Microbially — related redox changes in a subtropical lake 2. Simulation of metalinmetic conditions in a chemostat

Eckert, Werner

doi:10.1007/bf00002686

Cited by 5 publications

(7 citation statements)

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“…The possible influence of phototrophic bacteria on the pe/pH 2 S relationships found with this studies was investigated in a related study (Eckert 1993) by stimulating the metalimnetic conditions present in Lake Kinneret. …”

Section: General Discussion and Conclusionmentioning

confidence: 97%

“…developed by Eckert (1993) was applied for sulfide rich Kinneret water. Total sulfide concentrations [S(-II)I were calculated for dilute Kinneret water and pH 9.0 from the measured pH 2 S, temperature and pH values using the relationship: where the pK, (first protolysis constant of the H 2 S-HS--S 2 -system) = 3.122 + 1132/T, temperature in degrees K (Broderius & Smith 1977).…”

Section: In Situ Measurementsmentioning

confidence: 99%

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Microbially — related redox changes in a subtropical lake I.In situ monitoring of the annual redox cycle

Eckert

Trüper

1993

Biogeochemistry

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Abstract. Using a recently developed in situ multiprobe the redox development in the water column of warm-monomictic Lake Kinneret was investigated during three annual cycles. During the time when sulfide release into the meta-and hypolimnion is initiated, our measurements show a linear relationship, close to the thermodynamic function, between the platinum electrode potential and the amount of sulfide produced by the sulfate reducing bacteria. A change of this relationship during summer stratification coincides with the bloom of the phototrophic sulfur bacterium Chlorobium phaeobacteroides.

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Section: General Discussion and Conclusionmentioning

confidence: 97%

Section: In Situ Measurementsmentioning

confidence: 99%

Microbially — related redox changes in a subtropical lake I.In situ monitoring of the annual redox cycle

Eckert

Trüper

1993

Biogeochemistry

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“…This means that the measured redox potential is kinetically determined rather than being dependent on the concentration of all dissolved reactants (Bockris and Reddy, 1970). Because other researchers found a linear relationship between the measured redox potential and the logarithm of the sulfide concentration (Berner, 1963;Eckert, 1993) it most likely has a high current exchange density (i 0 ) at a platinum surface whereas oxygen has a very low value (Eckert, 1993). Literature values for i 0 are reported from 40 A и cm −2 for the Br 2 /Br − system to 10 −9 A и cm −2 for the O 2 /O ‫ס‬ system (Eckert, 1993).…”

Section: Origin Of the Redox Potentialmentioning

confidence: 99%

“…Because other researchers found a linear relationship between the measured redox potential and the logarithm of the sulfide concentration (Berner, 1963;Eckert, 1993) it most likely has a high current exchange density (i 0 ) at a platinum surface whereas oxygen has a very low value (Eckert, 1993). Literature values for i 0 are reported from 40 A и cm −2 for the Br 2 /Br − system to 10 −9 A и cm −2 for the O 2 /O ‫ס‬ system (Eckert, 1993). Unfortunately, the i 0 value for hydrogen sulfide at a Pt surface is not known, although it might be concluded from our results that it will be closer to the value for the Br 2 /Br − than to the O 2 /O ‫ס‬ system.…”

Section: Origin Of the Redox Potentialmentioning

confidence: 99%

“…Several redox couples may prevail and all of them contribute to the measured, overall redox value. However, several authors revealed the existence of a linear relationship between the measured redox potential and the logarithm of the hydrogen sulfide concentration in natural environments (Berner, 1963;Eckert, 1993;Frevert, 1984). In a sulfide-oxidizing bioreactor the measured redox potential therefore, will predominantly be determined by the sulfide concentration.…”

Section: Introductionmentioning

confidence: 99%

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Application of the redox potential for controling a sulfide oxidizing bioreactor

Janssen¹,

Meijer²,

Bontsema³

et al. 1998

Biotechnol. Bioeng.

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Abstract:The investigations described show that the formation of elemental sulfur from the biological oxidation of sulfide can be optimized by controling the redox state of the solution. The nonsoluble sulfur can be removed by gravity sedimentation and re-used as a raw material, i.e., in bioleaching processes. It was shown that, by supplying an almost stoichiometrical amount of oxygen to the recirculated gas phase, the formation of sulfate is minimized. The redox potential is mainly determined by the sulfide concentration because this compound has a high standard exchange current density with the platinum electrode surface. By maintaining a particular redox setpoint value, in fact, the reactor becomes a ''sulfide-stat.'' It was shown that in a sulfide-oxidizing bioreactor the measured redox potential, using a polished redox electrode, is kinetically determined rather than thermodynamically. The optimal redox value for sulfur formation is between −147 and −137 mV (H 2 reference electrode, 30°C, pH 8). The presented results are currently used for controling several full-scale installations, which desulfurize biogas and high-pressure natural gas.

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Application of the redox potential for controling a sulfide oxidizing bioreactor

Janssen

Meijer

Bontsema

et al. 1998

Biotechnol. Bioeng.

View full text Add to dashboard Cite

The investigations described show that the formation of elemental sulfur from the biological oxidation of sulfide can be optimized by controling the redox state of the solution. The nonsoluble sulfur can be removed by gravity sedimentation and re‐used as a raw material, i.e., in bioleaching processes. It was shown that, by supplying an almost stoichiometrical amount of oxygen to the recirculated gas phase, the formation of sulfate is minimized. The redox potential is mainly determined by the sulfide concentration because this compound has a high standard exchange current density with the platinum electrode surface. By maintaining a particular redox setpoint value, in fact, the reactor becomes a “sulfide‐stat.” It was shown that in a sulfide‐oxidizing bioreactor the measured redox potential, using a polished redox electrode, is kinetically determined rather than thermodynamically. The optimal redox value for sulfur formation is between −147 and −137 mV (H2 reference electrode, 30°C, pH 8). The presented results are currently used for controling several full‐scale installations, which desulfurize biogas and high‐pressure natural gas. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 147–155, 1998.

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Microbially — related redox changes in a subtropical lake 2. Simulation of metalinmetic conditions in a chemostat

Cited by 5 publications

References 20 publications

Microbially — related redox changes in a subtropical lake I.In situ monitoring of the annual redox cycle

Microbially — related redox changes in a subtropical lake I.In situ monitoring of the annual redox cycle

Application of the redox potential for controling a sulfide oxidizing bioreactor

Application of the redox potential for controling a sulfide oxidizing bioreactor

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