Search results for: anaerobic-digestion-of-biomass

Anaerobic Digestion of Biomass

Author : D.P. Chynoweth
File Size : 69.25 MB
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Bioenergy Production by Anaerobic Digestion

Author : Nicholas Korres
File Size : 72.37 MB
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Interest in anaerobic digestion (AD), the process of energy production through the production of biogas, has increased rapidly in recent years. Agricultural and other organic waste are important substrates that can be treated by AD. This book is one of the first to provide a broad introduction to anaerobic digestion and its potential to turn agricultural crops or crop residues, animal and other organic waste, into biomethane. The substrates used can include any non-woody materials, including grass and maize silage, seaweeds, municipal and industrial wastes. These are all systematically reviewed in terms of their suitability from a biological, technical and economic perspective. In the past the technical competence and high capital investment required for industrial-scale anaerobic digesters has limited their uptake, but the authors show that recent advances have made smaller-scale systems more viable through a greater understanding of optimising bacterial metabolism and productivity. Broader issues such as life cycle assessment and energy policies to promote AD are also discussed.

Methane Production by Anaerobic Digestion of Biomass

Author : Vincent G. Murphy
File Size : 51.5 MB
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Marine Biomass System

Author : Kendall F. Haven
File Size : 71.31 MB
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Anaerobic Digestion in Built Environments

Author : Anna Sikora
File Size : 66.83 MB
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Anaerobic digestion of biomass to biogas, commonly occurring in natural anoxic ecosystems, is an excellent method for utilizing wastes and producing green energy. This book presents examples of local installations of AD, or their proposals, located at small factories, workplaces, and in rural areas and housing complexes. The facilities consider the specific nature of the region, site conditions, and specificity of the utilized wastes. They protect the environment and ensure dispersed energy production. The latter is of great economic significance due to its closeness to end customers. Small local installations expand the pool of renewable energy on a global scale.

Studies on the Anaerobic Digestion of Biomass

Author : Murray Robert Leong
File Size : 77.95 MB
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Pretreatment to Enhance the Anaerobic Digestion of Recalcitrant Lignocellulosic Biomass Materials

Author : Muhammad Usman Khan
File Size : 52.12 MB
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Energy consumption using fossil fuels creates environmental pollution including greenhouse gasses promoting climate changes throughout the world. To levitate these problems, renewable energy sources have been promoted as an alternative. Lignocellulose is one of the most abundant and renewable biomass resources on the earth which makes it an ideal feedstock for production of biofuels particularly biogas. However, AD of the lignocellulosic materials is also limited due to the crystallinity of cellulose and embedded connections to lignin within the cellulose and hemicellulose polymer. The primary hypothesis of this study is to manipulate different types of pretreatments to decrease the recalcitrance, improve the hydrolysis and biogas production from lignocellulosic materials. Wet explosion Pretreatment, Alkaline thermal pretreatment, Mono and combined alkali pretreatment were tested for AD of lignocellulosic materials.The results revealed that increased severity of wet explosion pretreatment with base addition (2%) increased the biogas yield and lignin conversion (56%) during AD with demethoxylation up to 49%. The lignin samples having the highest NaOH concentration in addition to oxygen resulted in highest methane yield during anaerobic digestion.The alkaline thermal pretreatment was used for AD of residual manure fibers after AD. The results of study showed that degradation of manure fibers was improved ca. 43.6% as a result of alkaline thermal pretreatment with 3% w/w NaOH added. Methane yield improved by 143.5 and 180.2% under mesophilic and thermophilic conditions, respectively. Compositional analysis of effluent after AD showed that 57.3% of cellulose, 70.1% of hemicellulose, 39.4% of acid soluble and 19.4% of acid insoluble lignin was converted to methane under thermophilic conditions while under mesophilic conditions, 50.8% of the cellulose, 59.5% of the hemicellulose, 39.9% of acid soluble and 21.7% of acid insoluble lignin was converted to methane. The lime (CaO), NaOH and CaO+NaOH pretreatment was tested for AD of digested manure fibers. The methane yield improved by 115.7, 127.1 and 148.7% by CaO, NaOH and NaOH + CaO pretreatment respectively. The VS degradation was found to be 40.6, 42.6 and 46.4% by CaO, NaOH and NaOH + CaO pretreatment respectively.

Anaerobic Digestion

Author : Jacob Joseph Lamb
File Size : 24.29 MB
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With the growing demand for renewable, sustainable and efficient energy, biogas is one of the most promising methods to meet global renewable energy goals. Anaerobic Digestion: From Biomass to Biogas provides a comprehensive and systematic guide to developing and implement technology for biogas. This book gives a brief overview of biogas as an energy alternative, discusses biomass resources, basic biogas science and engineering, feedstock characterisation, storage, pretreatment and yield optimisation. Plant design, development and process control, emissions, digestate quality, engineering, process optimisation, land use and fertilisation are also included. Biogas generation, cleaning, upgrading and use as a transport fuel are also discussed. Anaerobic Digestion: From Biomass to Biogas is a practical guide to biogas technologies for process developers, producers, industrial chemists and biochemists, biologists, researchers, and academics in this area. https: //

Current Advances in Anaerobic Digestion Technology

Author : Marcell Nikolausz
File Size : 24.15 MB
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Anaerobic digestion (AD) is one of the oldest biotechnological processes and originally referred to biomass degradation under anoxic conditions in both natural and engineered systems. It has been used for decades to treat various waste streams and to produce methane-rich biogas as an important energy carrier, and it has become a major player in electrical power production. AD is a popular, mature technology, and our knowledge about the influencing process parameters as well as about the diverse microbial communities involved in the process has increased dramatically over the last few decades. To avoid competition with food and feed production, the AD feedstock spectrum has constantly been extended to waste products either rich in recalcitrant lignocellulose or containing inhibitory substances such as ammonia, which requires application of various pre-treatments or specific management of the microbial resources. Extending the definition of AD, it can also convert gases rich in hydrogen and carbon dioxide into methane that can substitute natural gas, which opens new opportunities by a direct link to traditional petrochemistry. Furthermore, AD can be coupled with emerging biotechnological applications, such as microbial electrochemical technologies or the production of medium-chain fatty acids by anaerobic fermentation. Ultimately, because of the wide range of applications, AD is still a very vital field in science. This Special Issue highlights some key topics of this research field.

Anaerobic Co Digestion of Lignocellulosic Waste

Author : Luis Isidoro Romero García
File Size : 40.96 MB
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Some terms, such as eco-friendly, circular economy and green technologies, have remained in our vocabulary, because the truth is that mankind is altering the planet to put its own subsistence at risk. Besides, for rationalization in the consumption of raw materials and energy, the recycling of waste through efficient and sustainable processes forms the backbone of the paradigm of a sustainable industry. One of the most relevant technologies for the new productive model is anaerobic digestion. Historically, anaerobic digestion has been developed in the field of urban wastes and wastewater treatments, but in the new challenge, its role is more relevant. Anaerobic digestion is a technologically mature biological treatment, which joins bioenergy production with the efficient removal of contaminants. This issue provides a specialized, but broad in scope, overview of the possibilities of the anaerobic digestion of lignocellulosic biomass (mainly forestry and agricultural wastes), which is expected to be a more promising substrate for the development of biorefineries. Its conversion to bioenergy through anaerobic digestion must solve some troubles: the complex lignocellulosic structure needs to be deconstructed by pretreatments and a co-substrate may need to be added to improve the biological process. Ten selected works advance this proposal into the future.