Avaliação de um sistema híbrido composto por um hidrociclone e membranas cerâmicas/polimérica para tratamento de águas residuárias.

Abstract

Agribusiness is responsible for high water consumption and high losses. With the scarcity of water resources, minimizing water consumption in this sector is of paramount importance.Therefore, this project aimed to analyze a hybrid system composed of Bradley family hydrocyclone, parallel microfiltration ceramic membrane system and reverse osmosis membrane. The hybrid system was used to treat wastewater for reuse in irrigation. To this end, the hydrocyclone was first constructed, followed by the physical characterization of the effluents used in the hybrid system (lagoon and septic tank) located in the UFCG, in which experimental data on volumetric concentration and mean particle size distribution were obtained. The hydrocyclone was evaluated by changing both the process variables (feed rate and operating time) and the physical properties of the effluent to verify the solid / liquid separation efficiency. The prepared ceramic membranes presented pore size of 1.33 μm and apparent porosity of 53%, working at the best characterization pressure of 3.0 kgf.cm-2, with recovery of approximately 50% for the smallest wastewater. volumetric concentration. The maximum total efficiency (η) achieved by the hydrocyclone was approximately 40%. In the hybrid system total nitrogen removal was up to: 87%, 77% for COD, 95% for BOD5,20, 99% for turbidity, 89% for color, 80% for total dissolved solids and complete bacterial removal. thermotolerant. Given the results obtained, the waters were classified by class according to the CONAMA Regulation no 357 of 2005 for reuse, varying their reuse between recreational activities, irrigation of vegetables and fruit plants, animal desedentation, among others. The hybrid system has considerable wastewater treatment capacity with wide application possibilities.