Desempenho de reator anaeróbio-aeróbio de leito fixo no tratamento de esgoto sanitário

Abreu, Sérgio Brasil; Zaiat, Marcelo

doi:10.1590/s1413-41522008000200008

Cited by 19 publications

(9 citation statements)

References 2 publications

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“…), respectively. Similar behavior was observed by Kreutz, Passig, Carvalho, Mees, and Gomes (2014) that verified 59% of organic matter removal in the same configuration of the reactor treating raw cattle slaughterhouse effluent; and Abreu and Zaiat (2008) that obtained removal of 37% to COD when an anaerobic-aerobic reactor was operated with θ t of 8 hours, increasing to 46% when the θ t was reduced to 6 hours in the treatment of sewage.…”

Section: Modelsupporting

confidence: 79%

<b>Effect of hydraulic retention time on hydrodynamic behavior of anaerobic-aerobic fixed bed reactor treating cattle slaughterhouse effluent

et al. 2017

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ABSTRACT. The study of the hydrodynamic behavior in reactors provides characteristics of the flow regime and its anomalies that can reduce biological processes efficiency due to the decrease of the useful volume and the hydraulic retention time required for the performance of microbial activity. In this study, the hydrodynamic behavior of an anaerobic-aerobic fixed bed reactor, operated with HRT (hydraulic retention time) of 24, 18 and 12 hours, was evaluated in the treatment of raw cattle slaughterhouse wastewater. Polyurethane foam and expanded clay were used as support media for biomass immobilization. Experimental data of pulse type stimulus-response assays were performed with eosin Y and bromophenol blue, and adjusted to the single-parameter theoretical models of dispersion and N-continuous stirred tank reactors in series (N-CSTR). N-CSTR model presented the best adjustment for the HRT and tracers evaluated. RDT (residence time distribution) curves obtained with N-CSTR model in the assays with bromophenol blue resulted in better adjustment compared to the eosin Y. The predominant flow regime in AAFBR (anaerobic aerobic fixed bed reactor) is the N-CSTR in series, as well as the existence of preferential paths and hydraulic short-circuiting.Keywords: combined system, tracer studies, tailing phenomena, diffusion.Efeito do tempo de retenção hidráulica no comportamento hidrodinâmico de um reator anaeróbio-aeróbio tratando efluente de abatedouro bovino RESUMO. O estudo do comportamento hidrodinâmico em reatores fornece as características do regime de vazão e suas anomalias que podem reduzir a eficiência do processo biológico, por meio da diminuição do volume útil e tempo de retenção hidráulica necessária para o desenvolvimento da atividade microbiológica. Neste estudo, foi avaliado o comportamento hidrodinâmico de um reator anaeróbio-aeróbio de leito fixo, operado com TRH (tempo de retenção hidráulica) de 24, 18 e 12 h, no tratamento de efluente bruto de abatedouro bovino. Para a imobilização da biomassa foram utilizados, como meio suporte, espuma de poliuretano e argila expandida. Os dados experimentais dos ensaios estímulo resposta, tipo pulso, foram realizados com eosina Y e azul de bromofenol e ajustados para os modelos de dispersão teóricos uniparamétricos de tanques de mistura completa em série (N-CSTR). O N-CSTR apresentou os melhores ajustes para o TRH e os traçadores avaliados. As curvas DTR (distribuição do tempo de retenção hidráulica) obtidas com o modelo de tanques em série nos ensaios com azul de bromofenol resultaram em melhor ajuste comparado a eosina Y. O regime predominante no RAALF (reator anaeróbio-aeróbio de leito fixo) foi o de mistura completa também como a existência de caminhos preferenciais e curtos-circuitos hidráulicos.Palavras-chave: sistema combinado, estudo de traçadores, fenômeno de cauda longa, difusão.

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Section: Modelsupporting

confidence: 79%

<b>Effect of hydraulic retention time on hydrodynamic behavior of anaerobic-aerobic fixed bed reactor treating cattle slaughterhouse effluent

et al. 2017

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“…Step II, with recirculation, a reduction of the bicarbonate alkalinity along the height of the AAFBR of 586 ± 75 to 294 ± 220 mgCaCO 3 L -1 for θ of 11 h and 963 ± 150 to 625 ± 263 mgCaCO 3 L -1 for θ of 8 h. ABREU & ZAIAT (2008) evaluated the performance of an anaerobicaerobic reactor filled with polyurethane foam for the treatment of sewage, operated with θ of 12h, and also confirmed the reduction of bicarbonate alkalinity of 143 ± 38mgCaCO 3 L -1 in the affluent and 58 ± 62mgCaCO 3 L -1 in the effluent when the reactor was operated in combined condition.…”

Section: Ln = -K Tmentioning

confidence: 99%

Performance of an anaerobic-aerobic reactor and kinetic study of organic matter removal of cattle slaughterhouse effluent

et al. 2014

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This paper sought to evaluate the behavior of an upflow Anaerobic-Aerobic Fixed Bed Reactor (AAFBR) in the treatment of cattle slaughterhouse effluent and determine apparent kinetic constants of the organic matter removal. The AAFBR was operated with no recirculation (Phase I) and with 50% of effluent recirculation (Phase II), with θ of 11h and 8h. In terms of pH, bicarbonate alkalinity and volatile acids, the results indicated the reactor ability to maintain favorable conditions for the biological processes involved in the organic matter removal in both operational phases. The average removal efficiencies of organic matter along the reactor height, expressed in terms of raw COD, were 49% and 68% in Phase I and 54% and 86% in Phase II for θ of 11h and 8h, respectively. The results of the filtered COD indicated removal efficiency of 52% and k = 0.0857h -1 to θ of 11h and 42% and k = 0.0880h -1 to θ of 8h in the Phase I. In Phase II, the removal efficiencies were 59% and 51% to θ of 11h and 8h, with k = 0.1238h -1 and k = 0.1075 h -1 , respectively. The first order kinetic model showed good adjustment and described adequately the kinetics of organic matter removal for θ of 11h, with r 2 equal to 0.9734 and 0.9591 to the Phases I and II, respectively. KEYWORDS: kinetic, cattle slaughterhouse, combined treatment system. DESEMPENHO DE UM REATOR ANAERÓBIO-AERÓBIO E ESTUDO CINÉTICO DE REMOÇÃO DE MATÉRIA ORGÂNICA DE EFLUENTE BOVINORESUMO: O objetivo deste estudo foi avaliar o desempenho de um Reator Anaeróbio-Aeróbio de Leito Fixo (RAALF) com escoamento ascendente, no tratamento de efluente bruto de matadouro bovino, e obter constantes cinéticas aparentes da remoção de matéria orgânica. O RAALF foi operado sem recirculação (Etapa I) e com 50% de recirculação do efluente (Etapa II), com θ de 11 h e 8 h. Em termos de pH, alcalinidade a bicarbonato e ácidos voláteis, os resultados indicaram que o RAALF apresentou capacidade em manter condições favoráveis para os processos biológicos envolvidos na remoção de matéria orgânica, em ambas as etapas operacionais. As eficiências médias de remoção de matéria orgânica ao longo da altura do reator, expressa em termos de DQO bruta, foram de 49% e 68% na Etapa I e de 54% e 86% na Etapa II, para θ de 11 h e 8 h, respectivamente. Os resultados de DQO filtrada indicaram eficiências de remoção de 52% e k = 0,0857 h -1 para θ de 11 h e 42% e k = 0,0880 h -1 para θ de 8 h na Etapa I. Na Etapa II, as eficiências de remoção foram 59% e 51% para θ de 11 h e 8 h, com k = 0,1238 h -1 e k = 0,1075 h -1 , respectivamente. O modelo cinético de primeira ordem indicou bom ajuste e descreveu adequadamente a cinética de remoção de matéria orgânica para θ de 11 h, com r 2 igual a 0,9734 e 0,9591 para as Etapas I e II, respectivamente.

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“…Mockaitis et al [24] verified a concentration of 12200 mgL -1 of volatile solids, which resulted in COD removal of 78.0%. Abreu and Zaiat [37] verified an attachment of 3350 mgL -1 of volatile solids, with a COD removal of 64.0%. Although the differences of biofilm amount in the reactors, they all presented satisfactory performance in organic matter removal, as well as reported by Fia et al [38], when compared to slag, foam and crashed stone.…”

Section: Discussionmentioning

confidence: 87%

Use of Coffee Capsules as Support Material in Upflow Anaerobic Fixed Bed Reactors

Souza

Oliveira

Bello

et al. 2019

Braz. arch. biol. technol.

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The aim of this work is to evaluate the performance of upflow anaerobic fixed bed reactors filled with espresso coffee capsules to treat sanitary sewage. Three reactors (R1, R2 and R3) were constructed in blue PVC pipes measuring 30 cm height and 150 mm diameter and filled with coffee capsules made of aluminum and plastic. The sewage from the pre-treatment phase of the wastewater treatment plant of the Federal University of Lavras fed the system. Temperature, pH, alkalinity and volatile acids concentration, COD, TS, TVS and TSS of the influent and effluent were analyzed to evaluate the reactors HIGHLIGHTS • Reusing coffee capsules as an alternative to theirs disposal. • Low cost wastewater treatment. • Ally solutions for the treatment of liquid and solid waste. Souza, G.R.; et al.

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Desempenho de reator anaeróbio-aeróbio de leito fixo no tratamento de esgoto sanitário

Cited by 19 publications

References 2 publications

<b>Effect of hydraulic retention time on hydrodynamic behavior of anaerobic-aerobic fixed bed reactor treating cattle slaughterhouse effluent

<b>Effect of hydraulic retention time on hydrodynamic behavior of anaerobic-aerobic fixed bed reactor treating cattle slaughterhouse effluent

Performance of an anaerobic-aerobic reactor and kinetic study of organic matter removal of cattle slaughterhouse effluent

Use of Coffee Capsules as Support Material in Upflow Anaerobic Fixed Bed Reactors

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