Recent advances in biological technologies for anoxic biogas desulfurization

Almenglo, Fernando; González-Cortés, José Joaquín; Ramírez, Martín; Cantero, Domingo

doi:10.1016/j.chemosphere.2023.138084

Cited by 16 publications

(10 citation statements)

References 98 publications

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“…It has to be noted that the maximum value of the overall removal capacity, RC, of the desulfurization process was around 35 ± 2 gH 2 S m −3 h −1 (Figure 3), i.e., significantly lower than RC CCAF , since volumes of both the CCAF and the BTF must be considered for the calculation. Nonetheless, for an EBRT of 120 s, an RC around 35 ± 2 gH 2 S m −3 h −1 is in the range of the data from the literature reviewed by Almenglo et al [5], dedicated to the biological technologies for anoxic biogas desulfurization.…”

Section: Performance Of the Processmentioning

confidence: 56%

“…As H 2 S is a corrosive gas, it must be removed before biogas combustion to avoid sulfur dioxide formation (SO 2 ) and equipment damages (engines, boilers, etc.). The H 2 S concentrations in biogas typically range from 0.1 to 1%, but higher concentrations are possible [5]. Biogas purification is a multistage process including desulfurization (removal of H 2 S), dehydration (removal of H 2 O) and decarbonation (removal of CO 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…Since the first study regarding anoxic desulfurization in 2008 [15], a large number of studies using BTF were carried out, but other bioreactors were also investigated (stirred tank reactors, gas-lift, bubble columns, etc.) [5,[16][17][18]. Nitrate or nitrite can be purchased from a commercial supplier (chemical source), but this solution is expensive [19], and recent studies suggest using local and biogenic nitrogen sources instead.…”

Section: Introductionmentioning

confidence: 99%

“…Nitrate or nitrite can be purchased from a commercial supplier (chemical source), but this solution is expensive [19], and recent studies suggest using local and biogenic nitrogen sources instead. Nitrate or nitrite is thus produced in situ in a nitrification bioreactor through the biological oxidation of ammonium-rich effluent [5,20]. The pairing of a bioreactor treating ammonium with an anoxic BTF purifying biogas would therefore be beneficial for removing the pollutants H 2 S, NO 3 − and NO 2 − simultaneously [5,15].…”

Section: Introductionmentioning

confidence: 99%

“…Nitrate or nitrite is thus produced in situ in a nitrification bioreactor through the biological oxidation of ammonium-rich effluent [5,20]. The pairing of a bioreactor treating ammonium with an anoxic BTF purifying biogas would therefore be beneficial for removing the pollutants H 2 S, NO 3 − and NO 2 − simultaneously [5,15]. But there are still many key operational aspects to overcome before this attractive solution can be implemented on an industrial scale.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Filtration Process for Gas Desulfurization

Germain,

Poser,

Peu

et al. 2023

Processes

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A hybrid desulfurization process combining a physical filtration stage on cellular concrete (CC abiotic filter, called CCAF) and a biotrickling filter (called BTF) filled with expanded schist as packing material was used to remove high H2S concentrations from a synthetic gas containing dinitrogen (N2), dioxygen (O2) and H2S without the addition of a nutritive solution. Provided that small amounts of oxygen are present in the gas (1.2 ± 0.1% in volume), the global removal efficiency was 100%, and the global removal capacity reached 35 ± 2 gH2S m−3 h−1 for a total empty bed residence time (EBRT) of 120 s (CCAF + BTF). The resilience of the desulfurization process was demonstrated by applying severe changes in the H2S concentrations, from 160 to 1150 ± 20 mg m−3 for an EBRT = 120 s. According to the performances of the abiotic filter, which can decline over time due to the lifetime of the cellular concrete (137 days), the biotrickling filter reacted either as a refining system or as an efficient system able to treat significant H2S loading rates (up to 45 ± 3 gH2S m−3 h−1). Depending on the operating conditions, the increase in the pressure drops of the biotrickling filter (from 45 ± 3 to 234 ± 8 Pa m−1) highlighted biomass accumulation, especially extremophilic Acidithiobacillus sp. Considering the cellular concrete abiotic filter alone, removal capacities of up to 56 ± 3 gH2S m−3 h−1 were recorded for an EBRT of 60 s, demonstrating that gases such as landfill biogas or household biogas could be efficiently treated using this simple technique.

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Section: Performance Of the Processmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%