37.  Evolution of Heavy Metals Concentration when Using Electro Screened Ash in Building Materials

Authors: M. Stefanut, C. Badea, I. Balcu, D. Buzatu, O. Matea


Abstract:

In the paper, the possibility of dense slurry reuse is studied, from COLTERM S.A. of Timisoara Thermal Plant, by embedding them into various building materials and by observing the heavy metal concentration evolution, contained originally by the slurry. The dense slurry usually had density of 1.36 kg/dm3, results as mixture of fly ash (resulted from burning the lignite coal) and the same quantity of water into the thermal plant; this operation is made with special devices. The building materials, poured in cube shape, were compacted manually, by shaking and keept in air until when were mechanical tested (compression strength). Migration of heavy metals, (Cr, Cu, Ni, Zn, Pb, Cd, Sr), from these materials into the soil, was analyzed by immersing the hardened cubs into ultrapure water (Millipore), simulating conditions of repeated torrential rainfalls. Determining the exact concentration, was made using novAA 400 G atomic absorption spectrophotometer, equipped with MP60 autosampler, graphite oven, specialized software, WinAAS, for continuous data processing and predefined methods (CookBook).


Keywords: dense slurry, fly ash, dumps ash, concentration, methods

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