Evaluation of straw as a biofilm carrier in the methanogenic stage of two-stage anaerobic digestion of crop residues.
TL;DR: Straw was evaluated as a biofilm carrier in the methanogenic stage of the two-stage anaerobic digestion of crop residues and it was found that straw would work very well in the intended application.
About: This article is published in Bioresource Technology.The article was published on 2002-10-01. It has received 94 citations till now. The article focuses on the topics: Straw & Anaerobic digestion.
Citations
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TL;DR: Current optimisation techniques associated with anaerobic digestion are reviewed and possible areas where improvements could be made are suggested, including the basic design considerations of a single or multi-stage reactor configuration, the type, power and duration of the mixing regime and the retention of active microbial biomass within the reactor.
1,383 citations
Cites background from "Evaluation of straw as a biofilm ca..."
...The use of straw as a biofilm carrier in a packed bed was found to have a greater methane production than a glass packed bed or suspended plastic carriers (Andersson and Bjornsson, 2002)....
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TL;DR: In this paper, different policies and policy instruments, as well as other factors, which influence a potential expansion of Swedish biogas systems, are identified and evaluated, and the existing incentives and barriers can be divided into those affecting the production of Biogas, and those affecting its utilisation.
296 citations
Cites background from "Evaluation of straw as a biofilm ca..."
...benefits in the form of reduced nitrogen leaching from arable land and improved efficiency in the use of plant nutrients (Andersson and Björnsson, 2002; Börjesson and Berglund, 2003, 2005; Svensson et al., 2005a; Sommer and Hutchings, 2001; SJV, 2004)....
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TL;DR: In this paper, the effects of increasing concentration of potato waste expressed as percentage of total solids and the initial inoculum-to-substrate ratio (ISR) on methane yield and productivity were investigated.
278 citations
Additional excerpts
...5 TWh per year to a predicted value of 14 TWh per year [9]....
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TL;DR: The roles of the diverse populations of micro‐organisms responsible for biodegradation of organic matter to form methane and carbon dioxide are rudimentarily understood and links between microbial communities and the rate limiting, hydrolytic stage of two‐stage biogas production from energy crops are expanded.
Abstract: Aims: The roles of the diverse populations of micro-organisms responsible for biodegradation of organic matter to form methane and carbon dioxide are rudimentarily understood. To expand the knowledge on links between microbial communities and the rate limiting, hydrolytic stage of two-stage biogas production from energy crops, this study was performed. Methods and Results: The process performance. and microbial communities (as determined by fluorescence in situ hybridization) in two separate two-stage batch digestions of sugar beets and grass/clover were studied. The microbial populations developed in the hydrolytic stage of anaerobic digestion of beets and grass/clover showed very few similarities, despite that the hydrolysis dynamics were similar. In both substrates, the solubilization of organic material was rapid for the first 10 days and accompanied by a build-up of volatile fatty acids (VFAs) and lactate. Between days 10 and 15, VFA and lactate concentrations decreased, as did the solubilization rates. For both substrates, Archaea started to appear in the hydrolytic stage between days 10 and 15, and the fraction of Bacteria decreased. The major bacterial group detected in the leachate fraction for beets was Alphaproteobacteria, whereas for grass/clover it was Firmicutes. The number of cells that bound to probes specifically targeting bacteria with cellulolytic activity was higher in the digestion of grass than in the digestion of beet. Conclusions: This study allowed the identification of the general bacterial groups involved, and the identification of a clear shift in the microbial population when hydrolysis rate became limiting for each of the substrates investigated. Significance and Impact of the Study: The findings from this study could be considered as a first step towards the development of strategies to stimulate hydrolysis further and ultimately increasing the methane production rates and yields from reactor-based digestion of these substrates.
215 citations
Cites background or methods from "Evaluation of straw as a biofilm ca..."
...The majority of the anaerobic digesters in use today are designed as one-stage slurry digestion systems to treat materials with high water content, like sewage sludge and liquid manure (Andersson and Björnsson 2002)....
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...The majority of the anaerobic digesters in use today are designed as one-stage slurry digestion systems to treat materials with high water content, like sewage sludge and liquid manure (Andersson and Björnsson 2002)....
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...SCOD, lactate and VFAs were determined as previously described (Andersson and Björnsson 2002)....
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...SCOD, lactate and VFAs were determined as previously described (Andersson and Björnsson 2002)....
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TL;DR: In this paper, the efficiency of a simple two-stage anaerobic digestion process was investigated for stabilisation and biomethanation of solid potato waste and sugar beet leaves, both separately and in co-digestion.
Abstract: There is a large, unutilised energy potential in agricultural waste fractions. In this pilot-scale study, the efficiency of a simple two-stage anaerobic digestion process was investigated for stabilisation and biomethanation of solid potato waste and sugar beet leaves, both separately and in co-digestion. A good phase separation between hydrolysis/acidification and methanogenesis was achieved, as indicated by the high carbon dioxide production, high volatile fatty acid concentration and low pH in the acidogenic reactors. Digestion of the individual substrates gave gross energy yields of 2.1–3.4 kWh/kg VS in the form of methane. Co-digestion, however, gave up to 60% higher methane yield, indicating that co-digestion resulted in improved methane production due to the positive synergism established in the digestion liquor. The integrity of the methane filters (MFs) was maintained throughout the period of operation, producing biogas with 60–78% methane content. A stable effluent pH showed that the methanogenic reactors had good ability to withstand the variations in load and volatile fatty acid concentrations that occurred in the two-stage process. The results of this pilot-scale study show that the two-stage anaerobic digestion system is suitable for effective conversion of semi-solid agricultural residues as potato waste and sugar beet leaves.
212 citations
References
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Book•
01 Jan 1992
TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
Abstract: Set your standards with these standard methods. This is it: the most widely read publication in the water industry, your all-inclusive reference tool. This comprehensive reference covers all aspects of USEPA-approved water analysis methods. More than 400 methods - all detailed step-by-step; 8 vibrant, full-color pages of aquatic algae illustrations; Never-before-seen figures that will help users with toxicity testing and the identification of apparatus used in the methods; Over 300 superbly illustrated figures; A new analytical tool for a number of inorganic nonmetals; Improved coverage of data evaluation, sample preservation, and reagant water; And much more!
78,324 citations
TL;DR: The technology of anaerobic digestion of organic solid wastes is, in many aspects, mature and its relation to composting technology is examined in this review.
1,725 citations
Journal Article•
TL;DR: In this paper, a review of the extensive literature data has been tabulated and ranked under various categories and the influence of several parameters on the methane potential of the feedstocks are presented.
745 citations
TL;DR: In this paper, a review of the literature on anaerobic microbial conversion of biomass to methane has been presented, highlighting the urgent need for evaluating the inumerable unexplored genera of plants as potential sources for methane production.
Abstract: Biological conversion of biomass to methane has received increasing attention in recent years. Hand- and mechanically-sorted municipal solid waste and nearly 100 genera of fruit and vegetable solid wastes, leaves, grasses, woods, weeds, marine and freshwater biomass have been explored for their anaerobic digestion potential to methane. In this review, the extensive literature data have been tabulated and ranked under various categories and the influence of several parameters on the methane potential of the feedstocks are presented. Almost all the land- and water-based species examined to date either have good digestion characteristics or can be pre-treated to promote digestion. This review emphasizes the urgent need for evaluating the inumerable unexplored genera of plants as potential sources for methane production.
731 citations
TL;DR: In this paper, a study was made on the development of digestion capacity for solid waste in Europe, which was limited to plants in operation or under construction that were treating at least 10% organic solid waste coming from market waste or municipal solid waste.
484 citations