The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Yan Jianhua - One of the best experts on this subject based on the ideXlab platform.
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evolution of pcdd f signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
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Evolution of PCDD/F-signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash.
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
Chen Zhiliang - One of the best experts on this subject based on the ideXlab platform.
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evolution of pcdd f signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
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Evolution of PCDD/F-signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash.
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
Britt-marie Steenari - One of the best experts on this subject based on the ideXlab platform.
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Speciation of Copper in Ash from a Fluidized-Bed Boiler Fired with Municipal Solid Waste
Energy & Fuels, 2013Co-Authors: Henric Lassesson, Britt-marie SteenariAbstract:Copper is one of the most important trace elements in municipal solid waste (MSW) combustion. Knowledge of the speciation of copper is fundamental for the understanding of the effects of copper compounds on the combustion chemistry, the evaluation of the environmental effects of copper in Ash leachates, and the development of methods to recover copper from the MSW combustion Ash. In this work, an investigation of the speciation of copper in four Ash flows from a bubbling fluidized-bed boiler using synchrotron-based X-ray absorption spectrometry is reported. The results showed that copper occurs in oxidation states 0, +1, and +2 in the bed Ash and the cyclone Ash, i.e., 10-20% Cu-0, 25-35% Cu-I, and 50-60% Cu-II, whereas the Filter Ash contained copper only in oxidation state +2. The most common copper compounds in the bed Ash are copper metal, Cu2O, CuO, and mixed oxides, such as CuCr2O4. The cyclone Ash probably contained a mix of copper metal, Cu2O, CuCl, Cu(OH)(2), and CuSO4 center dot 5H(2)O, possibly also CuO. Copper sulfate was found as one of the major species in the Filter Ash together with a mix of hydroxides and chlorides.
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Removal of hazardous metals from MSW fly Ash-An evaluation of Ash leaching methods
Journal of Hazardous Materials, 2009Co-Authors: Karin Karlfeldt Fedje, Christian Ekberg, Gunnar Skarnemark, Britt-marie SteenariAbstract:Incineration is a commonly applied management method for municipal solid waste (MSW). However, significant amounts of potentially hazardous metal species are present in the resulting Ash, and these may be leached into the environment. A common idea for cleaning the Ash is to use enhanced leaching with strong mineral acids. However, due to the alkalinity of the Ash, large amounts of acid are needed and this is a drawback. Therefore, this work was undertaken in order to investigate some alternative leaching media (EDTA, ammonium nitrate, ammonium chloride and a number of organic acids) and to compare them with the usual mineral acids and water. All leaching methods gave a significant increase in Ash specific surface area due to removal of soluble bulk (matrix) compounds, such as CaCO3 and alkali metal chlorides. The use of mineral acids and EDTA mobilised many elements, especially Cu, Zn and Pb, whereas the organic acids generally were not very effective as leaching agents for metals. Leaching using NH4NO3 was especially effective for the release of Cu. The results show that wAshing of MSW Filter Ash with alternative leaching agents is a possible way to remove hazardous metals from MSW fly Ash.
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Release of salts from municipal solid waste combustion residues
Waste management (New York N.Y.), 2003Co-Authors: Z. Abbas, Azadeh Partovi Moghaddam, Britt-marie SteenariAbstract:Abstract Residues from fluidized bed combustion of municipal solid waste were investigated with respect to their leaching behavior and possible extraction of salts. The total water extractable amounts of Na, K, Ca, Cl − , Br − , F − and SO 4 2− along with the total dissolved solids of bottom, hopper, cyclone and bag house Filter Ashes were determined. A simple multistage wAshing process (using water as the extraction medium) was tested in lab scale experiments. The effect of variations in parameters, such as water to Ash weight ratio, contact time, temperature and number of extraction steps was investigated. The leaching behavior of untreated and wAshed cyclone and bag house Filter Ashes was evaluated by a two-step batch-leaching test, i.e. the CEN test. The Ashes investigated in this study can be arranged according to their decreasing water extractable contents and total dissolved solids as follows: Filter Ash > cyclone Ash > hopper Ash > bottom Ash. A triple extraction with water at liquid to solid ratio 2 and extraction time 5 min gave the best results for the extraction of Ca, Na, K, Cl − and SO 4 2− from the cyclone as well as from the Filter Ashes. The leached amounts of salts in the CEN test performed on the wAshed cyclone Ash were considerably lower than the corresponding amounts released from the unwAshed Ash. Thus, the wAshed cyclone Ash was made more stable with respect to salt leachability. On the other hand, large amounts of salts were leached from the wAshed Filter Ashes as well as from unwAshed Filter Ashes. Therefore, it can be concluded that three stage water extraction is not a suitable stabilization method for this type of Filter Ashes.
Wang Yuting - One of the best experts on this subject based on the ideXlab platform.
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evolution of pcdd f signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
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Evolution of PCDD/F-signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash.
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
Qiu Qili - One of the best experts on this subject based on the ideXlab platform.
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evolution of pcdd f signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.
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Evolution of PCDD/F-signatures during mechanochemical degradation in municipal solid waste incineration Filter Ash.
Chemosphere, 2018Co-Authors: Chen Zhiliang, Tang Minghui, Lu Shengyong, Ding Jiamin, Qiu Qili, Wang Yuting, Yan JianhuaAbstract:Mechanochemical degradation (MCD) is employed for the dechlorination of polychlorinated dibenzo-p-dioxins (PCDD) and -furans (PCDF) in Filter Ashes from municipal solid waste incinerators, respectively with the assist of six additive systems. The evolution of PCDD/F-signatures in all eleven samples are systematically monitored and studied at the level of individual congeners, and special attention is paid to CP-route congeners, 2,3,7,8-substitution, 1,9-substitution, and 4,6-PCDF. The PCDD/F-isomers distribution follows an analogous pattern, indicating the similar acting mechanism for all additives: additives transfer electrons to attack the CCl bond and then expulse chlorine. MC dechlorination is not favored for the chlorine on β-position (2,3,7,8-position). The oxygen with stronger electronegativity in PCDD/Fs negatively influences CCl bond to accept donated electrons, hindering the removal of chlorine on 1,9-position for PCDD, and chlroine on 4,6-position for PCDF. Finally, two fair dechlorination pathways for PCDD and PCDF are respectively proposed based on the detailed analysis of CP-route congeners. The evolution of PCDD-signatures is clear, yet obscure for PCDF-signatures, which still requires further investigations.