Processo de desinfecção por radiação ultravioleta em efluente de filtro biológico percolador

Abstract

In Brazil, the lack of a sewage system is the main cause of pollution of water resources, especially in the most populated areas, besides being responsible for several diseases that affect the population. In this context, ultraviolet radiation disinfection has become a well accepted option for disinfection of water and wastewater. In view of this, the present work had the objective of performing an advanced treatment of disinfection by UV radiation in biological filter effluent percolator (FBP). The systems were built in laboratory scale, working in a batch regime, a UV lamp was adapted inside the systems, where it was manually operated, in system I the lamp received a coating of borosilicate glass (adaptation of a test tube) and system II the effluent fou received the direct radiation. It was observed that the system I was easy to operate and clean, however, in relation to its main purpose was the disinfection of effluent, it was inefficient, because the results obtained did not meet the objective of reducing the microbial load and total and thermotolerant coliforms. The results found in system II showed to be in agreement with the standards established by Resolution nº 357/2005 of CONAMA for the total coliform parameters, thermotolerant coliforms and Escherichia coli. In view of the results obtained by the microbiological analyzes, it was verified that the coating that the UV lamp received in system I negatively influenced the disinfection process.