Design Optimization for Solidification of Hazardous Wastes

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Abstract
This research evaluated factors on cement-based solidification process designed for hazardous sludge produced from electroplating industry. Four factors of sand/cement(S/C) ratio, water/cement(W/C) ratio, amount of wet sludge and amount of a precipitator were investigated in terms of leachability and compressive strength of the solidified materials. Results of triplicate tests and statistical analysis indicated that S/C ratio had the greatest effect on leaching of Cr(VI) while W/C ratio on Zn and compressive strength of the solidified materials. An experimental modeling was developed to estimate leached material concentration and compressive strength at a given condition. Proper mixing criteria were also suggested for the use of the solidified mixture as construction materials.

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