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AuthorShafieiyoun, Saeid
AuthorAl-Raoush, Riyadh I.
AuthorNgueleu, Stephane K.
AuthorRezanezhad, Fereidoun
AuthorVan Cappellen, Philippe
Available date2023-06-04T07:16:33Z
Publication Date2020
Publication NameWater, Air, and Soil Pollution
ResourceScopus
URIhttp://dx.doi.org/10.1007/s11270-020-04725-5
URIhttp://hdl.handle.net/10576/43863
AbstractEngineered sulfate injection has been introduced as an effective technology to enhance the remediation of soil and groundwater contaminated by petroleum hydrocarbons. While some studies indicate that sulfate injection is a promising method for the treatment of hydrocarbon-contaminated subsurface systems, its application in the brackish soil environments is unknown. In this study, we explored related geochemical indicators along with soil adsorption and dissolved phase concentrations to provide an improved understanding of the hydrocarbon-contaminated subsurface responses to the sulfate injection in brackish environments. A series of flow-through experiments representing in situ groundwater anaerobic bioremediation were conducted and two sulfate injection episodes were applied to examine the degradation of dissolved naphthalene under low salinity and brackish conditions. As opposed to the substantial body of previous studies that salinity restricts biodegradation, the results from this study showed that naphthalene anaerobic degradation was more stable once the salinity was as high as that at the sampling location in the coastal brackish environment. While increasing naphthalene concentration from 4 to 12 mg L-1 did not limit biodegradation efficiency under brackish condition similar to the sampling location, it adversely restricted the developed reducing conditions and biodegradation process under low salinity conditions. This highlights the adaption of the microbial communities within the soil to the brackish environment at the sampling location suggesting that changing the salinity during engineered sulfate application can make the remediation process more susceptible against the environmental stresses and substrate toxicity. The results of this study provide insight into the engineered sulfate application as a remediation strategy for potential removal of dissolved naphthalene from the contaminated brackish groundwater. 2020, The Author(s).
SponsorOpen Access funding provided by the Qatar National Library. This study was funded by NPRP grant # NPRP9-93-1-021 from the Qatar national research fund (a member of Qatar Foundation). Acknowledgments The findings achieved herein are solely the responsibility of the authors. We also would like to acknowledge the funding provided by the Canada Excellence Research Chair program in Ecohydrology. We are thankful to Marianne Vandergriendt, Shirley Chatten, Lindsay Norwood, and Jamal Hannun for their valuable assistance during the experiments and sample analyses.
Languageen
PublisherSpringer
SubjectBrackish groundwater
Hydrocarbon-contaminated groundwater
Naphthalene degradation
Sulfate injection
TitleEnhancement of Naphthalene Degradation by a Sequential Sulfate Injection Scenario in a (Semi)-Arid Coastal Soil: a Flow-Through Reactor Experiment
TypeArticle
Issue Number8
Volume Number231
dc.accessType Open Access


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