Controlling soluble iron and manganese in a water-supply reservoir using hypolimnetic oxygenation

Gantzer, Paul A.; Bryant, Lee D.; Little, John C.

doi:10.1016/j.watres.2008.12.019

Cited by 111 publications

(85 citation statements)

References 26 publications

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“…Iron in particular was rapidly lost from the water column. This has been observed in other lakes in which oxygen has been added to an iron-rich anaerobic hypolimnia (Gantzer et al 2009b). Potential loss mechanisms for phosphate from the water column after oxygenation include sorption to iron oxides in the water column and subsequent deposition; repressed phosphate release from oxidized surfacial sediments; and enhanced uptake of phosphate from the water column to fresh iron oxides in surfacial sediments.…”

Section: Impacts Of Hypolimnetic Oxygenation System On Water Qualitysupporting

confidence: 56%

“…Typical half-lives of reduced manganese in oxygenated waters are on the order of years, while half-lives of reduced iron are on the order of minutes to hours (Davison 1993, Wehrli et al 1995. A number of studies have observed that once released into the water column, manganese is resistant to oxidation via lake oxygenation (Gantzer et al 2009b, Bryant et al 2011. Observations in the lake contrasted with those in oxic sediment-water chambers which showed a net loss of manganese over the course of the experimental incubations (Table 2; Fig.…”

Section: Impacts Of Hypolimnetic Oxygenation System On Water Qualitymentioning

confidence: 99%

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Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Debroux¹,

Beutel

Thompson³

et al. 2012

Lake and Reservoir Management

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Section: Impacts Of Hypolimnetic Oxygenation System On Water Qualitysupporting

confidence: 56%

Section: Impacts Of Hypolimnetic Oxygenation System On Water Qualitymentioning

confidence: 99%

Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Debroux¹,

Beutel

Thompson³

et al. 2012

Lake and Reservoir Management

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“…The majority of the studies on the limnology as well as heavy-metal accumulation and management in reservoirs has been carried out in the lacustrine zone, mainly near the dam (e.g., Kamman et al, 2005;Gantzer et al, 2009), since the features of this region are usually very important for energy generation and water supply. The impact of the outflow of pollutants from reservoirs on the downstream region and especially on the biota is not well known.…”

Section: Introductionmentioning

confidence: 99%

Evidence of elevated mercury levels in carnivorous and omnivorous fishes downstream from an Amazon reservoir

et al. 2012

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Hydroelectric reservoirs can stratify, producing favorable conditions for mercury methylation in the hypolimnion. The methylmercury (MeHg) can be exported downstream, increasing its bioavailability below the dam. Our objective was to assess the mercury levels in plankton, suspended particulate matter (SPM) and fish collected upstream (UP) and downstream (DW) from the Reservatório de Samuel dam, an Amazonian reservoir that stratifies during half of the year. Mercury concentrations in both SPM and plankton were similar between the two sites, which could indicate there are no conditions favoring methylation at the moment of sampling (absence of stratification). Almost all mercury found in the muscle of fishes was in organic form, and differences of mercury levels between sites were dependent on the fishes trophic level. Herbivores showed similar mean organic mercury levels (UP = 117 lg g -1 ; DW = 120 lg g -1 ; n = 12), whereas omnivores (UP = 142 lg g -1 ; DW = 534 lg g -1 ; n = 27) and carnivores (UP = 545 lg g -1 ; DW = 1,366 lg g -1 ; n = 69) showed significantly higher values below the dam. The absence of a reservoir effect in herbivores is expected, since they feed on grassy vegetation, near the riverbanks, which is not much influenced by mercury in aquatic systems. On the other hand, the higher mercury levels below the dam observed for omnivores and carnivores suggest a possible influence of the reservoir since they feed on items that could be contaminated by MeHg exported from upstream. The results highlight the necessity of assessing areas downstream of reservoirs.

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“…Both elements act to render phosphate inactive, in this way limiting processes of eutrophication [Bartoszek and Tomaszek 2011]. The effect is highly dependent on the oxidation and reduction of the coupled pairs Fe(II)/Fe(III) and Mn(II)/Mn(IV), which result either in precipitation or dissolution -commonly with phosphate [Gantzer et al 2009, Naeher et al 2013, Dunalska et al 2015. A further connected result may be intensification of the processes by which autochthonous organic matter is first produced and then decomposes, and the latter process may in turn give rise to oxygen deficits in the near-bottom zone.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sedimentary Fe and Mn on the Oxygenation of Overlying Waters in Dam Reservoirs

Koszelnik¹,

Bartoszek²

2018

J. Ecol. Eng.

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This paper reports the work to determine the impact that concentrations of manganese (Mn) and iron (Fe) in the bottom sediments of shallow dam reservoirs exert upon the dissolved oxygen concentrations of overlying waters. Specifically, the work was conducted in the period of 2013-2014 in six shallow artificial reservoirs located in SE Poland. The waters of all the reservoirs studied are relatively well oxygenated, though both supersaturation and anoxic conditions are observed seasonally across the 50-150% range. The reported reactions of bottom sediments were between pH 7.7 and 8.2, while the mean concentrations of Mn and Fe were found to vary widely from site to site (Mn from 0.068 to 1.48 g/kg d.w. and Fe from 2.48 to 24.0 g/kg d.w.). It was not possible to demonstrate any direct relationship between sediment Fe and Mn concentrations, the Mn/Fe ratio or pH on the one hand and the oxygenation of reservoir waters on the other. However, multiple regression analysis did allow for the identification of a significant influence of both Mn content and sediment pH on the oxygen concentration in reservoir waters. In simple terms, both an increase in Mn and a decrease in pH can be said to result in more fully aerobic conditions in waters.

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Controlling soluble iron and manganese in a water-supply reservoir using hypolimnetic oxygenation

Cited by 111 publications

References 26 publications

Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Evidence of elevated mercury levels in carnivorous and omnivorous fishes downstream from an Amazon reservoir

Influence of Sedimentary Fe and Mn on the Oxygenation of Overlying Waters in Dam Reservoirs

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