Effect of char addition on anaerobic digestion of animal by-products: evaluating biogas production and process performance

Arenas, Cristián B.; Meredith, William; Snape, Collin; Gómez, Xiomar; González, José Francisco; Martínez, Elia Judith

doi:10.1007/s11356-020-08828-8

Cited by 23 publications

(11 citation statements)

References 48 publications

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“…Other management options based on this principle have proven useful in achieving the full degradation of complex organic compounds, as it is the addition of biochar or the presence of bioanodes that favor different degradation pathways [106][107][108]. Cui et al [109] demonstrated the successful performance of the HSAD reactor when adding biochar, indicating that the improvement was mainly due to the presence of biochar in the media.…”

Section: Increasing Reactor Productivity By the Increase In Solid Content And Temperaturementioning

confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

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Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

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Section: Increasing Reactor Productivity By the Increase In Solid Content And Temperaturementioning

confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

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“…The solid product derived from HTC, also known as hydrochar, has been demonstrated to attain benefits when added as a supplement in anaerobic digestion and composting, similar to those reported by biochar obtained from pyrolysis processes [37][38][39][40][41][42]. Other reports have also demonstrated that char may act as an active compound, improving nutrient management in crops [43,44].…”

Section: Introductionmentioning

confidence: 55%

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

et al. 2021

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Anaerobic digestion is a biological process with wide application for the treatment of high organic-containing streams. The production of biogas and the lack of oxygen requirements are the main energetic advantages of this process. However, the digested stream may not readily find a final disposal outlet under certain circumstances. The present manuscript analyzed the feasibility of valorizing digestate by the hydrothermal carbonization (HTC) process. A hypothetical plant treating cattle manure and cheese whey as co-substrate (25% v/w, wet weight) was studied. The global performance was evaluated using available data reported in the literature. The best configuration was digestion as a first stage with the subsequent treatment of digestate in an HTC unit. The treatment of manure as sole substrate reported a value of 752 m3/d of biogas which could be increased to 1076 m3/d (43% increase) when coupling an HTC unit for digestate post-treatment and the introduction of the co-substrate. However, the high energy demand of the combined configurations indicated, as the best alternative, the valorization of just a fraction (15%) of digestate to provide the benefits of enhancing biogas production. This configuration presented a much better energy performance than the thermal hydrolysis pre-treatment of manure. The increase in biogas production does not compensate for the high energy demand of the pre-treatment unit. However, several technical factors still need further research to make this alternative a reality, as it is the handling and pumping of high solid slurries that significantly affects the energy demand of the thermal treatment units and the possible toxicity of hydrochar when used in a biological process.

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“…This number, according to Arena et al. (2020) is over 20 million tons in the European Union. Mora et al.…”

Section: Hidden Power Of the Fifth Quartermentioning

confidence: 93%

“…Biogas production is another energy source that can be derived from the fifth quarter through anaerobic digestion, which is a very versatile technology that produces biogas (mainly methane, 50–70%; carbon dioxide, 30–40%) to be used for heating and electricity generation (Arenas et al., 2020; Parralejo et al., 2019). Due to their high content of protein and lipids, the fifth quarter is energy‐rich feedstock ideal as the substrate for anaerobic digestion (Edström et al., 2003).…”

Section: Current Utilization Of the Fifth Quartermentioning

confidence: 99%

Exploring the prospects of the fifth quarter in the 21st century

Soladoye

Juárez

Estévez

et al. 2022

Comp Rev Food Sci Food Safe

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A variable proportion of slaughtered livestock, generally referred to as the fifth quarter, is not part of the edible dressed meat and regarded as animal byproduct. In order for the fifth quarter to play a significant role in the current effort toward a circular bio‐based economy, it has to successfully support food security, social inclusivity, environmental sustainability, and a viable economy. The high volume of these low‐value streams and their nutrient‐dense nature can facilitate their position as a very important candidate to explore within the context of a circular bio‐based economy to achieve some of the United Nations Sustainable Development Goals (UN‐SDGs). While these sources have been traditionally used for various applications across different cultures and industries, it seems evident that their full potential has not yet been exploited, leaving these products more like an environmental burden rather than valuable resources. With innovation and well‐targeted interdisciplinary collaborations, the potential of the fifth quarter can be fully realized. The present review intends to explore these low‐value streams, their current utilization, and their potential to tackle the global challenges of increasing protein demands while preventing environmental degradation. Factors that limit widespread applications of the fifth quarter across industries and cultures will also be discussed.

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Effect of char addition on anaerobic digestion of animal by-products: evaluating biogas production and process performance

Cited by 23 publications

References 48 publications

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

Exploring the prospects of the fifth quarter in the 21st century

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