Effects of environmental conditions on aerobic degradation of a commercial naphthenic acid

Kinley, Ciera M.; Gaspari, Daniel P.; McQueen, Andrew D.; Rodgers, John H.; Castle, James W.; Friesen, Vanessa; Haakensen, Monique

doi:10.1016/j.chemosphere.2016.07.050

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…In this study, an isolate was used to create a controlled system for proof of concept, and it is important to note that the treatment will likely improve when using an indigenous microbial consortium, which should be investigated in the future. However, BH media was used in this study to examine the potential of Merichem NAs to act as a carbon source without nitrogen and phosphorous as confounding variables; therefore, microbial degradation in nutrient-limited OSPW may be hindered and, thus, require biostimulation [ 73 , 74 , 75 ]. In addition, Merichem NAs generally contain linear lower-molecular-weight compounds with 7–17 carbon atoms ( n ), which are considered more biodegradable than the complex mixture of NAFCs found in OSPW including higher-molecular-weight ( n = 7–28) compounds [ 5 , 76 ].…”

Section: Resultsmentioning

confidence: 99%

Persulfate Oxidation Coupled with Biodegradation by Pseudomonas fluorescens Enhances Naphthenic Acid Remediation and Toxicity Reduction

Balaberda

Ulrich

2021

Microorganisms

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The extraction of bitumen from the Albertan oilsands produces large amounts of oil sands process-affected water (OSPW) that requires remediation. Classical naphthenic acids (NAs), a complex mixture of organic compounds containing O2− species, are present in the acid extractable organic fraction of OSPW and are a primary cause of acute toxicity. A potential remediation strategy is combining chemical oxidation and biodegradation. Persulfate as an oxidant is advantageous, as it is powerful, economical, and less harmful towards microorganisms. This is the first study to examine persulfate oxidation coupled to biodegradation for NA remediation. Merichem NAs were reacted with 100, 250, 500, and 1000 mg/L of unactivated persulfate at 21 °C and 500 and 1000 mg/L of activated persulfate at 30 °C, then inoculated with Pseudomonas fluorescens LP6a after 2 months. At 21 °C, the coupled treatment removed 52.8–98.9% of Merichem NAs, while 30 °C saw increased removals of 99.4–99.7%. Coupling persulfate oxidation with biodegradation improved removal of Merichem NAs and chemical oxidation demand by up to 1.8× and 6.7×, respectively, and microbial viability was enhanced up to 4.6×. Acute toxicity towards Vibrio fischeri was negatively impacted by synergistic interactions between the persulfate and Merichem NAs; however, it was ultimately reduced by 74.5–100%. This study supports that persulfate oxidation coupled to biodegradation is an effective and feasible treatment to remove NAs and reduce toxicity.

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Section: Resultsmentioning

confidence: 99%

Persulfate Oxidation Coupled with Biodegradation by Pseudomonas fluorescens Enhances Naphthenic Acid Remediation and Toxicity Reduction

Balaberda

Ulrich

2021

Microorganisms

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“…However, significant degradation of a diamondoid NA compound (1-adamantanecarboxylic acid, or ACA) was not observed under anoxic conditions, suggesting that more recalcitrant NAs may be resistant to anaerobic degradation pathways (Folwell et al 2016 ). Also, higher degradation rates were measured for commercial NAs under well-oxygenated conditions (dissolved oxygen concentration >8 mg L −1 ) when compared to less oxygenated treatments (Kinley et al 2016 ). Therefore, the availability of oxygen, sulfate, nitrate, or other putative electron acceptors can be a major factor controlling the type of NA compounds that are microbially degraded and the rate of microbial NA degradation (Skeels and Whitby 2019 ).…”

Section: Factors Influencing the Biodegradability Of Nasmentioning

confidence: 99%

“…Environmental conditions such as oxygen concentration, temperature, nutrients, pH, redox potential, and sunlight may strongly affect the microbial degradation of NAs (Whitby 2010 , Wong et al 2015 , Kinley et al 2016 ). The effectiveness of biodegradation is dependent on the environmental conditions such as availability of nutrients, temperature, and electron acceptors required for microbial growth.…”

Section: Factors Influencing the Biodegradability Of Nasmentioning

confidence: 99%

“…In addition, low temperature has been shown to negatively affect NA degradation rates (Lai et al 1996 ). In controlled experiments with commercial NAs, Kinley et al ( 2016 ) reported lower NA degradation rates and lower microbial diversity in the low temperature (6–16°C) treatments. Similarly, in the northern region of Alberta, Canada, Wong et al ( 2015 ) detected NA biodegradation only at occasionally high summer temperatures, while no biodegradation was observed at 4°C.…”

Section: Factors Influencing the Biodegradability Of Nasmentioning

confidence: 99%

“…Nutrient availability and pH have also been identified as important factors influencing NA degradation. Kinley et al ( 2016 ) showed that higher pH (between 8 and 9) and nutrient availability (nitrogen (N) and phosphorus (P)) positively affects NA degradation rates. This suggests that biostimulation (i.e.…”

Section: Factors Influencing the Biodegradability Of Nasmentioning

confidence: 99%

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Microbial degradation of naphthenic acids using constructed wetland treatment systems: metabolic and genomic insights for improved bioremediation of process-affected water

Reis,

Correa-Garcia,

Tremblay

et al. 2023

FEMS Microbiology Ecology

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Naphthenic acids (NAs) are a complex mixture of organic compounds released during bitumen extraction from mined oil sands that are important contaminants of oil sands process-affected water (OSPW). NAs can be toxic to aquatic organisms and, therefore, are a main target compound for OSPW. The ability of microorganisms to degrade NAs can be exploited for bioremediation of OSPW using constructed wetland treatment systems (CWTS), which represent a possible low energy and low-cost option for scalable in situ NA removal. Recent advances in genomics and analytical chemistry have provided insights into a better understanding of the metabolic pathways and genes involved in NA degradation. Here, we discuss the ecology of microbial NA degradation with a focus on CWTS and summarize the current knowledge related to the metabolic pathways and genes used by microorganisms to degrade NAs. Evidence to date suggests that NAs are mostly degraded aerobically through ring cleavage via the beta-oxidation pathway, which can be combined with other steps such as aromatization, alpha-oxidation, omega-oxidation, or activation as coenzyme A (CoA) thioesters. Anaerobic NA degradation has also been reported via the production of benzoyl-CoA as an intermediate and/or through the involvement of methanogens or nitrate, sulfate, and iron reducers. Furthermore, we discuss how genomic, statistical, and modeling tools can assist in the development of improved bioremediation practices.

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Viability of In Situ and Ex Situ Bioremediation Approaches for Degradation of Noxious Substances in Stressed Environs

Butnariu

Buţu

2020

Bioremediation and Biotechnology, Vol 4

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Effects of environmental conditions on aerobic degradation of a commercial naphthenic acid

Cited by 10 publications

References 45 publications

Persulfate Oxidation Coupled with Biodegradation by Pseudomonas fluorescens Enhances Naphthenic Acid Remediation and Toxicity Reduction

Persulfate Oxidation Coupled with Biodegradation by Pseudomonas fluorescens Enhances Naphthenic Acid Remediation and Toxicity Reduction

Microbial degradation of naphthenic acids using constructed wetland treatment systems: metabolic and genomic insights for improved bioremediation of process-affected water

Viability of In Situ and Ex Situ Bioremediation Approaches for Degradation of Noxious Substances in Stressed Environs

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