4.4 Article

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

Journal

Publisher

SPRINGER
DOI: 10.1007/s00128-014-1422-3

Keywords

Stabilization; Tannery sludge; Chromium; Phosphogypsum; Radioactivity

Funding

  1. European Union (European Social Fund - ESF)
  2. Greek national funds through the Operational Program Education and Lifelong Learning'' of the National Strategic Reference Framework (NSRF)
  3. Research Funding Program: THALES: Reinforcement of the interdisciplinary and/or inter-institutional research and innovation

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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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