Potential of wood ash in purification of biogas

Mulu, Elshaday; M’Arimi, Milton M.; Ramkat, Rose C.; Mecha, Achisa C.

doi:10.1016/j.esd.2021.09.009

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…The successful use of clay and biochar is beneficial to small-scale digesters, who find the conventional technologies to be expensive because of low economies of scale [7]. A novel process involving the use of the dry adsorption of wood ash and carbonation technologies in the upgrading of biogas was created [37]. In this study, 88% CH 4 purity and 2.30 mmolg −1wood ash CO 2 uptake were achieved.…”

Section: Common Methods Of Biogas Upgrading To Biomethanementioning

confidence: 92%

Biogas Valorisation to Biomethane for Commercialisation in South Africa: A Review

Shonhiwa,

Mapantsela,

Makaka

et al. 2023

Energies

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Biogas consists of mainly methane, as a source of energy, and impurities such as carbon dioxide, hydrogen sulphide, water, and siloxanes. These impurities, such as hydrogen sulphide, reduce the biogas energy content and corrode equipment that store, transport, or utilise biogas. Several reviews on upgrading biogas to biomethane have been published, but minimal focus has been put on upgrading biogas for commercialisation in South Africa. Thus, this study reviewed biogas upgrading techniques in South Africa to put together information on activities and experiences on biogas valorisation to enhance the chances for different stakeholders to learn and build on from local experiences. To capture all relevant information, literature from the past 10 years was retrieved from online databases and government, municipality, and companies’ websites and institutional repositories. The review covered the sorption, separation, and in situ techniques that are globally used for upgrading biogas. The status of the biogas sector and the upgrading activities that occur in the country with their cost, energy, and environmental impacts were given in detail. It is estimated that a total of 3 million Nm3d−1 of biogas can be produced in the country from biogas substrates. Thus, researchers and entrepreneurs are encouraged to collaborate to utilise the abundant resources used for biogas production to enhance the commercialisation of biomethane.

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Section: Common Methods Of Biogas Upgrading To Biomethanementioning

confidence: 92%

Biogas Valorisation to Biomethane for Commercialisation in South Africa: A Review

Shonhiwa,

Mapantsela,

Makaka

et al. 2023

Energies

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“…Both experiments used wood ash with a moisture content of 20%. The dry absorption process required a higher mass of activated wood ash, which was increased from 2.5 to 35 g and led to an increase in the removal of CO 2 from 8.9 to 67.9% [51]. The specific requirement of wood ash per unit of volume of processed gas was about 7 kg/Nm 3 .…”

Section: Ashesmentioning

confidence: 99%

Removal of CO2 from Biogas during Mineral Carbonation with Waste Materials

Rusanowska

Zieliński

Dębowski

2023

IJERPH

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Biogas represents a source of renewable energy that could provide a replacement for fossil fuels to meet the increasing demand for energy. The upgrading of biogas through the removal of CO2 to a content of 95–97% of CH4 is necessary to increase its calorific value. This review focuses on biogas upgrading technologies using wastes or residues that enable the performing of mineral carbonation. In this research, we analyzed a natural biogas or synthetic one with a content of about (40–50%) of carbon dioxide. The chemical absorption is also briefly described in this study, due to its being the first step in innovative absorption and regeneration processes using mineral carbonization. Wastes with high calcium contents, i.e., ashes, steel-making slags, and stabilized wastewater anaerobic sludge, were considered for direct carbonization, taking into account the leaching of particles from carbonated wastes/residues. Moreover, the different types of reactors used for mineral carbonation have been described. The presented technological solutions are easy to use and economical, and some of them also take into account the regeneration of reagents. However, in the context of their direct use in biogas plants, it is necessary to consider the availability of wastes and residues.

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“…Moreover, Mulu et al have demonstrated in recently published articles [57][58][59][60] that biogas purification and upgrading can also be achieved by the applications of several natural materials, such as zeolite, clay, fly ash and wood ash. Moreover, in recent years, many attempts have been made by researchers to investigate CO 2 conversion using alternative technologies.…”

Section: Introductionmentioning

confidence: 99%

Biogas Upgrading Using a Single-Membrane System: A Review

Tomczak,

Gryta,

Daniluk

et al. 2024

Membranes

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In recent years, the use of biogas as a natural gas substitute has gained great attention. Typically, in addition to methane (CH4), biogas contains carbon dioxide (CO2), as well as small amounts of impurities, e.g., hydrogen sulfide (H2S), nitrogen (N2), oxygen (O2) and volatile organic compounds (VOCs). One of the latest trends in biogas purification is the application of membrane processes. However, literature reports are ambiguous regarding the specific requirement for biogas pretreatment prior to its upgrading using membranes. Therefore, the main aim of the present study was to comprehensively examine and discuss the most recent achievements in the use of single-membrane separation units for biogas upgrading. Performing a literature review allowed to indicate that, in recent years, considerable progress has been made on the use of polymeric membranes for this purpose. For instance, it has been documented that the application of thin-film composite (TFC) membranes with a swollen polyamide (PA) layer ensures the successful upgrading of raw biogas and eliminates the need for its pretreatment. The importance of the performed literature review is the inference drawn that biogas enrichment performed in a single step allows to obtain upgraded biogas that could be employed for household uses. Nevertheless, this solution may not be sufficient for obtaining high-purity gas at high recovery efficiency. Hence, in order to obtain biogas that could be used for applications designed for natural gas, a membrane cascade may be required. Moreover, it has been documented that a significant number of experimental studies have been focused on the upgrading of synthetic biogas; meanwhile, the data on the raw biogas are very limited. In addition, it has been noted that, although ceramic membranes demonstrate several advantages, experimental studies on their applications in single-membrane systems have been neglected. Summarizing the literature data, it can be concluded that, in order to thoroughly evaluate the presented issue, the long-term experimental studies on the upgrading of raw biogas with the use of polymeric and ceramic membranes in pilot-scale systems are required. The presented literature review has practical implications as it would be beneficial in supporting the development of membrane processes used for biogas upgrading.

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Potential of wood ash in purification of biogas

Cited by 13 publications

References 40 publications

Biogas Valorisation to Biomethane for Commercialisation in South Africa: A Review

Biogas Valorisation to Biomethane for Commercialisation in South Africa: A Review

Removal of CO2 from Biogas during Mineral Carbonation with Waste Materials

Biogas Upgrading Using a Single-Membrane System: A Review

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