Tratamento de águas residuárias de suinocultura em reatores anaeróbios de fluxo ascendente com manta de lodo (uasb) em dois estágios seguidos de reator operado em batelada sequencial (RBS)

Abstract

RESUMO:Neste trabalho, avaliou-se o desempenho de dois reatores anaeróbios de fluxo ascendente com manta de lodo (UASB), em série, seguidos de um reator operado em batelada sequencial (RBS) com etapa aeróbia, no tratamento de águas residuárias de suinocultura. O sistema de tratamento anaeróbio em dois estágios foi alimentado com águas residuárias de suinocultura com concentrações médias de sólidos suspensos totais (SST), de 4.427 a 16.425 mg L -1 . As cargas orgânicas volumétricas (COV) aplicadas no reator UASB do primeiro estágio variaram de 14,8 a 24,4 g DQO (L d) -1 . Os tempos de detenção hidráulica (TDH) foram de 28 e 11 h e de 14 e 6 h no primeiro e segundo reatores UASB, respectivamente. O RBS foi operado com 1 e 2 ciclos diários de alimentação e com concentrações de SST do afluente, de 1.348 a 2.036 mg L -1 . As maiores eficiências de remoção de DQO total ocorreram com os maiores TDH, com valores médios de 78 a 88% nos reatores UASB, em dois estágios. Com o tratamento do efluente dos reatores UASB no RBS, as eficiências médias de remoção aumentaram para 93 a 97%, 92 a 98%, 57 a 78%, 71 a 88% e 68 a 85% para a DQO total, SST, P-total, nitrogênio total Kjeldahl (NTK) e nitrogênio total (NT), respectivamente. Para os coliformes termotolerantes, as remoções foram de 93,80 a 99,99%.PALAVRAS-CHAVE: remoção de nutrientes, tratamento anaeróbio-aeróbio, pós-tratamento, nitrificação. SWINE WASTEWATER TREATMENT IN UPFLOW ANAEROBIC SLUDGE BLANKET REACTOR (UASB) IN TWO-STAGES FOLLOWED BY SEQUENCING BATCH REACTOR (SBR)ABSTRACT: This work aimed to evaluate the performance of two aerobic-anaerobic combination system of upflow anaerobic sludge blanket digestion reactor (UASB) in line followed by an aerobic sequencing bath reactor (SBR), used in swine wastewater treatment. The UASB system was fed with swine wastewater containing from 4427 to 16425 mg L -1 of total suspended solids (TSS). The treatment system was evaluated using organic loading (OLR) of 14,8 to 24,4 g total COD (L d) -1 in the first UASB reactor. The hydraulic detention times (HDT) were of 28 and 11 h, and 14 and 6 h, in the first and second UASB reactor, respectively. The SBR was operated with one and two cycles daily and the affluent had TSS concentrations of 1348 to 2036 mg L -1 . The higher total chemical oxygen demand (COD) removal efficiencies were of 78 to 81% in UASB reactors in two-stage and occurred with higher HDT. With the aerobic SBR used as post-treatment of the effluent from UASB reactors allowed removal efficiency averages of 93 to 97%, 92 to 98%, 57 to 78%, 71 to 88% and from 68 to 85% of total COD, TSS, total P, total Kjeldahl nitrogen (TKN) and total nitrogen (TN), respectively. The thermotolerants coliforms the removals were of 93.80 to 99.99%.

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee

“…The two stage anaerobic process consists of two reactors in series, the first for the conversion of soluble compounds and mainly the partial hydrolysis and retention of particulate organic matter, and the second to complement the conversion of soluble compounds of the affluent and the ones formed in the first reactor. In addition, important contributions have been observed in the removal of N, P, metals and coliforms in two-stage or serial anaerobic (BRUNO & OLIVEIRA, 2008;SANTANA & OLIVEIRA, 2011;ABREU & OLIVEIRA NETO, 2009DUDA & OLIVEIRA 2009). In general, in anaerobic reactors, effluents that fit completely in the patterns of Brazilian environmental legislation are not produced.…”

Swine wastewater treatment using an anaerobic baffled (ARB) and a UASB reactor system

“…At these facilities, the water used for cleaning drains feces, urine, and feed leftovers to a holding tank, which are then dumped into a course of water or disposed onto the soil without discretion, which in excess can cause toxicity (PEREIRA et al, 2009(PEREIRA et al, , 2010(PEREIRA et al, , 2011SANTANA, 2011).…”

Partida de reator anaeróbio compartimentado em série com um reator anaeróbio de manta de lodo, utilizando parâmetros de sedimentabilidade para formação da biomassa

“…Todavia, assim como outros reatores anaeróbios de alta taxa, apresenta limitações para o tratamento de águas residuárias com elevadas concentra- Segundo Kim et al (2009), uma das grandes dificuldades no tratamento de ARS é a alta concentração de sólidos suspensos prejudiciais à hidrólise. O uso do processo anaeróbio em dois estágios, com a hidrólise parcial da matéria orgânica particulada (no primeiro reator) e a conversão (no segundo reator) dos compostos solúveis formados no primeiro reator, pode atenuar esse problema (OLIVEIRA & SANTANA, 2011;PEREIRA et al, 2011;MOTERANI, 2013).…”