Adição de ferro nas águas residuárias de cervejaria visando aumento da produção de metano e a estabilidade de reatores uasb em dois estágios
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Data
2020-02-11
Autores
Quintanilha, Amanda Sá
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Universidade Estadual Paulista (Unesp)
Resumo
O desempenho de um sistema UASB de dois estágios no tratamento de águas residuárias de cervejaria com a suplementação de Fe foi avaliado, buscando melhorar a remoção de material orgânico, produção e a qualidade do biogás. Os reatores foram operados durante 525 dias, com tempo de detenção hidráulica (TDH) de 23,5 h e 13,2 h no R1 e 15,5 h e 8,7 h no R2. No período de 343 a 525 dias, realizou-se a suplementação com diferentes dosagens de Fe. O sistema mostrou estabilidade operacional, e os maiores valores de produção volumétrica de metano foram de 2,05 L CH4 (L d )-1 no R1 e 1,49 L CH4 (L d )-1 no R2 com as maiores COV de 30,2 g DQO total (L d)-1 no R1 e 13,8 g DQO total (L d)-1 no R2. A produção específica de metano foi crescente no R1 de 0,09 a 0,31 L CH4 (g DQOtotal removida)-1, e no R2, de 0,10 a 0,21 L CH4 (g DQOtotal removida)-1. As maiores eficiências de remoção de DQO total, DQO dissolvida foram de 83,5 %. O melhor desempenho dos reatores UASB em dois estágios foi associado com uma proporção adequada de Fe, que favoreceu o tratamento anaeróbio de águas residuárias de cervejaria com elevada COV e produção de metano em condições estáveis.
The performance of a two-stage UASB system in the treatment of brewery wastewater with Fe supplementation was evaluated, seeking greater removal of organic material, production and biogas quality. The reactors were operated for 525 days, with hydraulic detention time (HDT) of 23.5 h and 13.2 h in R1 and 15.5 h and 8.7 h in R2. From 343 to 525 days, Fe supplementation was performed and different dosages were tested. The system showed operational stability, the highest methane volumetric production values were 2.05 L CH4 (L d)-1 in R1 and 1.49 L CH4 (L d)-1 in R2 with the highest OLR of 30, 2 g total COD (L d)-1 at R1 and 13.8 g total COD (L d) -1 . Specific methane production was increased at R1 from 0.09 to 0.31 L CH4 (g CODtotal removed) -1 and at R2 from 0.10 to 0.21 L CH4 (g CODtotal removed) -1 . The highest removal efficiencies of total COD and dissolved COD were 83.5%. The better performance of two-stage UASB reactors was associated with an adequate proportion of Fe, which favored anaerobic treatment of high OLR brewery wastewater and methane production under stable conditions.
The performance of a two-stage UASB system in the treatment of brewery wastewater with Fe supplementation was evaluated, seeking greater removal of organic material, production and biogas quality. The reactors were operated for 525 days, with hydraulic detention time (HDT) of 23.5 h and 13.2 h in R1 and 15.5 h and 8.7 h in R2. From 343 to 525 days, Fe supplementation was performed and different dosages were tested. The system showed operational stability, the highest methane volumetric production values were 2.05 L CH4 (L d)-1 in R1 and 1.49 L CH4 (L d)-1 in R2 with the highest OLR of 30, 2 g total COD (L d)-1 at R1 and 13.8 g total COD (L d) -1 . Specific methane production was increased at R1 from 0.09 to 0.31 L CH4 (g CODtotal removed) -1 and at R2 from 0.10 to 0.21 L CH4 (g CODtotal removed) -1 . The highest removal efficiencies of total COD and dissolved COD were 83.5%. The better performance of two-stage UASB reactors was associated with an adequate proportion of Fe, which favored anaerobic treatment of high OLR brewery wastewater and methane production under stable conditions.
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Digestão de águas residuais, Resíduos industriais, Sewage, Microbiology, Reatores UASB, Metano, Digestão anaeróbia, Biogás, Cervejarias, Suplementação de nutrientes, Microbiologia, Carga orgânica volumétrica