Effects of solid-phase mass transfer on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass |
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| Authors: | Cubas S A Foresti E Rodrigues J A D Ratusznei S M Zaiat M |
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| Institution: | 1. Laborato´rio de Processos Biolo´gicos, Departamento de Hidráulica e Saneamento, Escola de Engenharia de São Carlos (EESC), Universidade de São Paulo (USP), Av. Trabalhador São-Carlense, 400, CEP 13566-590, São Carlos-SP, Brazil;2. Departamento de Engenharia Química e de Alimentos, Escola de Engenharia Mauá (EEM), Instituto Mauá de Tecnologia (IMT), Praça Mauá, 1, CEP 09580-900, São Caetano do Sul, SP, Brazil;1. Department of Chemical Engineering, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1;2. Department of Chemical Engineering and Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3;1. Centre for Emerging Technologies, Jain University, Ramangaram District-562 112, Karnataka, India;2. Central Power Research Institute, Sir C. V. Raman Road, Bangalore 560 080, India;3. Ceramic Technological Institute, BHEL, Bangalore 560 012, India;1. AGH University of Science and Technology, Faculty of Energy and Fuels, al. A. Mickiewicza 30, 30-059 Krakow, Poland;2. Institut Jean Lamour, UMR CNRS – Université de Lorraine n°7198, ENSTIB, 27 rue Philippe Seguin, CS 60036, 88026 Epinal cedex, France |
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| Abstract: | This work reports on experiments for an anaerobic sequencing batch reactor containing immobilized biomass which aimed at verifying the effects of solid-phase mass transfer on the reactor's overall performance. Four experiments were carried out at 30 degrees C with cubic polyurethane foam particles previously inoculated with anaerobic biomass. Different solid-phase mass transfer conditions were reached in each experiment by varying the size of the bioparticle from 0.5 to 3.0 cm. The reactor was fed with a low-strength synthetic wastewater containing protein, carbohydrates and lipid and the effects of mass transfer were evaluated through dynamic substrate concentration profiles during 8-hour batch cycles. A modified first-order kinetic model provided a good representation of the behavior of the dynamic concentration profiles. The solid-phase mass transfer was found to slightly affect the concentration of effluent organic matter expressed as chemical oxygen demand (COD). The concentration of residual effluent substrate increased as the size of the bioparticle was increased. The cycle time was not affected as the size of the bioparticle was increased from 0.5 to 2.0 cm. However, it was found that the cycle time in a reactor with 3.0-cm cubic particles should be higher than that required in systems with smaller particles. The apparent first-order kinetic parameter was estimated as 0.59+/-0.01 h(-1) for experiments with bioparticle sizes ranging from 0.5 to 2.0 cm, while a value of 0.48 h(-1) was obtained in the experiment with 3.0-cm bioparticles. |
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