Hydrodynamics and recovered papers deinking in an ozone flotation column |
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| Authors: | D Beneventi F Almeida N Marlin D Curtil L Salgueiro M Aurousseau |
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| Affiliation: | 1. School of Engineering, The University of Newcastle, Callaghan, 2308, New South Wales, Australia;2. School of Environmental and Life Sciences, The University of Newcastle, Callaghan, 2308, New South Wales, Australia;1. Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247001, India;2. Avantha Centre for Industrial Research & Development, Paper Mill Campus, Yamuna Nagar 135001, India;1. Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya-city, Saitama 3690293, Japan;2. Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 2268503, Japan;1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;2. School of Energy Research, Xiamen University, Xiamen 361005, Fujian, China;1. Laboratory of Enzymology, Department of Cellular Biology, University of Brasília, Brasília 70910-900, DF, Brazil;2. Laboratory of Biophysics, Department of Cellular Biology, University of Brasília, Brasília 70910-900, DF, Brazil;3. Laboratory of Chemistry, Cellulose and Energy, Department of Forest Sciences, ESALQ, University of São Paulo, Piracicaba 13418-220, SP, Brazil |
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| Abstract: | This work was aimed at investigating the potential use of ozone flotation for recovered papers deinking. The mixing characteristics and the bubble size of a Venturi aerated laboratory flotation column were studied in the presence of simplified model systems and of an industrial pulp slurry. Experimental results showed that surfactants dissolved in the pulp slurry stabilized air bubbles while cellulose fibers promoted coalescence. Moreover, bubble buoyancy was sufficient to fluidize the fiber suspension generating perfect mixing. The gas–liquid transfer coefficient of ozone (kLa) estimated from gas hold-up, air bubble size and kLa measured in water was high enough (0.84 1/s) for the complete transfer of ozone in the pulp slurry and the generation of ozone-free gas effluent. With O3 dosage of 0.8 mg O3/mg COD, ozone flotation allowed increasing chemical oxygen demand removal from 41 to 63% with no effect on the ink flotation efficiency, which remained close to that obtained with air flotation, i.e. ～92%. |
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