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Utilization of Phosphogypsum in Tannery Sludge Stabilization and Evaluation of the Radiological Impact

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Abstract

The current global trend towards increasingly stringent environmental standards and efforts for efficient utilization and re-use of available by-products and/or wastes, favors the use of low-cost sorbent materials for the treatment of heavy metal-contaminated solid wastes. In this study, the stabilization of tannery sludge, produced from the physicochemical and biological treatment of tannery wastewaters, was examined by the addition of phosphogypsum (PG) at a ratio of 1:1. Characterization of the tannery sludge leachates showed high amounts of chromium which exceeded the acceptable level for disposal in non-hazardous waste landfills, while the dissolved organic carbon (DOC) concentrations exceeded the limits for disposal in landfills for hazardous wastes, according to the EU Decision 2003/33/EC. Leachates of the waste stabilized with PG presented chromium and DOC concentrations below the regulation limits for disposal in landfills for non-hazardous wastes. Moreover, mixing PG with tannery sludge resulted in a stabilized waste with reduced radioactivity.

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Acknowledgments

This research has been co-financed by the European Union (European Social Fund – ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: THALES: Reinforcement of the interdisciplinary and/or inter-institutional research and innovation.

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Authors and Affiliations

  1. Department of Chemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    E. Pantazopoulou, O. Zebiliadou, F. Noli & A. Zouboulis

  2. Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    M. Mitrakas

  3. Department of Food Technology, Alexander Technological Education Institute of Thessaloniki, 57400, Thessaloniki, Greece

    P. Samaras

Authors
  1. E. Pantazopoulou
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  2. O. Zebiliadou
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  3. F. Noli
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  4. M. Mitrakas
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  5. P. Samaras
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  6. A. Zouboulis
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Correspondence to A. Zouboulis.

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Pantazopoulou, E., Zebiliadou, O., Noli, F. et al. Utilization of Phosphogypsum in Tannery Sludge Stabilization and Evaluation of the Radiological Impact. Bull Environ Contam Toxicol 94, 352–357 (2015). https://doi.org/10.1007/s00128-014-1422-3

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  • DOI: https://doi.org/10.1007/s00128-014-1422-3

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