UV radiation application for sewer disinfection of the UASB reactor association with aerated submerged biofilter (ASB) / Aplicação de radiação UV para desinfecção de efluente da associação de reator UASB e biofiltro aerado submerso

AUTOR(ES)

Silvia Sônia da Silva

DATA DE PUBLICAÇÃO

2007

RESUMO

This research has investigated and interpreted relevant aspects of disinfection by ultraviolet radiation (UVR) in the inativation of indicator microorganismsinactivation. The sanitary effluent was provided by anaerobic treatment (UASB reactor), followed by aerated submerged biofilter (ASB), on a real scale. This research was divided into two stages, whereas in the first stage, operational characteristics of the ultraviolet unit studies were highlighted. The aim of the second stage of the research was the resistance of different indicator microorganisms to ultraviolet radiation study and the possible relation among variables tested. Results obtained in the first stage of the research have provided indication that the cleaning of submerged lamps may be done in periods longer than two months, however the fragility of the system must be considered. Disinfection channel cleaning should not be related to the disinfection efficiency. The operation of UV units is relatively simple, as long as the operators are trained and work under favorable ergonomic conditions. The operational cost was set at 0.006 R$/M POT.3of disinfected sewer system and the electrical energy cost was set at 0.07 R$/M POT.3. The maximum efficiency found on the disinfection of the research second stage were 100% for Coliphages, 99.999% for FC and 99.993% for TC, which demonstrates that the resistance decreasing order of these organisms is TC >FC >Coliphages. Results indicated that there was a low inactivation efficiency variation for the three tested sewer samples (3 cm, 4 cm and 5 cm), which suggests that the unit is capable of serving moderate increase of flow, confirming adopted predictions in its dimensioning. Information obtained from the hydrodynamic test indicated that the tested disinfection reactor behaves as a compound system of an ideal piston reactor with hydraulic short circuits.

ASSUNTO(S)

desinfecção por uv inativação de microrganismos indicadores indicator microorganism s inactivation custos de desinfecção disinfection costs uvr disinfection

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