The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Long D. Nghiem - One of the best experts on this subject based on the ideXlab platform.
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enhancement of removal of trace organic contaminants by powdered activated carbon dosing into membrane bioreactors
Journal of The Taiwan Institute of Chemical Engineers, 2014Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Chul Park, Kazuo YamamotoAbstract:Abstract This study compared the removal efficiency of 22 widespread trace organic contaminants by a laboratory-scale membrane bioreactor (MBR) with and without direct addition of powdered activated carbon (PAC) into the activated sludge reactor over a period of 312 days. The removal of hydrophilic and biologically persistent trace organic contaminants was immediately improved to above 95% after the addition of PAC into MBR. However, a compound-specific gradual decrease in removal underscored the requirement for the addition of fresh PAC. Adsorption onto PAC-added sludge appeared to play a significant role in the relatively more effective aqueous phase removal of a few resistant compounds such as carbamazepine in this study. A slower reduction in removal efficiency of compounds showing extraordinary persistence such as Fenoprop and diclofenac was observed after raising the PAC concentration in the MBR from 0.1 to 0.5 g/L. Nevertheless, comparison of extent of removal in terms of PAC usage indicated the suitability of more frequent dosing of smaller amounts of PAC.
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coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal breakthrough behaviour of persistent and hydrophilic compounds
Journal of Environmental Management, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, Fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, Fenoprop and diclofenac occurred within 1000-3000 bed volumes (BV), the same level of breakthrough of the two neutral compounds metronidazole and carbamazepine did not occur until 11,000 BV. Single-solute isotherm parameters did not demonstrate any discernible correlation individually with any of the parameters that may govern adsorption onto GAC, such as log D, number of hydrogen-bond donor/acceptor groups, dipole moment or aromaticity ratio of the compounds. The isotherm data, however, could differentiate the breakthrough behaviour between negatively charged and neutral trace organic contaminants.
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comparison between sequential and simultaneous application of activated carbon with membrane bioreactor for trace organic contaminant removal
Bioresource Technology, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Kuolun TungAbstract:Abstract The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBR–GAC) and simultaneous application of PAC within MBR (PAC–MBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, Fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50–70%, in MBR–GAC and PAC–MBR, respectively). Based on a simple comparison from the long-term performance stability and activated carbon usage points of view, PAC–MBR appears to be a better option than MBR–GAC treatment.
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removal of trace organic contaminants by a membrane bioreactor granular activated carbon mbr gac system
Bioresource Technology, 2012Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:The removal of trace organics by a membrane bioreactor-granular activated carbon (MBR-GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (log D>3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and Fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR-GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an extended period, breakthrough of diclofenac was observed after 7320 BV. This suggests that strict monitoring should be applied over the lifetime of the GAC column to detect the breakthrough of hydrophilic and persistent compounds which have low removal by MBR treatment.
Luong N. Nguyen - One of the best experts on this subject based on the ideXlab platform.
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enhancement of removal of trace organic contaminants by powdered activated carbon dosing into membrane bioreactors
Journal of The Taiwan Institute of Chemical Engineers, 2014Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Chul Park, Kazuo YamamotoAbstract:Abstract This study compared the removal efficiency of 22 widespread trace organic contaminants by a laboratory-scale membrane bioreactor (MBR) with and without direct addition of powdered activated carbon (PAC) into the activated sludge reactor over a period of 312 days. The removal of hydrophilic and biologically persistent trace organic contaminants was immediately improved to above 95% after the addition of PAC into MBR. However, a compound-specific gradual decrease in removal underscored the requirement for the addition of fresh PAC. Adsorption onto PAC-added sludge appeared to play a significant role in the relatively more effective aqueous phase removal of a few resistant compounds such as carbamazepine in this study. A slower reduction in removal efficiency of compounds showing extraordinary persistence such as Fenoprop and diclofenac was observed after raising the PAC concentration in the MBR from 0.1 to 0.5 g/L. Nevertheless, comparison of extent of removal in terms of PAC usage indicated the suitability of more frequent dosing of smaller amounts of PAC.
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coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal breakthrough behaviour of persistent and hydrophilic compounds
Journal of Environmental Management, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, Fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, Fenoprop and diclofenac occurred within 1000-3000 bed volumes (BV), the same level of breakthrough of the two neutral compounds metronidazole and carbamazepine did not occur until 11,000 BV. Single-solute isotherm parameters did not demonstrate any discernible correlation individually with any of the parameters that may govern adsorption onto GAC, such as log D, number of hydrogen-bond donor/acceptor groups, dipole moment or aromaticity ratio of the compounds. The isotherm data, however, could differentiate the breakthrough behaviour between negatively charged and neutral trace organic contaminants.
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comparison between sequential and simultaneous application of activated carbon with membrane bioreactor for trace organic contaminant removal
Bioresource Technology, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Kuolun TungAbstract:Abstract The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBR–GAC) and simultaneous application of PAC within MBR (PAC–MBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, Fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50–70%, in MBR–GAC and PAC–MBR, respectively). Based on a simple comparison from the long-term performance stability and activated carbon usage points of view, PAC–MBR appears to be a better option than MBR–GAC treatment.
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removal of trace organic contaminants by a membrane bioreactor granular activated carbon mbr gac system
Bioresource Technology, 2012Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:The removal of trace organics by a membrane bioreactor-granular activated carbon (MBR-GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (log D>3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and Fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR-GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an extended period, breakthrough of diclofenac was observed after 7320 BV. This suggests that strict monitoring should be applied over the lifetime of the GAC column to detect the breakthrough of hydrophilic and persistent compounds which have low removal by MBR treatment.
Jinguo Kang - One of the best experts on this subject based on the ideXlab platform.
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enhancement of removal of trace organic contaminants by powdered activated carbon dosing into membrane bioreactors
Journal of The Taiwan Institute of Chemical Engineers, 2014Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Chul Park, Kazuo YamamotoAbstract:Abstract This study compared the removal efficiency of 22 widespread trace organic contaminants by a laboratory-scale membrane bioreactor (MBR) with and without direct addition of powdered activated carbon (PAC) into the activated sludge reactor over a period of 312 days. The removal of hydrophilic and biologically persistent trace organic contaminants was immediately improved to above 95% after the addition of PAC into MBR. However, a compound-specific gradual decrease in removal underscored the requirement for the addition of fresh PAC. Adsorption onto PAC-added sludge appeared to play a significant role in the relatively more effective aqueous phase removal of a few resistant compounds such as carbamazepine in this study. A slower reduction in removal efficiency of compounds showing extraordinary persistence such as Fenoprop and diclofenac was observed after raising the PAC concentration in the MBR from 0.1 to 0.5 g/L. Nevertheless, comparison of extent of removal in terms of PAC usage indicated the suitability of more frequent dosing of smaller amounts of PAC.
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coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal breakthrough behaviour of persistent and hydrophilic compounds
Journal of Environmental Management, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, Fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, Fenoprop and diclofenac occurred within 1000-3000 bed volumes (BV), the same level of breakthrough of the two neutral compounds metronidazole and carbamazepine did not occur until 11,000 BV. Single-solute isotherm parameters did not demonstrate any discernible correlation individually with any of the parameters that may govern adsorption onto GAC, such as log D, number of hydrogen-bond donor/acceptor groups, dipole moment or aromaticity ratio of the compounds. The isotherm data, however, could differentiate the breakthrough behaviour between negatively charged and neutral trace organic contaminants.
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comparison between sequential and simultaneous application of activated carbon with membrane bioreactor for trace organic contaminant removal
Bioresource Technology, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Kuolun TungAbstract:Abstract The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBR–GAC) and simultaneous application of PAC within MBR (PAC–MBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, Fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50–70%, in MBR–GAC and PAC–MBR, respectively). Based on a simple comparison from the long-term performance stability and activated carbon usage points of view, PAC–MBR appears to be a better option than MBR–GAC treatment.
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removal of trace organic contaminants by a membrane bioreactor granular activated carbon mbr gac system
Bioresource Technology, 2012Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:The removal of trace organics by a membrane bioreactor-granular activated carbon (MBR-GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (log D>3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and Fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR-GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an extended period, breakthrough of diclofenac was observed after 7320 BV. This suggests that strict monitoring should be applied over the lifetime of the GAC column to detect the breakthrough of hydrophilic and persistent compounds which have low removal by MBR treatment.
William E Price - One of the best experts on this subject based on the ideXlab platform.
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enhancement of removal of trace organic contaminants by powdered activated carbon dosing into membrane bioreactors
Journal of The Taiwan Institute of Chemical Engineers, 2014Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Chul Park, Kazuo YamamotoAbstract:Abstract This study compared the removal efficiency of 22 widespread trace organic contaminants by a laboratory-scale membrane bioreactor (MBR) with and without direct addition of powdered activated carbon (PAC) into the activated sludge reactor over a period of 312 days. The removal of hydrophilic and biologically persistent trace organic contaminants was immediately improved to above 95% after the addition of PAC into MBR. However, a compound-specific gradual decrease in removal underscored the requirement for the addition of fresh PAC. Adsorption onto PAC-added sludge appeared to play a significant role in the relatively more effective aqueous phase removal of a few resistant compounds such as carbamazepine in this study. A slower reduction in removal efficiency of compounds showing extraordinary persistence such as Fenoprop and diclofenac was observed after raising the PAC concentration in the MBR from 0.1 to 0.5 g/L. Nevertheless, comparison of extent of removal in terms of PAC usage indicated the suitability of more frequent dosing of smaller amounts of PAC.
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coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal breakthrough behaviour of persistent and hydrophilic compounds
Journal of Environmental Management, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, Fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, Fenoprop and diclofenac occurred within 1000-3000 bed volumes (BV), the same level of breakthrough of the two neutral compounds metronidazole and carbamazepine did not occur until 11,000 BV. Single-solute isotherm parameters did not demonstrate any discernible correlation individually with any of the parameters that may govern adsorption onto GAC, such as log D, number of hydrogen-bond donor/acceptor groups, dipole moment or aromaticity ratio of the compounds. The isotherm data, however, could differentiate the breakthrough behaviour between negatively charged and neutral trace organic contaminants.
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comparison between sequential and simultaneous application of activated carbon with membrane bioreactor for trace organic contaminant removal
Bioresource Technology, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, Long D. Nghiem, William E Price, Kuolun TungAbstract:Abstract The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBR–GAC) and simultaneous application of PAC within MBR (PAC–MBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, Fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50–70%, in MBR–GAC and PAC–MBR, respectively). Based on a simple comparison from the long-term performance stability and activated carbon usage points of view, PAC–MBR appears to be a better option than MBR–GAC treatment.
-
removal of trace organic contaminants by a membrane bioreactor granular activated carbon mbr gac system
Bioresource Technology, 2012Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:The removal of trace organics by a membrane bioreactor-granular activated carbon (MBR-GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (log D>3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and Fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR-GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an extended period, breakthrough of diclofenac was observed after 7320 BV. This suggests that strict monitoring should be applied over the lifetime of the GAC column to detect the breakthrough of hydrophilic and persistent compounds which have low removal by MBR treatment.
Faisal I Hai - One of the best experts on this subject based on the ideXlab platform.
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coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal breakthrough behaviour of persistent and hydrophilic compounds
Journal of Environmental Management, 2013Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, Fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, Fenoprop and diclofenac occurred within 1000-3000 bed volumes (BV), the same level of breakthrough of the two neutral compounds metronidazole and carbamazepine did not occur until 11,000 BV. Single-solute isotherm parameters did not demonstrate any discernible correlation individually with any of the parameters that may govern adsorption onto GAC, such as log D, number of hydrogen-bond donor/acceptor groups, dipole moment or aromaticity ratio of the compounds. The isotherm data, however, could differentiate the breakthrough behaviour between negatively charged and neutral trace organic contaminants.
-
removal of trace organic contaminants by a membrane bioreactor granular activated carbon mbr gac system
Bioresource Technology, 2012Co-Authors: Luong N. Nguyen, Jinguo Kang, William E Price, Faisal I Hai, Long D. NghiemAbstract:The removal of trace organics by a membrane bioreactor-granular activated carbon (MBR-GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (log D>3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and Fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR-GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an extended period, breakthrough of diclofenac was observed after 7320 BV. This suggests that strict monitoring should be applied over the lifetime of the GAC column to detect the breakthrough of hydrophilic and persistent compounds which have low removal by MBR treatment.