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Received April 19, 2017
Accepted November 20, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Activated sludge-loaded polyvinyl alcohol microparticles for starch wastewater treatment in an airlift bioreactor
Ministry of Environmental Protection of the Republic of Serbia, Omladinskih Brigada 1 11070 New Belgrade, Serbia 1Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4 11000 Belgrade, Serbia
bojana@tmf.bg.ac.rs
Korean Journal of Chemical Engineering, February 2018, 35(2), 324-327(4), 10.1007/s11814-017-0313-9
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Abstract
Emulsification followed by freezing and thawing cycles was applied to produce poly(vinyl alcohol) (PVA) microparticles and to simultaneously immobilize activated sludge. Activity of the obtained microparticles (~400 μm in diameter) was evaluated in glucose syrup solutions and heat-pretreated wastewater from a starch factory by measurements of permanganate index (CODMn) reduction. The reaction followed first-order kinetics, revealing slight mass transfer limitations in PVA microparticles as determined from the kinetic rate constant that was ~35% lower than that in the freely suspended activated sludge culture. Yet, efficiency of the microparticles increased almost five-fold in a laboratory airlift bioreactor operating either in batch or continuous regimes. Over 19 days of operation under high organic loadings in the industrial wastewater (~100 kgCOD m-3 d -1), PVA microparticles (12.4% volume fraction) remained active and induced a decrease of over 90% of biodegradable CODMn at the hydraulic retention time of 8 h.
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References
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