New adsorbents from maize cob wastes and anaerobic digestate for H2S removal from biogas

Surra, Elena; Nogueira, Miguel Costa; Bernardo, María; Lapa, Nuno; Esteves, Isabel A. A. C.; Fonseca, Isabel

doi:10.1016/j.wasman.2019.05.048

Cited by 51 publications

(16 citation statements)

References 53 publications

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“…A previous study [60] reported a cost of $0.015/m 3 biogas for biological treatment using an industrial-scale biotrickling filter, and $0.027/m 3 biogas with FeCl 3 chemical oxidation treatment, which are both lower than our study ($0.09/m 3 biogas for microaeration and $0.41/m 3 biogas for iron filter) using small-scale systems [61,62]. Active carbon use had higher costs ($0.13/m 3 biogas) for removing H 2 S [10].…”

Section: Economic Analysis Of Low-cost H 2 S Removal Technologiescontrasting

confidence: 73%

Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters

et al. 2020

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Biological desulfurization of biogas from a field-scale anaerobic digester in Peru was tested using air injection (microaeration) in separate duplicate vessels and chemical desulfurization using duplicate iron filters to compare hydrogen sulfide (H2S) reduction, feasibility, and cost. Microaeration was tested after biogas retention times of 2 and 4 h after a single injection of ambient air at 2 L/min. The microaeration vessels contained digester sludge to seed sulfur-oxidizing bacteria and facilitate H2S removal. The average H2S removal efficiency using iron filters was 32.91%, with a maximum of 70.21%. The average H2S removal efficiency by iron filters was significantly lower than microaeration after 2 and 4 h retention times (91.5% and 99.8%, respectively). The longer retention time (4 h) resulted in a higher average removal efficiency (99.8%) compared to 2 h (91.5%). The sulfur concentration in the microaeration treatment vessel was 493% higher after 50 days of treatments, indicating that the bacterial community present in the liquid phase of the vessels effectively sequestered the sulfur compounds from the biogas. The H2S removal cost for microaeration (2 h: $29/m3 H2S removed; and 4 h: $27/m3 H2S removed) was an order of magnitude lower than for the iron filter ($382/m3 H2S removed). In the small-scale anaerobic digestion system in Peru, microaeration was more efficient and cost effective for desulfurizing the biogas than the use of iron filters.

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Section: Economic Analysis Of Low-cost H 2 S Removal Technologiescontrasting

confidence: 73%

Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters

et al. 2020

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“…Specific surface area and pore volume are the critical properties for these materials. Recent developments were achieved concerning adsorbents for CO 2 removal (Zhou et al, 2017), complemented with molecular simulations (Peng and Cao, 2013) to predict/produce the best materials (Esteves et al, 2008;Surra et al, 2019b;Bernardo et al, 2020;Liu et al, 2020b). Moreover, fresh overviews devoted to the state of the art of adsorbents for CO 2 removal have been focused on biomass derived porous carbons (Singh et al, 2019;Xu and Strømme, 2019;Sher et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Biomass Valorization to Produce Porous Carbons: Applications in CO2 Capture and Biogas Upgrading to Biomethane—A Mini-Review

et al. 2021

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Porous carbon materials, derived from biomass wastes and/or as by-products, are considered versatile, economical and environmentally sustainable. Recently, their high adsorption capacity has led to an increased interest in several environmental applications related to separation/purification both in liquid- and gas-phases. Specifically, their use in carbon dioxide (CO2) capture/sequestration has been a hot topic in the framework of gas adsorption applications. Cost effective biomass porous carbons with enhanced textural properties and high CO2 uptakes present themselves as attractive alternative adsorbents with potential to be used in CO2 capture/separation, apart from zeolites, commercial activated carbons and metal-organic frameworks (MOFs). The renewable and sustainable character of the precursor of these bioadsorbents must be highlighted in the context of a circular-economy and emergent renewable energy market to reach the EU climate and energy goals. This mini-review summarizes the current understandings and discussions about the development of porous carbons derived from bio-wastes, focusing their application to capture CO2 and upgrade biogas to biomethane by adsorption-based processes. Biogas is composed by 55–65 v/v% of methane (CH4) mainly in 35–45 v/v% of CO2. The biogas upgraded to bio-CH4 (97%v/v) through an adsorption process yields after proper conditioning to high quality biomethane and replaces natural gas of fossil source. The circular-economy impact of bio-CH4 production is further enhanced by the use of biomass-derived porous carbons employed in the production process.

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“…Porosity and surface chemistry, coupled to operating conditions (relative humidity, H 2 S concentration, O 2 concentration, presence of other contaminants in biogas stream, and temperature) are the main characteristics that involve the gas cleaning mechanisms [14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

H2S Removal with Sorbent Obtained from Sewage Sludges

et al. 2020

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Biochar obtained from sewage sludges are adopted for biogas cleaning. Sewage sludges are treated considering temperature, dwell time, activating agent, heating, and flow rate. The best performances achieved are registered considering the char produced at 400 °C using CO2 as an activating agent with a dwell time of 2 h. The adsorption capacity for the biogas cleaning CH4/CO2/H2S (20 ppm(v)) increased from 1.3 mg/g to 5.9 mg/g with the bed height. Future research with chemical activation processes will be made to improve the adsorption capacity achieved to produce cheaper sorbents than commercial ones.

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New adsorbents from maize cob wastes and anaerobic digestate for H2S removal from biogas

Cited by 51 publications

References 53 publications

Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters

Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters

Biomass Valorization to Produce Porous Carbons: Applications in CO2 Capture and Biogas Upgrading to Biomethane—A Mini-Review

H2S Removal with Sorbent Obtained from Sewage Sludges

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