10.1007/s40095-014-0112-6

Porosity of expanded clay manufactured with addition of sludge from the brewing industry

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  • Carmen Martínez García*1,
  • Teresa Cotes Palomino1,
  • Francisco J. Iglesias Godino1,
  • Francisco A. Corpas Iglesias1,
  1. Department of Chemical, Environmental and Materials Engineering, E.P.S. Linares, University of Jaen, Linares, Jaén, 23700, ES
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Published in Issue 2014-08-02

How to Cite

García, C. M., Palomino, T. C., Godino, F. J. I., & Iglesias, F. A. C. (2014). Porosity of expanded clay manufactured with addition of sludge from the brewing industry. International Journal of Energy and Environmental Engineering, 5(4 (December 2014). https://doi.org/10.1007/s40095-014-0112-6
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Abstract

Abstract This study describes the industrial use of waste generated from the brewing industry, specifically sludge from a wastewater treatment plant. The processing technique was developed to produce ceramic material with the potential for use as a lightweight aggregate in construction. This waste is usually dumped in landfills, but the current increase in restrictions on dumping and interest in improving the environment make our proposal for gaining value from this sludge a significant contribution. The chemical composition of the raw materials was analyzed (using X-ray fluorescence and elemental analysis) and their thermal behavior evaluated (thermogravimetric analysis and differential thermal analysis). To determine the effect of adding sludge to the aggregate, different compositions were then prepared and tested. To obtain the material’s final resistance and cohesion, the dried sample was subjected to a firing process in a kiln. The samples were prepared without special pre-treatment steps, such as milling, and without the addition of expansive additive. The new aggregate has a low bulk density, due to the formation of an internal cellular structure, a porous internal and a partially vitrified external shell. As waste is added, water absorption increases by values of 17–26 %, as does the porosity, resulting in a linear relationship between the pore volume and percentage of sludge added.

Keywords

  • Sludge,
  • Lightweight aggregate,
  • Waste reuse
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