108 documents found, page 1 of 11
Experimental and Techno-Economic Study on the Use of Microalgae for Paper Indus...
Maria I. Silva; Ana L. Gonçalves; Vítor J. P. Vilar; José C. M. PiresHumanity is facing some major global threats, namely lack of environmental sustainability, the energy crisis associated with the unsustainable reliance on fossil fuels, and water scarcity, which will be exacerbated with the rapid growth of urban areas. Researchers have drawn their attention to microalgae, photosynthetic microorganisms known for their environmental applications, such as wastewater remediation an...
Inhibition effect of zinc, cadmium, and nickel ions in microalgal growth and nu...
Francisca M. Santos; Luciana P. Mazur; Diego A. Mayer; Vítor J. P. Vilar; José C. M. PiresThe effect of heavy metals (Cd, Ni, and Zn) on the growth of Chlorella vulgaris and nutrient uptake was assessed. C. vulgaris was cultivated in a synthetic solution with a single or ternary metal system. Biomass growth was well predicted considering a competitive inhibition model. The higher specific growth rate (0.34 d(-1)), biomass productivity (98.1 mg . L-1 . d(-1)), heavy metals uptake efficiency (85%) was...
An innovative multistage treatment system for sanitary landfill leachate depura...
Vítor J. P. Vilar; Tânia F. C. V. Silva; Petrick A. Soares; Diego R. Manenti; Amélia Fonseca; Isabel Saraiva; Rui A. R. BoaventuraIn this work, an innovative methodology for the treatment of landfill leachates, after aerobic lagooning, is proposed and adjusted at pilot-scale. This methodology involves an aerobic activated sludge biological pre-oxidation (ASBO), a coagulation/sedimentation step (240 mg Fe3+/L, at pH 4.2) and a photo-oxidation through a photo-Fenton (PF) reaction (60 mg Fe2+, at pH 2.8) combining solar and artificial light....
Use of wastewater to improve the economic feasibility of microalgae-based biofuels
Ana L. Gonçalves; Sérgio L. Pereira; Vítor J. P. Vilar; José C. M. PiresAlgae presents a viable biofuel alternative because the production of algae for fuel, unlike other agro-based biofuels, does not compete with food production. This book covers algae-based biofuel options and discusses the design and economic viability of algal bioenergy co-production concepts.
Photocatalytic reduction of Cr(VI) over TiO2-coated cellulose acetate monolithi...
Belisa A. Marinho; Raquel O. Cristóvão; Ridha Djellabi; José M. Loureiro; Rui A. R. Boaventura; Vítor J. P. VilarThe major drawback of TiO2 based advanced oxidation processes (AOPs) is the use of massive amounts of dispersed nanoparticles that are hard to recover after the water treatment and potentially harmful for humans due to their very small size. The stabilization of the nanoparticles in an adequate inert support is a good strategy to overcome such limitations. In the present work, the photoreduction of Cr(VI) to Cr...
Photo-Fenton oxidation of 3-amino-5-methylisoxazole: a by-product from biologic...
Bianca M. Souza; Belisa A. Marinho; Francisca C. Moreira; Márcia W. C. Dezotti; Rui A. R. Boaventura; Vítor J. P. VilarThe present study aims to assess the removal of 3-amino- 5-methylisoxazole (AMI), a recalcitrant by-product resulting from the biological breakdown of some pharmaceuticals, applying a solar photo-Fenton process assisted by ferrioxalate complexes (SPFF) (Fe3+/H2O2/oxalic acid/UVA-Vis) and classical solar photo-Fenton process (SPF) (Fe2+/ H2O2/UVA-Vis). The oxidation ability of SPFF was evaluated at different iro...
Intensification of heterogeneous TiO2 photocatalysis using an innovative micro-...
Vítor J. P. Vilar; Batuira M. da Costa Filho; Ana L. P. Araújo; Gabriela V. Silva; Rui A. R. Boaventura; Madalena M. Dias; José C. B. LopesThe main goal of this work is to overcome barriers in heterogeneous TiO2 photocatalysis application towards indoor air decontamination by process intensification. The photocatalytic oxidation (PCO) of gas-phase n-decane was studied using a micro-meso-structured-photoreactor irradiated by simulated solar light, consisting of chambers and channels mechanically engraved in an acrylic slab. The network of chambers ...
Cow bones char as a green sorbent for fluorides removal from aqueous solutions:...
Elbert M. Nigri; Maria Alice. P. Cechinel; Diego A. Mayer; Luciana P. Mazur; José M. Loureiro; Sônia D. F. Rocha; Vítor J. P. VilarCow bone char was investigated as sorbent for the defluoridation of aqueous solutions. The cow bone char was characterized in terms of its morphology, chemical composition, and functional groups present on the bone char surface using different analytical techniques: SEM, EDS, N-2-BET method, and FTIR. Batch equilibrium studies were performed for the bone chars prepared using different procedures. The highest so...
Ferrioxalate complexes as strategy to drive a photo-FENTON reaction at mild pH ...
Vítor J. P. Vilar; André A. Nogueira; Bianca M. Souza; Márcia W. C. Dezotti; Rui A. R. BoaventuraThe present study is about the use of ferrioxalate photoactive complexes as a strategy to drive a photo Fenton reaction at mild pH conditions, applied to the oxidation of antibiotic levofloxacin (LEV) in pure water and spiked in urban wastewater after secondary treatment. The oxidation ability of the solar photo Fenton mediated by ferrioxalate complexes (SPFF) was evaluated at different pH values (3.0 to 6.0) f...
Remediation of a synthetic textile wastewater from polyester-cotton dyeing comb...
Vítor J. P. Vilar; Petrick A. Soares; Renata Souza; Juan Soler; Rui A. R. Boaventura; Selene M. A. Guelli U. Souza; Tânia F. C. V. SilvaThis study reports an integrated treatment strategy for synthetic polyester-cotton dyeing wastewater, combining biological and photochemical oxidation processes. The biodegradability of all constituents, dyes and dyeing auxiliary products, present in the synthetic polyester dyeing textile wastewater were firstly analysed through a Zahn-Wellens test. More than 80% of the constituents are easily biodegradable, be...