Caracterização de membrana de fibra oca de poli(fluoreto de vinilideno) e sua aplicação como módulo de ultrafiltração no tratamento de água com matéria orgânica

Abstract

In this work, poly(vinylidene fluoride) (PVDF) hollow fiber ultrafiltration membranes produced by startup Vitaltec Engenharia were characterized, evaluating their performance in the treatment of water with organic matter. The characterization of ultrafiltration membranes was performed through hydraulic permeability test and rejection of solutes, such as bovine serum albumin (BSA) and polyvinylpyrrolidone (PVP) K30 and K90. The membrane showed high hydraulic permeability and rejection to higher molar mass solutes. The fiber was also characterized by scanning electron microscopy (SEM), thermogravimetry (TGA), differential scanning calorimetry (DSC), and porosity by mercury intrusion. A module was made with the membrane and used in a pilot system to study the application in the treatment of water with organic matter. The study was conducted following a long-term operation, with the flow decline (L/h.m2) and turbidity (NTU) being monitored every hour. Physico-chemical and microbiological analyzes of feed and permeate flows were carried out in order to assess the efficiency of water purification. The case study demonstrated the module's efficiency in removing turbidity, bacteria and soluble solids from the feed. Chemical and biological oxygen demand analyzes were considered relatively inconclusive due to very low rates in the feed. The results of the study suggest that the membrane is suitable to be used in conjunction with another process in the treatment of superficial water of class 2 and 3.