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Study on Removal of Pb and Hg from MSWI Fly Ash by Aspergillus niger Leaching

Zhao GAO  Huijun LI  Li JIAN  Shaobai WEN  Juyi GAO  Fangwei GAO  
【摘要】:Fly ash from a municipal solid waste incineration plant in Haikou was taken as the research object. The biological toxicity of its leachate was determined by luminescent bacteria method. The leaching toxicity of the leachate was determined by atomic fluorescence spectrometry. The results showed that the leaching with Aspergillus niger had good removal effect on As and Hg,and the leached fly ash and leachate could meet the safe discharge standard. 37 ℃ was the best temperature for A. niger leaching. The concentrations of As and Hg in fly ash leachate were reduced to 0. 438 and 0. 053 g/L,respectively after 5 d of leaching by A. niger at 37 ℃. The luminous intensity of leachate increased with the increase of the number of days. Therefore,the leaching with A. niger can effectively remove As and Hg in fly ash from municipal solid waste incineration,and the leachate can also meet the safe discharge standard.

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