UV STERILIZER IN SEWAGE TREATMENT FOR THE AGRICULTURAL REUSE

Abstract

The normal release of sanitary sewage, in addition to allowing the transmission of diseases, generates water courses compromising its multiple uses as a source of supply, irrigation, reuse and recreation. The treatment of domestic sewage becomes an alternative of water and nutrients in agricultural cultivation, and must meet the criteria defined by legislation. Thus, this work aimed to evaluate the pathogenic load of the treated effluent, coming from a TEE, before and after the application of ultraviolet disinfection, demanding agricultural reuse. Weekly samplings were performed before and after ultraviolet disinfection (A / UV and D / UV) to characterize pH, turbidity, electrical conductivity (CE), dissolved oxygen (OD), total organic carbon (COT), total coliforms (CT) and thermotolerant (CThermo), as well as total nitrogen (NT). Between the raw effluent and the other sampled points A/UV and D/UV, important differences: pH, CE, OD, turbidity and NT. For COT there was no difference between the A/UV and D/UV points. CT and CThermo differed among all sampled points. It is concluded that the ultraviolet sterilizer presents efficiency in the elimination of bacteria despite the fact that the final microbiological load does not fit the current legislation, which makes the agricultural reuse of the treated effluent impossible.