%0 Journal Article
%T Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method Partida de reatores anaer¨®bios horizontais com manta de lodo e de leito fixo para tratamento de ¨¢guas residu¨¢rias do beneficiamento de frutos do cafeeiro por via ¨²mida
%A Roberto A. de Oliveira
%A Natani M. N. Bruno
%J Engenharia Agr¨ªcola
%D 2013
%I Sociedade Brasileira de Engenharia Agr¨ªcola
%X In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3), installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal) of 16,003 mg L-1. The hydraulic retention time (HRT) in each reactor was 30 h. The volumetric organic loading (VOL) applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d)-1. The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3), stabilizing above 80% after 30 days of operation. The mean content of methane in the biogas were of 70 to 76%, the mean volumetric production was 1.7 L CH4 (L reactor d)-1 in the system, and the higher conversions were around at 0.20 L CH4 (g CODremoved)-1 in R1 and R2. The mean values of pH in the effluents ranged from 6.8 to 8.3 and the mean values of total volatile acids remained below 200 mg L-1 in the effluent of R3. The concentrations of total phenols of the affluent ranged from 45 to 278 mg L-1, and the mean removal efficiency was of 52%. The start-up of the anaerobic treatment system occurred after 30 days of operation as a result of inoculation with anaerobic sludge with active microbiota. Foram avaliados os procedimentos de partida de sistema de tratamento com tr¨ºs reatores anaer¨®bios horizontais (R1, R2 e R3), instalados em s¨¦rie, com volume de 1,2 L cada. O R1 com manta de lodo e o R2 e R3 atrav¨¦s de suporte de bambu e fibra de coco, respectivamente. Como afluente,foram sintetizadas ¨¢guas residu¨¢rias do despolpamento mecanico dos frutos do cafeeiro por via ¨²mida, com valor m¨¦dio de demanda qu¨ªmica de oxig¨ºnio total (DQOtotal) de 16.003 mg L-1. O tempo de deten  o hidr¨¢ulica (TDH) em cada reator foi de 30 h. As cargas organicas volum¨¦tricas (COV) no R1 foram de 8,9 a 25,0g DQOtotal (L d)-1. As efici¨ºncias de remo  o de DQOtotal variaram de 43 a 97% no sistema de tratamento (R1+R2+R3), estabilizando acima de 80% ap¨®s 30 dias de opera  o. Os teores m¨¦dios de metano no biog¨¢s foram de 70 a 76%, a produ  o volum¨¦trica m¨¦dia de 1,7 L CH4 (L reator d)-1 no sistema, e as convers es mais altas, de 0,20 L CH4(g DQOremovida)-1, ocorreram no R1 e R2. Os valores m¨¦dios de pH nos efluentes foram de 6,8 a 8,3 e de ¨¢cidos vol¨¢teis totais permaneceram abaixo de 200 mg L-1 no efluente do R3.As concentra  es de fen¨®is totais do afluente vari
%K carga organica volum¨¦trica
%K bambu
%K metano
%K fen¨®is
%K reatores em s¨¦rie
%K volumetric organic loading
%K bamboo
%K methane
%K phenols
%K reactors in series
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200014