RESUMO: Dentre as soluções existentes para efetuar o tratamento de esgoto, o reator anaeróbio do tipo UASB é largamente utilizado no Brasil, porém esta tecnologia apresenta problemas em atender aos limites estabelecidos pela legislação brasileira para lançamento de efluente em termos de nitrogênio amoniacal, fósforo e matéria orgânica, necessitando de pós-tratamento. Diante do potencial para remoção de matéria orgânica e sólidos suspensos pela flotação e da eficiência que a zeólita apresenta na remoção de amônia, a floto-filtração-adsortiva em zeólita pode ser uma promissora alternativa para tratamento deste efluente. Sendo assim, o presente trabalho visou avaliar a eficiência de um sistema de flotação associado à filtração-adsortiva, utilizando zeólita como meio filtrante, para pós-tratamento de efluente de reator UASB. Para tal, foram realizados ensaios de coagulação/floculação, flotação e filtração-adsortiva com um floteste adaptado com filtros adsorventes, utilizando efluente de reator anaeróbio do tipo UASB. Os resultados obtidos neste estudo atenderam aos padrões estabelecidos pela legislação brasileira para lançamento de efluentes em corpos d’água, alcançando 100 % de remoção de nitrogênio amoniacal, permitindo que esse efluente possa ser aproveitado para reuso. Desse modo, o sistema de flotação com a filtração-adsortiva utilizando zeólita como meio filtrante mostrou-se eficiente na remoção de todos os poluentes avaliados. Esta pesquisa teve como principal contribuição a avaliação de alternativa promissora para pós-tratamento de efluente de reator UASB buscando atender as exigências da legislação brasileira e melhorar da qualidade dos efluentes sanitários. ABSTRACT: Among the existing solutions to sewage treatment, the UASB reactor is widely used in Brazil, but this technology has problem to attend the limits established by Brazilian law for discharging of effluent, especially to ammonia nitrogen, phosphorus and organic matter, requiring post-treatment. The flotation has good performance in the removal of organic matter and solids presents in anaerobic effluent, as well as the zeolite in the removal of ammonia nitrogen, the flotation followed by filtration-adsorption in bed composed by zeolite may be a promising alternative for post-treatment of this effluent. Therefore, the objective of the present study was to investigate the efficiency of a dissolved air flotation system associated with filtration-adsorption using zeolite as filter media for post-treatment of UASB reactor effluent. Coagulation/flocculation tests were performed, flotation and filtration-adsorption with an adsorbent filters fitted with Floteste (Bench equipment for flotation) using anaerobic effluent from the UASB reactor. The results obtained in this study met the standards established by the Brazilian legislation for discharging of effluents into water bodies, reaching 100% of ammonia nitrogen removal, allowing this wastewater can be reused. Thus, the flotation-filtration-adsorption system using zeolite as filter media proved to be effective as post-treatment of anaerobic effluent. The main contribution of this study was the assessment of a promising alternative for post-treatment of UASB effluent to meet the criteria of Brazilian legislation and to improve the quality of sewage treatment.
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