Removal of <i>n</i>-Butyl Mercaptan Using Stripping with an Inert Gas:  A Nonequilibrium Approach via Mass Balances

Matsis, Vasileios; Georgantas, D.A.; Grigoropoulou, H.

doi:10.1021/ie050882g

Cited by 7 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The VOSC concentrations in the bioreactor decreased with increased flow rate of N 2 (Figure A–C) and showed that thiols can be effectively stripped by applying a low volumetric flow rate of an inert gas. Moreover, it can be observed that the sum of VOSCs in the bioreactor headspace decreased with increasing thiol hydrophobicity (Figure A–C) …”

Section: Results and Discussionmentioning

confidence: 95%

“…Moreover, it can be observed that the sum of VOSCs in the bioreactor headspace decreased with increasing thiol hydrophobicity (Figure 3A− C). 33 A lower selectivity for sulfur production was found at higher VOSC concentrations. Probably this resulted from the inhibitory effects of VOSCs on the overall biological sulfide oxidation rate 12,19 which in turn, leads to an increasing abiotic formation of polysulfide anions causing spontaneous thiosulfate formation.…”

Section: Resultsmentioning

confidence: 97%

“…In all experiments (Table 2), H 2 S was almost completely absorbed from the inlet gas stream (99.829 ± 0.007%) while the scrubbing efficiency of MT, ET, and PT was around 69 ± 4%, 65 ± 2%, and 44 ± 2%, respectively. The difference in scrubbing efficiencies between H 2 S and thiols resulted from a higher solubility of H 2 S. 33 To assess the effect of stripping of thiols on the bioreactor performance nitrogen gas was continuously added to the bioreactor suspension (Figure 1). In full-scale installations, with open bioreactors without air recycling a similar effect will occur.…”

Section: Resultsmentioning

confidence: 99%

“…In all experiments (Table ), H 2 S was almost completely absorbed from the inlet gas stream (99.829 ± 0.007%) while the scrubbing efficiency of MT, ET, and PT was around 69 ± 4%, 65 ± 2%, and 44 ± 2%, respectively. The difference in scrubbing efficiencies between H 2 S and thiols resulted from a higher solubility of H 2 S …”

Section: Results and Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Selection and Application of Sulfide Oxidizing Microorganisms Able to Withstand Thiols in Gas Biodesulfurization Systems

Roman

Klok²,

Sousa

et al. 2016

Environ. Sci. Technol.

View full text Add to dashboard Cite

After the first commercial applications of a new biological process for the removal of hydrogen sulfide (HS) from low pressure biogas, the need arose to broaden the operating window to also enable the removal of organosulfur compounds from high pressure sour gases. In this study we have selected microorganisms from a full-scale biodesulfurization system that are capable of withstanding the presence of thiols. This full-scale unit has been in stable operation for more than 10 years. We investigated the microbial community by using high-throughput sequencing of 16S rRNA gene amplicons which showed that methanethiol gave a competitive advantage to bacteria belonging to the genera Thioalkalibacter (Halothiobacillaceae family) and Alkalilimnicola (Ectothiorhosdospiraceae family). The sulfide-oxidizing potential of the acclimatized population was investigated under elevated thiol loading rates (4.5-9.1 mM d), consisting of a mix of methanethiol, ethanethiol, and propanethiol. With this biomass, it was possible to achieve a stable bioreactor operation at which 80% of the supplied HS (61 mM d) was biologically oxidized to elemental sulfur. The remainder was chemically produced thiosulfate. Moreover, we found that a conventionally applied method for controlling the oxygen supply to the bioreactor, that is, by maintaining a redox potential set-point value, appeared to be ineffective in the presence of thiols.

show abstract

Section: Results and Discussionmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Selection and Application of Sulfide Oxidizing Microorganisms Able to Withstand Thiols in Gas Biodesulfurization Systems

Roman

Klok²,

Sousa

et al. 2016

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The nonequilibrium unsteady-state mass balance model includes mass balance in liquid phase of neutral and ionic form of n-butyl mercaptan, electroneutrality condition, water equilibrium in liquid and gas phase and a set of initial conditions. This model is described in detail elsewhere [7].…”

Section: Mathematical Model Of the Stripping System Based On Mass Balmentioning

confidence: 99%

Aeration / Stripping of n-Butyl Mercaptan in aqueous environment

2013

Global NEST Journal

View full text Add to dashboard Cite

ABSTRACTΜany applications in water quality management have a common key water quality parameter, dissolved oxygen, resulting to the critical role of aeration. On the other hand, in municipal and industrial wastewater, especially where aeration is applied, the presence of volatile organic compounds (VOCs) causes several concerns including a direct threat to humans, partly due to their emission from treatment tanks. pH, temperature and Henry's Law govern VOCs' speciation and consequently their emission characteristics. Limited data and simplifications of available mass-transfer models pose obstacles to a realistic approach, especially in the presence of a chemical equilibrium, for example in the case of mercaptans. In the present study the importance of oxygen transfer and stripping of a VOC (n-butyl mercaptan) on aeration's overall effectiveness are examined separately. Clean water oxygenation and stripping of mercaptan to an inert gas (nitrogen) were studied aiming to consider mass transfer aspects and to investigate the influence of chemical equilibrium between ionic and neutral form of the target compound in neutral and alkaline solutions. Using appropriate mass transfer relationships (dynamic method), experimental data were analyzed for the determination of overall mass transfer coefficient ( A coupled differential algebraic equation system, based on mass balances, taking into account dissociation of the compound to be stripped and assuming chemical non-equilibrium conditions during stripping, was developed. Reaction parameter k 2 was calculated with non-linear least-squares analysis. The model predicts satisfactorily the experimental data and it provides a useful tool for the semibatch stripper design in situations where a reversible reaction is involved. At pH values below 8.5 mercaptan concentration falls exponentially whereas above 10.5 it tends to linearity. The bubble equilibrates and mercaptan transferred depends upon solubility and not diffusivity. Especially after depletion of initial neutral compound, transport depends upon neutral/ionic form speciation. The effectiveness of stripping n-butyl mercaptan, at a given pH, is mainly determined by a proportionality constant considered as "fugacity capacity" (removal effect on the process) and by a reversible reaction rate constant k 2 (kinetic effect on the process). The ''fugacity capacity" is determined by hydrophobicity (i.e. low solubility and high limiting activity coefficient) rather than pure-component volatility (i.e. vapor pressure or boiling point). High limiting activity coefficient promotes mercaptan emission due to established vapor-liquid equilibrium, while the low reaction parameter k 2 , controls neutral compound quantity. At high pH, where ionic form predominates, experimental data showed that stripping was almost independent of the gas flow rate applied. A strong sensitivity of the model to uncertainty of γ ∞ MATSIS et al. 104was found: γ ∞ controls emission rate and through this the dynamic variations of neutral/ionic concentration prof...

show abstract

PTS in Aquatic Environment

Wang

Sun

et al. 2018

Persistent Toxic Substances Monitoring

View full text Add to dashboard Cite

Removal of n-Butyl Mercaptan Using Stripping with an Inert Gas: A Nonequilibrium Approach via Mass Balances

Cited by 7 publications

References 9 publications

Selection and Application of Sulfide Oxidizing Microorganisms Able to Withstand Thiols in Gas Biodesulfurization Systems

Selection and Application of Sulfide Oxidizing Microorganisms Able to Withstand Thiols in Gas Biodesulfurization Systems

Aeration / Stripping of n-Butyl Mercaptan in aqueous environment

PTS in Aquatic Environment

Contact Info

Product

Resources

About