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Kinetic modelling of cadmium and lead removal by aquatic mosses
Martins, Ramiro; Vilar, Vitor; Boaventura, RuiBecause biosorption is a low cost and effective method for treating metal-bearing wastewaters, understanding the process kinetics is relevant for design purposes. In the present study, the performance of the aquatic moss Fontinalis antipyretica for removing cadmium and lead from simulated wastewaters has been evaluated. Five kinetic models (first-order, pseudo-first-order, Elovich, modified Ritchie second-order...
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 ...
Acumulação e libertação de metais pesados por briófitas aquáticas
Martins, Ramiro José EspinheiraDissertação apresentada para obtenção do grau de Doutor em Engenharia Química, na Faculdade de Engenharia da Universidade do Porto, sob a orientação do Doutor Rui Alfredo da Rocha Boaventura
New materials, surface coatings and biodegradable oils for industrial gears
Martins, Ramiro CarneiroTese de doutoramento. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 2008
Accumulation and release of Pb(II) in aqueous solution by aquatic mosses (Fonti...
Martins, Ramiro; Freitas, Olga; Vilar, Vitor; Boaventura, RuiThe uptake and release of Pb(II) by Fontinalis antipyretica was studied in laboratory, by exposing the plants to different lead concentrations for 144 h and 335 h contamination and decontamination periods, respectively. A first order kinetic model was fitted to the experimental data to determine the uptake and release constants, k1 and k2, and other relevant parameters. The metal accumulation capacity, at equil...
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...
Application of aquatic mosses to decontaminate industrial effluents
Martins, Ramiro; Boaventura, RuiAs biosorption is a low cost and effective method for treating metal-bearing wastewaters, understanding the process kinetics is relevant for design purposes. In the present study, the performance of the aquatic moss Fontinalis antipyretica for removing cadmium and lead from simulated wastewaters has been evaluated. Five kinetic models (first-order, pseudo-first-order, Elovich, Ritchie second-order and pseudo- s...
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