Bioleaching of Heavy Metal from Industrial Incinerator Ash

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Haddadian, Kamran | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45231 (06)
University: Sharif University of Technology
Department: Chemical & Petroleum Engineering
Advisor(s): Shayegan, Jalal
Abstract:
This study focused on the investigation of bioleaching of heavy metals from incinerator ash using Thiobacillus thiooxidans. Eight factors were examined for their significance on bioleaching using a Placket-Burman factorial design. Four significant variables (pulp density, Initial pH, sulfur Concentration and inoculation amount) were selected for the optimization studies. The combined effect of these variables on metal bioleaching was studied using a central composite design. Second order polynomials were established to identify the relationship between the recovery percent of the metals and the four significant variables. The optimal values of the variables for maximum metals bioleaching were as follows: pulp density (0.6%, W/V), initial pH (3.10-3.15), Sulfur concentration (7.75 g/L) and inoculation (7.75% V/V). The maximum metals recovery percentages from predicted models were 95% Zn, 82% Cr
Keywords:
Heavy Metals ; Experiments Design ; Bioleaching ; Incinerator Ash ; Thiobacillus Thiooxidans

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