Encontrados 246 documentos, a visualizar página 1 de 25
Carbon based materials as novel redox mediators for dye wastewater biodegradation
Pereira, Raquel; Pereira, M. F. R.; Alves, M. M.; Pereira, LucianaDue to their large-scale production and extensive application, dyes have turned serious pollutants when improperly handled and disposed, creating grave public health and environmental problems. One of the problems that textile industry is facing is related with the incomplete exhaustion of dyes onto textile fibres from an aqueous dyeing process, and the need to implement innovative and sustainable effluent trea...
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 ...
UV/TiO2 photocatalytic degradation of xanthene dyes
Pereira, Luciana; Pereira, Raquel; Oliveira, Catarina S.; Apostol, Laura; Gavrilescu, M.; Pons, M. N.; Zahraa, O.; Alves, M. M.UV/titanium dioxide (TiO2) degradation of two xanthene dyes, erythrosine B (Ery) and eosin Y (Eos), was studied in a photocatalytic reactor. Photocatalysis was able to degrade 98% of Ery and 73% of Eos and led to 65% of chemical oxygen demand removal. Experiments in buffered solutions at different initial pH values reveal the pH dependence of the process, with better results obtained under acidic conditions due...
Posttreatment of olive mill wastewater by immobilized TiO2 photocatalysis
Costa, J. C.; Alves, M. M.A photocatalytic reactor with UV/TiO2 was used for the post-treatment of olive mill wastewater after anaerobic digestion. A factorial experimental design was adopted to determine the statistical significance of each parameter tested, namely initial COD, pH, treatment time and recirculation flow, and possible interactions, in three response variables: phenols, colour, and COD removals. Removal efficiencies of 9...
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...
Modelling inhibitory effects of long chain fatty acids in the anaerobic digesti...
Zonta, Z.; Alves, M. M.; Flotats, X.; Palatsi, J.Mathematical modelling of anaerobic digestion process has been used to give new insights regarding dynamics of the long chain fatty acids (LCFA) inhibition. Previously published experimental data, including batch tests with clay mineral bentonite additions, were used for parameter identification. New kinetics were considered to describe the bio-physics of the inhibitory process, including: i) adsorption of LCFA...
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...
Quantitative image analysis for the characterization of microbial aggregates in...
Costa, J. C.; Mesquita, D. P.; Amaral, A. L.; Alves, M. M.; Ferreira, E. C.Quantitative image analysis techniques have gained an undeniable role in several fields of research during the last decade. In the field of biological wastewater treatment (WWT) processes, several computer applications have been developed for monitoring microbial entities, either as individual cells or in different types of aggregates. New descriptors have been defined that are more reliable, objective, and use...
Extreme thermophilic biohydrogen production from arabinose and glucose
Abreu, A. A.; Karakashev, Dimitar; Angelidaki, I.; Sousa, D. Z.; Alves, M. M.Continuous hydrogen production rate from arabinose was significantly higher than from glucose, when higher organic loading rate was used. This fact was associated to higher lactate production in the reactor fed with glucose. The higher concentration of lactate was not a consequence of bacterial community shift, and is likely related to changes in the main metabolic pathways of glucose catabolism.
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.
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||