Influence of methanethiol on biological sulphide oxidation in gas treatment system

Roman, Pawel; Bijmans, Martijn F.M.; Janssen, A.J.H.

doi:10.1080/09593330.2015.1128001

Cited by 22 publications

(28 citation statements)

References 33 publications

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“… 15 Gaseous compounds were determined by gas chromatography. 16 Sodium was measured by ion chromatography. 17 VSS measurements were performed in the same way as before.…”

Section: Methodsmentioning

confidence: 99%

Effect of n-Caproate Concentration on Chain Elongation and Competing Processes

Roghair

Liu

Adiatma

et al. 2018

ACS Sustainable Chem. Eng.

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Chain elongation is an open-culture fermentation process that facilitates conversion of organic residues with an additional electron donor, such as ethanol, into valuable n-caproate. Open-culture processes are catalyzed by an undefined consortium of microorganisms which typically also bring undesired (competing) processes. Inhibition of competing processes, such as syntrophic ethanol oxidation, will lead to a more selective n-caproate production process. In this study, we investigated the effect of n-caproate concentration on the specific activity of chain elongation and competing processes using batch inhibition assays. With “synthetic medium sludge” (originally operating at 3.4 g/L n-caproate), syntrophic ethanol oxidation was proportionally inhibited by n-caproate until 45% inhibition at 20 g/L n-caproate. Hydrogenotrophic methanogenesis was for 58% inhibited at 20 g/L n-caproate. Chain elongation of volatile fatty acids (volatile fatty acid upgrading; the desired process), was completely inhibited at 20 g/L n-caproate with all tested sludge types. “Adapted sludge” (operating at 23.2 g/L n-caproate) showed a 10 times higher volatile fatty acid upgrading activity at 15 g/L n-caproate compared to “nonadapted sludge” (operating at 7.1 g/L n-caproate). This shows that open cultures do adapt to perform chain elongation at high n-caproate concentrations which likely inhibits syntrophic ethanol oxidation through hydrogenotrophic methanogenesis. As such, we provide supporting evidence that the formation of n-caproate inhibits syntrophic ethanol oxidation which leads to a more selective medium chain fatty acid production process.

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“… 15 Gaseous compounds were determined by gas chromatography. 16 Sodium was measured by ion chromatography. 17 VSS measurements were performed in the same way as before.…”

Section: Methodsmentioning

confidence: 99%

Effect of n-Caproate Concentration on Chain Elongation and Competing Processes

Roghair

Liu

Adiatma

et al. 2018

ACS Sustainable Chem. Eng.

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“…Biodesulfurization systems that produce elemental sulfur operated under haloalkaline conditions have been studied and applied for more than 25 years [1,2]. The efficiency of converting sulfide to elemental sulfur in laboratory experiments is close to 97% [2] and models suggest that 98% efficiency is possible [3,4]. The remaining part of the sulfide is biologically oxidized to sulfate or chemically to thiosulfate.…”

Section: Introductionmentioning

confidence: 99%

Syngas as Electron Donor for Sulfate and Thiosulfate Reducing Haloalkaliphilic Microorganisms in a Gas-Lift Bioreactor

et al. 2020

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Biodesulfurization processes remove toxic and corrosive hydrogen sulfide from gas streams (e.g., natural gas, biogas, or syngas). To improve the efficiency of these processes under haloalkaline conditions, a sulfate and thiosulfate reduction step can be included. The use of H2/CO mixtures (as in syngas) instead of pure H2 was tested to investigate the potential cost reduction of the electron donor required. Syngas is produced in the gas-reforming process and consists mainly of H2, carbon monoxide (CO), and carbon dioxide (CO2). Purification of syngas to obtain pure H2 implies higher costs because of additional post-treatment. Therefore, the use of syngas has merit in the biodesulfurization process. Initially, CO inhibited hydrogen-dependent sulfate reduction. However, after 30 days the biomass was adapted and both H2 and CO were used as electron donors. First, formate was produced, followed by sulfate and thiosulfate reduction, and later in the reactor run acetate and methane were detected. Sulfide production rates with sulfate and thiosulfate after adaptation were comparable with previously described rates with only hydrogen. The addition of CO marginally affected the microbial community in which Tindallia sp. was dominant. Over time, acetate production increased and acetogenesis became the dominant process in the bioreactor. Around 50% of H2/CO was converted to acetate. Acetate supported biomass growth and higher biomass concentrations were reached compared to bioreactors without CO feed. Finally, CO addition resulted in the formation of small, compact microbial aggregates. This suggests that CO or syngas can be used to stimulate aggregation in haloalkaline biodesulfurization systems.

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“…MCFA production started on day 7. A er 84 days a steady state was reached and maintained for 27 days (day 84-97 and day [105][106][107][108][109][110][111][112][113][114][115][116][117][118][119]. In this period the main MCFAs produced were caproate (10.8 ± 0.5 g•L -1 •d -1 ) and heptanoate (1.8 ± 0.1 g•L -1 •d -1 ) at concentrations of 7.4 ± 0.2 g•L -1 and 1.2 ± 0.1 g•L -1 respectively.…”

Section: First Observation Of Granular Sludge Formationmentioning

confidence: 99%

“…Alcohols (C2-C6) and fatty acids (C2-C8) were analyzed by gas chromatography [105]. Gaseous compounds were determined by gas chromatography [106]. Sodium was measured by ion chromatography [107].…”

Section: Analytical Techniquesmentioning

confidence: 99%

Control strategies for ethanol-based chain elongation processes

Roghair¹

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CHAPTER 1 General Introduction 1.1 Biomass residues as alternative resource for fuels and chemicals 1.2 Feedstock composition determines which conversion route is suitable 1.3 MCFA production from wet residual biomass through anaerobic open-culture chain elongation 1.4 Challenges in ethanol-based chain elongation; controlling competing processes 1.5 Goals and thesis outline CHAPTER 2 Granular Sludge Formation and Characterization in a Chain Elongation Process Abstract 2.1 Introduction 2.2 Materials and methods 2.3 Results and discussion 2.5 Supporting Information CHAPTER 3 Controlling Ethanol Use in Chain Elongation by CO 2 Loading Rate CHAPTER 6 General Discussion 6.1 What we did in this thesis and why 6.2 Research outcomes and implications 6.3 Overview of control strategies for chain elongation with open cultures 6.4 Scenarios that may undermine control strategies 6.5 One third of total consumed ethanol is inevitably used for ethanol upgrading 6.6 Outlook 6.7 Concluding remarks References Curriculum vitae Acknowledgements List of publications 9

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Influence of methanethiol on biological sulphide oxidation in gas treatment system

Cited by 22 publications

References 33 publications

Effect of n-Caproate Concentration on Chain Elongation and Competing Processes

Effect of n-Caproate Concentration on Chain Elongation and Competing Processes

Syngas as Electron Donor for Sulfate and Thiosulfate Reducing Haloalkaliphilic Microorganisms in a Gas-Lift Bioreactor

Control strategies for ethanol-based chain elongation processes

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