Arsenic Partitioning Behavior During Sludge Co-combustion: Thermodynamic Equilibrium Simulation

Liu, Jingyong; Xie, Candie; Xie, Wei; Zhang, Xiaochun; Chang, Ken-Lin; Sun, Jian; Kuo, Jia‐Hong; Xie, Wenhao; Liu, Chao; Sun, Shuiyu; Büyükada, Musa; Evrendilek, Fatih

doi:10.1007/s12649-018-0248-3

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…Although Si as SiO 2 is the highest percentage component in CFA ash samples, the presence of Al as Al 2 O 3 inhibits the effect of the other components on the formation of TEs-bearing species during the combustion process. This result is in line with Liu et al [21] Al 2 O 3 reacted more easily than CaO, Fe 2 O 3 , and SiO 2 and related to the reactivity of the oxides, the order of the reactivity of the oxides with As was thus: Al 2 O 3 > CaO > Fe 2 O 3 > SiO 2 . Roy et al [23] reported that the equilibrium distribution of As during oxy-fuel combustion of three Victorian brown coals at different temperatures, almost all the As was found to present as As 2 O 3(s) , Ca 3 (AsO 4 ) 2(s) , and As 4 O 6(g) .…”

Section: Trace Element Interactions With Coal Fly Ash Componentssupporting

confidence: 91%

“…Barbulescu et al, 2019 [15] It is necessary to understand TEs behavior during the coal combustion and gasification processes. Using the computation method of the thermodynamic equilibrium, lots of research has been studied TEs behavior and transformation during combustion and/or gasification process [16][17][18][19][20][21][22][23]. Liu et al [21] investigated the effects of sewage sludge (SS) co-combustion conditions and interactions with Al 2 O 3 , CaO, Fe 2 O 3 , and SiO 2 .…”

Section: Kaolinementioning

confidence: 99%

“…Using the computation method of the thermodynamic equilibrium, lots of research has been studied TEs behavior and transformation during combustion and/or gasification process [16][17][18][19][20][21][22][23]. Liu et al [21] investigated the effects of sewage sludge (SS) co-combustion conditions and interactions with Al 2 O 3 , CaO, Fe 2 O 3 , and SiO 2 . Their results show that in the SS co-combustion system with the multiple oxides of Al 2 O 3 , CaO, and SiO 2 , As reacted with Al 2 O 3 and CaO to form AlAsO 4(s) and Ca 3 (AsO 4 ) 2(s) which in turn inhibited As volatilization.…”

Section: Kaolinementioning

confidence: 99%

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A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

et al. 2021

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The issues of trace element emissions during coal combustion has been a concern in recent years due to their environmental pollutant. To study the trace element transformation, the thermodynamic calculation (FactSage 7.2) was used. Five kinds of pure mineral oxides (Al2O3, CaO, Fe2O3, K2O, and MgO) and As, B, Cr, F, and Se in fly ash were considered for trace elements. The results confirm that all mineral oxides have a good correlation with arsenic to form Ca3(AsO4)2, FeAsO4, K3AsO4, and Mg3(AsO4)2. Boron has a good relationship with Al, Ca, and Mg to form (Al2O3)9(B2O3)2, Ca3B2O6, and Mg3B2O6. Chromium has a good correlation with K and Ca to form K2CrO4, CaCr2O4. Furthermore, FeF3(s) KF(s), and AlF3(s) are predicted from the interaction of fluorine with Fe2O3, K2O, and Al2O3. The effect of mineral oxides on selenium partitioning are not observed. The inhibition order of trace elements by mineral oxides is as follow: As (Al2O3 > MgO > CaO > Fe2O3 > K2O), B (Al2O3, CaO, Fe2O3, K2O, > MgO), Cr (CaO > K2O > Al2O3, MgO, Fe2O3), F (CaO > MgO > Al2O3 > Fe2O3 > K2O). The results will be useful to control the trace element emissions.

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Section: Trace Element Interactions With Coal Fly Ash Componentssupporting

confidence: 91%

Section: Kaolinementioning

confidence: 99%

Section: Kaolinementioning

confidence: 99%

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A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

et al. 2021

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“…When power plants co-combust sludge with coal, the resultant slag and fly ashes consist mainly of oxides such as SiO 2 , Al 2 O 3 , CaO, Fe 2 O 3 , and P 2 O 5 . Such oxides act as carriers in different forms for the adsorption of As, such as Ca(AsO 3 ) 2 , Ca 3 (AsO 4 ) 2 , and FeAsO 4 [ 42 ]. The As volatilization rules of different chemical forms are different, with 1000 °C as the cut-off point.…”

Section: Resultsmentioning

confidence: 99%

Thermochemical and Toxic Element Behavior during Co-Combustion of Coal and Municipal Sludge

Chen

Gui²,

Xia

et al. 2021

Molecules

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The thermochemical and kinetic behavior of co-combustion of coal, municipal sludge (MS) and their blends at different ratios were investigated by thermogravimetric analysis. Simulation experiments were performed in a vacuum tube furnace to determine the conversion behavior of toxic elements. The results show that the combustion processes of the blends of coal and municipal sludge are divided into three stages and the combustion curves of the blends are located between those of individual coal and municipal sludge samples. The DTGmax of the sample with 10% sludge addition reaches a maximum at the heating rate of 20 °C/min, indicating that the combustion characteristics of coal can be improved during co-combustion. Strong interactions were observed between coal and municipal sludge during the co-combustion. The volatilization rates of toxic elements decrease with an increasing proportion of sludge in the blends during co-combustion, which indicates that the co-combustion of coal and sludge can effectively reduce the volatilization rate of toxic elements. The study reflects the potential of municipal sludge as a blended fuel and the environmental effects of co-combustion of coal and municipal sludge.

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“…The factors affecting the free Gibbs energy included the chemical composition and structure as well as the condensed state (gas, liquid, or solid). A few past studies have used thermodynamic calculations to quantify trace element portioning behavior during the co-combustion and leaching processes, thus providing information about interactions based on a particular condition (e.g., temperature, pressure, and major elements in the sample) [19][20][21][22][23]. Liu et al [20] reported that when developing a sewage sludge co-combustion system with multiple oxides of SiO 2 , Al 2 O 3 , and CaO, As reacted with CaO and Al 2 O 3 to form AlAsO 4(s) and Ca 3 (AsO 4 ) 2(s) , which, in turn, inhibited As volatilization.…”

Section: Introductionmentioning

confidence: 99%

Influence of Blending High-Calcium Additive on Environmental Safety of B, F, and Se: A Case Study from Thermodynamic Calculation

Sutopo,

Desfitri,

Hayakawa

et al. 2024

Environments

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Coal remains an important fuel for use in thermal power plants. However, coal-burning power plants produce large amounts of CFA, which contains TEs such as B, F, and Se, which are leached upon contact with water and act as potential polluters of aquifer systems and soil. To study the transformation of TEs, a thermodynamic calculation (FactSage 7.2) was used. Paper sludge ash was used as a calcium compound additive. The influence of blending a high-calcium additive on the environmental safety of TEs was investigated based on the effect of the mass addition ratio of PS ash. This study’s results confirmed that the leaching processes of TEs, namely (CaO)2(Al2O3), CaF2, Ca10(PO4)F2, and CaSeO4(H2O)2, were caused by the formation of B, F, and Se compounds during the leaching process. Thus, it is clear that calcium has the greatest influence on the transformation of TEs due to their reaction, which, in turn, minimizes the effects of the TEs’ release into the environment. The concentrations of TEs from the sample and addition of PS ash decreased slightly, indicating that the inhibition of TEs was enabled through the addition of PS ash. Although the PS ash YB had the highest calcium content, the PS ash YC gave the best results during the B and Se inhibition processes. The experimental observation was also evaluated for comparison. For the analysis of TEs’ leaching ratios using the thermodynamic calculation and experiment, the experimental results were lower than those initially predicted. These results will help us to choose the best available control technology to minimize the effects of TEs released into the environment.

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Arsenic Partitioning Behavior During Sludge Co-combustion: Thermodynamic Equilibrium Simulation

Cited by 10 publications

References 37 publications

A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

Thermochemical and Toxic Element Behavior during Co-Combustion of Coal and Municipal Sludge

Influence of Blending High-Calcium Additive on Environmental Safety of B, F, and Se: A Case Study from Thermodynamic Calculation

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