Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 17, Pages 21045-21064Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-13260-7
Keywords
Denitrification; Permeable reactive barriers; Nitrates; Organic substrate; Zero-valent iron
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Funding
- Liaoning Provincial Scholarship for International Postgraduates
- Natural Science Foundation of China [41672248]
- Natural Science Foundation of Liaoning Province [20180550040]
- Liaoning Distinguished Professorship Program [Liaojiaohan (2018)-35]
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This review paper analyzed the performance and mechanisms of two major PRB approaches for groundwater denitrification over the past 10 years using laboratory, modeling, and field-scale approaches. Important factors affecting denitrification efficiencies were discussed, and research gaps were identified for further investigation.
Nitrate as a diffusive agricultural contaminant has been causing substantial groundwater quality deterioration worldwide. In situ groundwater remediation techniques using permeable reactive barriers (PRBs) have attracted increasing interest. Particularly, PRBs based on biological denitrification, using the organic substrate as a biostimulator, and chemical nitrate reduction, using zero-valent iron (ZVI) as a reductant, are two major PRB approaches for groundwater denitrification. This review paper analyzed the published studies over the past 10 years (2010-2020) using laboratory, modeling, and field-scale approaches to explore the performance and mechanisms of these two types of PRBs. Important factors affecting the denitrification efficiencies as well as the influential mechanisms were discussed. Several research gaps have been identified and further research needs are discussed in the end.
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