Journal ArticleDOI
Anaerobic digestion of slaughterhouse by-products
Anette Hejnfelt,Irini Angelidaki +1 more
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In this paper, anaerobic digestion of animal byproducts was investigated in batch and semi-continuously fed, reactor experiments at 55°C and for some experiments also at 37°C.Abstract:
Anaerobic digestion of animal by-products was investigated in batch and semi-continuously fed, reactor experiments at 55 °C and for some experiments also at 37 °C. Separate or mixed by-products from pigs were tested. The methane potential measured by batch assays for meat- and bone flour, fat, blood, hair, meat, ribs, raw waste were: 225, 497, 487, 561, 582, 575, 359, 619 dm 3 kg −1 respectively, corresponding to 50–100% of the calculated theoretical methane potential. Dilution of the by-products had a positive effect on the specific methane yield with the highest dilutions giving the best results. High concentrations of long-chain fatty acids and ammonia in the by-products were found to inhibit the biogas process at concentrations higher than 5 g lipids dm −3 and 7 g N dm −3 respectively. Pretreatment (pasteurization: 70 °C, sterilization: 133 °C, and alkali hydrolysis (NaOH) had no effect on achieved methane yields. Mesophilic digestion was more stable than thermophilic digestion, and higher methane yield was noticed at high waste concentrations. The lower yield at thermophilic temperature and high waste concentration was due to ammonia inhibition. Co-digestion of 5% pork by-products mixed with pig manure at 37 °C showed 40% higher methane production compared to digestion of manure alone.read more
Citations
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A critical review on inhibition of anaerobic digestion process by excess ammonia.
TL;DR: It is emphasized that more profound knowledge on parameters influencing ammonia-inhibition is needed to apply appropriate control strategies to ensure a stable and undisturbed digestion of anaerobic digestion of N-rich organic-feedstock.
Journal ArticleDOI
Evaluation of energy efficiency of various biogas production and utilization pathways
TL;DR: In this paper, the authors evaluated the energy efficiency of different biogas systems, including single and co-digestion of multiple feedstock, different biogenetic pathways, and waste-stream management strategies.
Journal ArticleDOI
Anaerobic digestion of solid organic substrates in batch mode: An overview relating to methane yields and experimental procedures
TL;DR: In this review, the research works on the influence of different parameters of BMP determination have been discussed for critical and comparative evaluation and the extensive literature previously published dealing with BMP assays has been compiled and summarized.
Journal ArticleDOI
The effects of substrate pre-treatment on anaerobic digestion systems: a review.
TL;DR: Overall, substrates containing lignin or bacterial cells appear to be the most amendable to pre-treatment for enhancing AD, followed by energy crops/harvesting residues and organic waste from food industry and manure.
Journal ArticleDOI
Review of feedstock pretreatment strategies for improved anaerobic digestion: From lab-scale research to full-scale application.
Hélène Carrère,Georgia Antonopoulou,Rim Affes,Fabiana Passos,Audrey Battimelli,Gerasimos Lyberatos,Ivet Ferrer +6 more
TL;DR: In this paper, the most appropriate pretreatment for the main feedstocks of biogas plants is discussed, which can enhance the methane potential and/or anaerobic digestion rate, improving digester performance.
References
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Book
Standard methods for the examination of water and wastewater
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.
Journal ArticleDOI
Anaerobic digestion of swine manure: Inhibition by ammonia
TL;DR: A stable anaerobic degradation of swine manure with ammonia concentration of 6 g-N/litre was obtained in continuously stirred tank reactors with a hydraulic retention time of 15 days, at four different temperatures as discussed by the authors.
Journal ArticleDOI
Assessment of the anaerobic biodegradability of macropollutants
Irini Angelidaki,W.T.M. Sanders +1 more
TL;DR: This paper reviews the methods developed for determination of anaerobic biodegradability of macro-pollutants and main focus is paid to the final mineralization of organic compounds and the methane potential of compounds.
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Thermophilic anaerobic digestion of livestock waste: the effect of ammonia
TL;DR: A stable digestion of cattle manure could be maintained with ammonia concentrations up to 6 g N/l after 6 months of operation, however, the methane yield was reduced and the concentration of volatile fatty acids increased from 1 to 3 g/l as acetate, compared to controls with an ammonia concentration of 2.5 gN/l.
Journal ArticleDOI
Anaerobic digestion of organic solid poultry slaughterhouse waste--a review.
Esa Salminen,Jukka Rintala +1 more
TL;DR: The potential of anaerobic digestion for material recovery and energy production from poultry slaughtering by-products and wastes and the current experience of the anaerobia digestion treatment of these materials are reviewed.