Aplicação de biorreator de membrana dinâmica submersa no tratamento de águas residuárias domésticas

Abstract

The present study had as objective the treatment of domestic wastewater using anaerobic submerged dynamic membrane bioreactor for agricultural use, being evaluated the capacity of removal of organic matter and removal of pathogens. The bioreactor was built at the Experimental Station for Biological Treatments of Sanitary Sewage (EXTRABES) in Campina Grande, Paraíba, which the supporting material used was a 89 µm polyethylene mesh, the system operated under an 8-hour HRT, with a constant flow of 3.39 Lm-².d-¹ and ambient temperature. The system operated for 120 days and TMP reached 122.78 kPa, showing good performance and promising results in the removal of COD and turbidity, which were 77.3% and 83.2%, respectively. There was also a removal of 99.5% of helminth eggs, with 0.3 eggs.L-1 being found in the permeate, in addition to the removal of total coliforms and E. coli, enabling the agricultural use of treated wastewater in crop irrigation of hardwoods and cultivated plants far from the ground level, since what is recommended by the guideline is that the value of E. Coli is ≤ 10^5 and 10^6 mg.L^-1 , respectively. It was observed that the submerged AnDMBR is not able to remove nutrients such as phosphorus, which is an advantage given the purpose of the study. According to the results obtained, the submerged AnDMBR technology is a more compact and economically viable way of treatment, when compared to technologies already widespread such as UASB. In addition, the construction of the bioreactor using cheaper materials does not compromise its performance, making the alternative even more attractive from an economic point of view.