7 documents found, page 1 of 1
Performance evaluation of the main units of a refinery wastewater treatment pla...
Carlos E. Santo; André Fonseca; Eva Kumar; Amit Bhatnagar; Vítor J. P. Vilar; Cidália M. S. Botelho; Rui A. R. BoaventuraPetroleum refineries generate great amounts of wastewaters which require proper treatment before being discharged into coastal waters or other aquatic systems. The main pollutants present in these industrial wastewaters include suspended particles, biodegradable and refractory organics, hydrocarbons, sulfides, phenols and nitrogen compounds. The performance of the Porto Refinery wastewater treatment plant (WWTP...
Biological treatment by activated sludge of petroleum refinery wastewaters
Carlos E. Santo; Vítor J. P. Vilar; Amit Bhatnagar; Eva Kumar; Cidália M. S. Botelho; Rui A. R. BoaventuraThis paper reports on biological treatment by activated sludge of petroleum refinery wastewaters, in a lab-scale reactor constituted by an aeration tank and clarifier provided with sludge recycle system. The main objective of the work includes the optimization of the process efficiency in terms of chemical oxygen demand (COD), total organic carbon (TOC), and total suspended solids (TSS), and modeling of the bio...
Insights into trivalent chromium biosorption onto protonated brown algae Pelvet...
Vítor J. P. Vilar; José A.B. Valle; Amit Bhatnagar; João C. Santos; Selene M. A. Guelli U. de Souza; Antônio Augusto U. de Souza; Cidália M. S. BotelhoIn the present study, biosorption of trivalent chromium by protonated brown algae, Pelvetia canaliculata, was studied in batch system. FTIR analyses provided information about the possible binding groups present in the algae, as carboxylic, hydroxyl and sulfonate groups. Potentiometric acid-base titrations showed a heterogeneous distribution of two major binding groups, carboxyl and hydroxyl ones, following the...
Optimization of nickel biosorption by chemically modified brown macroalgae (Pel...
Amit Bhatnagar; Vítor J. P. Vilar; Catarina Ferreira; Cidália M. S. Botelho; Rui A. R. BoaventuraIn the present work, various forms of algae Pelvetia canaliculata were prepared by different chemical modifications, in order to get the best form of algae for the maximum uptake of nickel. Potentiometric titration revealed that the carboxyl groups were more abundant (3.9 mmol/g) as compared to hydroxyl groups (2.0 mmol/g) on the biosorbent surface. Fourier transform infrared (FUR) analysis of algae was done to...
Valorisation of marine Pelvetia canaliculata Ochrophyta for separation and reco...
Amit Bhatnagar; Vítor J. P. Vilar; João C. Santos; Cidália M. S. Botelho; Rui A. R. BoaventuraIn the present study, biosorption of Ni2+ by Na-loaded (raw algae treated with NaCl), algae Pelvetia canaliculata Ochrophyta, was studied in a batch system. Kinetics and equilibrium experiments were conducted at different pH values (2.0, 3.0 and 4.0). The metal uptake capacity decreased by decreasing the solution pH, suggesting that competition exists between hydrogen ions, present in high concentrations at low...
Valorisation of marine Pelvetia canaliculata for separation and recovery of nic...
Amit Bhatnagar; Vítor J. P. Vilar; João C. Santos; Cidália M. S. Botelho; Rui A. R. BoaventuraIn the present study, biosorption of Ni2+ by Na-loaded (raw algae treated with NaCl), algae Pelvetia canaliculata Ochrophyta, was studied in a batch system. Kinetics and equilibrium experiments were conducted at different pH values (2.0, 3.0 and 4.0). The metal uptake capacity decreased by decreasing the solution pH, suggesting that competition exists between hydrogen ions, present in high concentrations at low...
Optimization of coagulation-flocculation and flotation parameters for the treat...
Carlos E. Santo; Vítor J.P. Vilar; Cidália M. S. Botelho; Amit Bhatnagar; Eva Kumar; Rui A. R. BoaventuraPetroleum refineries generate significant amounts of wastewater which have to be treated and processed before their discharge into water streams. The refinery wastewater treatment plants (WWTPPs) employ physico-chemical processes to achieve effluents of satisfactory oil content to be further treated by biological processes. In the present study, coagulation-flocculation and flotation processes are optimised to ...