Retenção do alquilbenzeno linear sulfonado e fármacos por sistemas de membranas

Abstract

The treatment of industrial wastewater is one of the instruments of the environmental management, this practice, in addition to complying with current legislation, is also responsible for mitigating environmental impacts. On the complexity of the composition of the effluents, detergents and drugs are the emerging pollutants that stand out most due to their widespread use, and their inadequate treatment can compromise water quality, through changes in the physicochemical parameters of the water. Of this problem, the membrane filtration system as a method of treatment of effluents stands out, because it offers techniques of reuse of the effluent and reduction of the formation of residues. Thus, the objective of this study was to evaluate the retention of alkylbenzene linear sulfonated, caffeine and diclofenac sodium by ultrafiltration submerged membrane systems. The reactor was built on a pilot scale with cut-off 10kDa membranes, asymmetric and PVDF material, investigating the influence of pressure and initial concentration on the efficiency of the membranes operation, based on COD and quantification of these contaminants. For this purpose, the work was developed by filtration tests and COD of each contaminant in distilled water solution, followed by synthetic effluent with quantification of the compounds by liquid chromatography. The efficiency of removal of 60% COD for LAS, 80% for diclofenac and 20% for caffeine in distilled water tests was obtained; while in the filtration of the synthetic effluent it was 60% 22% and 4% concentration. Thus, it could be seen that the micellar critical concentration may promote the filtration efficiency by membranes even at lower concentrations for the formation of the surfactant monomer agglomerates, whereas the drugs obtained lower efficiency due to the molecular size of the compounds.