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Endurance of methanogenic archaea in anaerobic bioreactors treating oleate-base...
Salvador, A. F.; Cavaleiro, A. J.; Sousa, D. Z.; Alves, M. M.; Pereira, M. A.Methanogenic archaea are reported as very sensitive to lipids and long chain fatty acids (LCFA). Therefore, in conventional anaerobic processes, methane recovery during LCFA-rich wastewater treatment is usually low. By applying a start-up strategy, based on a sequence of step feeding and reaction cycles, an oleate-rich wastewater was efficiently treated at an organic loading rate of 21 kg COD m(-3) day(-1) (50 ...
Biochemical Methane Potential of raw and pre-treated meat-processing wastes
Cavaleiro, A. J.; Ferreira, T.; Pereira, F. R.; Tommaso, Giovana; Alves, M. M.Raw and pre-treated greaves and rinds, two meat-processing wastes, were assessed for biochemical methane potential (BMP). Combinations of temperature (25, 55, 70 and 120°C), NaOH (0.3 g g-1 waste volatile solids) and lipase from Candida rugosa (10 U g-1 fat) were applied to promote wastes hydrolysis, and the effect on BMP was evaluated. COD solubilisation was higher (66% for greaves; 55% for rinds) when greaves...
Addition of electron acceptors stimulates methanogenesis from lipids by anaerob...
Guedes, Ana P.; Cavaleiro, A. J.; Silva, Sérgio; Alves, M. M.; Stams, A. J. M.; Sousa, D. Z.Incubation of anaerobic sludge with triolein or oleate in the presence of nitrate or sulphate led to an increased methane production, relatively to incubations without inorganic electron acceptor. Faster methane production was obtained in assays amended with nitrate. Methanogenesis occurred after the reduction of alternative electron acceptors.
Non-syntrophic reactions in anaerobic unsaturated LCFA conversion by methanogen...
Cavaleiro, A. J.; Pereira, M. A.; Stams, A. J. M.; Alves, M. M.; Sousa, D. Z.Lipids are energy-rich compounds. This energy can be conserved as biogas in anaerobic bioreactors but the process is frequently hindered by long-chain fatty acids (LCFA) accumulation. LCFA catabolism is thought to occur via beta-oxidation, performed by anaerobic bacteria that live in obligatory syntrophy with H2 consuming methanogens, but the initial steps of unsaturated LCFA biodegradation are still unclear. I...
Sustainable bioenergy carriers from wastes
Pereira, M. A.; Cavaleiro, A. J.; Abreu, A. A.; Costa, J. C.; Sousa, D. Z.; Alves, M. M.The development of new technologies for renewable energy production is crucial for decreasing the reliance in fossil fuels and improving global sustainability. Waste materials are valuable resources that can be used for the production of energy carriers. Organic wastes can be anaerobically digested to ultimately produce methane. Hydrogen can be recovered from this process, if methanogenesis is inhibited. These ...
Bioaugmentation strategies to enhance long chain fatty acids (LCFA) conversion ...
Silva, Sérgio; Cavaleiro, A. J.; Alves, M. M.; Sousa, D. Z.Bioaugmentation of bioreactors with LCFA-degrading bacteria is a possibility for improving methane production from lipid-rich wastes/wastewaters. Cavaleiro et al. [1] has shown that methane production from oleate (unsaturated LCFA) is faster and more efficient in batch tests bioaugmented with Syntrophomonas zehnderi, a bacterium that is able to degrade a wide range of both saturated and unsaturated LCFA [2]. In...
Innovative start-up strategies for optimal methane production from lipids in an...
Cavaleiro, A. J.; Sousa, D. Z.; Alves, M. M.Lipids and long-chain fatty acids (LCFA) are energy-rich compounds that can be used as carbon and energy source by anaerobic microbial communities. Theoretically, large amounts of methane, a valuable energy carrier, may be generated during this process. However, operational problems, mainly associated with LCFA accumulation onto the sludge, have limited the use of anaerobic technology to produce methane from LC...
Methane production from oleate : assessing the bioaugmentation potential of Syn...
Cavaleiro, A. J.; Sousa, D. Z.; Alves, M. M.The potential for improving long-chain fatty acids (LCFA) conversion to methane was evaluated by bioaugmenting a non-acclimated anaerobic granular sludge with Syntrophomonas zehnderi. Batch bioaugmentation assays were performed with and without the solid microcarrier sepiolite, using 1 mM oleate as sole carbon and energy source. When S. zehnderi was added to the anaerobic sludge methane production from oleate w...
Bioaugmentation of anaerobic sludge with Syntrophomonas zehnderi as a Prospect ...
Cavaleiro, A. J.; Sousa, D. Z.; Alves, M. M.Manuscript revised ; Bioaugmentation of anaerobic sludge with long-chain fatty acids (LCFA)-degrading bacteria can be a feasible strategy to enhance methane production from LCFA. This hypothesis was studied in batch assays with Syntrophomonas zehnderi as bioaugmenting strain. This bacterium is able to degrade a wide range of saturated and unsaturated LCFA, and its presence has been reported in several oleate-f...
New perspectives for methane production from oleate : bioaugmentation of anaero...
Cavaleiro, A. J.; Sousa, D. Z.; Alves, M. M.Biogas production from waste lipids is a promising technology for sustainable energy production. In anaerobic bioreactors, lipids and long-chain fatty acids (LCFA) are easily removed from the liquid medium, mainly by adsorption. However, further LCFA degradation is rate-limiting and possible dependent on the development of syntrophic communities. Denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 1...
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