Biogas production: current state and perspectives. Appl Microbiol Biot

Johann Heinrich von Thünen-Institute, Braunschweig, Germany.
Applied Microbiology and Biotechnology (Impact Factor: 3.34). 09/2009; 85(4):849-60. DOI: 10.1007/s00253-009-2246-7
Source: PubMed


Anaerobic digestion of energy crops, residues, and wastes is of increasing interest in order to reduce the greenhouse gas emissions and to facilitate a sustainable development of energy supply. Production of biogas provides a versatile carrier of renewable energy, as methane can be used for replacement of fossil fuels in both heat and power generation and as a vehicle fuel. For biogas production, various process types are applied which can be classified in wet and dry fermentation systems. Most often applied are wet digester systems using vertical stirred tank digester with different stirrer types dependent on the origin of the feedstock. Biogas is mainly utilized in engine-based combined heat and power plants, whereas microgas turbines and fuel cells are expensive alternatives which need further development work for reducing the costs and increasing their reliability. Gas upgrading and utilization as renewable vehicle fuel or injection into the natural gas grid is of increasing interest because the gas can be used in a more efficient way. The digestate from anaerobic fermentation is a valuable fertilizer due to the increased availability of nitrogen and the better short-term fertilization effect. Anaerobic treatment minimizes the survival of pathogens which is important for using the digested residue as fertilizer. This paper reviews the current state and perspectives of biogas production, including the biochemical parameters and feedstocks which influence the efficiency and reliability of the microbial conversion and gas yield.

    • "Due to the increasing global energy demand, renewable energy sources such as solar, wind and biomass have become more important. In this regard, especially the utilization of animal manure, energy crops and industrial food waste for the production of biogas, is an attractive alternative to fossil fuels [1] [2]. A multitude of microorganisms is responsible for the conversion of organic material to methane and carbon dioxide under anaerobic conditions [3]. "
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    Procedia Engineering 12/2015; 120:532-535. DOI:10.1016/j.proeng.2015.08.702
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    • "Abundance, low material cost, and high energy content make lignocellulosic biomass the preferred feedstock [4]. Lignocellulosic biomass produces both a clean biogas fuel as well as bioenergy residues that can be used as nutrient rich fertilizer, utilizing some of the energy of the chemical bonds within the biomass [5]. Importantly, the use of these agricultural residues in anaerobic digestion reduces the release of environmentally detrimental carbon dioxide and other greenhouse gases into the atmosphere. "
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    • "The high volumetric methane content of the biogas promises an equally high energy yield. Methane production via anaerobic digestion is a process consisting of four main stages, hydrolysis, acidogenesis, acetogenesis/dehydrogenation , and methanation, which are carried out by different consortia of anaerobic microorganisms [5]. In the first hydrolytic stage, complex polymers such as carbohydrates, proteins, and lipids are converted into soluble oligomers and monomers. "
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