Removal of some heavy metals during thermal treatment of a model solid waste under different ambient gases (carbon monoxide [CO], nitrogen [N2], and air) was studied. Compared with the removal under N2 and air, removal of cadmium was significantly enhanced by CO at temperatures of 700°C and 800°C. Nickel removal was highest at 700°C, whereas removal of lead and zinc was highest at 800°C, also under CO. The enhancement trend correlated with the evaporation temperatures of the zero-valent forms of the metals. These show the potential of thermal treatment with a reducing CO gas in removing some heavy metals from solid wastes.
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