Balanço de massa de reatores anaeróbicos de fluxo ascendente com manta de lodo (UASB) tratando águas residuárias de suinocultura
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Data
2004-12-01
Autores
Oliveira, Roberto A. de [UNESP]
Foresti, Eugênio
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Engenharia Agrícola (SBEA)
Resumo
Foi obtido o balanço de massa, a partir dos valores médios das determinações de demanda química de oxigênio (DQO) e produção de metano (CH4), em dois reatores UASB de bancada com volume de 10,5 L tratando águas residuárias de suinocultura, submetidos a condições operacionais distintas no que diz respeito às concentrações de sólidos suspensos totais do afluente (SST de 500; 1.000; 1.500 e 2.000 mg L-1), tempo de detenção hidráulica (TDH de 30; 20; 12 e 8 h), taxas de carregamento orgânico volumétrico (TCOV de 0,8 a 8,0 kg DQO total (m³ d)-1) e temperatura (ambiente e controlada a 25º e 30ºC). Verificou-se que a DQO total removida convertida em CH4 variou de 28 a 51% e a relação DQO-CH4 por DQO dissolvida removida de 0,94 a 2,07; indicando alta participação da remoção física dos sólidos do afluente, de 49 a 72%, na remoção de DQO total nos reatores, a qual variou de 75 a 92%. A concentração de SST do afluente, a temperatura, o TDH e a TCOV influenciaram nesse desempenho dos reatores UASB.
The mass balance was acquired out in order to determinate the mean values of chemical oxygen demand (COD) and methane (CH4) production from two UASB reactors treating swine wastewater subjected to distinct operational conditions in respect to concentrations of total suspended solids of the affluent (TSS of 500; 1,000; 1,500 and 2,000 mg L-1), hydraulic detention time (HDT of 30; 20; 12 and 8 h), volumetric organic loading rates (VOLR of 0.8 to 8.0 kg COD (m³ d)-1) and temperature (ambient, 25 ºC and 30 ºC). It was verified that values of total COD removed and converted in CH4 varied from 28 to 51% and the ratio values of COD-CH4 by removed and dissolved COD varied from 0.94 to 2.07; indicating a high participation of physical removal (49 to 72%) of the affluent solids in the process. The TSS concentrations, temperature, HDT and VOLR influenced the UASB reactors performance.
The mass balance was acquired out in order to determinate the mean values of chemical oxygen demand (COD) and methane (CH4) production from two UASB reactors treating swine wastewater subjected to distinct operational conditions in respect to concentrations of total suspended solids of the affluent (TSS of 500; 1,000; 1,500 and 2,000 mg L-1), hydraulic detention time (HDT of 30; 20; 12 and 8 h), volumetric organic loading rates (VOLR of 0.8 to 8.0 kg COD (m³ d)-1) and temperature (ambient, 25 ºC and 30 ºC). It was verified that values of total COD removed and converted in CH4 varied from 28 to 51% and the ratio values of COD-CH4 by removed and dissolved COD varied from 0.94 to 2.07; indicating a high participation of physical removal (49 to 72%) of the affluent solids in the process. The TSS concentrations, temperature, HDT and VOLR influenced the UASB reactors performance.
Descrição
Palavras-chave
digestão anaeróbia, tratamento anaeróbio, resíduos de suinocultura, anaerobic digestion, anaerobic treatment, swine waste
Como citar
Engenharia Agrícola. Associação Brasileira de Engenharia Agrícola, v. 24, n. 3, p. 807-820, 2004.