Leaching characteristics of heavy metals during cement stabilization of fly ash from municipal solid waste incinerators |
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Authors: | Shunwen LIANG Jianguo JIANG Yan ZHANG Xin XU |
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Institution: | (1) Environment and Sanitary Management Department, Shenzhen, 518001, China;(2) Department of Environment Science and Engineering, Tsinghua University, Beijing, 100084, China |
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Abstract: | The leaching characteristics of heavy metals in products of cement stabilization of fly ash from a municipal solid waste incinerator
were investigated in this paper. The stabilization of heavy metals such as Cd, Pb, Cu, and Zn in fly ash from such incinerators
was examined through the national standard method in China based on the following factors: additive quantity of cement and
Na2S, curing time, and pH of leaching liquor. The results showed that as more additives were used, less heavy metals were leached
except for Pb, which is sensitive to pH of the leachate, and the worse effect was observed for Cd. The mass ratio of cement
to fly ash = 10% is the most appropriate parameter according to the national standard method. When the hydration of cement
was basically finished, stabilization of heavy metals did not vary after curing for 1 d. The mixtures of cement and fly ash
had excellent adaptability to environmental pH. The pH of leachate was maintained at 7 when pH of leaching liquor varied from
3 to 11.
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Translated from Environmental Science, 2006, 27(12): 2564–2569 译自: 环境科学] |
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Keywords: | municipal solid waste (MSW) fly ash heavy metal solidification and stabilization cement |
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