Bioaugmentation of Fe(0) for the Remediation of Chlorinated Aliphatic Hydrocarbons

Gregory, Kelvin B.; Mason, Michael G.; Picken, Heath D.; Weathers, Lenly J.; Parkin, Gene F.

doi:10.1089/ees.2000.17.169

Cited by 27 publications

(28 citation statements)

References 21 publications

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“…Because lactate was not provided to column Fe(O)+SRB, the microorganisms apparently did not have enough time to switch from heterotrophic to autotrophic growth using H2 as electron donor and HCO3' as carbon source. demonstrated previously Till et al , 1998;Gregory et al , 2000;Wildman and Alvarez, 2001). The hypothesis of this work was that a system combining a mixed culture of SRB with Fe(0) would have a greater total Cr(V1) removal capacity than a purely abiotic Fe (0) system.…”

Section: Resultssupporting

confidence: 57%

“…As a result, we have added to the growing body of research demonstrating the positive effects of seeding zero-valent iron PRl3s with anaerobic bacteria for the removal of pollutants, including nitrate (Till et al, 1998), chlorinated organics Gregory et al, 2000) the nitramine explosive RDX (Wildman and Alvarez,200 1) and, with this study, hexavalent chromium. …”

Section: Resultsmentioning

confidence: 99%

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Reduction and Immobilization of Radionuclides and Toxic Metal Ions Using Combined Zero Valent Iron and Anaerobic Bacteria

Weathers¹,

Katz²

2002

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Reduction and Immobilization of Radionuclides and Toxic Metal Ions Using Combined Zero Valent Iron and Anaerobic Bacteria

Weathers¹,

Katz²

2002

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“…This inhibition may have not been observable in other experiments that combined Fe(0) and bacteria (e.g., Gregory et al 2000;Novak et al 1998;Till et al 1998;Weathers et al 1997) because most of the contaminants investigated are susceptible to abiotic reduction by reduced Fe species (e.g., Kim & Picardal 1999;Klausen et al 1995;McCormick et al 2002;Weber et al 2001). Therefore, the inhibition of bacteria may be masked by reaction of the contaminant with the reduced Fe species.…”

Section: Characterization Of Fe Precipitatesmentioning

confidence: 92%

“…In these combined systems, bacteria utilize hydrogen and possibly ferrous iron produced from corrosion of Fe(0) as electron donors (Daniels et al 1987;Rajagopal & Legall 1989). Research conducted over the last decade has demonstrated that removal of redox sensitive pollutants can be enhanced by combining Fe(0) and bacteria (Gregory et al 2000;Novak et al 1998;Till et al 1998;Weathers et al 1997). For example, Weathers et al (1997) showed that removal of chloroform was faster and more complete by combining Fe(0) and anaerobic bacteria than it was with Fe(0) alone or bacteria alone.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of bacterial perchlorate reduction by zero-valent iron

et al. 2005

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Perchlorate was reduced by a mixed bacterial culture over a pH range of 7.0-8.9. Similar rates of perchlorate reduction were observed between pH 7.0 and 8.5, whereas significantly slower reduction occurred at pH 8.9. Addition of iron metal, Fe(0), to the mixed bacterial culture resulted in slower rates of perchlorate reduction. Negligible perchlorate reduction was observed under abiotic conditions with Fe(0) alone in a reduced anaerobic medium. The inhibition of perchlorate reduction observed in the presence of Fe(0) is in contrast to previous studies that have shown faster rates of contaminant reduction when bacteria and Fe(0) were combined compared to bacteria alone. The addition of Fe(0) resulted in a rise in pH, as well as precipitation of Fe minerals that appeared to encapsulate the bacterial cells. In experiments where pH was kept constant, the addition of Fe(0) still resulted in slower rates of perchlorate reduction suggesting that encapsulation of bacteria by Fe precipitates contributed to the inhibition of the bacterial activity independent of the effect of pH on bacteria. These results provide the first evidence linking accumulation of iron precipitates at the cell surface to inhibition of environmental contaminant degradation. Fe(0) was not a suitable amendment to stimulate perchlorate-degrading bacteria and the bacterial inhibition caused by precipitation of reduced Fe species may be important in other combined anaerobic bacterial-Fe(0) systems. Furthermore, the inhibition of bacterial activity by iron precipitation may have significant implications for the design of in situ bioremediation technologies for treatment of perchlorate plumes.

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“…Table 2 through Table 5 include peer-reviewed articles only. Admittedly, some relevant peer-reviewed articles have been overseen by the used search procedures [151][152][153][154][155][156][157][158]. Academic thesis [117], technical reports [159,160] and patents [161] do exist as well but are not considered herein because they have also not specified key issues addressed in this review.…”

Section: Current Use Of Steel Wool For Water Treatmentmentioning

confidence: 99%

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Ndé-Tchoupé

Crane

Mwakabona

et al. 2015

Water

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Since the realization in the 1930s that elevated fluoride concentrations in drinking water can have detrimental effects on human health, new methods have been progressively developed in order to reduce fluoride to acceptable levels. In the developing world the necessity for filtration media that are both low-cost and sourced from locally available materials has resulted in the widespread use of bone char. Since the early 1990s metallic iron (Fe 0 ) has received widespread use as both an adsorbent and a reducing agent for the removal of a wide range of contaminant species from water. The ion-selectivity of Fe 0 is dictated by the positively charged surface of iron (hydr)oxides at circumneutral pH. This suggests that Fe 0 could potentially be applied as suitable filter media for the negatively charged fluoride ion. This communication seeks to demonstrate from a theoretical basis and using empirical data from the literature the suitability of Fe 0 filters for fluoride removal. The work concludes that Fe 0 -bearing materials, such as steel wool, hold good promise as low-cost, readily available and highly effective decentralized fluoride treatment materials.

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Bioaugmentation of Fe(0) for the Remediation of Chlorinated Aliphatic Hydrocarbons

Cited by 27 publications

References 21 publications

Reduction and Immobilization of Radionuclides and Toxic Metal Ions Using Combined Zero Valent Iron and Anaerobic Bacteria

Reduction and Immobilization of Radionuclides and Toxic Metal Ions Using Combined Zero Valent Iron and Anaerobic Bacteria

Inhibition of bacterial perchlorate reduction by zero-valent iron

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

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