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Biomethanation potential of biological and other wastes
Costa, J. C.; Sousa, D. Z.; Pereira, M. A.; Stams, A. J. M.; Alves, M. M.Anaerobic technology has been traditionally applied for the treatment of carbon rich wastewater and organic residues. Anaerobic processes can be fully integrated in the biobased economy concept for resource recovery. After a brief introduction about applications of anaerobic processes to industrial wastewater treatment, agriculture feedstock and organic fraction of municipal solid waste, the position of anaerob...
Genome analysis of Desulfotomaculum kuznetsovii strain 17T reveals a physiologi...
Visser, Michael; Worm, Petra; Muyzer, Gerard; Pereira, Inês A. C.; Schaap, Peter J.; Plugge, Caroline M.; Kuever, Jan; Parshina, Sofiya N.Desulfotomaculum kuznetsovii is a moderately thermophilic member of the polyphyletic spore-forming genus Desulfotomaculum in the family Peptococcaceae. This species is of interest because it originates from deep subsurface thermal mineral water at a depth of about 3000 m. D. kuznetsovii is a rather versatile bacterium as it can grow with a large variety of organic substrates, including short-chain and long-chai...
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...
Enrichment and microbial characterization of syngas converting anaerobic cultures
Alves, J. I.; Visser, Michael; Stams, A. J. M.; Plugge, Caroline M.; Alves, M. M.; Sousa, D. Z.Bioconversion of recalcitrant biomass/waste into bulk chemicals or biofuels is often not feasible. By gasification of these materials, syngas (mainly composed of CO2, CO and H2) is generated and can be used for the production of high value compounds by thermochemical or biotechnological processes. Here, three thermophilic cultures enriched with syngas mixtures or pure CO (T-Syn, T-Syn-CO and T-CO) were studied....
Effect of long-chain fatty acids (LCFA) on the prevalence and viability of hydr...
Sousa, D. Z.; Salvador, A. F.; Ramos, J.; Guedes, Ana P.; Barbosa, Sónia; Stams, A. J. M.; Alves, M. M.; Pereira, M. A.Anaerobic degradation of long-chain fatty acids (LCFA) is essential for efficient biogas production from complex lipid-containing wastewaters. Methanogens play a key role in this process, but the general idea is that LCFA exert a toxic effect towards these microorganisms that impairs good methane recovery. In this work, the effect of saturated (palmitate, C16:0) and unsaturated (oleate, C18:1) LCFA towards hydr...
Enrichment of anaerobic syngas-converting bacteria from thermophilic bioreactor...
Alves, J. I.; Stams, A. J. M.; Plugge, Caroline M.; Alves, M. M.; Sousa, D. Z.Thermophilic (55 °C) anaerobic microbial communities were enriched with a synthetic syngas mixture (composed of CO, H2, and CO2) or with CO alone. Cultures T-Syn and T-CO were incubated and successively transferred with syngas (16 transfers) or CO (9 transfers), respectively, with increasing CO partial pressures from 0.09 to 0.88 bar. Culture T-Syn, after 4 successive transfers with syngas, was also incubated w...
1,3-Propanediol production from glycerol by a newly isolated Trichococcus strain
Van Gelder, A.H.; Aydin, R.; Alves, M. M.; Stams, A. J. M.A coccal bacterium (strain ES5) was isolated from methanogenic bioreactor sludge with glycerol as the sole energy and carbon source. Strain ES5 fermented glycerol to 1,3-propanediol as main product, and lactate, acetate and formate as minor products. The strain was phylogenetically closely related to Trichococcus flocculiformis; the rRNA gene sequence similarity was 99%. However, strain ES5 does not show the ty...
Role of syntrophic microbial communities in high-rate methanogenic bioreactors
Stams, A. J. M.; Sousa, D. Z.; Kleerebezem, Robbert; Plugge, Caroline M.Anaerobic purification is a cost-effective way to treat high strength industrial wastewater. Through anaerobic treatment of wastewaters energy is conserved as methane, and less sludge is produced. For high-rate methanogenesis compact syntrophic communities of fatty acid-degrading bacteria and methanogenic archaea are essential. Here, we describe the microbiology of syntrophic communities in methanogenic reactor...
Ecophysiology of syntrophic communities that degrade saturated and unsaturated ...
Sousa, D. Z.; Smidt, Hauke; Alves, M. M.; Stams, A. J. M.Syntrophic relationships are the key for biodegradation in methanogenic environments. We review the ecological and physiological features of syntrophic communities involved in the degradation of saturated and unsaturated long-chain fatty acids (LCFA), as well as their potential application to convert lipids/fats containing waste to biogas. Presently, about 14 species have been described with the ability to grow...
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