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Article

Application of 2H and 18O Isotopes for Tracing Municipal Solid Waste Landfill Contamination of Groundwater: Two Italian Case Histories

1
Department of Civil Building and Environmental Engineering (DICEA), Sapienza University of Rome, 00184 Rome, Italy
2
Department of Earth Sciences (DST), Sapienza University of Rome, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Giorgio Mannina
Water 2021, 13(8), 1065; https://doi.org/10.3390/w13081065
Received: 3 March 2021 / Revised: 2 April 2021 / Accepted: 9 April 2021 / Published: 13 April 2021
Groundwater contamination due to municipal solid waste landfills leachate is a serious environmental threat. During recent years, the use of stable isotopes as environmental tracers to identify groundwater contamination phenomena has found application to environmental engineering. Deuterium (2H) and oxygen (18O) isotopes have successfully used to identify groundwater contamination phenomena if submitted to interactions with municipal solid waste landfills leachate, with a significant organic amount. The paper shows two case studies, in central and southern Italy, where potential contamination phenomenon of groundwater under municipal solid waste landfills occurred. In both cases, isotope compositions referred to 2H and 18O highlight a δ2H enrichment for some groundwater samples taken in wells, located near leachate storage wells. The δ2H enrichment is probably caused by methanogenesis phenomena, during which the bacteria use preferentially the hydrogen “lighter” isotope (1H), and the remaining enriched the “heavier” isotope (2H). The study of the isotope composition variation, combined with the spatial trend of some analytes (Fe, Mn, Ni) concentrations, allowed to identify interaction phenomena between the municipal solid waste landfills leachate and groundwater in both case histories. Therefore, these results confirm the effectiveness of 2H isotopes application as environmental tracer of groundwater contamination phenomena due to mixing with municipal solid waste landfills leachate. View Full-Text
Keywords: environmental isotope; δ2H; municipal solid waste; leachate contamination; natural tracers environmental isotope; δ2H; municipal solid waste; leachate contamination; natural tracers
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MDPI and ACS Style

Andrei, F.; Barbieri, M.; Sappa, G. Application of 2H and 18O Isotopes for Tracing Municipal Solid Waste Landfill Contamination of Groundwater: Two Italian Case Histories. Water 2021, 13, 1065. https://doi.org/10.3390/w13081065

AMA Style

Andrei F, Barbieri M, Sappa G. Application of 2H and 18O Isotopes for Tracing Municipal Solid Waste Landfill Contamination of Groundwater: Two Italian Case Histories. Water. 2021; 13(8):1065. https://doi.org/10.3390/w13081065

Chicago/Turabian Style

Andrei, Francesca, Maurizio Barbieri, and Giuseppe Sappa. 2021. "Application of 2H and 18O Isotopes for Tracing Municipal Solid Waste Landfill Contamination of Groundwater: Two Italian Case Histories" Water 13, no. 8: 1065. https://doi.org/10.3390/w13081065

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