Progressive change from nitrate to nitrite as the electron acceptor for the oxidation of H2S under feedback control in an anoxic biotrickling filter

Brito, Javier; Valle, Antonio; Almenglo, Fernando; Ramírez, Martín; Cantero, Domingo

doi:10.1016/j.bej.2018.08.017

Cited by 27 publications

(19 citation statements)

References 33 publications

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“…Thiohalophilus sp. is an SOB that has been isolated under microoxic conditions and found to be capable of sulfur-driven anaerobic growth with NO [111]. Although the bacteria were not identified, the authors report that the bacterial diversity was reduced during the progressive adaptation from NO 3 − to NO 2 − , however the DGGE banding patterns were similar, indicating that the same bacterial community was involved in sulfur-driven autotrophic denitrification with both electron acceptors.…”

Section: Anoxic Biofiltrationmentioning

confidence: 99%

Microbial Ecology of Biofiltration Units Used for the Desulfurization of Biogas

Borgne

Baquerizo

2019

ChemEngineering

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Bacterial communities’ composition, activity and robustness determines the effectiveness of biofiltration units for the desulfurization of biogas. It is therefore important to get a better understanding of the bacterial communities that coexist in biofiltration units under different operational conditions for the removal of H2S, the main reduced sulfur compound to eliminate in biogas. This review presents the main characteristics of sulfur-oxidizing chemotrophic bacteria that are the base of the biological transformation of H2S to innocuous products in biofilters. A survey of the existing biofiltration technologies in relation to H2S elimination is then presented followed by a review of the microbial ecology studies performed to date on biotrickling filter units for the treatment of H2S in biogas under aerobic and anoxic conditions.

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Section: Anoxic Biofiltrationmentioning

confidence: 99%

Microbial Ecology of Biofiltration Units Used for the Desulfurization of Biogas

Borgne

Baquerizo

2019

ChemEngineering

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“…Combinations of organic and inorganic materials have also been studied, pursuing the addition of the nutritional properties of the organic materials and the mechanical properties of the inorganic compounds [76]. Polymeric materials such as polyethylene [39], polypropylene [23], plastic rings, and polyurethane foam [18] have also been used, offering advantages such as a high specific area and characteristics of hydrophobic afiinity with the attached microorganisms.…”

Section: Anoxic Btf Packing Materials For Biogas Desulphurisationmentioning

confidence: 99%

“…In some cases only H 2 S inlet and outlet concentrations of the biofilter or BTF were reported, without taking into account the type and concentration of microorganisms that performed the degradation, as described in the Table 2, in the research items 8, 9, 13, 14, and 15. For example, Brito et al (2018) evaluated the change of nitrate (NO 3 − ) to nitrite (NO 2 − ) as electron acceptors in BTFs for H 2 S removal, only reporting the outlet H 2 S concentration (15 ppm v ), describing loading rates (LR) from 7-69 g m −3 h −1 . However, it would be more insightful to have a performance comparison on critical and maximal elimination capacities (ECs) and their respective removal efficiencies (REs), specifically if the LRs was given [23].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Brito et al (2018) evaluated the change of nitrate (NO 3 − ) to nitrite (NO 2 − ) as electron acceptors in BTFs for H 2 S removal, only reporting the outlet H 2 S concentration (15 ppm v ), describing loading rates (LR) from 7-69 g m −3 h −1 . However, it would be more insightful to have a performance comparison on critical and maximal elimination capacities (ECs) and their respective removal efficiencies (REs), specifically if the LRs was given [23]. In other cases, different operational conditions of the BTFs were compared through the indicators' removal efficiencies (REs), empty bed residence times (EBRTs), ECs, and H 2 S LRs, as described in the Table 2, in the research items 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 16, 17, and 18.…”

Section: Introductionmentioning

confidence: 99%

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Markers for the Comparison of the Performances of Anoxic Biotrickling Filters in Biogas Desulphurisation: A Critical Review

et al. 2021

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The agriculture and livestock industry generate waste used in anaerobic digestion to produce biogas containing methane (CH4), useful in the generation of electricity and heat. However, although biogas is mainly composed of CH4 (~65%) and CO2 (~34%), among the 1% of other compounds present is hydrogen sulphide (H2S) which deteriorates engines and power generation fuel cells that use biogas, generating a foul smell and contaminating the environment. As a solution to this, anoxic biofiltration, specifically with biotrickling filters (BTFs), stands out in terms of the elimination of H2S as it is cost-effective, efficient, and more environmentally friendly than chemical solutions. Research on the topic is uneven in terms of presenting performance markers, underestimating many microbiological indicators. Research from the last decade was analyzed (2010–2020), demonstrating that only 56% of the reviewed publications did not report microbiological analysis related to sulphur oxidising bacteria (SOB), the most important microbial group in desulphurisation BTFs. This exposes fundamental deficiencies within this type of research and difficulties in comparing performance between research works. In this review, traditional and microbiological performance markers of anoxic biofiltration to remove H2S are described. Additionally, an analysis to assess the efficiency of anoxic BTFs for biogas desulphurisation is proposed in order to have a complete and uniform assessment for research in this field.

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“…A higher TLV level supplies a higher nitrate availability in the biofilm. TLV has usually been kept constant in anoxic BTFs between 10 [22] and 15 [23] m·h −1 , but for a high H 2 S IL it would be interesting to study the effect of this parameter. As in aerobic BTFs, where TLV is a key operational variable, in aerobic BTFs the regulation of TLV improves the oxygen mass transfer along the packed bed [24].…”

Section: Empirical Modelmentioning

confidence: 99%

Application of Response Surface Methodology for H2S Removal from Biogas by a Pilot Anoxic Biotrickling Filter

2019

Self Cite

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In this study, a pilot biotrickling filter (BTF) was installed in a wastewater treatment plant to treat real biogas. The biogas flow rate was between 1 and 5 m 3 ·h −1 with an H 2 S inlet load (IL) between 35.1 and 172.4 gS·m −3 ·h −1 . The effects of the biogas flow rate, trickling liquid velocity (TLV) and nitrate concentration on the outlet H 2 S concentration and elimination capacity (EC) were studied using a full factorial design (3 3 ). Moreover, the results were adjusted using Ottengraf's model. The most influential factors in the empirical model were the TLV and H 2 S IL, whereas the nitrate concentration had less influence. The statistical results showed high predictability and good correlation between models and the experimental results. The R-squared was 95.77% and 99.63% for the 'C model' and the 'EC model', respectively. The models allowed the maximum H 2 S IL (between 66.72 and 119.75 gS·m −3 ·h −1 ) to be determined for biogas use in a combustion engine (inlet H 2 S concentration between 72 and 359 ppm V ). The 'C model' was more sensitive to TLV (-0.1579 (gS·m −3 )/(m·h −1 )) in the same way the 'EC model' was also more sensitive to TLV (4.3303 (gS·m −3 )/(m·h −1 )). The results were successfully fitted to Ottengraf's model with a first-order kinetic limitation (R-squared above 0.92).

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Progressive change from nitrate to nitrite as the electron acceptor for the oxidation of H2S under feedback control in an anoxic biotrickling filter

Cited by 27 publications

References 33 publications

Microbial Ecology of Biofiltration Units Used for the Desulfurization of Biogas

Microbial Ecology of Biofiltration Units Used for the Desulfurization of Biogas

Markers for the Comparison of the Performances of Anoxic Biotrickling Filters in Biogas Desulphurisation: A Critical Review

Application of Response Surface Methodology for H2S Removal from Biogas by a Pilot Anoxic Biotrickling Filter

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