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Biodegradation in oil sands process-affected water: A comprehensive laboratory analysis of the in situ biodegradation of dissolved organic acids.
Asiedu, Evelyn; Zhao, Kankan; Anwar, Mian Nabeel; Ross, Matthew; Balaberda, Amy-Lynne; Ulrich, Ania C.
Afiliación
  • Asiedu E; Division of Analytical & Environmental Toxicology, Department of Laboratory Medicine & Pathology, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada.
  • Zhao K; Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
  • Anwar MN; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada.
  • Ross M; Department of Physical Sciences, MacEwan University, Edmonton, Alberta, T5J 2P2, Canada.
  • Balaberda AL; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada.
  • Ulrich AC; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada. Electronic address: aulrich@ualberta.ca.
Chemosphere ; 349: 141018, 2024 Feb.
Article en En | MEDLINE | ID: mdl-38141671
ABSTRACT
Oil sands process-affected water (OSPW) is a by-product of the extraction of bitumen, and volumes of OSPW have accumulated across the Alberta oil sands region due to the governments zero-discharge policy. Some dissolved organics in OSPW, including toxic naphthenic acids (NAs), can be biodegraded in oxic conditions, thereby reducing the toxicity of OSPW. While there has been much focus on degradation of NAs, the biodegradation of other dissolved organic chemicals by endogenous organisms remains understudied. Here, using the HPLC-ultrahigh resolution Orbitrap mass spectrometry, we examined the microbial biodegradation of dissolved organic acids in OSPW. Non-targeted analysis enabled the estimation of biodegradation rates for unique heteroatomic chemical classes detected in negative ion mode. The microcosm experiments were conducted with and without nutrient supplementation, and the changes in the microbial community over time were investigated. Without added nutrients, internal standard-adjusted intensities of all organics, including NAs, were largely unchanged. The addition of nutrients increased the biodegradation rate of O2- and SO2- chemical classes. While anoxic biodegradation can occur in tailings ponds and end pit lakes, microbial community analyses confirmed that the presence of oxygen stimulated biodegradation of the OSPW samples studied. We detected several aerobic hydrocarbon-degrading microbes (e.g., Pseudomonas and Brevundimonas), and microbes capable of degrading sulfur-containing hydrocarbons (e.g., Microbacterium). Microbial community diversity decreased over time with nutrient addition. Overall, the results from this study indicate that toxic dissolved organics beyond NAs can be biodegraded by endogenous organisms in OSPW, but reaffirms that biological treatment strategies require careful consideration of how nutrients and dissolved oxygen may impact efficacy.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Yacimiento de Petróleo y Gas Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Yacimiento de Petróleo y Gas Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido