Heavy metal concentration and speciation of seven representative municipal sludges from wastewater treatment plants in Northeast China |
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Authors: | Jiangcheng Tu Qingliang Zhao Liangliang Wei Qianqian Yang |
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Institution: | (1) Geological Survey of India, Hyderabad, 500068, India;(2) Departmento de Quimica Analitica, Universidad de Barcelona, Marti i Franques, 1-11, E-08028 Barcelona, Spain; |
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Abstract: | The analysis of heavy metals is very important for assessing the feasibility of the agricultural utilization for the municipal
sludge. In this paper, a four-step sequential extraction method was applied to extract heavy metals (Cu, Zn, Mn, Cr, and Ni)
in municipal sludges from seven individual wastewater treatment plants located in Jilin and Heilongjiang Province, China,
for estimating the mobility and bioavailability of the metal ions in the agricultural application. The total concentrations
of heavy metals and their chemical fractions after the sequential extraction were determined. Principal component analysis
(PCA) was applied to analyze the relations of heavy metals fractions in the municipal sludges. Experimental results indicated
that the total concentrations of Cu, Zn, Cr, and Ni in all sludge samples were below the threshold values set out by the Chinese
legislation (GB18918-2002). Specially, Zn had a high bioavailability and mobility, Cu and Cr had potential bioavailability,
while Mn mainly existed in the residual fraction of municipal sludge. On the other hand, Ni had different mobility in different
municipal sludge. PCA results were confirmed by the environmental behavior of heavy metals. |
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