficient option for ex-situ heavy metal remediation in China. However, its application is constrained by the need for efficient wastewater management. Chemical stabilization presents a moderate carbon footprint (56.94&#xa0;kg CO₂-eq/m3) and is widely applicable, whereas cement kiln co-processing (468.64&#xa0;kg CO₂-eq/m3) should be reserved for heavily contaminated sites, despite its high carbon intensity. The model demonstrated higher accuracy by accounting for SOC change, a factor often overlooked. This developed LCA model offers a robust tool for quantifying the carbon footprint of site remediation technologies in China. Our findings emphasize the importance of optimizing key emission processes and integrating carbon management into remediation planning to align contamination control with climate goals.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Life Cycle Assessment Framework for Carbon Emission Quantification in Ex-Situ Heavy Metal Remediation: Case Studies from China

  • 期刊论文

  • 发表日期：

    2026年6月29日

查看全文
  • Lina Zou,
  • Shu Zhang,
  • Yefei Tong,
  • Xiao Bao,
  • Xia An,
  • Lu Chen,
  • Xue Guo,
  • Fang Zhang

摘要

Ex-situ remediation technologies are widely deployed for heavy metal-contaminated sites in China due to their efficiency, but their carbon emissions pose a significant challenge to environmental sustainability. Here, we established a life cycle assessment (LCA) framework to quantify the carbon emissions of ex-situ remediation technologies in China, identifying emission hotspots and reduction pathways. The model, validated against literature data, encompassed anthropogenic emission sources for typical ex-situ techniques, innovatively incorporating site-measured soil organic carbon (SOC) change. Empirical analysis of three representative remediation cases across China revealed distinct carbon emission patterns and key contributing sources for different technologies. Among the evaluated technologies, soil washing combined with landfilling exhibits the lowest carbon emission intensity (26.08 kg CO₂-eq/m3), making it the most carbon-efficient option for ex-situ heavy metal remediation in China. However, its application is constrained by the need for efficient wastewater management. Chemical stabilization presents a moderate carbon footprint (56.94 kg CO₂-eq/m3) and is widely applicable, whereas cement kiln co-processing (468.64 kg CO₂-eq/m3) should be reserved for heavily contaminated sites, despite its high carbon intensity. The model demonstrated higher accuracy by accounting for SOC change, a factor often overlooked. This developed LCA model offers a robust tool for quantifying the carbon footprint of site remediation technologies in China. Our findings emphasize the importance of optimizing key emission processes and integrating carbon management into remediation planning to align contamination control with climate goals.