Characterization of the methanogenic Archaea within two-phase biogas reactor systems operated with plant biomass

Klocke, Michael; Nettmann, Edith; Bergmann, Ingo; Mundt, K.; Souidi, Khadidja; Mumme, Jan; Linke, Bernd

doi:10.1016/j.syapm.2008.02.003

Cited by 98 publications

(75 citation statements)

References 47 publications

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“…H 2 and formate are of outstanding importance in electron transfer between syntrophic donor bacteria and the accepting methanogens [32,33,44,45]. Along with syntrophic oxidation of other process intermediates, syntrophic acetate oxidation (SAO) was shown by results of different approaches to prevail in high throughput biogas processes, high-performance biogas plants particularly at high temperature and at high ammonia concentration [46][47][48][49][50][51][52]. The predominance of SAO in these processes is in contradiction to various textbooks assigning 70% of the methane to be produced by acetate splitting and only 30% via the hydrogenotrophic pathway.…”

Section: Microbiology and Process Controlmentioning

confidence: 99%

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Agricultural biogas production in Germany - from practice to microbiology basics

2014

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Worldwide, anaerobic digestion for sanitation and utilization of the produced biogas as energy carrier have a long-standing history. Concomitantly, digested residues from biogas plants are utilized as valuable fertilizers in crop production. In Germany, guaranteed prices for electricity generated from renewable sources pushed the number of biogas plants from about 140 in 1992 to about 7,720 by the end of 2013, and the share of electricity supply from biogas close to 4.5%. In the midterm, biogas is given considerable potential to fill up the residual load from electricity generation based on wind and photovoltaic. In this review, we give an overview of the state-of-the-art of biogas technology for energy supply from agricultural inputs, based mainly on the situation in Germany. Focus is placed on the monitoring and control (M&C) of biogas plants as a means of meeting the growing demands for productivity and reliability of biogas supply. We summarize prominent factors for the stability and productivity of the anaerobic digestion (AD) process, and present latest findings about molecular biology tools, bioindicators, the 'metabolic quotient' and cDNA/DNA ratios for process analysis. In view of the large diversity of agricultural biogas installations, we discuss the cost-benefit ratio of M&C effort and equipment. In the light of the transformation of the energy system in Germany towards renewable sources ('Energiewende'), we give an outlook on prospects and concepts for the future role of biogas technology in agriculture and energy supply. We also address recent misguided developments, as the sustainable development of biogas technology in agriculture can only be realized within the ecological, economical, and social boundaries of underlying agro-ecological systems.Keywords: Agriculture; Biogas production; Process control; Engineering; Microbiology; Molecular biology; Early-warning; Energy supply on demand ReviewThe most prominent beneficial features of the anaerobic digestion (AD) process are generation of biogas as a renewable energy carrier based on solar energy stored in biomass and hygienization of the input material during the treatment. Although it turns out from the following section that making use of hygienization is invaluable and has a long-standing history, the focus of this manuscript is on energy supply from biogas. The intent is to highlight the role of biogas production in a sustainable renewable energy framework in order to counteract consequences of the unsustainable resource management in the last century. Moreover, intensifying sustainable energy use has gained particular importance since the recent catastrophes with nuclear energy.This article builds on recent reviews by Weiland [1] and Braun et al. [2] on the state of biogas production in 2010, with emphasis on the development in Germany. In the last few years, the role of biogas as envisaged in the German renewable energy concept (see 'The role of biogas within the German energy supply system' section) has fuelled respective research a...

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Section: Microbiology and Process Controlmentioning

confidence: 99%

“…of a monophasic biogas process are considered. Other processes such as biphasic systems [47] are not within the scope of this review.…”

Section: Microbiology and Process Controlmentioning

confidence: 99%

Agricultural biogas production in Germany - from practice to microbiology basics

2014

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“…Krakat et al [67,68] demonstrated that a higher temperature of 60 °C and a drastic reduction in hydraulic retention time resulted in dominance of hydrogenotrophs among the microbial communities with a corresponding increase in methane production in thermophilic and mesophilic biogas fermentors respectively, digesting energy crops. Similarly, Klocke et al [69,70] reported varying substrate utilization during methanogenesis within the biogas plant as depicted from the dominance fraction of hydrogenotrophic methanogens relative to acetoclastic counterparts.…”

Section: Syntrophic Acetogensmentioning

confidence: 94%

Microbial Anaerobic Digestion (Bio-Digesters) as an Approach to the Decontamination of Animal Wastes in Pollution Control and the Generation of Renewable Energy

Manyi-Loh¹,

Mamphweli²,

Meyer³

et al. 2015

Biological Treatment of Solid Waste

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Abstract:With an ever increasing population rate; a vast array of biomass wastes rich in organic and inorganic nutrients as well as pathogenic microorganisms will result from the diversified human, industrial and agricultural activities. Anaerobic digestion is applauded as one of the best ways to properly handle and manage these wastes. Animal wastes have been recognized as suitable substrates for anaerobic digestion process, a natural biological process in which complex organic materials are broken down into simpler molecules in the absence of oxygen by the concerted activities of four sets of metabolically linked microorganisms. This process occurs in an airtight chamber (biodigester) via four stages represented by hydrolytic, acidogenic, acetogenic and methanogenic microorganisms. The microbial population and structure can be identified by the combined use of culture-based, microscopic and molecular techniques. Overall, the process is affected by bio-digester design, operational factors and manure characteristics. The purpose of anaerobic digestion is the production of a renewable energy source (biogas) and an odor

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“…Therefore, different types of organic wastes such as sewage sludge, industrial wastes, slaughterhouse waste, fruit and vegetable wastes, manure and agricultural biomass have been successfully digested under anaerobic conditions. Each of these wastes has been digested separately or co-digested with other wastes [10][11][12].However, not many papers have been published on the mono-digestion of crop residues [13][14][15][16], while thermophilic AD has been mainly the subject of more recent studies.The organic loading rate and hydrologic retention time (HRT) are two major parameters used for sizing a digester, and their optimum values are specific to each substrate as well as DOI: http://dx.doi.org/ …”

mentioning

confidence: 99%

“…However, not many papers have been published on the mono-digestion of crop residues [13][14][15][16], while thermophilic AD has been mainly the subject of more recent studies.…”

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confidence: 99%

Effects of digestion temperatures and loading amounts on methane production from anaerobic digestion with crop residues

Shin¹,

Park²,

Lee³

et al. 2015

Carbon letters

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Due limited natural resources and increased greenhouse gas emissions, substitution of fossil fuels with renewable bio-energy has been encouraged United Nations Framework Convention on Climate Change (UNFCCC). According to the United Nations, by the year 2050, up to 77% of the world's energy demand could be supplied by renewable energy sources [1]. However, because biomass has gained economic interest, further expansion of biogas production is increasingly dependent on the exploitation of new sources of biomass.Biomass is composed of carbon-rich materials including plant residues, animal excrements and bio-waste from households and industry [2]. Unused or discarded biomass residues from agriculture are a potential energy resource, even though those materials can be a source of green house gas (GHG) emissions causing climate change. The potential energy production from crop residues and animal wastes is globally estimated at about 34 EJ (exajoule = 10 18 joules) out of a total 70 EJ [3]. Biomass is a renewable energy resource derived from all organic materials produced by both human and natural activities. It is a complex mixture of carbohydrates, fats and proteins. Plant residues are regarded as the main source of biomass because they usually contain 40%-50% cellulose, 20%-35% hemi-cellulose, and 15%-30% lignins. Therefore, biomasses like the plant residues of grapeseed, rice, barley and wheat could serve as alternative bio-energy resources.The grand total of generated waste from livestock, agro-industrial waste and crop residues is estimated at 58,010 kt yr -1 in Korea. Potential methane production from agricultural wastes including livestock, crop residues and agro-industrial wastes is estimated at 436 kt yr -1 [4]. Anaerobic digestion (AD) for methane production using crop residues in the agricultural sector is becoming necessary in areas with limited natural resources like Korea. Over the past decade, AD of biomass originating from agriculture to produce methane gas has attracted much attention from government authorities, academia, and industry in Korea.AD is a biological process that converts the solid or liquid biomass into a gas in the absence of oxygen. Many studies on AD in Korea have focused on swine manure and food wastes as substrates [5][6]. AD has many environmental benefits including the production of a renewable energy carrier, nutrient recycling and the reduction of waste volumes [7][8][9]. Therefore, different types of organic wastes such as sewage sludge, industrial wastes, slaughterhouse waste, fruit and vegetable wastes, manure and agricultural biomass have been successfully digested under anaerobic conditions. Each of these wastes has been digested separately or co-digested with other wastes [10][11][12].However, not many papers have been published on the mono-digestion of crop residues [13][14][15][16], while thermophilic AD has been mainly the subject of more recent studies.The organic loading rate and hydrologic retention time (HRT) are two major parameters used for sizing a digester, an...

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Characterization of the methanogenic Archaea within two-phase biogas reactor systems operated with plant biomass

Cited by 98 publications

References 47 publications

Agricultural biogas production in Germany - from practice to microbiology basics

Agricultural biogas production in Germany - from practice to microbiology basics

Microbial Anaerobic Digestion (Bio-Digesters) as an Approach to the Decontamination of Animal Wastes in Pollution Control and the Generation of Renewable Energy

Effects of digestion temperatures and loading amounts on methane production from anaerobic digestion with crop residues

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