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A Light Touch: Solar Photocatalysis Detoxifies Oil Sands Process-Affected Waters Prior to Significant Treatment of Naphthenic Acids
https://orcid.org/0000-0002-1229-1509
https://orcid.org/0000-0002-5933-7906
https://orcid.org/0000-0001-8749-9075
Environmental reclamation of Canada’s oil sands tailings ponds is among the single largest water treatment challenges globally. The toxicity of oil sands process-affected water (OSPW) has been associated with its dissolved organics, a complex mixture of naphthenic acid fraction components (NAFCs). Here, we evaluated solar treatment with buoyant photocatalysts (BPCs) as a passive advanced oxidation process (P-AOP) for OSPW remediation. Photocatalysis fully degraded naphthenic acids (NAs) and acid extractable organics (AEO) in 3 different OSPW samples. However, classical NAs and AEO, traditionally considered among the principal toxicants in OSPW, were not correlated with OSPW toxicity herein. Instead, nontarget petroleomic analysis revealed that low-polarity organosulfur compounds, composing <10% of the total AEO, apparently accounted for the majority of waters’ toxicity to fish, as described by a model of tissue partitioning. These findings have implications for OSPW release, for which a less extensive but more selective treatment may be required than previously expected.
Solar photocatalytic treatment detoxified multiple OSPWs as per standard regulatory bioassays prior to significant changes to NA concentrations, implying that only a mild, targeted treatment may be necessary for treated releases to be protective of downstream uses.
A Light Touch: Solar Photocatalysis Detoxifies Oil Sands Process-Affected Waters Prior to Significant Treatment of Naphthenic Acids
https://orcid.org/0000-0002-1229-1509
https://orcid.org/0000-0002-5933-7906
https://orcid.org/0000-0001-8749-9075
Environmental reclamation of Canada’s oil sands tailings ponds is among the single largest water treatment challenges globally. The toxicity of oil sands process-affected water (OSPW) has been associated with its dissolved organics, a complex mixture of naphthenic acid fraction components (NAFCs). Here, we evaluated solar treatment with buoyant photocatalysts (BPCs) as a passive advanced oxidation process (P-AOP) for OSPW remediation. Photocatalysis fully degraded naphthenic acids (NAs) and acid extractable organics (AEO) in 3 different OSPW samples. However, classical NAs and AEO, traditionally considered among the principal toxicants in OSPW, were not correlated with OSPW toxicity herein. Instead, nontarget petroleomic analysis revealed that low-polarity organosulfur compounds, composing <10% of the total AEO, apparently accounted for the majority of waters’ toxicity to fish, as described by a model of tissue partitioning. These findings have implications for OSPW release, for which a less extensive but more selective treatment may be required than previously expected.
Solar photocatalytic treatment detoxified multiple OSPWs as per standard regulatory bioassays prior to significant changes to NA concentrations, implying that only a mild, targeted treatment may be necessary for treated releases to be protective of downstream uses.
A Light Touch: Solar Photocatalysis Detoxifies Oil Sands Process-Affected Waters Prior to Significant Treatment of Naphthenic Acids
https://orcid.org/0000-0002-1229-1509
https://orcid.org/0000-0002-5933-7906
https://orcid.org/0000-0001-8749-9075
Environmental reclamation of Canada’s oil sands tailings ponds is among the single largest water treatment challenges globally. The toxicity of oil sands process-affected water (OSPW) has been associated with its dissolved organics, a complex mixture of naphthenic acid fraction components (NAFCs). Here, we evaluated solar treatment with buoyant photocatalysts (BPCs) as a passive advanced oxidation process (P-AOP) for OSPW remediation. Photocatalysis fully degraded naphthenic acids (NAs) and acid extractable organics (AEO) in 3 different OSPW samples. However, classical NAs and AEO, traditionally considered among the principal toxicants in OSPW, were not correlated with OSPW toxicity herein. Instead, nontarget petroleomic analysis revealed that low-polarity organosulfur compounds, composing <10% of the total AEO, apparently accounted for the majority of waters’ toxicity to fish, as described by a model of tissue partitioning. These findings have implications for OSPW release, for which a less extensive but more selective treatment may be required than previously expected.
Solar photocatalytic treatment detoxified multiple OSPWs as per standard regulatory bioassays prior to significant changes to NA concentrations, implying that only a mild, targeted treatment may be necessary for treated releases to be protective of downstream uses.
A Light Touch: Solar Photocatalysis Detoxifies Oil Sands Process-Affected Waters Prior to Significant Treatment of Naphthenic Acids
Leshuk, Timothy M. C. (Autor:in) / Young, Zachary W. (Autor:in) / Wilson, Brad (Autor:in) / Chen, Zi Qi (Autor:in) / Smith, Danielle A. (Autor:in) / Lazaris, Greg (Autor:in) / Gopanchuk, Mary (Autor:in) / McLay, Sean (Autor:in) / Seelemann, Corin A. (Autor:in) / Paradis, Theo (Autor:in)
ACS ES&T Water ; 4 ; 1483-1497
12.04.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| DOAJ | 2018
| Taylor & Francis Verlag | 2013
| American Chemical Society | 2023