Biogas desulfurization and calorific value enhancement in compact H2S/CO2 absorption units coupled to a photobioreactor

Rocher-Rivas, Ricardo; González-Sánchez, Armando; Ulloa-Mercado, Gabriela; Muñoz, Raúl; Quijano, Guillermo

doi:10.1016/j.jece.2022.108336

Cited by 13 publications

(5 citation statements)

References 42 publications

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“…In the other hand, in biodigestion process of RC, the presence of these metals would not imply a higher particle material emission, due its the low temperature of processing. Nevertheless, it is recommended to clean the biogas to eliminate NOx, CO 2 , and H 2 S mainly [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Characterization of bovine ruminal content focusing on energetic potential use and valorization opportunities

Henao¹,

Chica²,

Granda³

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Characterization of bovine ruminal content focusing on energetic potential use and valorization opportunities

Henao¹,

Chica²,

Granda³

et al. 2023

Heliyon

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“…[201,203]. The outflow of purified methane gas occurs from the top of the column, and the liquid is recirculated from the photobioreactor [205][206][207][208][209][210]. The oxygen presence can facilitate the oxidation of H 2 S to SO 4 2− , and these compounds can be a source of sulfur for the cells but can also inhibit growth when in concentrations above 200 ppm [201,211].…”

Section: Biogas Upgradingmentioning

confidence: 99%

“…One strategy applied to reduce the oxygen content of the biogas is recirculation during the dark phase of cultivation, where the photosynthetic step is interrupted and the increased respiration of the microalgae occurs [219]. In addition to environmental parameters, reducing the hydraulic retention time of biogas in reactors can provide engineering benefits and operational strategies with airlift configuration absorption unit with an evaluation of bubble dispersion and system behavior enabled short hydraulic retention time (10 min) that resulted in approximately 14% improvement in biogas calorific value with complete H 2 S removal [206].…”

Section: Biogas Upgradingmentioning

confidence: 99%

Agro-Industrial Wastewaters for Algal Biomass Production, Bio-Based Products, and Biofuels in a Circular Bioeconomy

et al. 2022

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Recycling bioresources is the only way to sustainably meet a growing world population’s food and energy needs. One of the ways to do so is by using agro-industry wastewater to cultivate microalgae. While the industrial production of microalgae requires large volumes of water, existing agro-industry processes generate large volumes of wastewater with eutrophicating nutrients and organic carbon that must be removed before recycling the water back into the environment. Coupling these two processes can benefit the flourishing microalgal industry, which requires water, and the agro-industry, which could gain extra revenue by converting a waste stream into a bioproduct. Microalgal biomass can be used to produce energy, nutritional biomass, and specialty products. However, there are challenges to establishing stable and circular processes, from microalgae selection and adaptation to pretreating and reclaiming energy from residues. This review discusses the potential of agro-industry residues for microalgal production, with a particular interest in the composition and the use of important primary (raw) and secondary (digestate) effluents generated in large volumes: sugarcane vinasse, palm oil mill effluent, cassava processing waster, abattoir wastewater, dairy processing wastewater, and aquaculture wastewater. It also overviews recent examples of microalgae production in residues and aspects of process integration and possible products, avoiding xenobiotics and heavy metal recycling. As virtually all agro-industries have boilers emitting CO2 that microalgae can use, and many industries could benefit from anaerobic digestion to reclaim energy from the effluents before microalgal cultivation, the use of gaseous effluents is also discussed in the text.

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“…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%

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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Biogas desulfurization and calorific value enhancement in compact H2S/CO2 absorption units coupled to a photobioreactor

Cited by 13 publications

References 42 publications

Characterization of bovine ruminal content focusing on energetic potential use and valorization opportunities

Characterization of bovine ruminal content focusing on energetic potential use and valorization opportunities

Agro-Industrial Wastewaters for Algal Biomass Production, Bio-Based Products, and Biofuels in a Circular Bioeconomy

Hybrid Filtration Process for Gas Desulfurization

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