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《Journal of Anhui Agricultural Sciences》 2009-05
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Effects of Different pH Conditions on Bioavailability of Heavy Metals in Municipal Sludge

XIE Hong-zhi et al(School of Earth and Environment,Anhui University of Technology,Huainan,Anhui 232001)  
[Objective] The aim was to explore the effect of the different pH conditions on bioavailability of the heavy metals in the municipal sludge.[Method] Through the artificial pH gradient simulation for the municipal sludge after the stabilizing treatment in spring and summer,the morphological distribution law of the heavy metal elements in the municipal sludge in the different pH conditions and the effect of different pH conditions on bioavailability of the heavy metals were studied.[Result] There was more obvious difference among the contents of the different heavy metal elements in the sludge samples and the content of Zn was the highest,followed by Cu and that of Cd was the lowest.There was a relationship between the bioavailability of the heavy metals of Cu,Zn,Pb and Cd in the municipal sludge and the pH value.For the same element,the content of the exchangeable speciation of the contained heavy metal had the greater proportion in the total amount when the pH value of the sludge was lower.The size order of the pH value in the sludge was opposite to the intensity order of the bioavailability of the heavy metals.[Conclusion] The research provided the theoretical basis for the resource utilization of municipal sludge.
【CateGory Index】: X53
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