Tratamento de águas residuárias de suinocultura em reatores anaeróbios horizontais seguidos de reator aeróbio em batelada sequencial
Carregando...
Data
2011-01-01
Autores
Santos, Ariane C. dos [UNESP]
Oliveira, Roberto A. de [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Engenharia Agrícola (SBEA)
Resumo
Avaliou-se o desempenho de um sistema combinado anaeróbio-aeróbio para o tratamento de águas residuárias de suinocultura, com concentrações médias de sólidos suspensos totais (SST) de 18.624 e 11.395 mg L-1. Foram utilizados quatro reatores anaeróbios horizontais com volume total de 49,5 L cada, um com manta de lodo (RAHML) e três de leito fixo (RAHLF), instalados em série e seguidos de um reator aeróbio operado em batelada sequencial (RBS) com volume total de 339 L e com alimentação contínua. Nos RAHLF, foram utilizados como meios suporte de anéis de bambu, anéis plásticos de eletroduto corrugado e anéis de bucha (Luffa cillyndrica), respectivamente. Os tempos de detenção hidráulica (TDH) e as cargas orgânicas volumétricas (COV) aplicadas no RAHML foram de 12 e 10 h e 53 e 61 g DQO (L d)-1, respectivamente. O RBS foi operado com ciclo de 24 h e COV de 0,34 e 0,50 g DQO (L d)-1. As eficiências médias de remoção de DQOtotal e SST para o conjunto de reatores anaeróbios horizontais, em série, foram de 96 e 99%, e de 96 e 95%, respectivamente. As maiores produções volumétricas de metano ocorreram nos RAHLF, com valores médios de até 0,744 m³ CH4 (m³ reator d)-1. A inclusão do RBS permitiu melhorar a qualidade do efluente e a estabilidade do sistema de tratamento, atingindo eficiências de remoção de DQOtotal e SST de 99 e 99%, e de 98 e 99%, respectivamente. No RBS, ocorreu nitrificação e desnitrificação, com remoções de N-amoniacal de até 65%.
An anaerobic-aerobic combined system was evaluated to treat swine wastewater with an average total suspended solids (TSS) concentration of 18,624 to 11,395 mg L-1. The anaerobic treatment system was constituted by four horizontal reactors each one having a total volume of 49.5 L, one with sludge blanket (HASBR) and tree with fixed film (HAFFR) installed in series, followed by an aerobic sequential batch reactor (SBR) with continue feeding, with total volume of 339 L. In the HAFFR was used as support to fix the film bamboo and plastic rings, and wad (Luffa cillyndrica). The hydraulic detention time (HDT) and the volumetric organic load (VOL) applied in HASBR were respectively 12 and 10 h, and 52.6 and 60.9 g COD (L d)-1. The SBR was operated in a 24 hours operational cycle with VOL of 0.34 and 0.50 g COD (L d)-1. The average of total COD and TSS removed in horizontal anaerobic reactors set were of 96 to 99% and of 96 to 95%, respectively. The higher methane production happened in HAFFR with values up to 0.744 m³ CH4 (m³ reactor d)-1. With the SBR inclusion improved the effluent quality and the stability of treatment system and COD and TSS removal increased to 99 and 99%, and to 98 and 99%, respectively. In the SBR occurred nitrification and denitrification, with ammoniacal-N removal up to 65%.
An anaerobic-aerobic combined system was evaluated to treat swine wastewater with an average total suspended solids (TSS) concentration of 18,624 to 11,395 mg L-1. The anaerobic treatment system was constituted by four horizontal reactors each one having a total volume of 49.5 L, one with sludge blanket (HASBR) and tree with fixed film (HAFFR) installed in series, followed by an aerobic sequential batch reactor (SBR) with continue feeding, with total volume of 339 L. In the HAFFR was used as support to fix the film bamboo and plastic rings, and wad (Luffa cillyndrica). The hydraulic detention time (HDT) and the volumetric organic load (VOL) applied in HASBR were respectively 12 and 10 h, and 52.6 and 60.9 g COD (L d)-1. The SBR was operated in a 24 hours operational cycle with VOL of 0.34 and 0.50 g COD (L d)-1. The average of total COD and TSS removed in horizontal anaerobic reactors set were of 96 to 99% and of 96 to 95%, respectively. The higher methane production happened in HAFFR with values up to 0.744 m³ CH4 (m³ reactor d)-1. With the SBR inclusion improved the effluent quality and the stability of treatment system and COD and TSS removal increased to 99 and 99%, and to 98 and 99%, respectively. In the SBR occurred nitrification and denitrification, with ammoniacal-N removal up to 65%.
Descrição
Palavras-chave
tratamento anaeróbio-aeróbio-anóxico, pós-tratamento, remoção de nutrientes, tratamento terciário, nitrogênio, combined anaerobic-aerobic-anaoxic treatment, post-treatment, nutrients removal, tertiary treatment, nitrogen
Como citar
Engenharia Agrícola. Associação Brasileira de Engenharia Agrícola, v. 31, n. 4, p. 781-794, 2011.