%0 Journal Article
%T Performance of UASB reactors in two stages under different HRT and OLR treating residual waters of swine farming Desempenho de reatores UASB em dois est¨¢gios sob diferentes TDH e COV tratando ¨¢guas residu¨¢rias de suinocultura
%A Estev£¿o Urbinati
%A Rose M. Duda
%A Roberto A. de Oliveira
%J Engenharia Agr¨ªcola
%D 2013
%I Sociedade Brasileira de Engenharia Agr¨ªcola
%X In this study it was evaluated the effects of hydraulic retention time (HRT) and Organic Loading Rate (OLR) on the performance of UASB (Upflow Anaerobic Sludge Blanket) reactors in two stages treating residual waters of swine farming. The system consisted of two UASB reactors in pilot scale, installed in series, with volumes of 908 and 188 L, for the first and second stages (R1 and R2), respectively. The HRT applied in the system of anaerobic treatment in two stages (R1 + R2) was of 19.3, 29.0 and 57.9 h. The OLR applied in the R1 ranged from 5.5 to 40.1 kg CODtotal (m3 d)-1. The average removal efficiencies of chemical oxygen demand (COD) and total suspended solids (TSS) ranged, respectively, from 66.3 to 88.2% and 62.5 to 89.3% in the R1, and from 85.5 to 95.5% and 76.4 to 96.1% in the system (R1 + R2). The volumetric production of methane in the system (R1 + R2) ranged from 0.295 to 0.721 m3CH4 (m3 reactor d)-1. It was found that the OLR applied were not limiting to obtain high efficiencies of CODtotal and TSS removal and methane production. The inclusion of the UASB reactor in the second stage contributed to increase the efficiencies of CODtotal and TSS removal, especially, when the treatment system was submitted to the lowest HRT and the highest OLR. Neste trabalho, avaliou-se o efeito do tempo de deten  o hidr¨¢ulica (TDH) e da carga organica volum¨¦trica (COV) no desempenho de reatores UASB (Upflow Anaerobic Sludge Blanket), em dois est¨¢gios, tratando ¨¢guas residu¨¢rias de suinocultura. O sistema foi constitu¨ªdo por dois reatores UASB em escala-piloto, instalados em s¨¦rie, com volumes de 908 e 188 L, para o primeiro e segundo est¨¢gios (R1 e R2), respectivamente. Os TDH, aplicados no sistema de tratamento anaer¨®bio, em dois est¨¢gios (R1 + R2), foram de 19,3; 29,0 e 57,9 h. As COVs aplicadas no R1 variaram de 5,5 a 40,1 kg DQOtotal (m3 d)-1. As efici¨ºncias m¨¦dias de remo  o de demanda qu¨ªmica de oxig¨ºnio total (DQOtotal) e s¨®lidos suspensos totais (SST) variaram, respectivamente, de 66,3 a 88,2% e de 62,5 a 89,3% no R1, e de 85,5 a 95,5% e de 76,4 a 96,1% (no sistema R1 + R2). A produ  o volum¨¦trica de metano no sistema R1 + R2 variou de 0,295 a 0,721 m3 CH4 (m3 reator d)-1. Verificou-se que as COVs aplicadas n o foram limitantes para a obten  o de altas efici¨ºncias de remo  o de DQOtotal e SST e produ  o de metano. A inclus o do reator UASB no segundo est¨¢gio contribuiu para o aumento das efici¨ºncias de remo  o de DQOtotal e SST, sobretudo quando o sistema de tratamento foi submetido aos menores TDHs e maiores COVs.
%K digest o anaer¨®bia
%K dejetos de su¨ªnos
%K g¨¢s metano
%K reatores UASB em s¨¦rie
%K tratamento em dois est¨¢gios
%K anaerobic digestion
%K swine excrements
%K methane gas
%K UASB reactors in series
%K two stage treatments
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200015