Life cycle carbon footprint accounting and assessment of risk management and control technologies of typical contaminated sites

ZHANG Jing-yu; ZHOU Ling-li; ZHOU Jing-yan; WU Wen-cheng; WU Ying-xin

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2932-2940.

Environmental Impact Assessment and Management

Life cycle carbon footprint accounting and assessment of risk management and control technologies of typical contaminated sites

ZHANG Jing-yu^1,2, ZHOU Ling-li², ZHOU Jing-yan², WU Wen-cheng², WU Ying-xin²

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Abstract

This study conducted a comprehensive life cycle assessment of the carbon footprint associated with the solidification/stabilization combined with barrier backfilling (SSB) technology through a typical heavy metal-contaminated site case in South China. Using the emission factor method and life cycle impact assessment approach, we quantified the environmental impacts across the entire remediation process. The results revealed that the SSB technology exhibited a carbon emission intensity of 0.190t CO2/m3 contaminated soil. The most important carbon emission unit processes were primary treatment (33.7%), site construction (32.7%), and barrier backfilling (31.9%). Material production emerged as the principal emission source, with concrete manufacturing contributing 51.9% and solidification/stabilization reagents accounting for 33.4% of total emissions. The comprehensive environmental impact score of this case reached 84.3kPt. The implementation process of risk control exerted the most significant human health impacts, which were primarily contributed by the formation of fine particulate matter during construction activities and the global warming potential.

Key words

barrier backfill / carbon footprint / life cycle assessment / solidification/stabilization

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ZHANG Jing-yu, ZHOU Ling-li, ZHOU Jing-yan, WU Wen-cheng, WU Ying-xin. Life cycle carbon footprint accounting and assessment of risk management and control technologies of typical contaminated sites[J]. China Environmental Science. 2025, 45(5): 2932-2940

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