Bacteria as an Electron Shuttle for Sulfide Oxidation

Heijne, Annemiek ter; Rink, Rieks de; Liu, Dandan; Klok, Johannes B.M.; Buisman, C.J.N.

doi:10.1021/acs.estlett.8b00319

Cited by 50 publications

(42 citation statements)

References 11 publications

(21 reference statements)

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“…Based on the difference between calculated and measured HS – concentrations, the specific HS – uptake in the anaerobic bioreactor was calculated (i.e., mg HS – per mg N of biomass (see Figure 2C). The specific HS – uptake in the anaerobic bioreactor was between 0.24 and 3.4 mg S/mg N, whereas ter Heijne 16 observed an HS – uptake of 0.22 mg S/mg N under anaerobic conditions in a batch experiment. The HS – uptake will be further discussed in Section 3.3.…”

Section: Resultssupporting

confidence: 89%

“…Recently, it has been shown that SOB taken from biodesulfurization systems, are capable of HS – uptake in the absence of oxygen. 16 Hence, it can be hypothesized that when SOB are exposed to elevated HS – levels in the anaerobic bioreactor, HS – concentration will be decreased and the HS – concentration in the influent of the aerobic bioreactor is lower. As a result, chemical oxidation rates in the aerated bioreactor will decrease and S 2 O 3 2– formation will be lower.…”

Section: Introductionmentioning

confidence: 99%

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Increasing the Selectivity for Sulfur Formation in Biological Gas Desulfurization

Rink

Klok²,

Heeringen³

et al. 2019

Environ. Sci. Technol.

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In the biotechnological desulfurization process under haloalkaline conditions, dihydrogen sulfide (H2S) is removed from sour gas and oxidized to elemental sulfur (S8) by sulfide-oxidizing bacteria. Besides S8, the byproducts sulfate (SO42–) and thiosulfate (S2O32–) are formed, which consume caustic and form a waste stream. The aim of this study was to increase selectivity toward S8 by a new process line-up for biological gas desulfurization, applying two bioreactors with different substrate conditions (i.e., sulfidic and microaerophilic), instead of one (i.e., microaerophilic). A 111-day continuous test, mimicking full scale operation, demonstrated that S8 formation was 96.6% on a molar H2S supply basis; selectivity for SO42– and S2O32– were 1.4 and 2.0% respectively. The selectivity for S8 formation in a control experiment with the conventional 1-bioreactor line-up was 75.6 mol %. At start-up, the new process line-up immediately achieved lower SO42– and S2O32– formations compared to the 1-bioreactor line-up. When the microbial community adapted over time, it was observed that SO42– formation further decreased. In addition, chemical formation of S2O32– was reduced due to biologically mediated removal of sulfide from the process solution in the anaerobic bioreactor. The increased selectivity for S8 formation will result in 90% reduction in caustic consumption and waste stream formation compared to the 1-bioreactor line-up.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Increasing the Selectivity for Sulfur Formation in Biological Gas Desulfurization

Rink

Klok²,

Heeringen³

et al. 2019

Environ. Sci. Technol.

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“…Hence, the global recovery of the current reached 27% ± 4%, which means that a high amount of current was probably lost in parasitic reactions in the reductive reactor, such as in the hydrogen shortcut between the cathode and the anode or in the presence of bioelectrochemical oxidation of the ammonium nitrogen and the sulfide present in the mineral medium. In more detail, in the inner counterelectrode part of the reductive reactor, both ammonium nitrogen and sulfide could be bioelectrochemically oxidized into nitrate and elemental sulfur, respectively, as has been reported in the literature [42][43][44]. Even though the anion determination did not show the presence of nitrate or sulfide removal, the presence of bioelectrochemical oxidation cannot be excluded due to the possibility of an oxidation/reduction electron loop; therefore, the contribution of each mechanism could not be quantified in the electron balance of the process.…”

Section: Continuous Flow Operation Of the Sequential Oxidative/reductmentioning

confidence: 63%

Reductive/Oxidative Sequential Bioelectrochemical Process for Perchloroethylene Removal

Zeppilli

Dell’Armi

Cristiani

et al. 2019

Water

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An innovative bioelectrochemical reductive/oxidative sequential process was developed and tested on a laboratory scale to obtain the complete mineralization of perchloroethylene (PCE) in a synthetic medium. The sequential bioelectrochemical process consisted of two separate tubular bioelectrochemical reactors that adopted a novel reactor configuration, avoiding the use of an ion exchange membrane to separate the anodic and cathodic chamber and reducing the cost of the reactor. In the reductive reactor, a dechlorinating mixed inoculum received reducing power to perform the reductive dechlorination of perchloroethylene (PCE) through a cathode chamber, while the less chlorinated daughter products were removed in the oxidative reactor, which supported an aerobic dechlorinating culture through in situ electrochemical oxygen evolution. Preliminary fluid dynamics and electrochemical tests were performed to characterize both the reductive and oxidative reactors, which were electrically independent of each other, with each having its own counterelectrode. The first continuous-flow potentiostatic run with the reductive reactor (polarized at −450 mV vs SHE) resulted in obtaining 100% ± 1% removal efficiency of the influent PCE, while the oxidative reactor (polarized at +1.4 V vs SHE) oxidized the vinyl chloride and ethylene from the reductive reactor, with removal efficiencies of 100% ± 2% and 92% ± 1%, respectively.

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“…Microorganism could transfer the electrons to the humic substances, then the reduces humic substances can rapidly reduces iron (III) oxides (Roden et al, 2010). The self-charge and storage capability could also be quinone based compounds (ter Heijne et al, 2018). The anode potential drop was much higher with pure marine sediment bioanodes (more than 300 mV) than the AC based electrode.…”

Section: Resultsmentioning

confidence: 99%

Marine Sediment Mixed With Activated Carbon Allows Electricity Production and Storage From Internal and External Energy Sources: A New Rechargeable Bio-Battery With Bi-Directional Electron Transfer Properties

2019

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Marine sediment has a great potential to generate electricity with a bioelectrochemical system (BES) like the microbial fuel cell (MFC). In this study, we investigated the potential of marine sediment and activated carbon (AC) to generate and store electricity. Both internal and external energy supply was validated for storage behavior. Four types of anode electrode compositions were investigated. Two types were mixtures of different volumes of AC and Dutch Eastern Scheldt marine sediment (67% AC and 33% AC) and the others two were 100% AC or 100% marine sediment based. Each composition was duplicated. Operating these BES’s under MFC mode with solely marine sediment as the anode electron donor resulted in the creation of a bio-battery. The recharge time of such bio-battery does depend on the fuel content and its usage. The results show that by usage of marine sediment and AC electricity was generated and stored. The 100% AC and the 67% AC mixed with marine sediment electrode were over long term potentiostatic controlled at -100 mV vs. Ag/AgCl which resulted in a cathodic current and an applied voltage. After switching back to the MFC operation mode at 1000 Ω external load, the electrode turned into an anode and electricity was generated. This supports the hypothesis that external supply electrical energy was recovered via bi-directional electron transfer. With open cell voltage experiments these AC marine bioanodes showed internal supplied electric charge storage up to 100 mC at short self-charging times (10 and 60 s) and up to 2.4°C (3,666 C/m 3 anode) at long charging time (1 h). Using a hypothetical cell voltage of 0.2 V, this value represents an internal electrical storage density of 0.3 mWh/kg AC marine anode. Furthermore it was remarkable that the BES with 100% marine sediment based electrode also acted like a capacitor similar to the charge storage behaviors of the AC based bioanodes with a maximum volumetric storage of 1,373 C/m 3 anode. These insights give opportunities to apply such BES systems as e.g., ex situ bio-battery to store and use electricity for off-grid purpose in remote areas.

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Bacteria as an Electron Shuttle for Sulfide Oxidation

Cited by 50 publications

References 11 publications

Increasing the Selectivity for Sulfur Formation in Biological Gas Desulfurization

Increasing the Selectivity for Sulfur Formation in Biological Gas Desulfurization

Reductive/Oxidative Sequential Bioelectrochemical Process for Perchloroethylene Removal

Marine Sediment Mixed With Activated Carbon Allows Electricity Production and Storage From Internal and External Energy Sources: A New Rechargeable Bio-Battery With Bi-Directional Electron Transfer Properties

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