fly ash Articles
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Natural Zeolite Pozzolan Comparison
A recent study published this comparison of clinoptilolite zeolite against silica fume, fly ash, and a non-zeolitic natural pozzolan. The results are very interesting. Clinoptilolite is the most common of natural zeolites. In this study researchers compared this mineral as a natural pozzolan, versus other pozzolanic options, in lime pastes. The results showed that the clinoptilolite possesses a ...
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Prevention of dioxins de novo formation by ethanolamines
Abstract Two inhibitors, triethanolamine (TEA) and monoethanolamine (MEA), were tested for their ability to prevent the de novo formation of polychlorinated dibenzo- p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) on sinter plant fly ash. The amounts of both PCDDs and PCDFs, formed by thermal treatment of the fly ash, decreased when inhibitors were added. Up to 90% reduction of the ...
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Relationships among loss-on-ignition and unburned carbons, and the FTIR photoacoustic spectra of fly ashes
Loss-on-ignition (LOI) and unburned carbon (UC) concentrations of fly ash are two very important indices for evaluating combustion efficiencies of boilers. They are also very important factors affecting the utilisation of fly ashes. The LOI and UC of five fly ash samples collected from different power plants were analysed. The Fourier-transform infrared (FTIR) photoacoustic spectra (PAS) of these ...
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Ammonium, nitrate, and total nitrogen determination in fly ash
Fly ash is a by-product of the combustion of pulverized coal and is composed of small particles. The composition of the fly ash may vary considerably, however, all fly ashes contain substantial amounts of silicon dioxide (SiO2), aluminum oxide (Al2O3) and calcium oxide (CaO). Nowadays, air pollution control standards require a separation of flue gas before being released to the atmosphere. Fly ...
By BUCHI
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Adsorption of 2-methylisoborneol and geosmin by a low-cost hybrid adsorbent synthesized from fly ash and bentonite
This paper describes the synthesis of a low-cost hybrid adsorbent from activation of fly ash and bentonite to remove 2-methylisoborneol (MIB) and geosmin from water. These substances produce objectionable taste and odor problems at levels as low as 4–10 ng/L and an effective, low-cost method of removal would be useful. The effect of the initial pH, contact time and adsorbent dosage on the ...
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Fly ash washing wastewater+ Leachate Concentrate Treatment Project
Application: Fly Ash Washing Wastewater / Leachate Concentrate Scale: 200 tons / day of Fly Ash Washing Wastewater, 600 tons INTRODUCTION Scale: 200 tons / day of fly ash washing wastewater for incineration power plants + 600 tons / day of concentrated leachate Process: DTRO Project time: ...
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Low cost treatment of wastewater containing mercury salts
Removal of mercury from wastewater is of considerable significance from an environmental point of view. Treatment of wastewater containing mercury salts has been carried out with the help of modified fly-ash bed. The preparation of the bed material has been described. The effects of different parameters such as pH, exchange capacity and the presence of other constituents have been studied. ...
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Particle size distribution and dissolution properties of metals in cyclone fly ash
The particles in the examined cyclone fly ash were all smaller than 0.25 mm. in diameter, and particles smaller than 0.075 mm. in diameter accounted for 88.4 % of the ash weight. This result indicates that cyclone fly ash consists of particles with a small diameter. The metals in the cyclone fly ash were enriched in small particles. The highest concentrations for zinc, copper, lead, cadmium and ...
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Sensitivity Comparison of the ISO Daphnia and Algal Test Procedures with Toxkit Microbiotests
Abstract : A short comparative study has been made on the sensitivity of 2 conventional bioassays (the ISO Daphnia magna immobilization test and the ISO algal growth inhibition test with Scenedesmus quadricauda) and 3 Toxkit microbiotests : the Daphtoxkit F™ magna, also with D. magna, the Thamnotoxkit F™ with the crustacean Thamnocephalus platyurus, and the Algaltoxkit F™ assay ...
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Removal of arsenic from drinking water using modified fly-ash bed
The removal of arsenic from drinking water by filtration through modified fly-ash bed is discussed. The preparation and characteristics of the bed material and the effects of different parameters like pH and the presence of other constituents are described. Various arsenic compounds in synthetic mixtures as well as drinking water samples containing arsenic have been investigated. The ...
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Removal of phosphate from coating wastewater using magnetic Fe-Cu bimetal oxide modified fly ash
In this work, magnetic Fe-Cu bimetal oxide modified fly ash was used to remove phosphate from coating wastewater. The influences of pH, dosage amount and adsorption time on the removal of phosphate were investigated. The experimental results showed that pH had a significant effect on the adsorption of phosphate. The removal percentage of phosphate reached a maximum at pH 10. The removal ...
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Biodegradability and methane production from secondary paper and pulp sludge: effect of fly ash and modeling
The effect of fly ash on biodegradability and methane production from secondary paper and pulp sludge, including its modeling, was evaluated. Three tests with fly ash concentrations of 0, 10 and 20 mg/L were evaluated at 32 °C. Methane production was modeled using the modified Gompertz equation. The results show that the doses used produce a statistically significant increase of ...
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Impact assessment of dredging to remove coal fly ash at the tennessee valley authority kingston fossil plant using fathead minnow elutriate exposures
On December 22, 2008, failure of an earthen containment structure resulted in the release of approximately 4.1 million m3 of coal fly ash into the Emory River and the surrounding area from the Tennessee Valley Authority Kingston Fossil Plant near Kingston, Tennessee, USA. The purpose of the present study was to assess the potential of dredging activities performed to remove the fly ash from the ...
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IBA Processing in the United States - Case Study
In the United States, the IBA residue of most Energy-from-Waste facilities is a mix between the bottom ash, boiler ash, and fly ash. Processing this combined ash is more challenging than in any other region we operate. The addition of fly ash in particular causes combined ash to be relatively fine and compact, therefore, making it difficult to process with industry-standard equipment. How we do ...
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Effect of MGO additive on preventing leakage of Cr(VI)
The effect of a new additive, oxide magnesium (MgO), on preventing or reducing the leakage of Cr(VI) from a fly ash (coal ash) has been investigated by batch contact and column percolation tests. The test results indirectly indicate that the MgO additive has an obvious effect on reducing Cr(VI) to Cr(III), which is less environmentally hazardous. However, the process of reducing Cr(VI) to Cr(III) ...
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Phosphorus from Sewage Sludge Ashes - Case Study
Phosphorus recovery from phosphorus-rich asses of SNB and HVC Sewage water in the Netherlands contains approximately 12 million kg of phosphorus of which 85% ends up in sewage sludge. When sewage sludge is burned in a mono-sludge combustor, such as at HVC and SNB, most of the phosphorus ends up in the fly ash. Fly ash contains up to 27% phosphorus. EcoPhos, in cooperation with SNB and HVC, ...
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Global warming, and role of supplementary cementing materials and superplasticisers in reducing greenhouse gas emissions from the manufacturing of portland cement
This paper discusses some aspects of global-warming, and the role of supplementary cementing materials and superplasticisers in reducing greenhouse gas emissions to the atmosphere. The data are presented as to the CO2 emissions per capita per year from various countries. Also, the relative information is given on the availability of cement and supplementary cementing materials worldwide. The ...
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Environmental and human exposure to soil chlorinated and brominated polycyclic aromatic hydrocarbons in an urbanized region
Nine chlorinated and brominated polycyclic aromatic hydrocarbons (Cl/BrPAHs) and five parent polycyclic aromatic hydrocarbons (PAHs) were measured in urban surface soil and fly ash samples collected from Shenzhen, south China in winter 2010. The concentrations of total Cl/BrPAHs and PAHs in soil ranged from below the reporting limit to 142 ng/g and from 4.34 to 158 µg/g, respectively, and in fly ...
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Investigation of a direct melting dehydrated sewage sludge pilot plant
A direct melting dehydrated sewage sludge furnace was tested to obtain the basic operating parameters. Observation of particles (fly ash and deposited particulates) inside the pilot plant was performed to determine the particle properties. The results showed that dehydrated sewage sludge could be directly melted at a temperature of 1400?C with stable combustion. With regard to the fly ash, the ...
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Adsorption of As, B, Cr, Mo and Se from coal fly ash leachate by Fe3+ modified bentonite clay
Fly ash contains the potentially toxic elements As, B, Cr, Mo and Se which upon contact with water may be leached to contaminate surface and subsurface water bodies. This study aims to evaluate the adsorption of these elements from coal fly ash leachates on Fe3+-modified bentonite (Fe-Bent); such modification improved the physicochemical properties of bentonite clay. For optimization of ...
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