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

ABSTRACT 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.

Download full-text


Available from: Peter Weiland, Dec 13, 2013
1,716 Reads
  • Source
    • "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. "
    • "Thus, most of the H 2 S is chemically and biologically oxidized to S 0 (Kleinjan, 2005). This is possible because sulfide-oxidizing bacteria (SOB) are present in the sludge and proliferate in the digester (Weiland, 2010). Fdz-Polanco et al. (2009) achieved efficiencies of H 2 S removal higher than 99% in sewage sludge digesters (200 L) by injecting limited amounts of pure O 2 , thereby maintaining H 2 S concentrations of 50–500 mg/N m 3 , while the biogas production, CH 4 yield and volatile solids (VS) removal remained stable. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The application of microaerobic conditions during sludge digestion has been proven to be an efficient method for H2S removal from biogas. In this study, three microaerobic treatments were considered as an alternative to the technique of biogas desulfurization applied (FeCl3 dosing to the digesters) in a WWTP comprising three full-scale anaerobic reactors treating sewage sludge, depending on the reactant: pure O2 from cryogenic tanks, concentrated O2 from PSA generators, and air. These alternatives were compared in terms of net present value (NPV) with a fourth scenario consisting in the utilization of iron-sponge-bed filter inoculated with thiobacteria. The analysis revealed that the most profitable alternative to FeCl3 addition was the injection of concentrated O2 (0.0019€/m(3) biogas), and this scenario presented the highest robustness towards variations in the price of FeCl3, electricity, and in the H2S concentration. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 09/2015; 192. DOI:10.1016/j.biortech.2015.05.048 · 4.49 Impact Factor
  • Source
    • "The digestate can penetrate faster in the soil, and reduces the risk for nitrogen losses by ammonia emissions. Anaerobic digestion also results in a significant reduction of odors [2]. The anaerobic digestion process is able to inactivate weed seeds, bacteria (e.g. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The possibility of producing biogas and methane from two phases olive pomace was considered using anaerobic digestion and the microbial characteristic of digestate for the agrarian use was analyzed. In the work, the main aim was to obtain biogas, made from at least 50% methane, and a digestate that can be used in the field of agronomy, from the anaerobic digestion of the substrates. The tests were carried out by digesting different mixtures of the two-phase pomace, mulberry leaves and mud civil wastewater (pre-digested) in a batch system and in anaerobic mesophilic conditions (35 °C). The substrates were properly homogenized in order to obtain mixtures of known and uniform composition. The initial and final STi (Total Solids) and initial SVi (Volatile Solids), the concentration of chemical oxygen demand and total phenols were measured and the process yield (m3/t SV) was quantified with standard procedure. The objectives of the study were the analysis of microbial biodiversity developed during fermentation of mixtures based products and the microbial communities corresponding to Eubacteria, Archaea and Fungiwas analyzed. The suitability of the digestate for agronomical use was evaluated by estimating pathogens bacteria that may be present and by index of inhibition of plant organisms model.
Show more