Synthesis of hexagonal and cubic mesoporous silica using power plant bottom ash

Bottom ash is a part of by-product from the municipal solid waste power plants which is always a wider problem for the urban and rural communities due to its disposal plants may cause serious environmental pollution. This work was focused on the residual heavy metal in an incinerator bottom ash from the municipal waste power plant placed in Nongkham district, Bangkok. Four bottom ash samples were obtained in 2017. After drying and grounding, the bottom ash samples were prepared to clear solution with the microwave digestion technique using nitric, hydrochloric and hydrofluoric acid under the heating program. The total residual heavy metals in the incinerator bottom ashes, such as lead, copper, zinc, and cadmium were determined by using flame atomic absorption spectrophotometer (FAAS) with deuterium background correction. The total concentration of lead, copper, zinc and cadmium were found in the range of 280.40-354.22mg kg-1, 365.35-524.45 mg kg-1, 1,527.25-2,074.34 mg kg-1, and 0.48-1.02 mg kg-1, respectively. The recovery of all metals was found in the range of 89.4-101.2% and the relative standard deviation (RSD) was to be 2.15-3.55 % (n=7). The concentration of zinc, copper, and lead was found high levels, while cadmium was low concentration. Heavy metals in solid waste material occur in different chemical forms and phases. The sample preparation based on the microwave digestion was successfully developed for the waste samples with a good reliability.

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Synthesis and characterization of cerium-modified cubic mesoporous silica

Rare Metals ◽

10.1007/s12598-011-0422-2 ◽

2011 ◽

Vol 30 (5) ◽

pp. 516-521

Author(s):

Wenqing Jiang ◽

Hong Wei ◽

Ganzuo Li

Keyword(s):

Mesoporous Silica ◽

Synthesis And Characterization ◽

Cubic Mesoporous

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Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal

Energies ◽

10.3390/en13195077 ◽

2020 ◽

Vol 13 (19) ◽

pp. 5077 ◽

Cited By ~ 1

Author(s):

Jiseok Lee ◽

Seunghan Yu ◽

Jinje Park ◽

Hyunbin Jo ◽

Jongkeun Park ◽

...

Keyword(s):

Power Plant ◽

Bottom Ash ◽

Flow Characteristics ◽

Electricity Production ◽

Unburned Carbon ◽

Nox Emissions ◽

Wood Pellet ◽

Operating Variables ◽

Carbon Release ◽

Air Staging

For renewable electricity production, biomass can fully displace coal in an existing power plant with some equipment modifications. Recently, a 125 MWe power plant burning mainly anthracite in Korea was retrofitted for dedicated wood pellet combustion with a change of boiler configuration from arch firing to wall firing. However, this boiler suffers from operational problems caused by high unburned carbon (UBC) contents in the bottom ash. This study comprises an investigation of some methods to reduce the UBC release while achieving lower NOx emissions. The computational fluid dynamics approach was established and validated for typical operating data. Subsequently, it was applied to elucidate the particle combustion and flow characteristics leading to the high UBC content and to evaluate the operating variables for improving the boiler performance. It was found that the high UBC content in the bottom ash was a combined effect of the poor fuel grindability and low gas velocity in the wide burner zone originating from the arch-firing boiler. This prevented the operation with deeper air staging for lower NOx emissions. Reducing the particle size to <1.5 mm by modifying mills or pretreating the fuel using torrefaction was the only effective way of lowering the UBC and NOx emissions with deeper air staging while increasing the boiler efficiency.

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Leaching of valuable elements from thermal power plant bottom ash using a thermo–hydrometallurgical process

Waste Management & Research ◽

10.1177/0734242x16633775 ◽

2016 ◽

Vol 34 (6) ◽

pp. 511-517 ◽

Cited By ~ 6

Author(s):

Darinka Bojinova ◽

Ralitsa Teodosieva

Keyword(s):

Power Plant ◽

Thermal Power Plant ◽

Thermal Power ◽

Bottom Ash ◽

Hydrometallurgical Process

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Chemical and petrographical characterization of feed coal, fly ash and bottom ash from the Figueira Power Plant, Paraná, Brazil

International Journal of Coal Geology ◽

10.1016/j.coal.2008.05.005 ◽

2009 ◽

Vol 77 (3-4) ◽

pp. 269-281 ◽

Cited By ~ 61

Author(s):

Janaina Levandowski ◽

Wolfgang Kalkreuth

Keyword(s):

Fly Ash ◽

Power Plant ◽

Coal Fly Ash ◽

Bottom Ash ◽

Feed Coal

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Compressive Strength and Density of Cementless Unfired Lightweight Brick Utilizing Coal Ash from Coal-Fired Thermal Power Plant

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.594-595.527 ◽

2013 ◽

Vol 594-595 ◽

pp. 527-531

Author(s):

Mohamad Ezad Hafez Mohd Pahroraji ◽

Hamidah Mohd Saman ◽

Mohamad Nidzam Rahmat ◽

Kartini Kamaruddin ◽

Ahmad Faiz Abdul Rashid

Keyword(s):

Compressive Strength ◽

Power Plant ◽

Thermal Power Plant ◽

Thermal Power ◽

Bottom Ash ◽

Coal Ash ◽

Hydrated Lime ◽

Raw Material ◽

The World ◽

Blastfurnace Slag

Millions tons of coal ash which constitute of fly ash and bottom ash were produced annually throughout the world. They were significant to be developed as masonry brick to substitute the existing widely used traditional material such as clay and sand brick which were produced from depleting and dwindling natural resources. In the present study, the coal ash from coal-fired thermal power plant was used as the main raw material for the fabrication of cementless unfired lightweight brick. The binder comprising of Hydrated Lime (HL)-activated Ground Granulated Blastfurnace Slag (GGBS) system at binding ratio 30:70, 50:50 and 70:30 were used to stabilize the coal ash in the fabrication process of the brick. Foam was used to lightweight the brick. The compressive strength and ambient density were evaluated on the brick. The results indicated that the brick incorporating HL-GGBS system achieved higher strength of 20.84N/mm2 at 28 days compare to the HL system with strength of 13.98N/mm2 at 28 days. However, as the quantity of foam increase at 0%, 25%, 50%, 75% and 100%, the strength and density for the brick decreased.

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Synthesis of highly dispersed ultra-small cobalt nanoparticles within the cage-type mesopores of 3D cubic mesoporous silica via double agent reduction method for catalytic hydrogen generation

Applied Surface Science ◽

10.1016/j.apsusc.2018.11.171 ◽

2019 ◽

Vol 470 ◽

pp. 764-772 ◽

Cited By ~ 6

Author(s):

Mu-Hsin Lee ◽

Juti Rani Deka ◽

Chun-Jiun Cheng ◽

Ning-Fang Lu ◽

Diganta Saikia ◽

...

Keyword(s):

Mesoporous Silica ◽

Reduction Method ◽

Hydrogen Generation ◽

Cobalt Nanoparticles ◽

Highly Dispersed ◽

Catalytic Hydrogen ◽

Double Agent ◽

Cubic Mesoporous

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MINERALOGY AND ORGANIC MATTER CONTENT OF BOTTOM ASH SAMPLES FROM AGIOS DIMITRIOS POWER PLANT, GREECE

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.16673 ◽

2004 ◽

Vol 36 (1) ◽

pp. 320 ◽

Cited By ~ 5

Author(s):

N. Kantiranis ◽

Α. Georgakopoulos ◽

A. Fiiippidis ◽

A. Drakoulis

Keyword(s):

Organic Matter ◽

Power Plant ◽

Lightweight Concrete ◽

Inorganic Compounds ◽

Amorphous Material ◽

Bottom Ash ◽

Organic Matter Content ◽

Mineralogical Composition ◽

Matter Content ◽

Loss On Ignition

Four bottom ash samples from the Power Units of the Agios Dimitrios Power Plant were studied by the method of PXRD to determine their semi-quantitative mineralogical composition. Their organic matter content was calculated by a wet chemical process. Also, the loss on ignition was measured. The samples are constituted mainly of calcite, quartz and feldspars, while micas, clays, gehlenite and portlandite were determined in a few samples in smaller quantities. The amorphous material varied between 10-43 wt. %, while organic matter varied between 5-42 wt. %. Measurements of the loss on ignition overestimate the unburned lignite contents in the bottom ash samples. The management of bottom ashes with high contents of unburned lignite should differ to that of the fly ashes. The oxidation of the inorganic compounds of the unburned lignite may lead to environmental degradation of the landfill areas. Samples showing lower values of organic matter are suitable for a series of uses, such as: snow and ice control, as an aggregate in lightweight concrete masonry units,as a raw feed material for portland cement, as an aggregate in cold mix emulsified asphalt mixes, base or sub-base courses, or in shoulder construction. Systematic study of the unburned lignite of bottom ashes is needed for possible re-combustion.

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