Review: recent advances in biogas purifying technologies

Baena‐Moreno, Francisco M.; Rodríguez‐Galán, Mónica; Vega, Fernando; Vilches, Luís F.; Navarrete, Benito

doi:10.1080/15435075.2019.1572610

Cited by 101 publications

(46 citation statements)

References 79 publications

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“…The raw biogas obtained from an anaerobic digester mainly consist of CH 4 with 40-45% CO 2 including a minor content of impurities, such as water, siloxanes, ammonia and hydrogen sulfide [1,2]. Great efforts have been made in the biogas separation and purification technologies to procure biomethane with a low energy footprint [3,4]. The removal of CO 2 from biogas increases the methane content to above 98 vol%, which offers the use of upgraded biogas in natural gas grids and as a fuel for automotive industry [5].…”

Section: Introductionmentioning

confidence: 99%

Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

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Biogas is a potential renewable energy resource that can reduce the current energy dependency on fossil fuels. The major limitation of utilizing biogas fully in the various applications is the presence of a significant volume fraction of carbon dioxide in biogas. Here, we used adsorption-driven CO2 separation using the most prominent adsorbents, NaX (faujasite) and CaA (Linde Type A) zeolites. The NaX and CaA zeolites were structured into hierarchically porous granules using a low-cost freeze granulation technique to achieve better mass transfer kinetics. The freeze granulation processing parameters and the rheological properties of suspensions were optimized to obtain homogenous granules of NaX and CaA zeolites 2–3 mm in diameter with macroporosity of 77.9% and 68.6%, respectively. The NaX and CaA granules kept their individual morphologies, crystallinities with a CO2 uptake of 5.8 mmol/g and 4 mmol/g, respectively. The CO2 separation performance and the kinetic behavior were estimated by breakthrough experiments, where the NaX zeolite showed a 16% higher CO2 uptake rate than CaA granules with a high mass transfer coefficient, 1.3 m/s, compared to commercial granules, suggesting that freeze-granulated zeolites could be used to improve adsorption kinetics and reduce cycle time for biogas upgrading in the adsorption swing technology.

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Section: Introductionmentioning

confidence: 99%

Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

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“…The hypolimnions of the reservoirs, in which dissolved oxygen levels can fall to zero near the water-sediment interface [9][10][11], can be major producers of methane. At times the methane production can be so high that it can become a source of energy [12,13] on being collected and purified [14]. Moreover, CH 4 has 34 and 86 times higher global warming potential (GWP) than CO 2 , on 100-year and 20-year time horizons, respectively [14].…”

Section: Introductionmentioning

confidence: 99%

“…At times the methane production can be so high that it can become a source of energy [12,13] on being collected and purified [14]. Moreover, CH 4 has 34 and 86 times higher global warming potential (GWP) than CO 2 , on 100-year and 20-year time horizons, respectively [14]. This can make its contribution to the overall greenhouse gas (GHG) emissions from reservoirs highly significant.…”

Section: Introductionmentioning

confidence: 99%

A Model to Forecast Methane Emissions from Topical and Subtropical Reservoirs on the Basis of Artificial Neural Networks

Tabassum-Abbasi

Abbasi

Luithui

et al. 2020

Water

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In view of the great paucity of information on the exact contributions of different causes which lead to different extents of emission of the greenhouse gas methane (CH4) form reservoirs, it is tremendously challenging to develop statistical or analytical models for forecasting such emissions. Artificial neural networks (ANNs) have the ability to discern linear or non-linear relationships despite very limited data inputs and can recognize even complex patterns in a data set without a priori understating of the underlying mechanism. Hence, we have used ANNs to develop a model linking CH4 emissions to five of the reservoir parameters about which data is most commonly available in the prior art. Using a compendium of all available data on these parameters, of which a small part was kept aside for use in model validation, it has been possible to develop a model which is able to forecast CH4 emissions with a root mean square error of 37. It indicates a precision significantly better than the ones achieved in previous reports. The model provides a means to estimate CH4 emissions from reservoirs of which age, mean depth, surface area, latitude and longitude are known.

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“…The need to combine renewable energies with current fossil fuels to reduce pollution is one of the topics most discussed by the scientific community . Biogas, mainly composed of carbon dioxide (CO 2 ) and methane (CH 4 ), is one of the most studied sources of renewable energy . Biogas comes from the anaerobic digestion of different types of biomass.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit

Baena‐Moreno

Price

Saché

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: This paper presents a physicochemical comparison of the solid products obtained from two alternative processes that recycle waste sodium carbonate (Na 2 CO 3 ) solution, which is produced following the absorption of CO 2 in a biogas upgrading unit. Chemical regeneration processes offer an attractive alternative to the energetically demanding standard physical methods. In the first process, sodium hydroxide (NaOH) is regenerated as a precipitate from the chemical reaction of Na 2 CO 3 with calcium hydroxide (Ca(OH) 2 ). The second process shows a path to obtain a valuable sodium chloride (NaCl) and calcium carbonate (CaCO 3 ) rich brine from calcium chloride (CaCl 2 ) acting as a precipitant agent. In both processes, precipitated calcium carbonate (PCC) is obtained as the most valuable by-product, but with varying properties owing to the different origin. RESULTS: The purpose of this work is to analyze physicochemically both variations of PCCs obtained and examine the differences between these solid samples in order to determine which method produces more desirable characteristics in the final product.To this end, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed as characterization methods. The results reflect that both PCCs have a calcite crystal structure, or morph, being as both PCC products originate from CaCl 2 that is more similar to commercial calcium carbonate calcite. CONCLUSION: These results confirmed that a pure CaCO 3 valuable by-product can be obtained from a biogas upgrading unit with several industrial applications.

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Review: recent advances in biogas purifying technologies

Cited by 101 publications

References 79 publications

Freeze Granulated Zeolites X and A for Biogas Upgrading

Freeze Granulated Zeolites X and A for Biogas Upgrading

A Model to Forecast Methane Emissions from Topical and Subtropical Reservoirs on the Basis of Artificial Neural Networks

Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit

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