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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 ...
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...
ProFuelDB : an open-access database of physiological properties of biofuel-prod...
Lourenço, C. P.; Pereira, M. A.; Lourenço, Anália; Sousa, D. Z.Anaerobic microorganisms are attractive for the synthesis of fuels and chemicals, but information on the physiology of culturable anaerobes is dispersed in scientific literature. Herewith we present the ProFuelDB, a web-based publicly available database prototype compiling information on the physiology of anaerobic prokaryotes with relevance for biofuels production. It is foreseen that this prototype will evolv...
A methodology for coupling DGGE and mathematical modelling : application in bio...
Tapia, Estela; Donoso-Bravo, Andres; Cabrol, Léa; Alves, M. M.; Pereira, M. A.; Rapaport, Alain; Ruiz-Filippi, GonzaloMolecular biology techniques provide valuable information in terms of microbial dynamic and evolution. DGGE analysis is one of the most popular methods, which has been used in bioprocess assessment. A novel procedure that combines common experimental measurements, DGGE and image analysis is presented as a new methodology for preliminary assessment. In this study, the methodology was applied as an example to the...
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...
Production of 1,3-propanediol in EGSB reactors by open mixed cultures using gly...
Gallardo, R.; Faria, C.; Pereira, M. A.; Rodrigues, L. R.; Alves, M. M.Two pre-treatments (granules disruption and heat) were applied to granular sludge to favour the production of 1,3-propanediol (1,3-PDO) from glycerol by non-methanogenic bacteria in expanded granular sludge blanket (EGSB) reactors. Different hydraulic retention times (HRT) were tested to achieve a maximum yield of 0.59 mol of 1,3-PDO/mol of glycerol in the control (no treatment) reactor at an HRT of 12 h. Molec...
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...
Influence of carrier concentration on the control of Galactomyces geotrichum bu...
Matos, M.; Pereira, M. A.; Nicolau, Ana; Rodrigues, A. L.; Brito, A. G.; Nogueira, R.The present work aims to evaluate a strategy to solve Galactomyces geotrichum bulking based on the incorporation of a biofilm carrier in activated sludge systems. For this study, four sequencing batch reactors (SBR) were operated without (SBR1) and with a carrier for biofilm growth (5% [SBR2], 10% [SBR3], and 20% [SBR4] of the reactor volume). As expected, G. geotrichum bulking was observed in the SBR operating...
Bioaugmentation of sewage sludge with Trametes versicolor in solid-phase biopil...
Rodríguez-Rodríguez, C.E.; Jelic, A.; Pereira, M. A.; Sousa, D. Z.; Petrovic, M.; Alves, M. M.; Barceló, D.; Caminal, G.; Vicent, T.The use of sludge (biosolids) in land application may contribute to the spread of organic micropollutants as wastewater treatments do not completely remove these compounds. Therefore, the development of alternative strategies for sludge treatment is a matter of recent concern. The elimination of pharmaceuticals at pre-existent concentrations from sewage sludge was assessed, for the first time, in nonsterile bio...
Influence of adsorption and anaerobic granular sludge characteristics on long c...
Palatsi, J.; Affes, R.; Fernandez, B.; Pereira, M. A.; Alves, M. M.; Flotats, X.The impact of LCFA adsorption on the methanogenic activity was evaluated in batch assays for two anaerobic granular sludges in the presence and absence of bentonite as synthetic adsorbent. A clear inhibitory effect at an oleate (C18:1) concentration of 0.5 g(C18:1) L(-1) was observed for both sludges. Palmitate (C16:0) was confirmed to be the main intermediate of C18:1 degradation in not adapted sludge and its ...
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