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Impacts of co-contaminants and dilution on perchlorate biodegradation using various carbon sources.
Saedi, Yasaman; Batista, Jacimaria R; Britto, Ronnie; Grady, Dana.
Afiliación
  • Saedi Y; Department of Civil and Environmental Engineering and Construction, University of Nevada Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, NV, 89154-4015, USA.
  • Batista JR; Department of Civil and Environmental Engineering and Construction, University of Nevada Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, NV, 89154-4015, USA. Jaci.batista@unlv.edu.
  • Britto R; Tetra Tech Inc, 720 Coleherne Road, Collierville, TN, 38017, USA.
  • Grady D; Tetra Tech Inc, 720 Coleherne Road, Collierville, TN, 38017, USA.
Biodegradation ; 34(4): 301-323, 2023 08.
Article en En | MEDLINE | ID: mdl-36598629
This research investigates the biodegradation of perchlorate in the presence of the co-contaminants nitrate and chlorate using soluble and slow-release carbon sources. In addition, the impact of bio-augmentation and dilution, which results in lower total dissolved salts (TDS) and contaminant levels, is examined. Laboratory microcosms were conducted using actual groundwater and soils from a contaminated aquifer. The results revealed that both soluble and slow-release carbon sources support biodegradation of contaminants in the sequence nitrate > chlorate > perchlorate. Degradation rates, including and excluding lag times, revealed that the overall impact of the presence of co-contaminants depends on degradation kinetics and the relative concentrations of the contaminants. When the lag time caused by the presence of the co-contaminants is considered, the degradation rates for chlorate and perchlorate were two to three times slower. The results also show that dilution causes lower initial contaminant concentrations, and consequently, slower degradation rates, which is not desirable. On the other hand, the dilution resulting from the injection of amendments to support remediation promotes desirably lower salinity levels. However, the salinity associated with the presence of sulfate does not inhibit biodegradation. The naturally occurring bacteria were able to support the degradation of all contaminants. Bio-augmentation was effective only in diluted microcosms. Proteobacteria and Firmicutes were the dominant phyla identified in the microcosms.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Nitratos Idioma: En Revista: Biodegradation Asunto de la revista: BIOQUIMICA / SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Nitratos Idioma: En Revista: Biodegradation Asunto de la revista: BIOQUIMICA / SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos