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| Lopes,Carla L.; Mees,Juliana B. R.; Sene,Luciane; Carvalho,Karina Q. de; Christ,Divair; Gomes,Simone D.. |
| This study aimed to evaluate the influence of airflow (0.25, 0.50 and 0.75 L.L-1.min-1) and cycle time (10.45 h, 14.25 h and 17.35 h) on a sequencing batch reactor (SBR) performance in promoting nitrification and denitrification of poultry slaughterhouse wastewater. The operational stages included feeding, aerobic and anoxic reactions, sedimentation and discharge. SBR was operated in a laboratory scale with a working volume of 4 L, keeping 25% of biomass retained inside the reactor as inoculum for the next batch. In the anoxic stage, C: N ratio was maintained between 5 and 6 by adding cassava starch wastewater. A factorial design (22) with five repetitions was designed at the central point to evaluate the influence of cycle time and airflow on total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrification; Denitrification; Response surface methodology; Fluorescent in situ hybridization. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300567 |
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| Andreani,Cristiane L.; Torres,Douglas G. B.; Schultz,Leonardo; Carvalho,Karina Q. de; Gomes,Simone D.. |
| Attempting to associate waste treatment to the production of clean and renewable energy, this research sought to evaluate the biological production of hydrogen using wastewater from the cassava starch treatment industry, generated during the processes of extraction and purification of starch. This experiment was carried out in a continuous anaerobic reactor with a working volume of 3L, with bamboo stems as the support medium. The system was operated at a temperature of 36°C, an initial pH of 6.0 and under variations of organic load. The highest rate of hydrogen production, of 1.1 L.d-1.L-1, was obtained with application of an organic loading rate of 35 g.L-1.d-1, in terms of total sugar content and hydraulic retention time of 3h, with a prevalence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fixed bed reactor; Agroindustrial wastes; Fermentation processes. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300578 |
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| Kreutz,Cristiane; Passig,Fernando H.; Carvalho,Karina Q. de; Mees,Juliana B. R.; Gomes,Simone D.. |
| 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,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kinetic; Cattle slaughterhouse; Combined treatment system. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000200015 |
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| Torres,Douglas G. B.; Lucas,Shaiane Dal' Maso; Andreani,Cristiane L.; Carvalho,Karina Q. de; Coelho,Silvia R. M.; Gomes,Simone D.. |
| ABSTRACT Fixed-bed reactors have been considered promise alternatives for hydrogen production due to their simple construction and increase in the biomass retention. The purpose of this study was to investigate the biological production of hydrogen in anaerobic fixed-bed reactors with cassava starch wastewater used as substrate. Different support materials and arrangements of fixed-bed were used to evaluate the biological production of hydrogen in anaerobic continuous fixed-bed reactors, with cassava starch wastewater as substrate - recycled low-density polyethylene scraps, in packed bed (R1), recycled low-density polyethylene cylinders, in ordained bed (R3) and bamboo stems, in vertical arrangement (R2 and R4). In R1 the initial pH was adjusted for 6.0,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bio-energy; Fermentative processes; Bamboo; Polyethylene; Agro-industrial effluent. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100160 |
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| Kreutz,Cristiane; Carvalho,Karina Q. de; Passig,Fernando H.; Belini,Aldria D.; Cordovil,Cláudia S. de C. M. dos S.; Gomes,Simone D.. |
| ABSTRACT The hydrodynamic behavior of an anaerobic fixed bed reactor (AFBR) was evaluated in the treatment of cattle slaughterhouse wastewater. The AFBR was operated at hydraulic retention time (HRT) of 14, 11 and 8 h. Stimulus-response assays were carried out with Eosin Y and the experimental data were adjusted to the single-parameter theoretical models of dispersion and N-continuous stirred tank reactors in series (N-CSTR). The experimental results of the residence time distribution curves showed that at lower flow rate, the reactor showed plug flow behavior with correlation coefficient (r) of 0.88 and number of dispersion of 0.2 for high dispersion (HD). However, at higher and intermediate flow rates, the AFBR behave as a complete mixture flow, (r) of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dead space volume; Hydraulic efficiency; Hydraulic short; Circuiting; Residence; Time distribution. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300403 |
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