Avaliação da microfiltração tangencial como alternativa de tratamento avançado de efluente gerado em sistema de tratamento de esgoto sanitário constituído de reator UASB (Upflow Anaerobic Sludge Blanket) seguido de tanque de aeração / The evaluation of crossflow microfiltration as an alternative for advanced treatment of effluent generated in a system of sewage treatment composed by a UASB (Upflow Anaerobic Sludge Blanket) reactor followed by an aeration tank

AUTOR(ES)

Carlos Magno de Sousa Vidal

DATA DE PUBLICAÇÃO

2006

RESUMO

The proposal of this research was to evaluate the crossflow microfiltration as an alternative for an advanced treatment of effluent generated in a system of sewage treatment composed by a UASB (Upflow Anaerobic Sludge Blanket) reactor followed by an aeration tank. This work aimed to evaluate the membranes physical cleaning methods (backwashing with compressed air) and the chemical ones (acid and basic), as well as the comparative analysis between the fouling event and the 0,2 and 1,0 mü m pore size membranes performance, when applied to the aeration tank effluents in a post-treatment stage at TSS different concentrations. Studies for microfiltration effluents disinfection by UV radiation and the application of the coagulation process preceding the crossflow microfiltration were also developed. The experiments were performed in a pilot unit with polypropylene tubular membranes with 0.036 M POT.2 of effective filtration area. It was verified that the physical cleaning was essential to the attainment of higher permeate flux values in the microfiltration unit. The chemical cleaning of the membranes through basic solution was more efficient when compared to their acid cleaning. Better results were attained when the 0,2 mü m membrane was employed in comparison with the 1 mü m membrane, which presented intense internal blocking of its pores. It was attained an excellent microbiological quality (E.Coli <1 FCU/100 mL and Coliphages <16 FPU/100 mL) for the 0,2 mü m membrane, as well as turbidity levels under 1,46 uT and almost total removal of TSS. The previous mixed liquor samples coagulation of the aeration tank contributed to the attainment of higher rates and better removal of P- PO IND.4 POT.3- and CODt in the microfiltration unit. It was attained, for the ferric chloride 40 mg/L dosage, the higher mean rate (139,7 L/ M POT.2 .h), P- PO IND.4 POT.3- remaining concentrations under 1,4 mgP/L and CODt lesser than 33 mg/L. The UV radiation allowed the complete inactivation of E.Coli and Coliphages from the permeate samples. It was concluded that the crossflow microfiltration presents great possibilities of application in the advanced treatment of effluent generated in a system of sewage treatment composed by a UASB (Upflow Anaerobic Sludge Blanket) reactor followed by an aeration tank.

ASSUNTO(S)

fouling colmatação tratamento avançado membrane biological reactors microfiltração tangencial reatores biológicos de membrana crossflow microfiltration advanced sewage treatment

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