Effect of process conditions on the performance of a dual-reactor biodesulfurization process

Rink, Rieks de; Gupta, Suyash; Carolis, Flavia Piccioli de; Liu, Dandan; Heijne, Annemiek ter; Klok, Johannes B.M.; Buisman, C.J.N.

doi:10.1016/j.jece.2021.106450

Cited by 16 publications

(31 citation statements)

References 37 publications

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“…The inoculum was prepared by mixing effluent from a full-scale desulfurization installation treating amine acid gas , and effluent from previous experiments in the same installation in a ratio of approximately 1:1. Due to the circulation through all process sections (i.e., absorber column, anaerobic bioreactor and aerated bioreactor, see section ), the alkalinity and concentrations of SO 4 2– , S 2 O 3 2– , S 8 , and bacteria are homogeneous throughout the entire system. ,, Thus, the microbial composition in a sample taken from the aerated bioreactor is representative for the entire system.…”

Section: Methodsmentioning

confidence: 99%

“…The system was filled with a 50/50 mixture of a 0.8 M NaHCO 3 solution and inoculum as described elsewhere. 23 The inoculum was prepared by mixing effluent from a full-scale desulfurization installation treating amine acid gas 21,24 and effluent from previous experiments in the same installation 20 in a ratio of approximately 1:1. Due to the circulation through all process sections (i.e., absorber column, anaerobic bioreactor and aerated bioreactor, see section 2.3.1), the alkalinity and concentrations of SO 4 2− , S 2 O 3 2− , S 8 , and bacteria are homogeneous throughout the entire system.…”

Section: Batch Experimentsmentioning

confidence: 99%

“…Due to the circulation through all process sections (i.e., absorber column, anaerobic bioreactor and aerated bioreactor, see section 2.3.1), the alkalinity and concentrations of SO 4 2− , S 2 O 3 2− , S 8 , and bacteria are homogeneous throughout the entire system. 20,23,24 Thus, the microbial composition in a sample taken from the aerated bioreactor is representative for the entire system.…”

Section: Batch Experimentsmentioning

confidence: 99%

“…NGS analysis revealed that the microbial composition in the process fluctuates significantly. 23 SO 4 2− formation only occurs when bacteria are present that can form SO 4 2− . Thus, even when the specific charge of the SOB is below <0.3 mC L mg•N −1 , the selectivity for SO 4 2− formation can still be low when the bacterial population is dominated by SOB that are limited to the formation of S 8 .…”

Section: Modeling Charge Storage In Sobmentioning

confidence: 99%

“…This is the same value as during previous experiments. 19,20,23 For both conditions, the ORP setpoint was changed stepwise. The initial measurement was done at the original ORP setpoint of −370 mV and thereafter at −390 mV.…”

Section: Measurement Of Chargementioning

confidence: 99%

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Bacteria Determine the Measured Oxidation Reduction Potential in the Biological Gas Desulfurization Process

Rink

Liu²,

Heijne

et al. 2022

ACS Sustainable Chem. Eng.

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In the biotechnological gas desulfurization process, dissolved sulfide is oxidized into predominantly elemental sulfur (S8) by sulfide oxidizing bacteria (SOB) under strict oxygen limited conditions. An online measurement of the oxidation reduction potential (ORP) is used to control the O2 supply to the bioreactor to maximize the selectivity for S8 formation and minimize unwanted sulfate formation. While the ORP in the bioreactor is considered to be a measure of mainly sulfide and oxygen concentrations, in practice, none of these components are detectable. In this study, we investigated the sensitivity of stored charge in SOB toward ORP. Stored charge in SOB was measured in an electrochemical cell. These SOB were harvested from the bioreactor of a pilot-scale desulfurization installation. The bioreactor, in which sulfide was not detectable, was operated at different ORP setpoints (−250 to −390 mV vs Ag/AgCl). It was found that more charge was recovered from SOB when the ORP in the aerated bioreactor was lower. These measurements were used to calibrate a model to describe the ORP based on charge storage in SOB, which showed that S8 formation increases and sulfate formation decreases when SOB contain more charge. This can be used to further optimize the biotechnological desulfurization process.

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Section: Methodsmentioning

confidence: 99%

Section: Batch Experimentsmentioning

confidence: 99%

Section: Batch Experimentsmentioning

confidence: 99%

Section: Modeling Charge Storage In Sobmentioning

confidence: 99%

Section: Measurement Of Chargementioning

confidence: 99%

See 3 more Smart Citations

Bacteria Determine the Measured Oxidation Reduction Potential in the Biological Gas Desulfurization Process

Rink

Liu²,

Heijne

et al. 2022

ACS Sustainable Chem. Eng.

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Electric discharge by sulphide shuttling bacteria

Linssen,

ter Heijne

2023

J of Chemical Tech & Biotech

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BACKGROUNDIn biodesulphurisation processes, sulphide oxidising bacteria (SOB) convert toxic sulphide to sulphur. Haloalkalophilic SOB are known to anaerobically remove sulphide from solution and release electrons when subsequently exposed to an electrode. This makes SOB able to spatially decouple sulphide removal and current production, thereby acting as sulphide shuttles. Little is known about the kinetics of electron release by sulphide shuttling SOB. To gain more insight into the sulphide shuttling mechanism and electron release, current production of abiotic sulphide and sulphide shuttling SOB was compared.RESULTSSOB communities dominated by Thioalkalivibrio sulfidophilus were incubated with sulphide in batch experiments. After sulphide was removed, SOB were discharged in an electrochemical cell. Anode potential, sulphide load and biomass concentration were varied. Current was produced at potentials of −0.2 V versus Ag/AgCl and higher, and at a potential of 0.1 V a coulombic efficiency of 70% was reached in 30 min. The maximum charge recovered from biologically stored sulphide was 4900 ± 810 mC mgN−1. Discharge kinetics were not affected by biomass concentration or degree of sulphide removal and kinetics of biotic and abiotic current production were similar.CONCLUSIONCurrent production of sulphide shuttling SOB and abiotic sulphide was highly similar. This implies that sulphide shuttling is based on sorption to the biomass, and that shuttled sulphide converts to sulphur directly at the electrode surface. Therefore, the sulphide shuttling strategy is not sufficient to prevent electrode passivation, and different strategies need to be applied in the design of a sulphur‐producing bioelectrochemical desulphurisation process. © 2023 Society of Chemical Industry.

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Revealing cellular (poly)sulphide storage in electrochemically active sulphide oxidising bacteria using rotating disc electrodes

Linssen,

de Smit,

Röhring (neé Neubert)

et al. 2024

Bioelectrochemistry

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Effect of process conditions on the performance of a dual-reactor biodesulfurization process

Cited by 16 publications

References 37 publications

Bacteria Determine the Measured Oxidation Reduction Potential in the Biological Gas Desulfurization Process

Bacteria Determine the Measured Oxidation Reduction Potential in the Biological Gas Desulfurization Process

Electric discharge by sulphide shuttling bacteria

Revealing cellular (poly)sulphide storage in electrochemically active sulphide oxidising bacteria using rotating disc electrodes

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