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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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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 digestion --- solid digestate --- milling process --- sugars recovery --- energy balances --- bioethanol production --- biogas upgrading --- biomethane --- bio-succinic acid --- CO2 utilization --- feasibility assessment --- acetate --- lactate --- inoculum --- food waste --- sewage sludge --- lactic acid bacteria --- cattle manure --- steam explosion --- pre-treatment --- UASB --- co-digestion --- biogas --- high-rate anaerobic digestion --- energy recovery --- granular sludge --- renewable energy --- decentralized wastewater treatment --- two-stage anaerobic digestion --- Anammox --- enzyme application --- rheology of digestate --- methane --- aquaculture --- trout --- sludge --- wastewater --- drum sieve --- microfiltration --- settling --- waste-to-energy --- wet waste --- bioenergy --- techno-economic analysis --- ammonia inhibition --- chicken manure --- dairy cow manure --- high-solids anaerobic digestion --- inoculum adaptation --- volatile fatty acids --- dry batch anaerobic digestion --- percolation --- permeability --- Salmonella spp. --- Escherichia coli O157 --- Listeria monocytogenes --- Enterococcus faecalis --- Clostridium spp. --- digestate --- pathogens --- sustainable farming --- anaerobic digester --- antibiotics removal --- antimicrobial --- chlortetracycline --- Tylosin --- n/a

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This book draws together a small selection of full-length papers based on presentations given at the 27th European Biomass Conference and Exhibition held in Lisbon, Portugal in 2019. The topics covered, which reflect the breadth of the program of the EUBCE conference itself, include biomass sources, various aspects of technologies used for the conversion of biomass to bioproducts and bioenergy, as well as different approaches to assessing environmental impacts, which include case studies based on different technologies in use in a range of countries.

Technology: general issues --- bioeconomy --- bio-based industry --- biomass --- bioenergy --- industrial crop --- perennial crop --- low-input agriculture --- marginal land --- MALLIS --- sustainable agriculture --- HTC --- bio-coal --- manure --- slagging --- fouling --- corrosion --- process chemistry --- combustion --- waste to energy --- struvite --- HTL --- biorefinery --- renewable fuel --- HyFlexFuel --- rice harvest pellets --- palletization --- ash recovery --- normative --- anaerobic digestion --- methane production --- co-digestion --- combined heat and power --- farm-scale --- technical-economic analysis --- life cycle assessment --- greenhouse gas emission --- Ireland --- 5-hydroxymethylfurfural --- glucose --- heteropolyacid catalysts --- agroforestry --- waste valorization --- sustainable development goals --- renewable energy --- bioenergy transitions --- circular bioeconomy --- clean cooking --- life-cycle assessment --- energy policy --- barley straw --- torrefaction --- higher heating value --- severity factor --- sustainable development --- enhancement factor --- energy yield --- climate modelling --- climate change --- climate policy --- emission accounting --- global warming potential --- global temperature change potential --- greenhouse gas emissions --- impulse response function --- Bern Carbon Cycle model --- climate impacts of agriculture system --- conventional wheat --- olive trees --- silvopastoral --- acidification --- eutrophication --- energy crops --- miscanthus --- cardoon --- Paulownia tomentosa --- microalgae --- contaminated soils --- geographic information systems (GIS) --- ArcGIS --- adsorption --- ceramic filter --- gasification --- hot-gas cleaning --- lignocellulosic biomass --- cellulose pulp --- hydrolysis --- oxygen availability --- C:N ratio --- fermentation --- itaconic acid --- Aspergillus terreus --- bioeconomy --- bio-based industry --- biomass --- bioenergy --- industrial crop --- perennial crop --- low-input agriculture --- marginal land --- MALLIS --- sustainable agriculture --- HTC --- bio-coal --- manure --- slagging --- fouling --- corrosion --- process chemistry --- combustion --- waste to energy --- struvite --- HTL --- biorefinery --- renewable fuel --- HyFlexFuel --- rice harvest pellets --- palletization --- ash recovery --- normative --- anaerobic digestion --- methane production --- co-digestion --- combined heat and power --- farm-scale --- technical-economic analysis --- life cycle assessment --- greenhouse gas emission --- Ireland --- 5-hydroxymethylfurfural --- glucose --- heteropolyacid catalysts --- agroforestry --- waste valorization --- sustainable development goals --- renewable energy --- bioenergy transitions --- circular bioeconomy --- clean cooking --- life-cycle assessment --- energy policy --- barley straw --- torrefaction --- higher heating value --- severity factor --- sustainable development --- enhancement factor --- energy yield --- climate modelling --- climate change --- climate policy --- emission accounting --- global warming potential --- global temperature change potential --- greenhouse gas emissions --- impulse response function --- Bern Carbon Cycle model --- climate impacts of agriculture system --- conventional wheat --- olive trees --- silvopastoral --- acidification --- eutrophication --- energy crops --- miscanthus --- cardoon --- Paulownia tomentosa --- microalgae --- contaminated soils --- geographic information systems (GIS) --- ArcGIS --- adsorption --- ceramic filter --- gasification --- hot-gas cleaning --- lignocellulosic biomass --- cellulose pulp --- hydrolysis --- oxygen availability --- C:N ratio --- fermentation --- itaconic acid --- Aspergillus terreus

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• Reference Manager
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This book draws together a small selection of full-length papers based on presentations given at the 27th European Biomass Conference and Exhibition held in Lisbon, Portugal in 2019. The topics covered, which reflect the breadth of the program of the EUBCE conference itself, include biomass sources, various aspects of technologies used for the conversion of biomass to bioproducts and bioenergy, as well as different approaches to assessing environmental impacts, which include case studies based on different technologies in use in a range of countries.

bioeconomy --- bio-based industry --- biomass --- bioenergy --- industrial crop --- perennial crop --- low-input agriculture --- marginal land --- MALLIS --- sustainable agriculture --- HTC --- bio-coal --- manure --- slagging --- fouling --- corrosion --- process chemistry --- combustion --- waste to energy --- struvite --- HTL --- biorefinery --- renewable fuel --- HyFlexFuel --- rice harvest pellets --- palletization --- ash recovery --- normative --- anaerobic digestion --- methane production --- co-digestion --- combined heat and power --- farm-scale --- technical-economic analysis --- life cycle assessment --- greenhouse gas emission --- Ireland --- 5-hydroxymethylfurfural --- glucose --- heteropolyacid catalysts --- agroforestry --- waste valorization --- sustainable development goals --- renewable energy --- bioenergy transitions --- circular bioeconomy --- clean cooking --- life-cycle assessment --- energy policy --- barley straw --- torrefaction --- higher heating value --- severity factor --- sustainable development --- enhancement factor --- energy yield --- climate modelling --- climate change --- climate policy --- emission accounting --- global warming potential --- global temperature change potential --- greenhouse gas emissions --- impulse response function --- Bern Carbon Cycle model --- climate impacts of agriculture system --- conventional wheat --- olive trees --- silvopastoral --- acidification --- eutrophication --- energy crops --- miscanthus --- cardoon --- Paulownia tomentosa --- microalgae --- contaminated soils --- geographic information systems (GIS) --- ArcGIS --- adsorption --- ceramic filter --- gasification --- hot-gas cleaning --- lignocellulosic biomass --- cellulose pulp --- hydrolysis --- oxygen availability --- C:N ratio --- fermentation --- itaconic acid --- Aspergillus terreus