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Chemical oxidation of fish canning wastewater by Fenton's reagent
Cristovão, Raquel; Botelho, Cidália; Martins, Ramiro; Boaventura, RuiThe fish canning industry generates large volumes of wastewater for which the treatment is particularly difficult due to the high content of organic matter and salts and to the significant amount of oil and grease they present. In this work, a closed jacketed batch reactor was used to study the feasibility of applying a Fenton reaction step after an activated sludge biological treatment. For this purpose and in...
Primary treatment optimization of a fish canning wastewater from a Portuguese p...
Cristovão, Raquel; Botelho, Cidália; Martins, Ramiro; Loureiro, José; Boaventura, RuiA sequence with three stages was optimized as a primary treatment for wastewaters from a fish canning industry of northern Portugal. Sedimentation tests were assessed at different times. The removal of a high fraction (75%) of oil and grease (O&G) and of some (48%) total suspended solids (TSS) occurred after a settling time of 1.5h. Coagulant dosage and pH value were optimized in the coagulation/flocculation tr...
Chemical oxidation of fish canning wastewater by fenton’s reagent
Cristovão, Raquel; Gonçalves, Cristiana; Botelho, Cidália; Martins, Ramiro; Boaventura, RuiThe fish canning industry generates large volume of wastewater for which the treatment is particularly difficult due to the high content of organic matter and salts and to the significant amount of oil and grease they present. In this work, a closed jacketed batch reactor was used to study the feasibility of applying a Fenton reaction step after an activated sludge biological treatment. For this purpose and in ...
Especiação de iões metálicos em três estações do Rio Este em diferentes épocas ...
Botelho, Cidália Maria SousaDissertação apresentada para obtenção do grau de Doutor, na Faculdade de Engenharia da Universidade do Porto, sob a orientação da Prof. Doutora Maria de Lurdes Sadler Simões Gonçalves e Prof. Doutor Rui Boaventura
Chemical and biological treatment of fish canning wastewaters
Cristovão, Raquel; Botelho, Cidália; Martins, Ramiro; Boaventura, Ruihe main environmental problems of fish canning industries are high water consumption and high organic matter, oil and grease and salt content in their wastewaters. This work aims to analyze the situation (water consumption, wastewater production, wastewater characterization, etc.) of different plants located north of Douro river, in Portugal, in order to propose various solutions to their problems. Thus, initia...
Pollution prevention and wastewater treatment in fish canning industries of Nor...
Cristovão, Raquel; Botelho, Cidália; Martins, Ramiro; Boaventura, RuiThe main environmental problems of fish canning industries are high water consumption and high organic matter, oil and grease and salt content in their wastewaters. This work aims to analyze the situation (water consumption, wastewater production, wastewater characterization, etc.) of different plants located north of Douro river, in Portugal, in order to propose various solutions to their problems. Thus, initi...
Cr(III) uptake by marine algal biomass: equilibrium and kinetics
Vilar, Vitor; Freitas, Olga; Costa, Pedro; Botelho, Cidália; Martins, Ramiro; Boaventura, RuiIn this work, biosorption of trivalent chromium by the marine brown algae Sargassum muticum was 37 studied in a batch system. The effect of the solution pH on Cr(III) uptake by Sargassum was 38 investigated. Kinetics and equilibrium experiments were conducted at different pH values (3.0, 4.0 and 39 5.0). Equilibrium data are well described by the Langmuir and Langmuir-Freundlich isotherms and 40 kinetics follow...
Removal of Cu and Cr from an industrial effluent using a packed-bed column with...
Vilar, Vitor; Martins, Ramiro; Botelho, Cidália; Boaventura, RuiThe purpose of this work was to evaluate the potential of algal waste from the agar extraction industry, immobilized in a polymer, and the algae Gelidium itself, the raw material of agar extraction, to remove Cu(II) and Cr(III) from industrial effluents. The study involved a Cu(II) bearing effluent and the mixture of this effluent with an effluent containing Cr(VI), previously reduced to Cr(III). The two efflue...
Continuous biosorption of single and binary metal solutions in a fixed-bed colu...
Vilar, Vitor; Botelho, Cidália; Martins, Ramiro; Boaventura, RuiThis paper describes the biosorption of single (Zn(II) and Cr(III)) and binary (Cd(II)/Zn(II) and Cu(II)/Cr(III)) metal solutions in a packed bed column using algae Gelidium and an algal waste from the agar extraction industry immobilized with polyacrylonitrile. In the sorption process, Zn(II) breaks through the column faster than Cd(II) due to its lower affinity for the biosorbent. An overshoot in the outlet Z...
Cadmium uptake by algal biomass in batch and continuous (CSTR and packed bed co...
Vilar, Vitor; Santos, Sílvia; Martins, Ramiro; Botelho, Cidália; Boaventura, RuiIn this work, the properties of marine algae Gelidium, algal waste from agar extraction industry and a composite material were investigated for cadmium(II) biosorption. Equilibrium experiments were performed at three pH values (4, 5.3 and 6.5). Equilibrium data were well described by the Langmuir and Langmuir–Freundlich isotherms. Two models predicting the pH influence in the cadmium biosorption (discrete and c...
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