Bioleaching of fly ash from municipal solid waste incineration using kitchen waste saccharified solution as culture medium

Reduced sugar in saccharified solution from kitchen waste was used as the carbon source. domesticated a. niger as 3.879c,which can withstand 20% of kitchen waste,was used as the inoculum in the bioleaching process of municipal solid waste incineration fly ash. the effect of reduced sugar concentration,fly ash concentration,and medium volume on the heavy metal extraction and yield of fly ash as well as the optimum bioleaching conditions; the inoculation amount of as 3 .879c 1% (v/v),reduced sugar concentration of 80 g/l,fly ash concentration of 20 g/l,medium volume of 200 ml,and the addition of fly ash (20 g/l) after culturing for 4 days at 30 °c and 140 r/min were obtained. under the optimum condition,the extraction yield of the seven tested heavy metals are in the order of cd > zn > cu > mn > pb > cr > fe; the extraction yield of cd and zn reached 88.7% and 73.1% respectively. fly ash satisfied the standard for pollution control on the security landfill site for hazardous wastes (gb 18598-2001) after heavy metal extraction.