The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Jinwook Chung - One of the best experts on this subject based on the ideXlab platform.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H(2)-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California's San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l(-1) and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l(-1). Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 microg-ClO(4) l(-1). As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 microg-As l(-1). DBCP, present in one groundwater at 1.4 microg l(-1), was reduced to below its detection limit of 0.01 microg l(-1), which is well below California's 0.2 microg l(-1) MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se degrees or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H(2)-based MBfR can reduce multiple oxidized contaminants simultaneously.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H2-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California’s San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l−1 and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l−1. Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 µg-ClO4 l−1. As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 µg-As l−1. DBCP, present in one groundwater at 1.4 µg l−1, was reduced to below its detection limit of 0.01 µg l−1, which is well below California’s 0.2 µg l−1 MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se° or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H2-based MBfR can reduce multiple oxidized contaminants simultaneously.
Reid H Bowman - One of the best experts on this subject based on the ideXlab platform.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H(2)-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California's San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l(-1) and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l(-1). Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 microg-ClO(4) l(-1). As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 microg-As l(-1). DBCP, present in one groundwater at 1.4 microg l(-1), was reduced to below its detection limit of 0.01 microg l(-1), which is well below California's 0.2 microg l(-1) MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se degrees or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H(2)-based MBfR can reduce multiple oxidized contaminants simultaneously.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H2-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California’s San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l−1 and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l−1. Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 µg-ClO4 l−1. As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 µg-As l−1. DBCP, present in one groundwater at 1.4 µg l−1, was reduced to below its detection limit of 0.01 µg l−1, which is well below California’s 0.2 µg l−1 MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se° or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H2-based MBfR can reduce multiple oxidized contaminants simultaneously.
Bruce E Rittmann - One of the best experts on this subject based on the ideXlab platform.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H(2)-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California's San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l(-1) and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l(-1). Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 microg-ClO(4) l(-1). As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 microg-As l(-1). DBCP, present in one groundwater at 1.4 microg l(-1), was reduced to below its detection limit of 0.01 microg l(-1), which is well below California's 0.2 microg l(-1) MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se degrees or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H(2)-based MBfR can reduce multiple oxidized contaminants simultaneously.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H2-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California’s San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l−1 and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l−1. Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 µg-ClO4 l−1. As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 µg-As l−1. DBCP, present in one groundwater at 1.4 µg l−1, was reduced to below its detection limit of 0.01 µg l−1, which is well below California’s 0.2 µg l−1 MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se° or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H2-based MBfR can reduce multiple oxidized contaminants simultaneously.
Uwe Morgenstern - One of the best experts on this subject based on the ideXlab platform.
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Regional-scale identification of groundwater-surface water interaction using hydrochemistry and multivariate statistical methods, Wairarapa Valley, New Zealand
Hydrology and Earth System Sciences, 2011Co-Authors: M. R. Guggenmos, Christopher J. Daughney, Bethanna Jackson, Uwe MorgensternAbstract:Abstract. Identifying areas of interaction between groundwater and surface water is crucial for effective environmental management, because this interaction is known to influence water quantity and quality. This paper applies hydrochemistry and multivariate statistics to identify locations and mechanisms of groundwater-surface water interaction in the pastorally dominated Wairarapa Valley, New Zealand. Hierarchical Cluster Analysis (HCA) and Principal Components Analysis (PCA) were conducted using site-specific median values of Ca, Mg, Na, K, HCO3, Cl, SO4 and electrical conductivity from 22 surface water sites and 246 groundwater sites. Surface water and groundwater monitoring sites were grouped together in three of the seven clusters identified by HCA, with the inference made that similarities in hydrochemistry indicate groundwater-surface water interaction. PCA indicated that the clusters were largely differentiated by total dissolved solids concentration, redox condition and ratio of major ions. Shallow aerobic Groundwaters, located in close proximity to losing reaches of rivers, were grouped with similar Ca-HCO3 type surface waters, indicating potential recharge to aquifers from these river systems. Groundwaters that displayed a rainfall-recharged chemical signature with higher Na relative to Ca, higher Cl relative to HCO3 and an accumulation of NO3 were grouped with neighbouring surface waters, suggesting the provision of groundwater base flow to these river systems and the transfer of this chemical signature from underlying aquifers. The hydrochemical techniques used in this study did not reveal groundwater-surface water interaction in some parts of the study area, specifically where deep anoxic Groundwaters, high in total dissolved solids with a distinct Na-Cl signature, showed no apparent link to surface water. The drivers of hydrochemistry inferred from HCA and PCA are consistent with previous measurements of 18O, water age and excess air. Overall, this study has shown that multivariate statistics can be used as a rapid method to identify groundwater-surface water interaction at a regional scale using existing hydrochemical datasets.
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Regional-scale identification of groundwater-surface water interaction using hydrochemistry and multivariate statistical methods, Wairarapa Valley, New Zealand
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: M. R. Guggenmos, Christopher J. Daughney, B. M. Jackson, Uwe MorgensternAbstract:Abstract. Identifying areas of interaction between groundwater and surface water is crucial for effective environmental management, because this interaction is known to influence water quantity and quality. This paper applies hydrochemistry and multivariate statistics to identify locations and mechanisms of groundwater-surface water interaction in the pastorally dominated Wairarapa Valley, New Zealand. Hierarchical Cluster Analysis (HCA) and Principal Components Analysis (PCA) were conducted using site-specific median values of Ca, Mg, Na, K, HCO3, Cl, SO4 and electrical conductivity from 22 surface water sites and 246 groundwater sites. Surface water and groundwater monitoring sites were grouped together in three of the seven clusters identified by HCA, with the inference made that similarities in hydrochemistry indicate groundwater-surface water interaction. PCA indicated that the clusters were largely differentiated by total dissolved solids concentration, redox potential and ratio of major ions. Shallow aerobic Groundwaters, located in close proximity to losing reaches of rivers, were grouped with similar Ca-HCO3 type surface waters, indicating potential recharge to aquifers from these river systems. Groundwaters that displayed a rainfall-recharged chemical signature with higher Na relative to Ca, higher Cl relative to HCO3 and an accumulation of NO3 were grouped with neighbouring surface waters, suggesting the provision of groundwater base flow to these river systems and the transfer of this chemical signature from underlying aquifers. The hydrochemical techniques used in this study did not reveal groundwater-surface water interaction in some parts of the study area, specifically where deep anoxic Groundwaters, high in total dissolved solids with a distinct Na-Cl signature, showed no apparent link to surface water. The drivers of hydrochemistry inferred from HCA and PCA are consistent with previous measurements of 18O, water age and excess air. Overall, this study has shown that multivariate statistics can be used as a rapid method to identify groundwater-surface water interaction at a regional scale using existing hydrochemical datasets.
William F Wright - One of the best experts on this subject based on the ideXlab platform.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H(2)-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California's San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l(-1) and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l(-1). Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 microg-ClO(4) l(-1). As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 microg-As l(-1). DBCP, present in one groundwater at 1.4 microg l(-1), was reduced to below its detection limit of 0.01 microg l(-1), which is well below California's 0.2 microg l(-1) MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se degrees or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H(2)-based MBfR can reduce multiple oxidized contaminants simultaneously.
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simultaneous bio reduction of nitrate perchlorate selenate chromate arsenate and dibromochloropropane using a hydrogen based membrane biofilm reactor
Biodegradation, 2007Co-Authors: Jinwook Chung, Bruce E Rittmann, William F Wright, Reid H BowmanAbstract:We tested the hypothesis that the H2-based membrane biofilm reactor (MBfR) is capable of reducing multiple oxidized contaminants, a common situation for groundwater contamination. We conducted bench-scale experiments with three groundwater samples collected from California’s San Joaquin Valley and on two synthetic Groundwaters containing selenate and chromate. The actual groundwater sources had nitrate levels exceeding 10 mg-N l−1 and different combinations of anthropogenic perchlorate + chlorate, arsenate, and dibromochloropropane (DBCP). For all actual Groundwaters, the MBfR reduced nitrate to less than 0.01 mg-N l−1. Present in two Groundwaters, perchlorate + chlorate was reduced to below the California Notification Level, 6 µg-ClO4 l−1. As(V) was substantially reduced to As(III) for two Groundwaters samples, which had influent As(V) concentrations from 3 to 8.8 µg-As l−1. DBCP, present in one groundwater at 1.4 µg l−1, was reduced to below its detection limit of 0.01 µg l−1, which is well below California’s 0.2 µg l−1 MCL for DBCP. For the synthetic Groundwaters, two MBfRs initially reduced Se(VI) or Cr(VI) stably to Se° or Cr(III). When we switched the influent oxidized contaminants, the new oxidized contaminant was reduced immediately, and its reduction soon was approximately the same or greater than it had been reduced in its original MBfR. These results support that the H2-based MBfR can reduce multiple oxidized contaminants simultaneously.
