Effects of char from biomass gasification on carbon retention and nitrogen conversion in landfill simulation bioreactors

Peng, Wei; Pivato, Alberto; Garbo, Francesco; Wang, Tianfeng

doi:10.1007/s11356-019-07391-1

Cited by 8 publications

(2 citation statements)

References 42 publications

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“…phosphorus, potassium, nitrogen, and other micronutrients) from agricultural waste, such as energy crops, livestock manure, agricultural residues and straw, and others, is widely accepted as a soil biofertiliser to promote crop growth and land health. However, the massive quantities of digestate produced by anaerobic digestion facilities and proper management have raised concerns about valorising this byproduct, whereas without proper management policies, the digestate of anaerobic digestion contributes not only to nutrient pollution, such as eutrophication, harmful algal blooms, and hypoxia (Lamolinara et al 2022) but may also result in a variety of environmental risks, such as pathogen spread and heavy metal pollution (Logan and Visvanathan 2019;Peng and Pivato 2019) and substantial greenhouse gas emissions (Peng et al 2020a(Peng et al , 2020b. As a result, managing the anaerobic digestion effluent digestate in a way that ensures an environmental and circular economy is currently a bottleneck for the sustainability of biogas plants (Peng et al 2020b).…”

Section: Solid Digestate As a Carbon Sequestration Toolmentioning

confidence: 99%

Integration of biogas systems into a carbon zero and hydrogen economy: a review

et al. 2022

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The Ukraine conflict has put critical pressure on gas supplies and increased the price of fertilisers. As a consequence, biogas has gained remarkable attention as a local source of both gas for energy and biofertiliser for agriculture. Moreover, climate change-related damage incentivises all sectors to decarbonise and integrate sustainable practices. For instance, anaerobic digestion allows decarbonisation and optimal waste management. Incorporating a biogas system in each country would limit global warming to 2 °C. If suitable policies mechanisms are implemented, the biogas industry could reduce global greenhouse gas emissions by 3.29–4.36 gigatonnes carbon dioxide equivalent, which represent about 10–13% of global emissions. Here, we review the role of the biogas sector in capturing methane and mitigating carbon emissions associated with biogas outputs. Since biogas impurities can cause severe practical difficulties in biogas storing and gas grid delivering systems, we present upgrading technologies that remove or consume the carbon dioxide in raw biogas, to achieve a minimum of 95% methane content. We discuss the role of hydrogen-assisted biological biogas upgrading in carbon sequestration by converting carbon dioxide to biomethane via utilising hydrogen generated primarily through other renewable energy sources such as water electrolysis and photovoltaic solar facilities or wind turbines. This conceptual shift of 'power to gas' allows storing and utilising the excess of energy generated in grids. By converting carbon dioxide produced during anaerobic digestion into additional biomethane, biogas has the potential to meet 53% of the demand for fossil natural gas. We also evaluate the role of digestate from biogas systems in producing biochar, which can be used directly as a biofertiliser or indirectly as a biomethanation enhancement, upgrading, and cleaning material.

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Section: Solid Digestate As a Carbon Sequestration Toolmentioning

confidence: 99%

Integration of biogas systems into a carbon zero and hydrogen economy: a review

et al. 2022

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“…In contrast, biochar can be produced without activation, making it an environmentally friendly alternative to activated carbon. Biochar has several fundamental properties, including low water solubility, high carboxylation, aromatic structure, porosity, electrical conductivity, and specific surface area, resulting in high adsorption capacity, oxidation resistance, and decomposition resistance [7][8][9][10][11]. In addition, biochar contributes to long-term carbon sequestration in soil, making it a unique natural carbon sequestration method [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effects of UV Light Treatment on Functional Group and Its Adsorption Capacity of Biochar

Qin

Shin

2023

Energies

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This study aimed to investigate the impact of UV treatment on the surface functionality and adsorption capacity of biochar, with the goal of enhancing its effectiveness as an adsorbent for toluene. The surface and near-surface functionality and structure of biochar were studied to evaluate the impact of UV treatment by utilizing X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) techniques. Biochar was generated by pyrolyzing wood chips at 900 °C without any oxidant injection in order to increase their carbon content. To boost biochar’s adsorption capability, UV irradiation on the biochar is utilized before and during the penetration process. Toluene was selected as the target absorbing material. The equilibrium adsorption capacity and rate were simulated using the Wheeler equation. It was found that the adsorption capacity of biochar increased significantly after pretreatment with ultraviolet light irradiation with a wavelength of 254 nm and an intensity of 280 μW/cm2 and reached a saturated state after 15 h. SEM and XPS showed that the UV-biochar modification technology not only improved the pore structure of biochar, but also increased the content of -O-containing functional groups on the surface of biochar and improved the adsorption capacity of biochar. The experimental results for sample M50_Uu demonstrated significant improvement in adsorption performance. The adsorption saturation time increased by 80%, and the equilibrium adsorption capacity rose from 12.80 mg/g to 54.60 mg/g. The main reason for the adsorption capacity increase by UV treatment is functional group formation, of which rate linearly increases with pretreatment energy until 11 W·hr/gbiochar, after which the increase rate is slow.

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