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Comparing performances, costs and energy balance of ex situ remediation processes for PAH-contaminated marine sediments

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Abstract

This study proposes a comparison of different ex situ technologies aimed at the removal of polycyclic aromatic hydrocarbons from marine sediments in terms of performances, costs and energy balance. In accordance with the principles of water-energy nexus, anaerobic bioremediation, soil washing and thermal desorption were investigated under low liquid phase and temperature conditions using phenanthrene (PHE) as model compound. After 42 days of anaerobic bioremediation, the highest PHE biodegradation of 68 and 64% was observed under denitrifying and methanogenic conditions, respectively, accompanied by N2 and CH4 production and volatile fatty acid accumulation. During soil washing, more than 97% of PHE was removed after 60 min using a solid-to-liquid ratio of 1:3. Along the same treatment time, low-temperature thermal desorption (LTTD) allowed a PHE removal of 88% at 200 °C. The economic analysis indicated that LTTD resulted in a higher cost (i.e. 1782 € m−3) than bioremediation and soil washing (228 and 371 € m−3, respectively). The energy balance also suggested that bioremediation and soil washing are more sustainable technologies as a lower required energy (i.e. 16 and 14 kWh m−3, respectively) than LTTD (i.e. 417 kWh m−3) is needed.

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Funding

The Italian Ministry of Education, University and Research (MIUR) and the Erasmus Mundus Joint Doctorate Program ETeCoS3 (Environmental Technologies for Contaminated Solids, Soils, and Sediments) [grant agreement FPA number 2010-0009] co-funded this research.

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Correspondence to Francesco Bianco.

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Responsible editor: Bingcai Pan

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Bianco, F., Monteverde, G., Race, M. et al. Comparing performances, costs and energy balance of ex situ remediation processes for PAH-contaminated marine sediments. Environ Sci Pollut Res 27, 19363–19374 (2020). https://doi.org/10.1007/s11356-020-08379-y

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  • DOI: https://doi.org/10.1007/s11356-020-08379-y

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