Effectiveness of hypolimnetic oxygenation for preventing accumulation of Fe and Mn in a drinking water reservoir

Munger, Zackary W.; Carey, Cayelan C.; Gerling, Alexandra B.; Hamre, Kathleen D.; Doubek, Jonathan P.; Klepatzki, Spencer D.; McClure, Ryan P.; Schreiber, Madeline E.

doi:10.1016/j.watres.2016.09.038

Cited by 60 publications

(14 citation statements)

References 28 publications

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“…[1][2][3] Various strategies for adding oxygen directly into water to combat anoxia/hypoxia have been proposed. [4][5][6][7] However, the challenge is finding a safe and cost-effective method to deliver oxygen to anoxic/hypoxic areas, especially in deep waters. Downward pumping of oxygen-rich midwater was suggested as a solution to alleviate severe hypoxia that occurs annually in the Baltic Sea across an average area of 60 × 10 3 km 2 .…”

Section: Introductionmentioning

confidence: 99%

Hypoxia Remediation and Methane Emission Manipulation Using Surface Oxygen Nanobubbles

Shi

Pan

Chen

et al. 2018

Environ. Sci. Technol.

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Algal blooms in eutrophic waters often induce anoxia/hypoxia and enhance methane (CH) emissions to the atmosphere, which may contribute to global warming. At present, there are very few strategies available to combat this problem. In this study, surface oxygen nanobubbles were tested as a novel approach for anoxia/hypoxia remediation and CH emission control. Incubation column experiments were conducted using sediment and water samples taken from Lake Taihu, China. The results indicated that algae-induced anoxia/hypoxia could be reduced or reversed after oxygen nanobubbles were loaded onto zeolite micropores and delivered to anoxic sediment. Cumulated CH emissions were also reduced by a factor of 3.2 compared to the control. This was mainly attributed to the manipulation of microbial processes using the surface oxygen nanobubbles, which potentially served as oxygen suppliers. The created oxygen-enriched environment simultaneously decreased methanogen but increased methanotroph abundances, making a greater fraction of organic carbon recycled as carbon dioxide (CO) instead of CH. The CH/CO emission ratio decreased to 3.4 × 10 in the presence of oxygen nanobubbles, compared to 11 × 10 in the control, and therefore the global warming potential was reduced. This study proposes a possible strategy for anoxia/hypoxia remediation and CH emission control in algal bloom waters, which may benefit global warming mitigation.

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Section: Introductionmentioning

confidence: 99%

Hypoxia Remediation and Methane Emission Manipulation Using Surface Oxygen Nanobubbles

Shi

Pan

Chen

et al. 2018

Environ. Sci. Technol.

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“…At most, it may only migrate from the water into the surface sediment. Fe and Mn in sediments showed an increasing trend, indicating that they were oxidized into a stable state by sufficient DO in the water column and then deposited onto the surface sediment [40]. OC in sediment showed a slightly decreasing trend from 3.21% ± 0.32% to 3.01% ± 0.18%.…”

Section: The Fate Of Pollutantsmentioning

confidence: 96%

Water Quality Responses during the Continuous Mixing Process and Informed Management of a Stratified Drinking Water Reservoir

Zhou

Gong

et al. 2019

Sustainability

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Aeration and mixing have been proven as effective in situ water quality improvement methods, particularly for deep drinking water reservoirs. While there is some research on the mechanism of water quality improvement during artificial mixing, the changes to water quality and the microbial community during the subsequent continuous mixing process is little understood. In this study, we investigate the mechanism of water quality improvement during the continuous mixing process in a drinking water reservoir. During this period, we found a reduction in total nitrogen (TN), total phosphorus (TP), ammonium-nitrogen (NH4-N), iron (Fe), manganese (Mn), and total organic carbon (TOC) of 12.5%–30.8%. We also measured reductions of 8.6% and 6.2% in TN and organic carbon (OC), respectively, in surface sediment. Microbial metabolic activity, abundance, and carbon source utilization were also improved. Redundancy analysis indicated that temperature and dissolved oxygen (DO) were key factors affecting changes in the microbial community. With intervention, the water temperature during continuous mixing was 15 °C, and the mixing temperature in the reservoir increased by 5 °C compared with natural mixing. Our research shows that integrating and optimizing the artificial and continuous mixing processes influences energy savings. This research provides a theoretical basis for further advancing treatment optimizations for a drinking water supply.

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“…After that, the tubes were divided evenly into two polythene barrels (45 cm high), filled with overlying water, pre-cultured in a constant temperature (22 C) cultivation system at least 16 days to stabilization. Three sediment tubes in one barrel were connected with aerobic devices, where air was introduced at a flow rate of 0.8 L/min to provide continuous aerobic conditions (the concentration of DO > 2 mg/L (Munger et al 2016)) (aerobic group), while the other three were placed in a barrel without aerobic conditions (control group).…”

Section: Experimental Designmentioning

confidence: 99%

Effects Of Short-Term Aerobic Conditions On Phosphorus Mobility In Sediments

Yan

Liu

et al. 2019

Journal of Freshwater Ecology

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In this study, the effects of short-term aerobic conditions on phosphorus (P) mobility in sediment were investigated in the eutrophic lakes. To accomplish this, an indoor cultivation system was established and short-term cultivation (3, 8 and 15 days) was conducted under control and aerobic treatments. High-resolution diffusive gradients in thin films (DGT) and dialysis (HR-Peeper) techniques were used to determine the mobility patterns of P in sediments. The results showed that: (1) Aerobic treatment significantly increased oxygen concentrations (maximum 17.1%) in overlying water within 15 days, with no significant effects on sediment oxygen penetration depth or redox potential. Additionally, aerobic treatment inhibited soluble reactive phosphorus (SRP) and DGT-labile P release from sediment to overlying water. (2) Aerobic treatment decreased the pore water SRP and soluble Fe(II) on day 3 with no impact on sediment SRP/DGT-labile P and soluble/DGT-labile Fe on day 8 and 15.(3) Model simulation using DGT Induced Fluxes in Sediments (DIFS) showed that the pore water SRP replenishment ability of sediment particle P was lower in the aerobic group than the control group, and the sediment system equilibration time was elongated after pore water SRP decreased in the aerobic group on day 3. (4) On day 3, SRP and soluble Fe(II), DGT-labile P and DGT-labile Fe showed significant positive correlations (r > 0.888, p < 0.001), indicating that reduced pore water SRP concentration was related to decreased pore water soluble Fe(II).

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Effectiveness of hypolimnetic oxygenation for preventing accumulation of Fe and Mn in a drinking water reservoir

Cited by 60 publications

References 28 publications

Hypoxia Remediation and Methane Emission Manipulation Using Surface Oxygen Nanobubbles

Hypoxia Remediation and Methane Emission Manipulation Using Surface Oxygen Nanobubbles

Water Quality Responses during the Continuous Mixing Process and Informed Management of a Stratified Drinking Water Reservoir

Effects Of Short-Term Aerobic Conditions On Phosphorus Mobility In Sediments

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