Enhanced mercury control for coal-fired utility boilers

Kudlac, G.A.; Amrhein, G.T.

doi:10.1016/s0140-6701(02)86384-6

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“…The United States Environmental Protection Agency (USEPA) and Electric Power Research Institute (EPRI) estimate that coal-fired utility commercial boilers emit 50−55 tons of total mercury per year in the U.S . The scrubber waters consist of approximately 0.5 mg/L (500 μg/L) mercury(II) at a pH near 5. , The permitted discharge limit of wastewater for total mercury is 10 μg/L, and the EPA water-drinking limit is 2 μg/L . An environmentally sound and cost-effective mercury control technology is required to meet and exceed these limits.…”

Section: Introductionmentioning

confidence: 99%

Mercury(II) Adsorption from Wastewaters Using a Thiol Functional Adsorbent

Nam

Gómez-Salazar

Tavlarides

2003

Ind. Eng. Chem. Res.

111

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The removal of mercury(II) from wastewaters (coal-fired utility plant scrubber solutions) using a thiol functional organoceramic composite (SOL-AD-IV) is investigated. A simulant is employed as a surrogate to demonstrate the removal of mercury from real waste solutions. Equilibrium studies show a mercury uptake capacity of 500 mg/g at a low mercury concentration of 0.5 mg/L and 726 mg/g at saturation. Adsorption is observed to be independent in the pH range 3-5. The kinetic performance assessed on a recycle batch reactor shows a rapid rate of adsorption. Selectivity is found to be in the order Hg(II) > Pb(II) ∼ Cd(II) > As(V) > Cr(III). Regeneration of SOL-AD-IV is accomplished using 12 M HCl. Effluent mercury concentrations of <0.001 mg/L are achieved using a fixed-bed adsorption column. A stability test operated for 25 cycles indicates a capacity loss of <10%. A high potential is demonstrated for application for mercury cleanup of wastewaters.

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Section: Introductionmentioning

confidence: 99%

Mercury(II) Adsorption from Wastewaters Using a Thiol Functional Adsorbent

Nam

Gómez-Salazar

Tavlarides

2003

Ind. Eng. Chem. Res.

111

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“…The major anthropogenic sources basically include industrial waste, mining, pharmaceutical and pesticide products, and processing and refining of mercury ores. 2 For example, the United States Environmental Protection Agency (US-EPA) estimates that coal-fired utility commercial boilers emit 50À55 tons of total mercury per year in the U.S. 3 Hg(II) constitutes the majority of mercury in the hydrosphere and is the predominant form in aqueous phase. Most of the remediation technologies available today, which are based on the adsorption, 4À6 ion exchange, 3,7,8 amalgamation, 9,10 or chemical precipitation 11 of mercury, while effective, very often are costly and time-consuming, particularly pump-and-treat methods that require costly investments and procedures.…”

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confidence: 99%

“…2 For example, the United States Environmental Protection Agency (US-EPA) estimates that coal-fired utility commercial boilers emit 50À55 tons of total mercury per year in the U.S. 3 Hg(II) constitutes the majority of mercury in the hydrosphere and is the predominant form in aqueous phase. Most of the remediation technologies available today, which are based on the adsorption, 4À6 ion exchange, 3,7,8 amalgamation, 9,10 or chemical precipitation 11 of mercury, while effective, very often are costly and time-consuming, particularly pump-and-treat methods that require costly investments and procedures. Some additional challenges are the ability to remove in situ toxic compounds from subsurface and other environments that are difficult to access and the capacity to clean extremely low concentrations of pollutants but still under the threshold of safety.…”

mentioning

confidence: 99%

“…The major anthropogenic sources basically include industrial waste, mining, pharmaceutical and pesticide products, and processing and refining of mercury ores . For example, the United States Environmental Protection Agency (US-EPA) estimates that coal-fired utility commercial boilers emit 50–55 tons of total mercury per year in the U.S . Hg(II) constitutes the majority of mercury in the hydrosphere and is the predominant form in aqueous phase.…”

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confidence: 99%

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Citrate-Coated Gold Nanoparticles As Smart Scavengers for Mercury(II) Removal from Polluted Waters

et al. 2012

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Colloidal gold nanoparticles (Au NPs) have been employed as single entities for rapid scanning and sequestration of Hg(II) from multicomponent aqueous solutions containing low pollutant concentrations. Under the studied conditions, sodium citrate has been identified as the reducing agent and Au NPs as the catalyst in the reduction of Hg(II), which is efficiently trapped in the presence of other cations such as Cu(II) and Fe(III). The effect of Hg(II) uptake implies amalgam formation, which leads to remarkable morphological transformations. The hydrophobicity of the resulting amalgam and consequent expulsion from water eases its recovery. The interaction between Au and Hg has been studied using UV-vis, ICP-MS, (S)TEM, SEM, EDX, and XRD.

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Enhanced mercury control for coal-fired utility boilers

Cited by 1 publication

References 0 publications

Mercury(II) Adsorption from Wastewaters Using a Thiol Functional Adsorbent

Mercury(II) Adsorption from Wastewaters Using a Thiol Functional Adsorbent

Citrate-Coated Gold Nanoparticles As Smart Scavengers for Mercury(II) Removal from Polluted Waters

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