Anaerobic treatment of wastewater from coffee pulping in upflow anaerobic sludge blanket (UASB) in two stages

• Autor(a) principal: Bruno, M. [UNESP]
• Data de Publicação: 2008
• Outros Autores: Oliveira, R. A. de [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: https://elibrary.asabe.org/azdez.asp?JID=1&AID=25498&CID=lenv2009&T=2; http://hdl.handle.net/11449/70840
• topic: Anaerobic digestion; Coffee wastewater; Phenols; Anaerobic treatments; Liquid effluents; Methane productions; Organic loading rates; Removal efficiencies; Two stages; Uasb reactors; Up-flow anaerobic sludge blanket reactors; Up-flow anaerobic sludge blankets; Volatile fatty acids; Agriculture; Biogas; Chemical oxygen demand; Effluents; Fatty acids; Methane; Removal; Wastewater; Wastewater treatment

In this work, the efficiency of two-stage upflow anaerobic sludge blanket (UASB) reactors was evaluated in bench scale, for treating a liquid effluent from coffee pulping. Hydraulic detention times (HDT) were 4.0; 5.2 and 6.2 days, resulting in organic loading rates (OLR) of 5.8; 3.6 and 3.0g total COD per (L-d) in the first reactor (Rl) and HDT of 2.0; 2.6 and 3.1 days with OLR of 5.8; 0.5 and 0.4 g total COD per (L-d) in the second reactor (R2). The medium values of total COD affluent varied from 15.440 to 23.040 mg O 2/L, and in the effluent to the reactors 1 and 2 were from l.lOO to 11.500 mg 0 2/L and 420 to 9.000 mg O 2/L, respectively. The medium values of removal efficiencies of total COD and TSS varied from 66 to 98% and 93 to 97%, respectively, in the system of treatment with the UASB reactors, in two stages. The content of methane in the biogas varied from 69 to 89% in the Rl and from 52 to 73% in the R2. The maximum volumetric methane production of 0.483 m 3 CH 4per (m 3 reactor d) was obtained with OLR of 3.6 g total COD per (L reactor d) and HDT of 6.2 days in the Rl. The volatile fatty acids concentration was kept below 100mg/L with HDT of 5.2 and 6.2 days in the Rl and HDT of 2.6 and 3.1 days in the R2.