Mobilization and retardation of reduced manganese in sandy aquifers: Column experiments, modeling and implications

Goren, Orly; Lazar, Boáz; Burg, Avihu; Gavrieli, Ittai

doi:10.1016/j.gca.2012.06.032

Cited by 21 publications

(4 citation statements)

References 31 publications

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“…Considering the fact that sustaining the shorter DP of SW150 would result in total DO depletion ∼ 175 cm depth (Supplement), these are very important observations. Clearly, too-short DPs will lead to reducing conditions, at some depth, which as a consequence may lead to insufficient degradation of residual DOC, nitrogen species and possible leaching of undesired minerals and compounds, such as manganese to the deep vadose zone and the aquifer (Goren et al, 2012). In addition, the prominent increase in DO in the deeper parts of the profile indicate that a longer DP means not only enhanced oxidizing conditions at a given depth, but also an increase of the profile volume that did not develop anoxic or anaerobic conditions over the flooding and drying cycles.…”

Section: Resultsmentioning

confidence: 99%

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

Moshe

Weisbrod

Barquero

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. Sustainable irrigation with treated wastewater (TWW) is a promising solution for water scarcity in arid and semi-arid regions. Soil aquifer treatment (SAT) provides a solution for both the need for tertiary treatment and seasonal storage of wastewater. Stresses over land use and the need to control the obtained water quality makes the optimization of SAT of great importance. This study looks into the influence of SAT systems' operational dynamics (i.e., flooding and drying periods) as well as some aspects of the inflow biochemical composition on their biogeochemical state and the ultimate outflow quality. A series of four long-column experiments was conducted, aiming to examine the effect of different flooding/drying period ratios on dissolved oxygen (DO) concentrations, oxidation–reduction potential (ORP) and outflow composition. Flooding periods were kept constant at 60 min for all experiments while drying periods (DPs) were 2.5 and 4 times the duration of the flooding periods. Our results show that the longer DPs had a significant advantage over the shorter periods in terms of DO concentrations and ORP in the upper parts of the column as well as in the deeper parts, which indicates that larger volumes of the profile were able to maintain aerobic conditions. DO concentrations in the deeper parts of the column stabilized at ∼3–4 mg L−1 for the longer DPs compared to ∼1–2 mg L−1 for the shorter DPs. This advantage was also evident in outflow composition that showed significantly lower concentrations of NH4+-N, dissolved organic carbon (DOC) and total Kjeldahl nitrogen (TKN) for the longer DPs (∼0.03, ∼1.65 and ∼0.62 mg L−1 respectively) compared to the shorter DPs (∼0.5, ∼4.4 and ∼3.8 mg L−1, respectively). Comparing experimental ORP values in response to different DPs to field measurements obtained in one of the SAT ponds of the SHAFDAN, Israel, we found that despite the large-scale differences between the experimental 1-D system and the field 3-D conditions, ORP trends in response to changes in DP, qualitatively match. We conclude that longer DP not only ensure oxidizing conditions close to the surface, but also enlarge the active (oxidizing) region of the SAT. While those results still need to be verified at full scale, they suggest that SAT can be treated as a pseudo-reactor that to a great extent could be manipulated hydraulically to achieve the desired water quality while increasing the recharge volumes.

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Section: Resultsmentioning

confidence: 99%

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

Moshe

Weisbrod

Barquero

et al. 2020

Hydrol. Earth Syst. Sci.

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show abstract

“…Considering the fact that sustaining the shorter DP of stage 1 (of experiment 2) would result in total DO depletion ∼ 175 cm depth (supplementary material), these are very important observations. Clearly, too short DP will lead to reducing conditions, at some depth, which as a consequence may lead to insufficient degradation of residual DOC, nitrogen species, and possible leaching of undesired minerals and compounds, such as manganese to the deep vadose zone and the aquifer (Goren et al, 2012) . In addition, the prominent increase in DO in the deeper parts of the profile indicate that longer DP means not only enhanced oxidizing conditions at a given depth, but also increase of the profile volume that did not develop anoxic or anaerobic conditions over the flooding and drying cycles.…”

Section: Resultsmentioning

confidence: 99%

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

Moshe¹,

Weisbrod²,

Barquero³

et al. 2019

Preprint

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Abstract. Sustainable irrigation with treated wastewater (TWW) is a promising solution for water scarcity in arid and semi-arid regions. Soil aquifer treatment (SAT) provides a solution for both the need for tertiary treatment and seasonal storage of wastewater. Stresses over land use and the need to control the obtained water quality makes the optimization of SAT of great importance. This study looks into the influence of SAT systems' operational dynamics (i.e. flooding and drying periods) as well as some aspects of the inflow biochemical composition on their bio-geo-chemical state and the ultimate outflow quality. A series of four long-column experiments was conducted, aiming to examine the effect of different flooding/drying period ratios on dissolved oxygen (DO) concentrations, oxidation-reduction potential (ORP) and outflow composition. Flooding periods were kept constant at 60 minutes for all experiments while drying periods (DP) were 2.5 and 4 times the duration of the flooding periods. Our results show that the longer DP had a significant advantage over the shorter periods in terms of DO concentrations and ORP in the upper parts of the column as well as in the deeper parts, which indicates that larger volumes of the profile were able to maintain aerobic conditions. This advantage was evident also in outflow composition analyses that showed significantly lower concentrations of DOC, TKN and ammonium in the outflow for the longer DP. Comparing experimental ORP values in response to different DP to field measurements obtained in one of the SAT ponds of the SHAFDAN, Israel, we found that despite the major scale differences between the experimental 1D system and the field 3D conditions, ORP trends in response to changes in DP, qualitatively match. We conclude that longer DP not only ensure oxidizing conditions close to the surface, but also enlarge the active (oxidizing) region of the SAT. While those results still need to be verified in full scale, they suggest that SAT can be treated as a pseudo-reactor that to a great extent could be manipulated hydraulically to achieve the desired water quality while increasing the recharge volumes.

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“…Although this study focused on stormwater infiltration applications, this geomedia may have other applications, including managed aquifer recharge with municipal wastewater effluent and agricultural runoff. , Manganese oxides may also have applications in advanced wastewater treatment. ,, Manganese and iron oxide-coated sand are already frequently used to remove dissolved metals during drinking water treatment. − The methods described here may lead to geomedia with a longer lifetime that is less expensive to utilize and regenerate.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Chemical Regeneration of Manganese Oxide-Coated Sand for Oxidation of Organic Stormwater Contaminants

Charbonnet

Duan

Genuchten

et al. 2018

Environ. Sci. Technol.

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Urban stormwater, municipal wastewater effluent, and agricultural runoff contain trace amounts of organic contaminants that can compromise water quality. To provide a passive, low-cost means of oxidizing substituted phenols, aromatic amines, and other electron-rich organic compounds during infiltration of contaminated waters, we coated sand with manganese oxide using a new approach involving the room-temperature oxidation of Mn with permanganate. Manganese oxide-coated sand effectively oxidized bisphenol A under typical infiltration conditions and sustained reactivity longer than previously described geomedia. Because geomedia reactivity decreased after extended operation, chlorine was evaluated for use as an in situ geomedia regenerant. Geomedia regenerated by HOCl demonstrated similar reactivity and longevity to that of virgin geomedia. Chemical analyses indicated that the average manganese oxidation state of the coatings decreased as the geomedia passivated. X-ray absorption spectroscopy and X-ray diffraction showed that the reactive virgin and regenerated geomedia coatings had nanocrystalline manganese oxide structures, whereas the failed geomedia coating exhibited greater crystallinity and resembled cryptomelane. These results suggest that it is possible to regenerate the oxidative capacity of manganese oxide-coated sands without excavating stormwater infiltration systems. These results also suggest that manganese oxide geomedia may be a cost-effective means of treating urban stormwater and other contaminated waters.

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Mobilization and retardation of reduced manganese in sandy aquifers: Column experiments, modeling and implications

Cited by 21 publications

References 31 publications

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

Chemical Regeneration of Manganese Oxide-Coated Sand for Oxidation of Organic Stormwater Contaminants

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