Avaliação da aplicabilidade da filtração terciária para condicionamento de efluente secundário a desinfecção por radiação ultravioleta

• Autor(a) principal: Araujo, Bruna Magalhães de
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/10873
• topic: Environmental engineering; Water - Purification - Filtration; Water quality; Ultraviolet radiation; Reuse of effluents; Tertiary filter; Sand filter; Sand and activated charcoal filter; Engenharia ambiental; Água - Purificação - Filtração; Qualidade da água; Radiação ultravioleta; Reuso de efluentes; Filtro Terciário; Filtro de areia; Filtro de areia e carvão ativado; CNPQ::ENGENHARIAS

Due to the severe droughts and the need to protect the water sources, it is essential to promote the discussion on the reuse of effluents, in order to foster the consolidation of the practice in the national territory. To do so, it is necessary to search for treatment technologies, to produce regenerated water that are appropriate and interesting local characteristics. The Tertiary Filters, due to their simplicity of operation and reduced economic cost, when compared to more sophisticated techniques, can represent an interesting tool of pre-treatment the disinfection. In this context, the present research carried out an evaluation of the applicability of tertiary filtration for the conditioning of effluent secondary to disinfection by Ultraviolet radiation. For this purpose, the effluent from the Sapucaia do Rio ETE, treated at a secondary level, was utilized through the UASB Reactor, followed by the Submerged Aerated Filter. In a first phase, the effluent was then subjected to a single layer filter (FS) and a double layer filter (FD), separately. Subsequently, in order to complement the study in question, effluent from the filtration was disinfected through the Ultraviolet Reactor in a second phase. For qualitative evaluation of the generated reuse water, tests were carried out on Thermotolerant Coliforms, Turbidity, TOC, Temperature and pH. Thus, with respect to the results found from the temperature and pH, the Tertiary Filters presented expected values and without large variations. However, on COD, this type of technology did not perform well. Regarding effluent clarification, single and double layer filters have an average efficiency of 79% and 88%, respectively. The Simple Filter presented an effluent with 5 NTU in average and reached a maximum efficiency of 95%. For the dual filter, on average, effluents present 10 NTU turbidity and a maximum efficiency of 99%. Regarding the parameter Coliformes Termotolerantes, the units removed on average only 1 logarithmic unit. Although such a reduction is not enough for the effluent to be used for reuse, it is pointed out that the effluent flow through the tertiary filtration reduced the affluent load of this parameter to the disinfection unit. Thus, from the results found in the present work, it can be concluded that in general both FS and FD presented interesting and satisfactory results to be used in the pre-disinfection, both in relation to the turbidity parameter and in relation to the parameter Thermotolerant Coliform. In the second phase of the experiment, the maximum reduction was obtained around 2 and 3 decimal places respectively for FS followed by UV and FD reactor followed by reactor. It is emphasized that the continuation of the second phase of the second phase in future work would be indicated in order to obtain more conclusive results.