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Bioenergy is renewable energy obtained from biomass—any organic material that has stored sunlight in the form of chemical energy. Biogas is among the biofuels that can be obtained from biomass resources, including biodegradable wastes like manure, sewage sludge, the organic fraction of municipal solid wastes, slaughterhouse waste, crop residues, and more recently lignocellulosic biomass and algae. Within the framework of the circular economy, biogas production from biodegradable waste is particularly interesting, as it helps to save resources while reducing environmental pollution. Besides, lignocellulosic biomass and algae do not compete for arable land with food crops (in contrast with energy crops). Hence, they constitute a novel source of biomass for bioenergy.Biogas plants may involve both high-tech and low-tech digesters, ranging from industrial-scale plants to small-scale farms and even households. They pose an alternative for decentralized bioenergy production in rural areas. Indeed, the biogas produced can be used in heaters, engines, combined heat and power units, and even cookstoves at the household level. Notwithstanding, digesters are considered to be a sustainable technology that can improve the living conditions of farmers by covering energy needs and boosting nutrient recycling. Thanks to their technical, socio-economic, and environmental benefits, rural biogas plants have been spreading around the world since the 1970s, with a large focus on farm-based systems and households. However, several challenges still need to be overcome in order to improve the technology and financial viability.

Mixing --- optimised --- household digester --- Chinese dome digester (CDD) --- self-agitation --- blank --- mixing --- Chinese dome digester --- impeller mixed digester --- unstirred digester --- hydraulically mixed --- total solids (TS) concentration --- plug-flow reactor --- anaerobic digestion --- animal manures --- biogas --- unconfined gas injection mixing --- mixing recirculation --- biomethane potential tests --- Italy --- manure --- energy crops --- agriculture residues --- digestate --- biochemical methane potential --- micro-aeration --- iron --- bioenergy --- H2S scrubber --- methane --- fermentation --- dairy --- poultry --- absorbent --- ammonia --- inhibition --- acclimatization --- trace elements --- anaerobic treatment --- energy assessment --- rural sanitation --- sludge --- wastewater --- agricultural runoff --- biomethane --- biorefinery --- microalgae --- photobioreactor --- pretreatment --- low cost digester --- psychrophilic anaerobic digestion --- thermal behavior --- anaerobic co-digestion --- slaughterhouse wastewater --- synergistic effects --- kinetic modeling --- biodegradability

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Biomass can be used as feedstock for the production of biomaterials, chemicals, platform molecules and biofuels. It is the most reliable alternative to reduce fossil fuel consumption and greenhouse gas emissions. Within the framework of the circular economy, resource recovery from organic waste, including sewage sludge, biowaste, manure and slaughterhouse waste, is particularly useful, as it helps saving resources while reducing environmental pollution. In contrast to energy crops, lignocellulosic biomass and algae do not compete for food production; therefore, they represent an important source of biomass for bioenergy and bioproducts. However, biomass may require a pretreatment step in order to enhance its conversion into valuable products in terms of process yield and/or productivity. Furthermore, a pretreatment step may be mandatory for waste management (i.e., animal by-products).Pretreatment technologies are applied upstream of various conversion processes of biomass into biofuels or biomaterials, including bioethanol, biohydrogen, biomethane, biomolecules or bioproducts. Pretreatments may include mechanical, thermal, chemical and biological techniques, which represent a crucial, cost-intensive step for the development of biorefineries. Thus, research is needed to help identify the most effective, economic, and environmentally friendly pretreatment options for each feedstock. This Special Issue aims to gather recent developments of biomass pretreatments for bioproduct and biofuel production.

Technology: general issues --- biomass --- valorisation --- ionic liquid --- crystallinity --- enzymatic hydrolysis --- pre-treatment --- acidogenic fermentation --- hydrothermal treatment --- source separated organics --- volatile fatty acids --- particulate organics solubilization --- microbial community analysis --- Pennisetum alopecuroides --- dilute alkaline pretreatment --- ferric chloride pretreatment --- bioethanol --- biomethane --- citrus peel waste --- biorefinery --- biorefinery residues --- ADM1 --- anaerobic digestion --- aqueous ammonia soaking pre-treatment --- continuous --- digested manure fibers --- modelling --- acetic acid --- butyric acid --- HRT --- pH --- propionic acid --- steam treatment --- pretreatment --- lignocellulose --- biochemical methane potential --- lithium --- sugarcane bagasse --- saccharification --- glycosyl-hydrolase --- ToF-SIMS --- surface ion distribution --- second-generation ethanol --- microwave pretreatment --- grass biomass --- p-hydroxycinnamic acids extraction --- lignocellulosic biomass --- NaOH pretreatment --- bioreactor experiments --- inhibition --- grass lawn waste --- whole slurry --- separated fractions --- alkali --- acid --- energy balance --- economical assessment --- municipal sludge --- thermal pretreatment --- microwave --- contaminants of emerging concern --- personal care products --- antimicrobial disinfectants --- triclosan --- ultra-high performance liquid chromatography --- tandem mass spectrometry --- biogas production --- fruit and vegetable harvesting wastes --- process optimization --- thermo chemical pretreatment --- biogas yield --- waste activated sludge --- electro-Fenton --- disintegration --- dewaterability --- mechanical pretreatments --- agricultural wastes --- rheology --- physical properties

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Biomass corresponds to organic matter of animal, vegetable, microbial, or algal origin. Biomass use as feedstock for biomaterial, chemicals, platform molecules, biofuel or bioenergy are the most reliable alternatives to limit fossil fuel consumption and to reduce greenhouse gas emissions. Resource recovery from different kinds of waste, such as sludge, food waste, municipal solid waste, and animal waste (manure and slaughterhouse waste), is particularly interesting from an environmental point of view, as it also reduces environmental pollution. In addition, lignocellulosic biomass and algae, which do not compete for food production, represent an important source of renewable resources (i.e., energy and other value-added products). However, a pretreatment step is generally required before biomass (bio)-conversion into valuable products in order to increase the process yield and/or productivity.Pretreatments are applied upstream of various conversion processes of biomass into biofuel or biomaterial with valuable end products such as bioethanol, biohydrogen, biomethane, biomolecules or biomaterials. Pretreatments cover a wide range of processes that include mechanical, thermal, chemical and biological techniques. This step is recognized as crucial and cost intensive for the development of biorefineries. Thus, more research is necessary to identify the most effective and economical pretreatment options for different biomass sources.

New --- pretreatment --- process --- Pretreatment --- mechanisms --- modeling --- Environmental --- assessment --- Energy --- Economic --- Biomass --- fractionation --- for --- biorefinery --- Life --- cycle

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Biomass can be used as feedstock for the production of biomaterials, chemicals, platform molecules and biofuels. It is the most reliable alternative to reduce fossil fuel consumption and greenhouse gas emissions. Within the framework of the circular economy, resource recovery from organic waste, including sewage sludge, biowaste, manure and slaughterhouse waste, is particularly useful, as it helps saving resources while reducing environmental pollution. In contrast to energy crops, lignocellulosic biomass and algae do not compete for food production; therefore, they represent an important source of biomass for bioenergy and bioproducts. However, biomass may require a pretreatment step in order to enhance its conversion into valuable products in terms of process yield and/or productivity. Furthermore, a pretreatment step may be mandatory for waste management (i.e., animal by-products).Pretreatment technologies are applied upstream of various conversion processes of biomass into biofuels or biomaterials, including bioethanol, biohydrogen, biomethane, biomolecules or bioproducts. Pretreatments may include mechanical, thermal, chemical and biological techniques, which represent a crucial, cost-intensive step for the development of biorefineries. Thus, research is needed to help identify the most effective, economic, and environmentally friendly pretreatment options for each feedstock. This Special Issue aims to gather recent developments of biomass pretreatments for bioproduct and biofuel production.

Technology: general issues --- biomass --- valorisation --- ionic liquid --- crystallinity --- enzymatic hydrolysis --- pre-treatment --- acidogenic fermentation --- hydrothermal treatment --- source separated organics --- volatile fatty acids --- particulate organics solubilization --- microbial community analysis --- Pennisetum alopecuroides --- dilute alkaline pretreatment --- ferric chloride pretreatment --- bioethanol --- biomethane --- citrus peel waste --- biorefinery --- biorefinery residues --- ADM1 --- anaerobic digestion --- aqueous ammonia soaking pre-treatment --- continuous --- digested manure fibers --- modelling --- acetic acid --- butyric acid --- HRT --- pH --- propionic acid --- steam treatment --- pretreatment --- lignocellulose --- biochemical methane potential --- lithium --- sugarcane bagasse --- saccharification --- glycosyl-hydrolase --- ToF-SIMS --- surface ion distribution --- second-generation ethanol --- microwave pretreatment --- grass biomass --- p-hydroxycinnamic acids extraction --- lignocellulosic biomass --- NaOH pretreatment --- bioreactor experiments --- inhibition --- grass lawn waste --- whole slurry --- separated fractions --- alkali --- acid --- energy balance --- economical assessment --- municipal sludge --- thermal pretreatment --- microwave --- contaminants of emerging concern --- personal care products --- antimicrobial disinfectants --- triclosan --- ultra-high performance liquid chromatography --- tandem mass spectrometry --- biogas production --- fruit and vegetable harvesting wastes --- process optimization --- thermo chemical pretreatment --- biogas yield --- waste activated sludge --- electro-Fenton --- disintegration --- dewaterability --- mechanical pretreatments --- agricultural wastes --- rheology --- physical properties