The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Perng-jy Tsai - One of the best experts on this subject based on the ideXlab platform.
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reducing polychlorinated dibenzo p dioxins and dibenzofurans pcdd f emissions from a real scale iron ore Sinter Plant by adjusting its Sinter raw mix
Journal of Cleaner Production, 2016Co-Authors: Yucheng Chen, Ying Fang Wang, Mei-ru Chen, Ching-hwa Chen, Chungsik Yoon, Perng-jy TsaiAbstract:Abstract This study was conducted in a real-scale iron ore Sinter Plant for reducing emissions of polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) from the iron ore Sintering process via the adjustment of its Sinter raw mix. Based on operating condition of the selected Plant, four experimental campaigns of C ref (currently used raw mix, served as the reference), C H (modified from C ref , with a 15% increase in hematite but 15% decrease in limonite), C H,EP (modified from C H, without electrostatic precipitator (EP) and blast furnace (BF) flue dusts), and C H,EP,W (modified from C H,EP, with a 0.5 wt% increase in water content) were chosen. For each experimental campaign, three replicate samples of PCDD/Fs were collected from the flue gases, and the Sinter productivity and Sinter strength were measured simultaneously. In comparison with C ref , the most significant reductions in PCDD/F and I-TEQ emissions was found in C H,EP (=68% and 76%, respectively), and the main reduction was found in PCDFs (54–76% decrease). C H could reduce emissions of PCDD/Fs and I-TEQ by 47% and 51%, respectively. But the addition of water contents (i.e., C H,EP,W ) did not result in further reductions. Since Sinter productivity and Sinter strength of all experimental campaigns were quite similar, C H,EP could be a promising raw mix for reducing PCDD/F emissions from the Sintering process.
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Reducing polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) emissions from a real-scale iron ore Sinter Plant by adjusting its Sinter raw mix
Journal of Cleaner Production, 2016Co-Authors: Yucheng Chen, Ying Fang Wang, Mei-ru Chen, Ching-hwa Chen, Chungsik Yoon, Perng-jy TsaiAbstract:Abstract This study was conducted in a real-scale iron ore Sinter Plant for reducing emissions of polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) from the iron ore Sintering process via the adjustment of its Sinter raw mix. Based on operating condition of the selected Plant, four experimental campaigns of C ref (currently used raw mix, served as the reference), C H (modified from C ref , with a 15% increase in hematite but 15% decrease in limonite), C H,EP (modified from C H, without electrostatic precipitator (EP) and blast furnace (BF) flue dusts), and C H,EP,W (modified from C H,EP, with a 0.5 wt% increase in water content) were chosen. For each experimental campaign, three replicate samples of PCDD/Fs were collected from the flue gases, and the Sinter productivity and Sinter strength were measured simultaneously. In comparison with C ref , the most significant reductions in PCDD/F and I-TEQ emissions was found in C H,EP (=68% and 76%, respectively), and the main reduction was found in PCDFs (54–76% decrease). C H could reduce emissions of PCDD/Fs and I-TEQ by 47% and 51%, respectively. But the addition of water contents (i.e., C H,EP,W ) did not result in further reductions. Since Sinter productivity and Sinter strength of all experimental campaigns were quite similar, C H,EP could be a promising raw mix for reducing PCDD/F emissions from the Sintering process.
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Correcting the gas and particle partitioning of PCDD/F congeners in the flue gas of an iron ore Sinter Plant.
Journal of hazardous materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Linchi Wang, Perng-jy Tsai, Guo-ping Chang-chienAbstract:This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP(ash)) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were -58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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Characterization of PAHs exposure in workplace atmospheres of a Sinter Plant and health-risk assessment for Sintering workers.
Journal of hazardous materials, 2008Co-Authors: Yuan-chung Lin, Guo-ping Chang-chien, Wen-jhy Lee, Shui-jen Chen, Perng-jy TsaiAbstract:This study first measured concentrations of polycyclic aromatic hydrocarbons (PAHs) in four selected workplace atmospheres, including the raw materials inlet, Sintering grate, rough roll shredder and control room, and the outdoor environment of a Sinter Plant. Then, PAHs exposures and their resultant health-risks were assessed for Sintering workers. We found that total PAH concentrations of the three selected Sintering process areas were higher than that of the control room. The above results could be explained by the filtration effect of the air conditioning device installed inside the control room. PAH homologue distributions of the three selected Sintering process areas were significantly different from that of the outdoor environment suggesting that PAHs found in the Sintering workplace atmospheres were mainly contributed by process fugitives. Total PAH exposure levels were lower than the current permissible exposure limits, thus revealing that Sintering workers are not a high risk group for long-term effects attributable to PAHs. Moreover, the lung cancer risks associated with the above PAH exposures were lower than the significant risk level defined by US Supreme Court further confirming that their exposures could be acceptable at this stage.
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exposure and health risk assessment of polychlorinated dibenzo p dioxins and dibenzofurans pcdd fs for Sinter Plant workers
Environment International, 2008Co-Authors: Tung Sheng Shih, Linchi Wang, Guoping Changchien, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
Guoping Changchien - One of the best experts on this subject based on the ideXlab platform.
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correcting the gas and particle partitioning of pcdd f congeners in the flue gas of an iron ore Sinter Plant
Journal of Hazardous Materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Pengchi Tsai, Linchi Wang, Guoping ChangchienAbstract:Abstract This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP ash ) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were −58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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exposure and health risk assessment of polychlorinated dibenzo p dioxins and dibenzofurans pcdd fs for Sinter Plant workers
Environment International, 2008Co-Authors: Tung Sheng Shih, Linchi Wang, Guoping Changchien, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
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emissions of polychlorinated dibenzo p dioxins and dibenzofurans from stack flue gases of Sinter Plants
Chemosphere, 2003Co-Authors: Linchi Wang, Perng-jy Tsai, Guoping ChangchienAbstract:Abstract This study investigated four Sinter Plants, classified into two categories––with selective catalytic reduction (SCR) (S1, S2 and S3) and without SCR (S4) as its air pollution control device. Polychlorinated dibenzofurans (PCDFs) are dominant in the stack flue gases of Sinter Plants with and without SCR. The polychlorinated dibenzofurans/polychlorinated dibenzo- p -dioxins (PCDFs/PCDDs) ratio exceeds 1 extremely. The degree of chlorination of the Sinter Plant without SCR is towards hepta and hexa congeners while that of the Sinter Plant with SCR is towards penta and hexa congeners. PCDD/Fs are indeed decomposed (75.5% and 69% on ng and ng TEQ bases, respectively) and not only reduced in degree of chlorination. The overall concentration in the stack flue gas of Sinter Plants with SCR (7.97–14.1 ng/N m 3 ; 0.995–2.06 ng TEQ/N m 3 ) is lower than that of the Sinter Plant without SCR (28.9 ng/N m 3 ; 3.10 ng TEQ/N m 3 ). In Taiwan, based on the emission factors of 0.970 μg TEQ/ton-feedstock (Sinter Plants with SCR) and 3.13 μg TEQ/ton-feedstock (Sinter Plant without SCR), the annual PCDD/F emission of 44.7 g TEQ/year from Sinter Plants is 60 and 121 times higher than those from municipal solid waste incinerators (0.750 g TEQ/year) and MWIs (0.369 g TEQ/year). These results show that Sinter Plants have become the dominating PCDD/F emission source since tighter emission limits have been applied to incinerators.
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emissions of polychlorinated dibenzo p dioxins and dibenzofurans from stack flue gases of Sinter Plants
Chemosphere, 2003Co-Authors: Linchi Wang, Perng-jy Tsai, Guoping ChangchienAbstract:Abstract This study investigated four Sinter Plants, classified into two categories––with selective catalytic reduction (SCR) (S1, S2 and S3) and without SCR (S4) as its air pollution control device. Polychlorinated dibenzofurans (PCDFs) are dominant in the stack flue gases of Sinter Plants with and without SCR. The polychlorinated dibenzofurans/polychlorinated dibenzo- p -dioxins (PCDFs/PCDDs) ratio exceeds 1 extremely. The degree of chlorination of the Sinter Plant without SCR is towards hepta and hexa congeners while that of the Sinter Plant with SCR is towards penta and hexa congeners. PCDD/Fs are indeed decomposed (75.5% and 69% on ng and ng TEQ bases, respectively) and not only reduced in degree of chlorination. The overall concentration in the stack flue gas of Sinter Plants with SCR (7.97–14.1 ng/N m 3 ; 0.995–2.06 ng TEQ/N m 3 ) is lower than that of the Sinter Plant without SCR (28.9 ng/N m 3 ; 3.10 ng TEQ/N m 3 ). In Taiwan, based on the emission factors of 0.970 μg TEQ/ton-feedstock (Sinter Plants with SCR) and 3.13 μg TEQ/ton-feedstock (Sinter Plant without SCR), the annual PCDD/F emission of 44.7 g TEQ/year from Sinter Plants is 60 and 121 times higher than those from municipal solid waste incinerators (0.750 g TEQ/year) and MWIs (0.369 g TEQ/year). These results show that Sinter Plants have become the dominating PCDD/F emission source since tighter emission limits have been applied to incinerators.
Linchi Wang - One of the best experts on this subject based on the ideXlab platform.
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correcting the gas and particle partitioning of pcdd f congeners in the flue gas of an iron ore Sinter Plant
Journal of Hazardous Materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Pengchi Tsai, Linchi Wang, Guoping ChangchienAbstract:Abstract This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP ash ) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were −58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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Correcting the gas and particle partitioning of PCDD/F congeners in the flue gas of an iron ore Sinter Plant.
Journal of hazardous materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Linchi Wang, Perng-jy Tsai, Guo-ping Chang-chienAbstract:This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP(ash)) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were -58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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exposure and health risk assessment of polychlorinated dibenzo p dioxins and dibenzofurans pcdd fs for Sinter Plant workers
Environment International, 2008Co-Authors: Tung Sheng Shih, Linchi Wang, Guoping Changchien, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
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Exposure and health-risk assessment of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) for Sinter Plant workers.
Environment International, 2007Co-Authors: Tung Sheng Shih, Guo-ping Chang-chien, Linchi Wang, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
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emissions of polychlorinated dibenzo p dioxins and dibenzofurans from stack flue gases of Sinter Plants
Chemosphere, 2003Co-Authors: Linchi Wang, Perng-jy Tsai, Guoping ChangchienAbstract:Abstract This study investigated four Sinter Plants, classified into two categories––with selective catalytic reduction (SCR) (S1, S2 and S3) and without SCR (S4) as its air pollution control device. Polychlorinated dibenzofurans (PCDFs) are dominant in the stack flue gases of Sinter Plants with and without SCR. The polychlorinated dibenzofurans/polychlorinated dibenzo- p -dioxins (PCDFs/PCDDs) ratio exceeds 1 extremely. The degree of chlorination of the Sinter Plant without SCR is towards hepta and hexa congeners while that of the Sinter Plant with SCR is towards penta and hexa congeners. PCDD/Fs are indeed decomposed (75.5% and 69% on ng and ng TEQ bases, respectively) and not only reduced in degree of chlorination. The overall concentration in the stack flue gas of Sinter Plants with SCR (7.97–14.1 ng/N m 3 ; 0.995–2.06 ng TEQ/N m 3 ) is lower than that of the Sinter Plant without SCR (28.9 ng/N m 3 ; 3.10 ng TEQ/N m 3 ). In Taiwan, based on the emission factors of 0.970 μg TEQ/ton-feedstock (Sinter Plants with SCR) and 3.13 μg TEQ/ton-feedstock (Sinter Plant without SCR), the annual PCDD/F emission of 44.7 g TEQ/year from Sinter Plants is 60 and 121 times higher than those from municipal solid waste incinerators (0.750 g TEQ/year) and MWIs (0.369 g TEQ/year). These results show that Sinter Plants have become the dominating PCDD/F emission source since tighter emission limits have been applied to incinerators.
Yucheng Chen - One of the best experts on this subject based on the ideXlab platform.
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reducing polychlorinated dibenzo p dioxins and dibenzofurans pcdd f emissions from a real scale iron ore Sinter Plant by adjusting its Sinter raw mix
Journal of Cleaner Production, 2016Co-Authors: Yucheng Chen, Ying Fang Wang, Mei-ru Chen, Ching-hwa Chen, Chungsik Yoon, Perng-jy TsaiAbstract:Abstract This study was conducted in a real-scale iron ore Sinter Plant for reducing emissions of polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) from the iron ore Sintering process via the adjustment of its Sinter raw mix. Based on operating condition of the selected Plant, four experimental campaigns of C ref (currently used raw mix, served as the reference), C H (modified from C ref , with a 15% increase in hematite but 15% decrease in limonite), C H,EP (modified from C H, without electrostatic precipitator (EP) and blast furnace (BF) flue dusts), and C H,EP,W (modified from C H,EP, with a 0.5 wt% increase in water content) were chosen. For each experimental campaign, three replicate samples of PCDD/Fs were collected from the flue gases, and the Sinter productivity and Sinter strength were measured simultaneously. In comparison with C ref , the most significant reductions in PCDD/F and I-TEQ emissions was found in C H,EP (=68% and 76%, respectively), and the main reduction was found in PCDFs (54–76% decrease). C H could reduce emissions of PCDD/Fs and I-TEQ by 47% and 51%, respectively. But the addition of water contents (i.e., C H,EP,W ) did not result in further reductions. Since Sinter productivity and Sinter strength of all experimental campaigns were quite similar, C H,EP could be a promising raw mix for reducing PCDD/F emissions from the Sintering process.
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Reducing polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) emissions from a real-scale iron ore Sinter Plant by adjusting its Sinter raw mix
Journal of Cleaner Production, 2016Co-Authors: Yucheng Chen, Ying Fang Wang, Mei-ru Chen, Ching-hwa Chen, Chungsik Yoon, Perng-jy TsaiAbstract:Abstract This study was conducted in a real-scale iron ore Sinter Plant for reducing emissions of polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) from the iron ore Sintering process via the adjustment of its Sinter raw mix. Based on operating condition of the selected Plant, four experimental campaigns of C ref (currently used raw mix, served as the reference), C H (modified from C ref , with a 15% increase in hematite but 15% decrease in limonite), C H,EP (modified from C H, without electrostatic precipitator (EP) and blast furnace (BF) flue dusts), and C H,EP,W (modified from C H,EP, with a 0.5 wt% increase in water content) were chosen. For each experimental campaign, three replicate samples of PCDD/Fs were collected from the flue gases, and the Sinter productivity and Sinter strength were measured simultaneously. In comparison with C ref , the most significant reductions in PCDD/F and I-TEQ emissions was found in C H,EP (=68% and 76%, respectively), and the main reduction was found in PCDFs (54–76% decrease). C H could reduce emissions of PCDD/Fs and I-TEQ by 47% and 51%, respectively. But the addition of water contents (i.e., C H,EP,W ) did not result in further reductions. Since Sinter productivity and Sinter strength of all experimental campaigns were quite similar, C H,EP could be a promising raw mix for reducing PCDD/F emissions from the Sintering process.
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correcting the gas and particle partitioning of pcdd f congeners in the flue gas of an iron ore Sinter Plant
Journal of Hazardous Materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Pengchi Tsai, Linchi Wang, Guoping ChangchienAbstract:Abstract This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP ash ) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were −58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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Correcting the gas and particle partitioning of PCDD/F congeners in the flue gas of an iron ore Sinter Plant.
Journal of hazardous materials, 2012Co-Authors: Yucheng Chen, Jeng How Yang, Linchi Wang, Perng-jy Tsai, Guo-ping Chang-chienAbstract:This study was aimed at developing an approach for correcting the gas and particle partitioning of PCDD/F congeners for samples collected from the flue gas of an iron ore Sinter Plant. An iron ore Sinter Plant equipped with an electrostatic precipitator (EP) and a selective catalytic reduction (SCR) was selected. Flue gas samples were collected at EP inlet, EP outlet and SCR outlet. Both particle- and gas-phase PCDD/Fs were analyzed for each collected sample. PCDD/F contents in EP ashes (EP(ash)) were also analyzed and used to correct the gas and particle partitioning of PCDD/F congeners of the collected flue gas samples. Results show that PCDD/Fs in the flue gas were dominated by the gas-phase. Before correction, the removal efficiencies for the gas- and particle-phase PCDD/Fs for EP were -58.1% and 64.3%, respectively, and SCR were 39.4% and 83.9%, respectively. The above results were conflict with the expected results for both EP and SCR indicating the need for correcting the gas and particle partitioning of PCDD/F congeners for all collected flue gas samples. After correction, the removal efficiencies become more reasonable for EP (=4.22% and 97.7%, respectively), and SCR (=54.7% and 62.0%, respectively). The above results confirm the effectiveness of the approach developed by this study.
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exposure and health risk assessment of polychlorinated dibenzo p dioxins and dibenzofurans pcdd fs for Sinter Plant workers
Environment International, 2008Co-Authors: Tung Sheng Shih, Linchi Wang, Guoping Changchien, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
Tung Sheng Shih - One of the best experts on this subject based on the ideXlab platform.
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exposure and health risk assessment of polychlorinated dibenzo p dioxins and dibenzofurans pcdd fs for Sinter Plant workers
Environment International, 2008Co-Authors: Tung Sheng Shih, Linchi Wang, Guoping Changchien, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.
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Exposure and health-risk assessment of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) for Sinter Plant workers.
Environment International, 2007Co-Authors: Tung Sheng Shih, Guo-ping Chang-chien, Linchi Wang, Yucheng Chen, Wen-jhy Lee, Minliang Shih, Sheng-lung Huang, Perng-jy TsaiAbstract:Abstract This study was set out to assess polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) exposures and health-risk impact posed on Sinter Plant workers. One Sinter Plant located in southern Taiwan was selected and their workers were divided into four exposure groups based on their work tasks, including raw material charging workers, Sintering grate workers, shredding workers, and others. Results show that their mean total PCDD/F and the corresponding total I-TEQ exposure levels shared the same trend as: shredding workers > others > Sintering grate workers > raw material charging workers. For all selected exposure groups, their PCDD/F exposures were dominated by the particle phase contents. Congener profiles of the gaseous + particle phase PCDD/Fs were found with more fractions of high chlorinated congeners than low chlorinated congeners. The lifetime average daily doses (LADDs) and their resultant excess cancer risks (ECRs) found for Sinter Plant workers were higher than those residents living at the residential area and rural area, but were lower than those living at the nearby of the selected Sinter Plant, urban area, industrial area. Considering ECRs of the Sinter Plant workers were still higher than 10 − 6 suggesting the need for adopting proper control measurements for reducing workers' PCDD/F exposures, particularly for those Sinter zone workers.