Related references
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Article
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Summary: Anaerobic digestion of agricultural waste can produce biogas as renewable energy source, along with a large amount of solid digestate. This study explores the fabrication of activated carbon from solid digestate using phosphoric acid activation. The influence of H3PO4/digestate char impregnation ratio on the properties of activated carbon was evaluated, and its potential for CO2 capture was examined. The results showed that an appropriate ratio of H3PO4/digestate char can promote the formation of pore structure and achieve high surface area.
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Summary: Coffee production generates a large amount of waste, particularly industrial spent coffee ground (ISCG). The anaerobic digestion (AD) of ISCG has the potential to reduce landfill residues and greenhouse gas emissions while increasing renewable energy sources. However, there is limited data on AD key parameters for ISCG as a substrate. This study assessed the influence of inoculum-to-substrate ratio (ISR) and solid content on ISCG-AD and found that certain threshold values should be maintained to ensure experimental reliability and maximize methane yield potential.
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C. E. Hollas et al.
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SCIENCE OF THE TOTAL ENVIRONMENT
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Fabio Rizzioli et al.
Summary: The unsustainable environmental impact of fossil derived fertilizers and the depletion of raw materials for their production make the research of alternative sources for fertilizers production one of the main priorities of the international agenda. Different technologies for nutrient recovery from agricultural digestate, such as ammonia stripping and struvite precipitation, pressure-driven membrane technologies, ion exchange, adsorption, evaporation, and electrodialysis, are discussed in this paper. Their robustness, yields, and costs are evaluated to determine their potential for large-scale applications.
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Eva Maria Prem et al.
Summary: Anaerobic digestion (AD) of organic waste materials is an ecological way to produce biogas. However, high concentrations of aromatic compounds like phenyl acids (PA) in organic waste can inhibit the AD process. This study investigated the effects of increasing PA concentrations on AD using six biogas reactors, and found that an increase in acetate and propionate concentrations were the earliest signs of process impairments. Furthermore, the study showed that syntrophic VFA oxidation and hydrogenotrophic methanogenesis became relevant in impaired but still biogas producing reactors, and the decrease in biogas production is a time-delayed sign of process impairments.
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Dominic Yellezuome et al.
Summary: The high impurity concentration of biogas limits its commercial utilization. This review focuses on the integration of two-stage anaerobic digestion process with in situ biogas upgrading technologies, discussing their principles, influencing factors, research progress, and technical challenges. pH, alkalinity, and hydrogenotrophic methanogenesis are identified as crucial factors influencing these technologies. pH fluctuation and low gas-liquid mass transfer of H-2 are major technical challenges that hinder the full-scale application of in situ upgrading techniques. The review proposes integrating two-stage anaerobic digestion with various in situ upgrading techniques to overcome these constraints and advance the development and commercialization of these techniques.
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Jumana Al-Mallahi et al.
Summary: Anaerobic digestate is a challenging medium for cultivating microalgae due to its dark color and high ammonium-nitrogen concentration. Various pretreatment methods like filtration, centrifugation, ammonia stripping, and biological pretreatment have been found effective in overcoming these obstacles and facilitating microalgae cultivation. Combining different pretreatment methods and using selected microalgae strains without dilution are potential strategies for optimizing microalgae cultivation in anaerobic digestate.
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Angela Bywater et al.
Summary: The UK has a unique opportunity to create an exemplar in small-scale farm anaerobic digesters for renewable electricity and heat. The economic viability of farm-based biogas production was analyzed, taking into account various factors such as support levels, energy prices, capital cost, internal rate of return (IRR), and digestate value. The study showed that the technology approaches subsidy-free viability, but wider environmental and societal benefits must be explicitly valued for widespread adoption.
Article
Environmental Sciences
Anurita Selvarajoo et al.
Summary: This study investigates the conversion of citrus peels biomass into biochar through slow pyrolysis and examines the effect of pyrolysis temperature on the quality of the resulting biochar. The potential usage of the derived biochar as a solid fuel is also discussed.
Article
Green & Sustainable Science & Technology
Huaping Xiao et al.
Summary: This study evaluated the environmental and economic impacts of different scenarios for food waste and biogas digestate management in Shenzhen, China. The results showed that dry AD coupled with biogas digestate incineration had the best net environmental benefits, reducing 195 kg CO2 per ton of FW, and was the most economically feasible option. Dry AD scenarios exhibited better environmental benefits compared to wet AD, especially in terms of global warming, human toxicity, marine aquatic ecotoxicity, and photochemical ozone creation potential. Incineration was found to be the best post treatment option for biogas digestate.
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Summary: This study evaluates the environmental performance of three digestate utilization scenarios for bio-fertilizer production. The results show that digestate post-treatment is a sustainable solution that can decrease the loss of nitrogen and phosphorus, support circular nutrient management, and increase the substitution of mineral fertilizers.
SCIENCE OF THE TOTAL ENVIRONMENT
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Barbara Lamolinara et al.
Summary: Digestate is a nutrient-rich by-product from organic waste anaerobic digestion, but it can contribute to nutrient pollution without comprehensive management strategies. This study explores various aspects of digestate production, including feedstocks, processing technologies, economics, product quality, impurities, incentives, and regulations. The results indicate that feedstock, processing technology, and process operating conditions significantly influence the characteristics of digestate products. Incentive policies and regulations play a crucial role in promoting economic benefits. However, there is a lack of quality assurance certification systems for commercializing digestate products. Further development of technologies, processes, incentives, quality regulation, and social awareness is necessary for the sustainable and safe use of digestate in different applications. Future research should focus on circular business models and standardized international regulations for digestate products.
Review
Chemistry, Multidisciplinary
Ahmed Tawfik et al.
Summary: Solid wastes from various sectors pose economic and environmental challenges, but cultivating mixotrophic algae on anaerobic digestate offers a promising solution for nutrient recovery, pollutant removal, and biofuel production.
ENVIRONMENTAL CHEMISTRY LETTERS
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Ashley Cathcart et al.
Summary: Production of digestate pellets can provide renewable energy and additional income to farms, while reducing the risk to soil and water quality. However, little is known about the bio-safety aspects of the system and the potential impacts on human health.
GLOBAL CHANGE BIOLOGY BIOENERGY
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Wenfeng Yang et al.
Summary: This paper reviews the integrated system of purifying anaerobic digestion slurry and upgrading biogas through microalgal cultivation technology. The mechanisms, configurations, and influencing factors of the system are elaborated, and feasibility suggestions are provided.
BIORESOURCE TECHNOLOGY
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Zhijie Wang et al.
Summary: With the wider application of anaerobic digestion in food waste treatment, the management of digestate has become a bottleneck in terms of economics and carbon mitigation. This study assessed the performance of desalination using electrodialysis on mature and fresh liquid digestate, and also investigated the migration patterns of nutrients and value-added products. The results showed that electrodialysis could effectively remove salts and recover nitrogen, phosphorus, and volatile fatty acids from the digestate. However, membrane fouling brought uncertainty to the operating costs.
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James O'Connor et al.
Summary: The valorisation of food waste into digestate through anaerobic digestion is important for achieving a circular bioeconomy. Food waste digestate can provide essential nutrients to soils, increase yield, and potentially replace synthetic fertilisers. Integrating anaerobic digestion with emerging uses can reduce inhibitory sources of digestate and provide economic opportunities for businesses.
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Wojciech Czekala et al.
Summary: This article discusses the production and use of digestate as a fertilizer, including methods such as composting, biochar, and fertilizer granules. Numerous scientific studies indicate that digestate can be used directly as a fertilizer and can also be processed into products suitable for specific soil and plant needs. However, further research is needed, particularly on the impact of raw material diversity and processing methods on the composition and performance of digestate.
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Mateusz Samoraj et al.
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Review
Agricultural Engineering
Shanta Dutta et al.
Summary: Anaerobic digestion is widely used to produce biogas from food waste, but a significant amount of nutrient-rich food waste anaerobic digestate (FWD) remains under-utilised. FWD has potential as a nutrient source for microalgal cultivation and biofuel production, and emerging technologies like thermal conversion show promise in converting FWD into value-added products like biochar/hydrochar. Integrated AD with valorisation facilities is encouraged to achieve complete resource utilisation and reduce carbon emissions.
BIORESOURCE TECHNOLOGY
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Joyner Caicedo-Zuniga et al.
Summary: The study aimed to develop a model for predicting and characterizing the compaction behavior of sugarcane agricultural residues under different moisture contents and particle sizes. The model was calibrated using confined-compaction and stress relaxation experiments, providing accurate predictions of the energy required for bale production and the final relaxed density of the material.
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Bingjie Li et al.
Summary: This work fabricated two types of dual-heteroatom doped bio-based carbon, with N, P co-doped bio-based carbon showing the best methane production and digestion performance in anaerobic co-digestion system. Additionally, the digestates exhibited good thermal stability and potential as organic fertilizer.
CHEMICAL ENGINEERING JOURNAL
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Yasir Abbas et al.
Summary: Research shows that utilizing low-cost carbon-based materials such as biochar and activated carbon in anaerobic digestion process can enhance methane yield and digestate quality, while reducing operational instability and promoting microbial breakdown activity, achieving the goal of optimizing AD technology.
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Wei Wang et al.
Summary: Anaerobic digestion is seen as a promising technology for bioenergy production, generating digestate as residual waste. The digestate contains both organic and inorganic matters, which can be considered as risky contaminants if not properly treated, but can also be valuable resources if recovered adequately. This review examines current research efforts on digestate valorization, focusing on resource recovery and potential applications, including conversion techniques and economic feasibility. The prospects for digestate valorization are optimistic.
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