Optimization of Oxygen Transfer through Membrane Diffusers for Biological Sweetening of Biogas

Rodriguez, Ginesta; Dorado, Antonio David; Bonsfills, Anna; Gabriel, David; Gamisans, Xavier

doi:10.1002/ceat.201200603

Cited by 8 publications

(6 citation statements)

References 50 publications

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“…Thiosulfate was measured and considered in the equations in order to close sulfur mass balances, however, concentrations measured were below detection limit in all samples. In contrast to most works in which the system is characterized as a function of the O 2 supplied, the

{EC}_{H_{2} normalS}

{CC}_{O_{2}}

ratio provides useful information to understand the profitability of the system in O 2 usage to remove H 2 S and to further visualize the influence of TLV in process stoichiometry. Results during constant TLV and variable TLV experiments are shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…TLV was varied in the typical range of liquid velocity in biotrickling filters while the GFR range was decided based on previous literature . Experiments allowed studying the effect on the standard oxygen transfer efficiency (SOTE) and on the standard oxygen transfer rate (SOTR), which were determined according to ASCE/EWRI 2–06 and further detailed in Rodriguez et al …”

Section: Methodsmentioning

confidence: 99%

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Influence of trickling liquid velocity and flow pattern in the improvement of oxygen transport in aerobic biotrickling filters for biogas desulfurization

López

Bezerra

Mora

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND: Biological oxidation in biotrickling filters of high H 2 S loads contained in biogas streams still requires further study to reduce elemental sulfur accumulation due to limited gas-liquid oxygen mass transfer inside biotrickling filter beds.Reduction of elemental sulfur accumulation may be improved by regulating the main manipulated variables related to oxygen mass transfer efficiency during biological hydrogen sulfide removal in biotrickling filters. RESULTS: Trickling liquid velocity and co-current flow were selected as the most appropriate manipulated variable and flow pattern configuration compared with manipulating the air supply flow rate and a counter-current flow pattern in order to improve gas-liquid oxygen mass transfer in abiotic conditions. The influence of trickling liquid velocity on the performance of a lab-scale biotrickling filter treating high loads of H 2 S in a biogas mimic and operating in co-current flow at neutral pH and packed with plastic pall rings was investigated.CONCLUSIONS: The effect of trickling liquid velocity modulation between 4.4 and 18.9 m h −1 in biotrickling filter performance was compared with operation without trickling liquid velocity regulation. Velocity regulation resulted in an improvement of 10% in the elimination capacity and, most importantly, a 9% increase in product selectivity to sulfate at a loading rate of 283.8 g S-H 2 S m −3 h −1 . Concentration profiles along the biotrickling filter height evidenced that trickling liquid velocity regulation progressively led to better dissolved oxygen distribution and, thus, enhanced overall biotrickling filter performance.

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{EC}_{H_{2} normalS}

{CC}_{O_{2}}

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Influence of trickling liquid velocity and flow pattern in the improvement of oxygen transport in aerobic biotrickling filters for biogas desulfurization

López

Bezerra

Mora

et al. 2015

J of Chemical Tech & Biotech

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“…The mechanisms identified here resulting in improved treatment suggest promising application of engineering the hydrophobicity of the coating surface in contact with the gas phase of composite bioactive latex coatings for the treatment of highly hydrophobic compounds such as hexane ( H = 74) or CH 4 ( H = 34). The approach also has potential for enhancing oxygen mass transfer, which should be relevant to the treatment of hydrophilic pollutants or in bioprocesses for biogas sweetening, where oxygen transfer is often rate limiting (Deshusses and Johnson, ; Rodriguez et al, ).…”

Section: Resultsmentioning

confidence: 99%

Biocatalytic coatings for air pollution control: A proof of concept study on VOC biodegradation

Estrada

Bernal

Flickinger

et al. 2014

Biotech & Bioengineering

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Although biofilm-based biotechnologies exhibit a large potential as solutions for off-gas treatment, the high water content of biofilms often causes pollutant mass transfer limitations, which ultimately limit their widespread application. The present study reports on the proof of concept of the applicability of bioactive latex coatings for air pollution control. Toluene vapors served as a model volatile organic compound (VOC). The results showed that Pseudomonas putida F1 cells could be successfully entrapped in nanoporous latex coatings while preserving their toluene degradation activity. Bioactive latex coatings exhibited toluene specific biodegradation rates 10 times higher than agarose-based biofilms, because the thin coatings were less subject to diffusional mass transfer limitations. Drying and pollutant starvation were identified as key factors inducing a gradual deterioration of the biodegradation capacity in these innovative coatings. This study constitutes the first application of bioactive latex coatings for VOC abatement. These coatings could become promising means for air pollution control.

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“…As a result, mass transfer limitations can arise when treating hydrophobic pollutants or when the VOCs are present at trace level concentrations, hindering the abatement performance of BTFs . Likewise, oxygen can become limiting when treating high loading rates of readily water‐soluble pollutants, thus reducing the abatement capacity of the bioreactor . Despite mass transfer aspects being of paramount relevance in bioreactor design and operation, data available on mass transfer coefficients in BTFs are scarce and the experimental procedures used for these determinations are often tedious and prone to experimental errors.…”

Section: Introductionmentioning

confidence: 99%

Fundamental study on gas–liquid mass transfer in a biotrickling filter packed with polyurethane foam

Estrada

Dudek

Muñoz

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND: Biotrickling filtration is one of the most promising biotechnologies for off-gas treatment. However, gas-liquid mass transfer limitations constitute the most important drawback of biotrickling filters (BTFs) when treating hydrophobic pollutants. Oxygen limitations might also arise when treating soluble pollutants at high loading rates. In the present study, an easy-to-implement method for mass transfer characterization in BTFs based on dissolved oxygen measurements was investigated.RESULTS: k L a values for oxygen in the range 30-300 h −1 were obtained by fitting the experimental data to a mathematical model with high correlation coefficients (average r 2 = 0.995). In addition, the k L a values for other gas pollutants of industrial and environmental interest (NH 3 , H 2 S, toluene and hexane) were estimated by means of an empirical correlation, which allowed calculation of their mass transfer rates in order to identify potential mass transfer limiting scenarios. CONCLUSIONS: The methodology proposed allowed for a rapid, easy and accurate determination of the k L a for oxygen under varied operational conditions, the mass transfer data obtained being in agreement with previous literature. The experimental k L a data obtained for oxygen and the methodology applied for the estimation of k L a for the target gaseous pollutants selected constitutes a valuable tool for the optimization, design and operation of BTFs.

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Optimization of Oxygen Transfer through Membrane Diffusers for Biological Sweetening of Biogas

Cited by 8 publications

References 50 publications

Influence of trickling liquid velocity and flow pattern in the improvement of oxygen transport in aerobic biotrickling filters for biogas desulfurization

Influence of trickling liquid velocity and flow pattern in the improvement of oxygen transport in aerobic biotrickling filters for biogas desulfurization

Biocatalytic coatings for air pollution control: A proof of concept study on VOC biodegradation

Fundamental study on gas–liquid mass transfer in a biotrickling filter packed with polyurethane foam

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