Título: Chemical Engineering JournalImportada do Authenticus Pesquisar Publicações da Revista

Vol. 268

Páginas: 92-101

ISSN: 1385-8947

Editora: Elsevier

ISI Web of Knowledge - 12 Citações

ISI Web of Science

Scopus - 19 Citações

INSPEC

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

ID Authenticus: P-00A-BJB

DOI: 10.1016/j.cej.2015.01.025

Abstract (EN): The feasibility of a novel sorption treatment using regranulated cork granules for oil and grease (O&G) removal from real vegetable oil refinery wastewaters (VORW) was investigated and compared to similar treatment of oil-in-water emulsions. O&G sorption from real VORW onto regranulated cork particles was studied at different pH and ionic strength conditions. Only wastewater acidification was able to effectively destabilize the O&G emulsion in the wastewater, enhancing the sorption process (efficiency over 80% at pH 2.0). A 3-factor, 3-level (3(3)) Box-Behnken experimental design was used to examine the effect of pH, ionic strength and soap/oil ratio on O&G removal efficiency in oil-in-water emulsions. All effects were significant (p < 0.05) when considered individually, but no significant interactions were observed. pH was found to have the strongest effect, supporting the initial observations in real VORW. The treatment of a simulated wastewater (60% soap/oil ratio, 0.2 M NaCl and pH 2.0) was completed in batch and continuous mode. Freundlich and linear partitioning models were used to describe 082G sorption equilibria. Continuous treatment was successfully carried out in a stirred-tank reactor using a cork dosage of 3.4 g L-1, a stirring speed of 250 rpm and a flowrate of 10 mL min(-1). The reactor was fed for 8 h with simulated wastewater (205 +/- 30 mg L-1 O&G) yielding an effluent with an O&G content below 15 mg L-1 (discharge limit defined in Portuguese legislation), A mass transfer model was applied to describe the O&G sorption kinetics in batch and continuous stirred-tank reactors.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10