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      Tratabilidade do lodo biológico têxtil e produção de biogás em reator UASB em diferentes temperaturas Translated title: Textile biological sludge treatability and biogas production in UASB reactor under different temperatures

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          Abstract

          RESUMO Neste trabalho avaliou-se o comportamento de um reator UASB em escala laboratorial (16 L) no tratamento de lodo biológico têxtil com produção de biogás, operando em diferentes temperaturas, 35 (mesofílica), 45 e 55ºC (termofílica), com tempo de detenção hidráulica (TDH) constante de 24 h. O reator UASB apresentou-se apto a tratar o lodo têxtil, sendo influenciado positivamente pelo incremento da temperatura, mostrando maiores remoções nas temperaturas termofílicas e com altas taxas de remoção de todos os parâmetros físico-químicos monitorados: demanda química de oxigênio (DQO) (97% em 45 e 55ºC), demanda bioquímica de oxigênio (DBO) (95% em 45ºC e 94% em 55ºC), fósforo total (P-total) (95% a 45 e 55ºC) e nitrogênio total (N-total) (94% a 45 e 55ºC). Quanto à produção de biogás e à concentração de metano, os maiores valores foram observados a 45ºC. Com base nos resultados alcançados, confirmam-se a tratabilidade do lodo têxtil e a produção de biogás em UASB, com melhor performance a 45ºC.

          Translated abstract

          ABSTRACT The aim of this work was to evaluate the behavior of a laboratory-scale UASB reactor (16 L) in the treatment of textile biological sludge with biogas production, operating at different temperatures - 35 (mesophilic), 45 and 55ºC (thermophilic) -, with constant hydraulic retention time of 24 h. The UASB reactor was able to treat the textile sludge, being positively influenced by increasing temperature, with greater removals in thermophilic temperatures and high removal rates of all monitored physical and chemical parameters: chemical oxygen demand (COD) (97% at 45 and 55ºC), biochemical oxygen demand (BOD) (95% at 45ºC and 94% at 55ºC), total phosphorus (P-total) (95% at 45 and 55ºC) and total nitrogen (N-total) (94% at 45 and 55ºC). As for biogas production and methane concentration, the highest values were observed at 45ºC. Based on the results, textile sludge treatability and biogas production in UASB are confirmed, with best performance at 45ºC.

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          Effects of solid retention time on anaerobic digestion of dewatered-sewage sludge in mesophilic and thermophilic conditions

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            Avaliação de desempenho de reator UASB no tratamento de águas residuárias de suinocultura

            Este trabalho apresenta o desenvolvimento e a avaliação de um sistema de tratamento de águas residuárias de suinocultura constituído de decantador e seguido de reator anaeróbio de manta de lodo (reator UASB), em escala real. O reator UASB foi construído de alvenaria e concreto armado. Coletaram-se amostras do esgoto bruto e do efluente do decantador e reator UASB, e se monitoraram os seguintes parâmetros: temperatura, pH, alcalinidade, ácidos voláteis totais (AVT), sólidos suspensos totais (SST), sólidos suspensos voláteis (SSV), demanda bioquímica de oxigênio (DBO) e demanda química de oxigênio (DQO), de acordo com os métodos estabelecidos pelo Standard Methods (APHA, 1998). Os resultados médios de remoção total de DQO e de DBO foram de 93 e 92%, respectivamente. As concentrações médias de DQO, DBO e SST no efluente final foram de 0,8, 1,8 e 0,8 g L-1, respectivamente. A carga orgânica volumétrica (COV) aplicada no reator UASB variou de 1,1 a 17,5 kg DQO m-3 d-1. O sistema decantador-reator UASB apresenta-se como alternativa promissora para o tratamento de águas residuárias de suinocultura.
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              Performance and microbial community profiles in an anaerobic reactor treating with simulated PTA wastewater: from mesophilic to thermophilic temperature.

              Performance and microbial community profiles in a hybrid anaerobic reactor treating synthetic PTA wastewater (contained the major pollutants terephthalate and benzoate) were studied over 220 days from 33 °C to 52 °C. Results indicated that PTA treatment process was highly sensitive to temperature variations in terms of COD removal. Operation at 37 °C showed the best performance as well as the most diverse microbial community revealed by 16S rRNA gene clone library and T-RFLP (terminal restriction fragment length polymorphism). Finally, the anaerobic process achieved a total COD removal of 77.4%, 91.9%, 87.4% and 66.1% at 33, 37, 43 and 52 °C. While the corresponding TA removal were 77.6%, 94.0%, 89.1% and 60.8%, respectively. Sequence analyses revealed acetoclastic Methanosaeta was preponderant at 37 °C, while hydrogenotrophic genera including Methanobrevibacter and Methanofollis were more abundant at other temperatures. For bacterial community, 16 classes were identified. The largely existent Syntrophorhabdus members (belonging to δ-Proteobacteria) at 37 °C was likely to play an important role in mesophilic anaerobic wastewater treatment system contained terephthalate. Meanwhile, β-Proteobacteria seemed to be favored in an anaerobic system higher than 43 °C.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                esa
                Engenharia Sanitaria e Ambiental
                Eng. Sanit. Ambient.
                Associação Brasileira de Engenharia Sanitária e Ambiental - ABES (Rio de Janeiro, RJ, Brazil )
                1413-4152
                1809-4457
                February 2018
                : 23
                : 1
                : 151-158
                Affiliations
                [1] Rio de Janeiro Rio de Janeiro orgnameUniversidade Federal do Rio de Janeiro orgdiv1Programa de Pós-graduação em Biotecnologia Vegetal e Bioprocessos Brazil
                [2] Blumenau Santa Catarina orgnameUniversidade Regional de Blumenau orgdiv1Centro de Ciências Tecnológicas orgdiv2Programa de Pós-graduação em Engenharia Ambiental Brazil
                [3] Blumenau Santa Catarina orgnameUniversidade Regional de Blumenau orgdiv1Centro de Ciências Tecnológicas orgdiv2Departamento de Engenharia de Produção e Design e do Programa de Pós-graduação em Engenharia Ambiental Brazil
                Article
                S1413-41522018000100151
                10.1590/s1413-41522018145106
                a5eab7d5-d75e-4228-a9b5-ac0f1a5094ae

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 06 January 2017
                : 21 January 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 8
                Product

                SciELO Brazil


                biogás,biogas,lodo têxtil,digestão anaeróbia,reator UASB,textile sludge,anaerobic digestion,UASB reactor

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