Biotrickling filters for biogas sweetening: Oxygen transfer improvement for a reliable operation

Rodriguez, Ginesta; Dorado, Antonio David; Fortuny, Marc; Gabriel, David; Gamisans, Xavier

doi:10.1016/j.psep.2013.02.002

Cited by 84 publications

(61 citation statements)

References 18 publications

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“…In case of higher H2S concentrations, similar RE cannot be expected (Rodriguez et al, 2014). Based on the literature review performed, it can be inferred that when increasing EBRT is impossible due to reactor volume limitations, maintaining the recirculation velocity at optimum points can help to compensate for lower retention times.…”

Section: Impact Of Empty Bed Retention Time (Ebrt) On Process Performmentioning

confidence: 93%

“…This technology has been tested at industrial-scale and proved to be successful especially at moderate-low H2S concentrations up to 12,000 ppm (Fortun et al, 2008; Tomàs et al, 2009). However, there are still some problematic issues such as the production of byproducts, i.e., elemental sulfur, and their associated clogging problems, which require further investigations (Burgess et al, 2001;Rodriguez et al, 2014).…”

Section: Biotrickling Filtration (Btf)mentioning

confidence: 99%

“…If a high supply of oxygen is provided, the biomethane will be so diluted (Chaiprapat et al, 2011). To solve such a problem, Rodriguez et al (2014) proposed to supply dissolved oxygen (DO) through recirculating a liquid coming in contact with the biogas stream. Under such circumstances, liquid recirculation velocity (q, m 3 m -2 h -1 ), i.e., the amount of recirculating liquid applied per unit surface area of the bed materials, is a determinant factor.…”

Section: Oxygen Availability and Mass Transfermentioning

confidence: 99%

“…For instance, Rodriguez et al (2014) in their research study, performed on a full-scale desulfurization plant, compared a conventional diffuser (blower) with a Venturi-based device. They found out that the jet-Venturi offered a lower airflow rate of 5.6 ± 3.8 m 3 h −1 compared with 22.1 ± 5.7 m 3 h −1 by the conventional diffuser.…”

Section: Impact Of Diffuser Type On Biological Removalmentioning

confidence: 99%

“…Moreover, the combustion of these types of fuels results in the corrosion of engines and fast degradation of engine lube oil. The recommended level of H2S in the produced biogas is in the range of 0.02 to 0.05% (w/w) (200 to 500 ppm) while H2S-free biogas is more desirable (Rodriguez al., 2014).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A review on prospects and challenges of biological H2S removal from biogas with focus on biotrickling filtration and microaerobic desulfurization

et al. 2017

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Section: Impact Of Empty Bed Retention Time (Ebrt) On Process Performmentioning

confidence: 93%

Section: Biotrickling Filtration (Btf)mentioning

confidence: 99%

Section: Oxygen Availability and Mass Transfermentioning

confidence: 99%

Section: Impact Of Diffuser Type On Biological Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A review on prospects and challenges of biological H2S removal from biogas with focus on biotrickling filtration and microaerobic desulfurization

et al. 2017

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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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Modeling and control strategies for anoxic biotrickling filtration in biogas purification

Almenglo

Ramírez

Gómez

et al. 2015

J of Chemical Tech & Biotech

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A dynamic model has been developed to describe the performance of an anoxic biotrickling filter for biogas desulfurization. The model considers the most relevant phenomena involved in the biotrickling filter operation: convection, absorption, diffusion and biodegradation. The model also considers that a fraction of the liquid phase is stagnant -an assumption that increases the importance of diffusion phenomena for low liquid flow rates. The model was calibrated and validated using experimental data from a pilot-scale plant installed in a WWTP. In the calibration stage a set of periods with a wide range of operating conditions was used; i.e., biogas flow rate in the range 1-5 m 3 h −1 , recirculation flow rate in the range 1-3 m 3 h −1 , and nitrate concentration in the range 1-423 gN−NO3 -m −3 . The predictions obtained on using the model were consistent with experimental data and the divergence was less than 2%.The model was subsequently validated using two faultless periods (recirculation flow rates of 1.5 and 3 m 3 h −1, biogas flow rate in the range 1-5.2 m 3 h −1 , and inlet H2Sconcentration steps in the range 3600-5500 ppmV). An ANOVA study was carried out in order to quantify the suitability of the predictions. The results indicated that the differences between experimental and simulated outlet H2S concentrations were not statistically significant. The model was also able to predict simultaneously the dynamic concentrations of sulfide and nitrate in the liquid phase. Once the model had been validated, six control strategies were analyzed for different scenarios and purposes:i.e., to minimize the nitrate consumption and/or to maximize the H2S removal efficiency. The developed model is a potential tool to enhance and optimize the performance of biotrickling filters for the anoxic removal of H2S.3

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Biotrickling filters for biogas sweetening: Oxygen transfer improvement for a reliable operation

Cited by 84 publications

References 18 publications

A review on prospects and challenges of biological H2S removal from biogas with focus on biotrickling filtration and microaerobic desulfurization

A review on prospects and challenges of biological H2S removal from biogas with focus on biotrickling filtration and microaerobic desulfurization

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

Modeling and control strategies for anoxic biotrickling filtration in biogas purification

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