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O efluente do arroz parboilizado contém altas concentrações de fósforo. Um reator em batelada seqüencial (RBS) alimentado com efluente de reator UASB, operou com três fases anaeróbias e aeróbias e tempo de detenção de sólidos (TDS) de 25 d, 15 d, 10 d e 5d e tempo de reação (tR) de 1 d, 2 d e 3 d com e sem a adição de ácido acético (HAc). O reator operou com o efluente do equalizador em duas fases tratando com TDS de cinco dias. A eficiência foi calculada pela relação entre a massa de fósforo suspenso descartada e a massa total alimentada. O maior potencial de remoção de 46,14 mg ocorreu operando-se com uma fase anaeróbia e uma aeróbia com adição de HAc. O tR de um dia tem a maior possibilidade de aumento da eficiência pelo incremento do descarte de biomassa. A operação com TDS menores obtém as maiores eficiências de remoção. A capacidade de remoção é melhor utilizada com TDS de cinco dias. A maior eficiência (E=17,82%) foi obtida tratando o efluente do reator UASB com TDS de cinco dias, com duas fases, sem a adição HAc. The parboiled rice effluent has high phosphorus concentration. A sequential batch reactor (SBR) was fed with a UASB reactor effluent and operated with three anaerobic and aerobic phases and solids retention time (SRT) of 25 d, 15 d, 10 d and 5 d, and reaction time (tR) of 1 d, 2 d and 3 d, with and without acetic acid (HOAc) addition. The reactor operated with 5 d of SRT and two phases treating equalization tank effluent. The removal efficiency was calculated by the relation between phosphorus suspended wasted mass and feed mass. The biggest removal potential, 46.14 mg, was operated with HOAc addition and one anaerobic and aerobic phase. The biggest possibility of efficiency increase by biomass waste was obtained with tR=1 d. The system operating with smaller SRT achieves higher removal efficiencies. The removal capacity is better utilized with five days of SRT. The highest efficiency (E=17.82%) was obtained by treating the UASB reactor effluent with two phases, five days of SRT, without HOAc addition

Remoção de fósforo de efluentes da parboilização de arroz por absorção biológica estimulada em reator em batelada sequencial (RBS)