Inhibition of growth, iron, and sulfur oxidation in <i>Thiobacillus ferrooxidans</i> by simple organic compounds

Tuttle, Jon H.; Dugan, Patrick R.

doi:10.1139/m76-105

Cited by 99 publications

(52 citation statements)

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“…Similarly it was reported that the ferrous iron oxidation by T. ferrooxidans was depressed by sodium dodecylsulfate surfactant [267] and the covellite oxidation by Tergitot, Tween 20 and Triton X-100 surfactants [64]. An inhibitory effect has been observed for other surface active substances [272][273][274], and flotation agents [275] on ferrous ion and copper sulfides oxidation. It is known [222,[269][270][271] that the lithotrophic bacteria (T. thiooxidans and T. ferrooxidans) secrete certain chelating and wetting agents into the leach solutions.…”

Section: H) Effects Of Surface Active Agents and Organic Solventsmentioning

confidence: 62%

The role of Thiobacillus ferrooxidans in hydrometallurgical processes

Torma

1977

Advances in Biochemical Engineering/Biotechnology

105

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Section: H) Effects Of Surface Active Agents and Organic Solventsmentioning

confidence: 62%

The role of Thiobacillus ferrooxidans in hydrometallurgical processes

Torma

1977

Advances in Biochemical Engineering/Biotechnology

105

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“…[17][18][19][20] This effect could be the primary reason for inefficient metal leaching with T. ferrooxidans at high sludge solids concentrations. Different amounts of the sludge extracts were added into the incubation media to substantiate the inhibiting effect of the sludge extract on the Fe oxidation efficiency of T. ferrooxidans.…”

Section: Results and Discussion Microbial Leaching Of Heavy Metals Wimentioning

confidence: 99%

Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

Cho

Ryu

Lee

et al. 2002

Journal of the Air & Waste Management Association

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Microbial metal leaching from sewage sludge (2-9% w/v) was carried out with the iron-oxidizing bacterium Thiobacillus ferrooxidans. Measurements of pH, oxidationreduction potential, and concentration of Fe 2+ indicated that T. ferrooxidans was effective in removing metals from an incubation bath containing less than 5% sludge solids concentration. Specifically, Cu leaching was completely suppressed at a high solids concentration of 9% (w/v). Results indicated that the deactivation of T. ferrooxidans at a high sludge content was mainly due to the presence of inhibiting materials such as organic matter. A mixed culture of sulfur-oxidizing bacteria was obtained by enrichment from anaerobically digested sewage sludge to enhance the efficiency of the microbial leaching process. These bacteria were much more effective in metal leaching than was iron-oxidizing T. ferrooxidans. At 9% (w/v) solids concentration, the leaching efficiencies of Zn and Cu were 78% (2.66 g/kg dry sludge) and 59% (1.36 g/kg dry sludge), respectively. Therefore, when removing heavy metals from the anaerobically digested sewage sludge, the indigenous sulfur-oxidizing bacteria isolated in the current study were more efficient than T. ferrooxidans, especially at high sludge solids concentrations.

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“…Frankena et al 1985) or homofermentative fermentation of glucose to for instance acetic acid (Schwartz & Keller 1982). Acids, however, may uncouple energy generation from biomass formation (Baronofsky et al 1984;Tuttle & Dugan 1976;Verduyn et al 1990b), although this probably depends to a major extent on the culture pH. Alternatively, export of acids may yield energy under certain conditions, as shown for lactate efflux by Streptococcus cremoris (Otto et al 1980).…”

Section: Discussionmentioning

confidence: 99%

A theoretical evaluation of growth yields of yeasts

Verduyn

Stouthamer

Scheffers

et al. 1991

Antonie van Leeuwenhoek

212

176

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Growth yields of Saccharomyces cerevisiae and Candida utilis in carbon-limited chemostat cultures were evaluated. The yields on ethanol and acetate were much lower in S. cerevisiae, in line with earlier reports that site I phosphorylation is absent in this yeast. However, during aerobic growth on glucose both organisms had the same cell yield. This can be attributed to two factors: -S. cerevisiae had a lower protein content than C. utilis; -uptake of glucose by C. utilis requires energy whereas in S. cerevisiae it occurs via facilitated diffusion. Theoretical calculations showed that, as a result of these two factors, the ATP requirement for biomass formation in C. utilis is 35% higher than in S. cerevisiae (theoretical YATP values of 20.8 and 28.1, respectively). The experimental YATP for anaerobic growth of S. cerevisiae on glucose was 16 g biomass-mol ATP -1.In vivo P/O-ratios can be calculated for aerobic growth on ethanol and acetate, provided that the gap between the theoretical and experimental ATP requirements as observed for growth on glucose is taken into account. This was done in two ways: -via the assumption that the gap is independent of the growth substrate (i.e. a fixed amount of ATP bridges the difference between the theoretical and experimental values). -alternatively, on the assumption that the difference is a fraction of the total ATP expenditure, that is dependent on the substrate. Calculations of P/O-ratios for growth of both yeasts on glucose, ethanol, and acetate made clear that only by assuming a fixed difference between theoretical and experimental ATP requirements, the P/O-ratios are more or less independent of the growth substrate. These P/O-ratios are approximately 30% lower than the calculated mechanistic values.

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Inhibition of growth, iron, and sulfur oxidation in Thiobacillus ferrooxidans by simple organic compounds

Cited by 99 publications

References 0 publications

The role of Thiobacillus ferrooxidans in hydrometallurgical processes

The role of Thiobacillus ferrooxidans in hydrometallurgical processes

Effect of Solids Concentration on Bacterial Leaching of Heavy Metals from Sewage Sludge

A theoretical evaluation of growth yields of yeasts

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