Dynamics of trace elements release in a coal pyrolysis process☆

Zajusz-Zubek, Elwira; Konieczyński, Jan

doi:10.1016/s0016-2361(03)00031-0

Cited by 55 publications

(32 citation statements)

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“…Previous studies have found that either combustion or pyrolysis of coal and CCA-treated wood would unavoidably produce As volatilization, which is one of the main sources of atmospheric As pollution (16)(17)(18)(19)(20). A large proportion of As was observed to be released below 400°C during the incineration of P. vittata in the study, and the phenomenon was also found in thermal decomposition of CCA-treated wood (18,19,21).…”

Section: Resultsmentioning

confidence: 99%

Arsenic Transformation and Volatilization during Incineration of the Hyperaccumulator Pteris vittata L.

Yan

Chen

Liao

et al. 2008

Environ. Sci. Technol.

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Safe incineration of harvested hyperaccumulators containing high content of heavy metals to avoid secondary environmental pollution is a problem for popularizing phytoremediation technology. The As volatilization behavior and its mechanism during incineration of Pteris vittata, an As-hyperaccumulator, was investigated. Incineration results reveal that 24% of total As accumulated by P. vittata (H-As) containing high As content (1170 mg/kg) is emitted at 800°C, of which 62.5% of the total emitted As is volatilized below 400°C. A study of the extended X-ray absorption fine structure (EXAFS) shows that part of As(III) was identified in the thermal decomposition residue of dried P. vittata (H-As), As 2 O 5 + P. vittata (L-As) containing low As content (14.7 mg/kg), and As 2 O 5 + charcoal (C) at 200°C, suggesting that carbon originating from biomass incineration might catalyze As(V) reduction. This speculation was tested through thermogravimetric experiments, in which either C or P. vittata (L-As) markedly catalyzed the volatilization of pure As 2 O 5 at low temperature. Therefore, the reduction of As(V) to As(III) is responsible for As volatilization during incineration of P. vittata below 400°C. This study provides important insights into As behavior during incineration of As-hyperaccumulators, which is helpful to safely dispose harvested biomass with high As content.

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Section: Resultsmentioning

confidence: 99%

Arsenic Transformation and Volatilization during Incineration of the Hyperaccumulator Pteris vittata L.

Yan

Chen

Liao

et al. 2008

Environ. Sci. Technol.

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“…The methodologies for calculating the average content of Ni in cleaned coals, coke and briquettes can be referred in previous studies (Tian et al, 2010;2011a). We assume 90.25% of Ni contained in a given coal remains in coke after the coking process (Helble et al, 1996;Zajusz-Zubek and Konieczynski, 2003).…”

Section: Nickel Content In Coals and Coal Productsmentioning

confidence: 99%

Anthropogenic atmospheric nickel emissions and its distribution characteristics in China

Tian

Cheng

et al. 2012

Science of The Total Environment

114

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“…The mean volatility is found for Se and the lowest for As. Experimental coking suggested that a coke kept nearly 10%-15% of the total Hg Hong et al, 2002;Zajusz-Zubek et al, 2003;Huang et al, 2004), 60%-65% of the total Se and 70% of the total As (Zajusz-Zubek et al, 2003; China, 1980China, -2007 2004); while the rest escaped into volatile matter. Thus, we assume that 10% of the Hg, 60% of the Se and 70% of the As remains after the coking process.…”

Section: Averaged Content Of Hg As and Se In Raw Coal And Coal Prodmentioning

confidence: 99%

“…The negative effects of Hg, As, and Se on the environment and public health are well-documented in literature (Duker et al, 2005;Zhang and Wong, 2007;Lenz et al, 2009), and have received a wide range of attention throughout the world.…”

Section: Introductionmentioning

confidence: 99%

“…In Sichuan and Guizhou provinces, high atmospheric mercury deposition, both total and wet, due to high emissions from coal combustion is found during fall and winter months (Fang et al, 2009). It is reported that the average gaseous elemental Hg concentration in China is higher than 6 ng/m 3 while the global background range is 1-3 ng/m 3 (Zhang and Wong, 2007;Tayban et al, 2005). Atmospheric Hg contamination in China should receive great attention right now.…”

Section: Introductionmentioning

confidence: 99%

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Trend and characteristics of atmospheric emissions of Hg, As, and Se from coal combustion in China, 1980–2007

et al. 2010

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Abstract. Emissions of hazardous trace elements in China are of great concern because of their negative impacts on local air quality as well as on regional environmental health and ecosystem risks. In this paper, the atmospheric emissions of mercury (Hg), arsenic (As), and selenium (Se) from coal combustion in China for the period 1980-2007 are estimated on the basis of coal consumption data and emission factors, which are specified by different categories of combustion facilities, coal types, and the equipped air pollution control devices configuration (Dust collectors, FGD, etc.). Specifically, multi-year emission inventories of Hg, As, and Se from 30 provinces and 4 economic sectors (thermal power, industry, residential use, and others) are evaluated and analyzed in detail. Furthermore, the gridded distribution of provincialbased Hg, As, and Se emissions in 2005 at a resolution of 1 • × 1 • is also plotted. It shows that the calculated national total atmospheric emissions of Hg, As, and Se from coal combustion have rapidly increased from 73.59 t, 635.57 t, and 639.69 t in 1980 to 305.95 t, 2205.50 t, and 2352.97 t in 2007, at an annually averaged growth rate of 5.4%, 4.7%, and 4.9%, respectively. The industrial sector is the largest source for Hg, As, and Se, accounting for about 50.8%, 61.2%, and 56.2% of the national totals, respectively. The share of power plants is 43.3% for mercury, 24.9% for arsenic, and 33.4% for selenium, respectively. Also, it shows remarkably different regional contribution characteristics of these 3 types of trace elements, the top 5 provinces with the heaviest mercury emissions in 2007 are Shandong (34.40 t), Henan (33.63 t), Shanxi (21.14 t), Guizhou (19.48 t), and Hebei (19.35 , provinces always rank at the top five largest Hg, As, and Se emission sources are: Shandong, Hebei, Shanxi, Henan, and Jiangsu, most of which are located in the east and are traditional industry-based or economically energy intensive areas in China. Notably, Hg, As, and Se emissions from coal combustion in China begin to grow at a more moderate pace since 2005. Emissions from coal-fired power plants sector began to decrease though the coal use had been increasing steadily, which can be mainly attributed to the increasing use of wet flue gas desulfurization (WFGD) in power plants, thus the further research and control orientations of importance for these hazardous trace elements should be the industrial sector.

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Dynamics of trace elements release in a coal pyrolysis process☆

Cited by 55 publications

References 1 publication

Arsenic Transformation and Volatilization during Incineration of the Hyperaccumulator Pteris vittata L.

Arsenic Transformation and Volatilization during Incineration of the Hyperaccumulator Pteris vittata L.

Anthropogenic atmospheric nickel emissions and its distribution characteristics in China

Trend and characteristics of atmospheric emissions of Hg, As, and Se from coal combustion in China, 1980–2007

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