Leaching of Heavy Metals from Municipal Solid Waste Incineration (MSWI) Fly Ash Using Nitric Acid

Hai Ying Zhang; Guo Xian Ma

doi:10.4028/www.scientific.net/AMM.249-250.918

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 249-250Leaching of Heavy Metals from Municipal Solid...

Leaching of Heavy Metals from Municipal Solid Waste Incineration (MSWI) Fly Ash Using Nitric Acid

Abstract:

The presence of heavy metals in municipal solid waste incineration (MSWI) fly ash is of environmental concern due to their leaching potential in landfill environments. Acid extraction is a conventional method of safe treatment of fly ash. In this work, nitric acid was used as the extraction acid to leach Ni, Zn, Pb and Cu out from the ash. In addition, influence of nitric acid concentration and liquid to solid ratio on removal ratio of the four heavy metals was studied. It was found that removal ratio followed the decreasing sequence of Pb > Cd > Cu > Zn for acid extraction using nitric acid. The optimal extraction condition was 5.3 mol/L of nitric concentration at 20 liquid to solid ratio, which resulted in a removal ratio of 98% for Pb, 86% for Cd, around 73% for Cu and around 42% for Zn.

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Periodical:

Applied Mechanics and Materials (Volumes 249-250)

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918-921

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https://doi.org/10.4028/www.scientific.net/AMM.249-250.918

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Online since:

December 2012

Authors:

Hai Ying Zhang, Guo Xian Ma

Keywords:

Fly Ash (FA), Heavy Metal, Leaching, MSWI, Nitric Acid

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