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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.

Technology: general issues --- exhausted sugar beet pulp --- pig manure --- anaerobic co-digestion --- thermophilic --- lignocellulosic waste --- anaerobic digestion --- biogas --- optimization --- operating parameters --- review --- particle-rich substrate --- suspended solids disintegration --- disintegration kinetics --- cellulase --- lignocellulosic biomass --- pretreatment methods --- limitations --- hydro-thermal pretreatment --- biofuels --- feedstock and degradation pathway --- AD systems --- pretreatment technologies --- process stability --- codigestion --- rice straw --- nutrients --- recycling --- digestate --- methane --- corn residue --- organosolv pretreatment --- sugar beet by-products --- manure --- semi-continuous feeding mode --- methane improvement --- non-classical parameters --- sorghum mutant --- biomass --- soluble sugars --- dilute acid pretreatment --- one-pot process --- n/a

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Moving towards a sustainable and green economy requires the use of renewable resources for the production of fuels, chemicals, and materials. In such a scenario, the use of lignocellulosic biomass and waste streams plays an important role, as it consists of abundant renewable resources. The complex nature of lignocellulosic biomass dictates the use of a pretreatment process prior to any further processing. Traditional methods of biomass pretreatment fail to recover cellulose, hemicellulose, and lignin in clean streams. It has been recognized that the efficient use of all the main fractions of lignocellulosic biomass (cellulose, hemicellulose, and lignin) is an important step towards a financially sustainable biomass biorefinery. In this context, switching from biomass pretreatment to biomass fractionation can offer a sustainable solution to recover relatively clean streams of cellulose, hemicellulose, and lignin. This Special issue aims at exploring the most advanced solutions in biomass and waste pretreatment and fractionation techniques, together with novel (thermo)chemical and biochemical processes for the conversion of fractionated cellulose, hemicellulose and lignin to bioenergy, bio-based chemicals, and biomaterials, including the application of such products (i.e., use of biochar for filtration and metallurgical processes), as well as recent developments in kinetic, thermodynamic, and numeric modeling of conversion processes. The scope of this Special Issue will also cover progress in advanced measuring methods and techniques used in the characterization of biomass, waste, and products.

Technology: general issues --- Acacia tortilis --- biofuel --- biomass --- pine dust --- pyrolysis --- Napier grass --- bioethanol --- biomass fractionation --- enzyme hydrolysis --- acid pretreatment --- alkali pretreatment --- microwave-assisted pretreatment --- pretreatment parameters --- enzymatic hydrolysis --- glucose --- xylose --- lignocellulosic sugars --- microbial lipid --- olive mill wastewater --- Cryptococcus curvatus --- Lipomyces starkeyi --- lignin --- organosolv fractionation --- TGA --- 31P NMR --- HSQC --- heat treatment --- charcoal --- electrical resistivity --- coal --- coke --- high-temperature treatment --- organosolv --- Kraft lignin --- etherification --- lignin functionalization --- thermoplastics --- oxidative lignin upgrade --- catalytic lignin oxidation --- vanadate --- molybdate --- ionosolv --- biomimetic --- bio-based reductant --- ferroalloy industry --- kiln --- 2nd generation sugars --- lignocellulose --- hydrolyzate --- biorefinery --- furfural --- hydroxymethylfurfural --- bioeconomy --- life cycle assessment --- sustainable biomass growth --- mining --- metallurgical coke --- n/a

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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.

exhausted sugar beet pulp --- pig manure --- anaerobic co-digestion --- thermophilic --- lignocellulosic waste --- anaerobic digestion --- biogas --- optimization --- operating parameters --- review --- particle-rich substrate --- suspended solids disintegration --- disintegration kinetics --- cellulase --- lignocellulosic biomass --- pretreatment methods --- limitations --- hydro-thermal pretreatment --- biofuels --- feedstock and degradation pathway --- AD systems --- pretreatment technologies --- process stability --- codigestion --- rice straw --- nutrients --- recycling --- digestate --- methane --- corn residue --- organosolv pretreatment --- sugar beet by-products --- manure --- semi-continuous feeding mode --- methane improvement --- non-classical parameters --- sorghum mutant --- biomass --- soluble sugars --- dilute acid pretreatment --- one-pot process --- n/a

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Biofuels have recently attracted a lot of attention, mainly as alternative fuels for applications in energy generation and transportation. The utilization of biofuels in such controlled combustion processes has the great advantage of not depleting the limited resources of fossil fuels while leading to emissions of greenhouse gases and smoke particles similar to those of fossil fuels. On the other hand, a vast amount of biofuels are subjected to combustion in small-scale processes, such as for heating and cooking in residential dwellings, as well as in agricultural operations, such as crop residue removal and land clearing. In addition, large amounts of biomass are consumed annually during forest and savanna fires in many parts of the world. These types of burning processes are typically uncontrolled and unregulated. Consequently, the emissions from these processes may be larger compared to industrial-type operations. Aside from direct effects on human health, especially due to a sizeable fraction of the smoke emissions remaining inside residential homes, the smoke particles and gases released from uncontrolled biofuel combustion impose significant effects on the regional and global climate. Estimates have shown the majority of carbonaceous airborne particulate matter to be derived from the combustion of biofuels and biomass. “Production of Biofuels and Numerical Modelling of Chemical Combustion Systems” comprehensively overviews and includes in-depth technical research papers addressing recent progress in biofuel production and combustion processes. To be specific, this book contains sixteen high-quality studies (fifteen research papers and one review paper) addressing techniques and methods for bioenergy and biofuel production as well as challenges in the broad area of process modelling and control in combustion processes.

Research & information: general --- Technology: general issues --- microalgae --- hydrothermal liquefaction --- pretreatment --- low O and N biocrude --- biodiesel --- esterification --- free fatty acids --- glycerol --- waste cooking oil --- Computational Fluid Dynamics --- two-stroke --- dual-fuel engine --- simulation --- pre-combustion chamber --- internal combustion engine --- particulate matter emissions --- biomorphic silicon carbide --- vegetal waste --- diesel particulate filter --- biocrude --- metal-oxide catalyst --- bioethanol --- dilute acid pretreatment --- enzymatic hydrolysis --- olive stones --- Pachysolen tannophilus --- response surface methodology --- compression ignition --- direct injection --- cryogenic gas --- diesel engines --- dual fuel engines --- natural gas --- greenhouse gas emissions --- particulate matter --- carotenoids --- extremophiles --- microalgal biotechnology --- eucalyptus kraft lignin --- tree leaf --- pellet --- additive --- biofuel --- circular economy --- piston bowl --- alternative fuel --- vanes --- emulsified biofuel --- combustion --- gasification --- olive --- olive oils --- olive-pruning debris --- olive pomaces --- pyrolysis --- biogas --- environmental impact --- life cycle assessment --- olive pomace --- sustainability --- TGA --- hemicellulose --- cellulose --- lignin --- pseudocomponent kinetic model --- biomass --- culture --- scale-up --- Phaeodactylum tricornutum --- burning characteristics --- fatty acid methyl ester --- added water content --- fuel structure --- distillation temperature --- layered double hydroxide --- toluene steam reforming --- tar --- Ni-based catalyst --- hydrotalcite --- hydrogen production --- n/a

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The subject of this book is ""Biofuel and Bioenergy Technology"". It aims to publish high-quality review and research papers, addressing recent advances in biofuel and bioenergy. State-of-the-art studies of advanced techniques of biorefinery for biofuel production are also included. Research involving experimental studies, recent developments, and novel and emerging technologies in this field are covered. This book contains twenty-seven technical papers which cover diversified biofuel and bioenergy technology-related research that have shown critical results and contributed significant findings to the fields of biomass processing, pyrolysis, bio-oil and its emulsification; transesterification and biodiesel, gasification and syngas, fermentation and biogas/methane, bioethanol and alcohol-based fuels, solid fuel and biochar, and microbial fuel cell and power generation development. The published contents relate to the most important techniques and analyses applied in the biofuel and bioenergy technology.

equilibrium model --- simulation --- syngas --- waste biomass --- calcination --- polymer electrolyte membrane --- combined pretreatment --- anaerobic digestion --- alkali pretreatment --- validation --- biodiesel --- synergistic effect --- relative humidity --- unbleached paper --- synergistic effects --- waste wood --- RSM --- stone fruit --- corn stover --- microbial community --- fatty acid methyl ester --- acid pretreatment --- energy exchange --- coal-fired flue-gas --- bio-electro-Fenton microbial fuel cells (Bio-E-Fenton MFCs) --- SOFC --- lignocellulose --- bio-oils --- diesel --- seed oil --- Clostridiales --- liquefaction --- sewage sludge --- counter-flow structure --- lignin recovery --- Vietnam --- iodine value --- hydrodynamic boundary layer --- energy yield --- second-generation biodiesel --- CHO index --- Jerusalem artichoke --- Carica papaya --- mass yield --- biochemical methane potential --- Chlorella --- engine performance --- emulsification --- single cell oil --- chemical oxygen demand (COD) --- anaerobic fermentation --- superabsorbent polymer --- isopropanol --- viscosity --- esterification --- mathematical modeling --- charge transfer resistance --- ball mill --- Annona muricata --- membrane bioreactors --- ethanol organosolv --- direct transesterification --- Methanothermobacter --- screening --- Rhodotorula glutinis --- pyrolytic oil --- acetone --- soursop --- degradation --- torrefaction --- alcohols --- electroactive biofilm --- nitric acid --- organosolv pretreatment --- optimisation --- digester performance --- biodiesel production --- air-steam gasification --- acidity index --- prairie cord grass --- thermophoretic force --- recirculation mode --- wastewater --- alkanes --- tar --- biogas production --- two-step process --- thermogravimetric analysis --- electrochemical hydrogenation --- enzymatic hydrolysis --- herbaceous biomass --- hydrogen/carbon monoxide ratio --- solid biofuel --- biodiesel testing --- catalyst --- exergy --- membrane contamination --- characterisation --- Nejayote --- methane --- photo catalyst --- gross calorific value --- bioreactors --- wastewater treatment --- response surface methodology --- MFC --- redox potential reduction --- microbial biofuel --- ethanol fermentation --- mechanical durability --- Van Krevelen diagram --- biodiesel property --- direct interspecies electron transfer --- lignocellulosic biomass --- methane and carbon dioxide conversion --- liquid lipase --- non-premixed combustion --- hydrogen-producing bacteria --- surfactant --- Taguchi method --- shear rate --- carbon dioxide --- calorific value --- biomass fuel --- granular activated carbon --- porosity --- biogas --- Miscanthus --- mixotrophic cultivation --- first-law/second-law efficiency --- voltage --- microbial community composition --- small-scale biogas plants --- mechanical pretreatment --- developing countries --- transesterification --- process stability --- co-surfactant --- thermophilic anaerobic digestion --- tri-reforming process --- metabolic engineering --- exergy efficiency