Abstract: Under the background of the national "dual carbon" strategy, the evaluation of the green-sustainability level of bio-pile remediation technology is more important. Based on the life cycle assessment (LCA) software eFootprint and a practical engineering case of bio-pile remediation at a coking contaminated site, the green-sustainability level of bio-pile technology is evaluated from environmental impact. The results indicate that the overall green-sustainability level of bio-pile on coke-contaminated soil is high. The environment-impact values of human toxicity (HT), water use (WU), ecotoxicity (ET), global warming potential (GWP), respiratory inorganics (RI) and abiotic depletion potential (ADP), acidification (AP), primary energy demand (PED), competition-land use (CLU) and eutrophication potential (EP) are relatively higher and their difference is not significant (contribution ratio is 94.90% -100%), whereas that of ozone depletion potential (ODP) is relatively lower (contribution ratio is 68.53%). The main material factors that cause major environmental impacts (HT, WU, ET, GWP, RI, ADP) and reduce its green sustainability are input air volume, CO₂ volume produced, urea dose, and flower power consumption. To further enhance the green sustainability of soil bioremediation technology, measures can be taken such as selecting coke-contaminated soil with comprehensive nutrition and moisture content greater than 10%, optimizing the minimum air-flow volume design, and selecting appropriate flower type to ensure lower power output. The results of this paper can provide some theoretical basis and technical reference for the improvement of green sustainability of bioremediation technology of organic contaminated soil.

Key words: coke-contaminated soil, bio-pile remediation, life cycle assessment, green sustainability, environmental impact