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LCA of heavy metals leaching from landfilled sewage sludge ash

    Domagoj Nakić Affiliation
    ; Dražen Vouk Affiliation
    ; Mario Šiljeg Affiliation
    ; Anđelina Bubalo Affiliation

Abstract

Quantities of sewage sludge that are thermally treated (mostly incinerated) are increasing, resulting in growing quantities of sewage sludge ash (SSA) which also requires further management. Despite its potential as a resource, it is still largely landfilled. Considering the presence of potentially toxic and hazardous heavy metals in SSA, this paper analyzes how the change in the leaching concentrations of the selected heavy metals from landfilled SSA impacts the environment (air, water, and soil) by the means of LCA. When considering human toxicity potential as impact category, dominant impacts were due to emissions into the air, primarily caused by leaching of selenium and somewhat less cadmium, mercury and nickel. Mercury had a dominant impact when considering the terrestrial ecotoxicity potential impact. In the SSAs obtained from Croatian sludge, molybdenum leaching, along with selenium and mercury, showed a dominant impact. Therefore, due to the high variability of trace elements, detailed analysis of different SSAs is needed.

Keyword : heavy metals, landfills, LCA, leaching, sewage sludge ash

How to Cite
Nakić, D., Vouk, D., Šiljeg, M., & Bubalo, A. (2021). LCA of heavy metals leaching from landfilled sewage sludge ash. Journal of Environmental Engineering and Landscape Management, 29(3), 359-367. https://doi.org/10.3846/jeelm.2021.15594
Published in Issue
Oct 25, 2021
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This work is licensed under a Creative Commons Attribution 4.0 International License.

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