Geochemical and microbial reactions affecting the long-term performance of in situ ‘iron barriers’

Liang, Liyuan; Korte, Nic; Gu, Baohua; Puls, Robert W.; Reeter, Charles

doi:10.1016/s1093-0191(00)00026-5

Cited by 123 publications

(90 citation statements)

References 36 publications

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“…Given Fe(III)'s low solubility, considerable attention has been paid to Fe(III) sensing and acquisition by bacteria, and much is understood about these processes (43,53,59,67). Less is understood about Fe(II) sensing and uptake despite the facts that many environments contain Fe(II) (2,29) and that increased solubility of Fe(II) renders it more bioavailable than Fe(III) (35). In particular, Fe(II) is known to be important in acidic and/or reducing environments (35,38,57), and such conditions can easily arise at the microscale in diverse habitats (28,46), including biofilms (21).…”

mentioning

confidence: 99%

BqsR/BqsS Constitute a Two-Component System That Senses Extracellular Fe(II) in Pseudomonas aeruginosa

Kreamer¹,

Wilks²,

Marlow³

et al. 2011

Journal of Bacteriology

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Pseudomonas aeruginosa is a ubiquitous Gram-negative bacterium best known as the predominant opportunistic pathogen infecting the lungs of cystic fibrosis patients. In this context, it is thought to form biofilms, within which locally reducing and acidic conditions can develop that favor the stability of ferrous iron [Fe(II)]. Because iron is a signal that stimulates biofilm formation, we performed a microarray study to determine whether P. aeruginosa strain PA14 exhibits a specific transcriptional response to extracellular Fe(II). Among the genes that were most upregulated in response to Fe(II) were those encoding the twocomponent system BqsR/BqsS, previously identified for its role in P. aeruginosa strain PAO1 biofilm decay (13)

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mentioning

confidence: 99%

BqsR/BqsS Constitute a Two-Component System That Senses Extracellular Fe(II) in Pseudomonas aeruginosa

Kreamer¹,

Wilks²,

Marlow³

et al. 2011

Journal of Bacteriology

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“…DCE and VC are co-contaminants with the parent compounds TCE and PCE at most sites where any degree of microbe-driven natural attenuation is occurring. In addition to the CVOCs, native inorganic parameters (e.g., calcium, magnesium, and alkalinity) are present in the groundwater and react with the ZVI to form precipitates that could potentially deposit on and passivate the ZVI surfaces (Liang et al, 2000). However, these changes typically are expected to take place over several years and this is the reason why the PRB needs to be monitored over the long term.…”

Section: Tce Plume In Groundwater At Moffett Fieldmentioning

confidence: 99%

Long Term Performance Assessment of a Permeable Reactive Barrier at Former Naval AITR Station Moffett Field

Gavaskar¹,

Yoon²,

Sminchak³

et al. 2005

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITORS ACRONYM(S) ESTCP SPONSOR/MONITOR'S REPORT NUMBER(S)Environmental Security Technology Certification Program 901 North Stuart Street, Suite 303 Arlington, VA 22203 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThe primary objective of this report is to describe the results of the last round of monitoring conducted in July 2004, their relationship to the results of pervious rounds, and their implications for the longevity and hydraulic performance of the permeable reactive barrier (PRB). ii ACKNOWLEDGEMENTS This study was funded by the Department of Defense's (DoD) Environmental Security Technologies Certification Program (ESTCP) through the Naval Facilities Engineering Service Center (NFESC). Battelle, under contract to NFESC conducted the laboratory and field investigation associated with the study. The authors also acknowledge the support provided by Mary Parker from Navy's Southern Division and by several staff from Tetra-Tech EMI, the on-site Navy contractor, who provided additional field support. SUBJECT TERMSiii EXECUTIVE SUMMARYA permeable reactive barrier (PRB) filled with zero-valent iron (ZVI) was installed at former Naval Air Station (NAS) Moffett Field in April 1996 and monitored periodically for the next 8 years. This pilot-scale PRB intercepts the more concentrated core of a relatively large regional groundwater plume of CVOCs that is approximately two miles long and a mile wide. The primary objective of this report is to describe the results of the last round of monitoring conducted in July 2004, their relationship to the results of pervious rounds, and their implications for the longevity and hydraulic performance of the PRB.The primary contaminant in the plume is trichloroethylene (TCE). Considerable amount of cis-1,2 dichloroethylene (DCE) is also present in the groundwater, thus indicating that some natural attenuation through anaerobic reductive dechlorination is underway at the site. The cleanup targets for these two compounds are the same as the federal drinking water standards or maximum contaminant levels (MCL) of 5 ppb (TCE) and 70 ppb (DCE).The long-term monitoring of this PRB showed that the ZVI continues to react strongly with the chlorinated volatile organic compounds (CVOC), primarily TCE and DCE, present in the groundwater. For the first time in July 2004, there were signs that a treated water front was exiting the PRB, fl...

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“…Similarly, biological activity at the same barrier studied by O'Hannesin and Gillham (1998) remained low after two years (Matheson 1994) while some laboratory (Gu et al 1999) and pilot studies (Liang et al 1997) did observe significant increases in biological activity with time. These varying results can be related to differences in groundwater geochemistry, as recently reviewed by Liang et al (2000). In general, when the groundwater is more highly buffered, that is, when alkalinity and sulfate are high, the pH change within the iron is moderated, and both precipitation and microbial activity are enhanced.…”

Section: Effects Of Groundwater Chemistry On Barrier Longevitymentioning

confidence: 99%

Zero-Valent Iron Permeable Reactive Barriers: A Review of Performance

Korte¹

2001

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Geochemical and microbial reactions affecting the long-term performance of in situ ‘iron barriers’

Cited by 123 publications

References 36 publications

BqsR/BqsS Constitute a Two-Component System That Senses Extracellular Fe(II) in Pseudomonas aeruginosa

BqsR/BqsS Constitute a Two-Component System That Senses Extracellular Fe(II) in Pseudomonas aeruginosa

Long Term Performance Assessment of a Permeable Reactive Barrier at Former Naval AITR Station Moffett Field

Zero-Valent Iron Permeable Reactive Barriers: A Review of Performance

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