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Open AccessArticle

UV Sensitization of Nitrate and Sulfite: A Powerful Tool for Groundwater Remediation

Environmental Technologies, Department of Advanced Materials, Azrieli College of Engineering, Jerusalem 9103501, Israel
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Environments 2018, 5(11), 117; https://doi.org/10.3390/environments5110117
Received: 3 September 2018 / Revised: 23 October 2018 / Accepted: 26 October 2018 / Published: 31 October 2018
Groundwater contamination by nitrate and organic chemicals (for example, 1,4-dioxane) is a growing worldwide concern. This work presents a new approach for simultaneously treating nitrate and 1,4-dioxane, which is based on the ultra-violet (UV) sensitization of nitrate and sulfite, and the production of reactive species. Specifically, water contaminated with nitrate and 1,4-dioxane is irradiated by a UV source (<250 nm) at relatively high doses, to sensitize in situ nitrate and generate OH•. This leads to the oxidation of 1,4-dioxane (and other organics) and the (undesired) production of nitrite as an intermediate. Subsequently, sulfite is added at an optimized time-point, and its UV sensitization produces hydrated electrons that react and reduces nitrite. Our results confirm the effectivity of the proposed treatment: UV irradiation of nitrate (at >5 mg N/L) efficiently degraded 1,4-dioxane, while producing nitrite at levels higher than its maximum contaminant level (MCL) of 1 mg N/L in drinking water. Adding sulfite to the process after 10 min of irradiation reduces the concentration of nitrite without affecting the degradation rate of 1,4-dioxane. The treated water contained elevated levels of sulfate; albeit at much lower concentration than its MCL. Treating water contaminated with nitrate and organic chemicals (often detected concomitantly) typically requires several expensive treatment processes. The proposed approach presents a cost-effective alternative, employing a single system for the treatment of nitrate and organic contaminants. View Full-Text
Keywords: photo-sensitization; nitrate; sulfite; 1,4-dioxane; groundwater photo-sensitization; nitrate; sulfite; 1,4-dioxane; groundwater
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MDPI and ACS Style

Lester, Y.; Dabash, A.; Eghbareya, D. UV Sensitization of Nitrate and Sulfite: A Powerful Tool for Groundwater Remediation. Environments 2018, 5, 117. https://doi.org/10.3390/environments5110117

AMA Style

Lester Y, Dabash A, Eghbareya D. UV Sensitization of Nitrate and Sulfite: A Powerful Tool for Groundwater Remediation. Environments. 2018; 5(11):117. https://doi.org/10.3390/environments5110117

Chicago/Turabian Style

Lester, Yaal; Dabash, Asmaa; Eghbareya, Darine. 2018. "UV Sensitization of Nitrate and Sulfite: A Powerful Tool for Groundwater Remediation" Environments 5, no. 11: 117. https://doi.org/10.3390/environments5110117

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