Navegando por Autor "Luna, H. J."
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Item Degradation of a model azo dye in submerged anaerobic membrane bioreactor (SAMBR) operated with powdered activated carbon (PAC).(2013) Baeta, Bruno Eduardo Lobo; Luna, H. J.; Sanson, Ananda Lima; Silva, Silvana de Queiroz; Aquino, Sergio Francisco deThis work investigated the anaerobic degradation of the model azo dye Remazol Yellow Gold RNL in an upflow anaerobic sludge blanket reactor (UASB) and two submerged anaerobic membrane (SAMBR) bioreactors, one of which (SAMBR-1) was operated with powdered activated carbon (PAC) in its interior. The reactors were operated at 35 _C with a hydraulic retention time of 24 h in three operational phases, aimed to assess the effect of external sources of carbon (glucose) or redox mediator (yeast extract) on the removal or color and organic matter. The results showed that removal efficiencies of COD (73e94%) and color (90e94%) were higher for SAMBR-1 when compared to SAMBR-2 (operated without PAC) and UASB reactors. In addition, the presence of PAC in SAMBR-1 increased reactor stability, thereby leading to a lower accumulation of volatile fatty acids (VFA). The microfiltration membrane was responsible for an additional removal ofw50% of soluble residual COD in the form of VFA, thus improving permeate quality. On its turn, PAC exhibited the ability to adsorb byproducts (aromatic amines) of azo dye degradation as well as to act as source of immobilized redox mediator (quinone groups on its surface), thereby enhancing color removal.Item EPS and SMP dynamics at different heights of a submerged anaerobicmembrane bioreactor (SAMBR).(2014) Luna, H. J.; Baeta, Bruno Eduardo Lobo; Aquino, Sergio Francisco de; Rodríguez Susa, M. S.Membrane bioreactors (MBR) technology for wastewater offers many advantages over conventional tech-nologies such as high effluent quality, less footprint and others. The main disadvantage of membranebioreactors (MBR) is related to membrane fouling, which is mainly caused by extracellular polymericsubstance (EPS) and soluble microbial products (SMP). This research studied EPS and SMP dynamics atdifferent heights of a submerged anaerobic membrane bioreactor (SAMBR). The SAMBR was operatedunder two organic loading rates (OLR) (0.79 and 1.56 kg/m3d) and was fed with synthetic wastewaterwith glucose as the carbon source. The results showed percentages of chemical oxygen demand (COD)removal above 95% and the highest COD removal rates were observed at the bottom of the reactor (>83%)for both OLR. The EPS showed a stratification with highest quantities in the supernatant. For the SMP thehighest concentration was in the bottom of SAMBR where utilization predominated associated productswhereas in the SAMBR supernatant predominated biomass associated products. The OLR change led to asignificant increase in SMP accumulation but not in EPS. These facts showed that EPS and SMP dynamicin the SAMBR seemed to be mainly influenced by biological activity, total suspended solids concentrationand substrate composition.