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Activated sludge-loaded polyvinyl alcohol microparticles for starch wastewater treatment in an airlift bioreactor

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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 (COD Mn ) 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 COD Mn at the hydraulic retention time of 8 h.

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Authors and Affiliations

  1. Ministry of Environmental Protection of the Republic of Serbia, Omladinskih Brigada 1, 11070, New Belgrade, Serbia

    Slobodan Cvetkovic

  2. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia

    Branko Bugarski & Bojana Obradovic

Authors
  1. Slobodan Cvetkovic
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  2. Branko Bugarski
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  3. Bojana Obradovic
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Correspondence to Bojana Obradovic.

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Cvetkovic, S., Bugarski, B. & Obradovic, B. Activated sludge-loaded polyvinyl alcohol microparticles for starch wastewater treatment in an airlift bioreactor. Korean J. Chem. Eng. 35, 324–327 (2018). https://doi.org/10.1007/s11814-017-0313-9

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  • DOI: https://doi.org/10.1007/s11814-017-0313-9

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