ABSTRACT: Bioenergy research aims to uncover the potentials of biological residues. Regional-specific characterization of such potentials is needed to improve the use of local resources, decisions on bioenergy conversion routes, and services within global efforts against climate change. The definition and calculation of the theoretical and technical biomass and bioenergy potentials are keys for developing susta...
ABSTRACT: The ability of microalgae to grow in nutrient-rich environments and to accumulate nutrients from wastewaters (WW) makes them attractive for the sustainable and low-cost treatment of WW. The valuable biomass produced can be further used for the generation of bioenergy, animal feed, fertilizers, and biopolymers, among others. In this study, Scenedesmus obliquus was able to remove nutrients from differen...
The value of on-line UV/vis spectroscopy for wastewater quality monitoring in two different sewage management situations was confirmed. For decentralised wastewater treatment, spectral on-line monitoring of key quality parameters (COD, organic N) at the WWTP inlet was found to be possible, at two plants of different sizes and inflow characteristics. The produced data allowed the dynamic modelling of the treatme...
Chlorella protothecoides, a lipid-producing microalga, was grown heterotrophically and autotrophicallyin separate reactors, the off-gases exiting the former being used to aerate the latter. Autotrophic biomass productivity with the two-reactor association, 0.0249 g L-1h-1, was 2.2-fold thevalue obtained in a control autotrophic culture, aerated with ambient air. Fatty acid productivity was1.7-fold the control v...
Chlorella protothecoides, a lipid-producing microalga, was grown heterotrophically and autotrophicallyin separate reactors, the off-gases exiting the former being used to aerate the latter. Autotrophic biomass productivity with the two-reactor association, 0.0249 g L-1h-1, was 2.2-fold thevalue obtained in a control autotrophic culture, aerated with ambient air. Fatty acid productivity was1.7-fold the control v...
A utilização de sistemas de monitorização contínua em estações de tratamento de águas residuais (ETAR) descentralizadas de pequena dimensão é uma via promissora para aumentar o conhecimento sobre as condições de funcionamento e, também, para servir como alerta precoce sobre situações anómalas. Sem o acesso a este tipo de informação é difícil garantir um bom desempenho dos processos de tratamento. Desenvolviment...
A subida do nível do mar e o aumento dos extremos hidrológicos, previstos para Portugal devido às alterações climáticas, terão implicações importantes no desempenho dos sistemas de drenagem urbana existentes bem como na conceção de novos sistemas. A combinação destes efeitos irá afetar particularmente os sistemas de drenagem localizados em zonas costeiras ou estuarinas, com o aumento de riscos de inundação de e...
In comparison to larger plants, decentralized small size wastewater treatment plants (DCWWTP) face more pronounced operational constraints such as high load fluctuations, operation and maintenance problems and increased costs per capita. The scarcity of historical data on the performance of this type of plants is generally associated to largely unattended operation. Thus, it is important to gain adequate inform...
A dispersão de aglomerados de pequena dimensão, particularmente nas zonas rurais, aponta para a necessidade de adoptar sistemas descentralizados de tratamento de águas residuais. No que se refere a soluções de tratamento, a escassez de dados sobre o funcionamento das instalações de pequena dimensão existentes tem constituído uma barreira à sua optimização. A utilização de tecnologias de monitorização em linha p...
Cu'2+ removal from aqueous solutions (O.1mM) was compared using viable cells of two yeast strains, grown both in the presence and in the absence of the metal. The flocculent yeast strain (S. cerevisiae NRRL Y265) presented significantly higher removal yields in both cases (respectively, 62 and 99% versus 7 and 12% for the non-flocculent strain of S. carlsbergensis). The effect of the ion metal concentration on ...