Title: Morphological Analysis and Ecological Risk Assessment on Heavy Metals in the Activated Carbon Prepared from Sewage Sludge and Peanut Hull
Abstract: The speciation analysis of heavy metals had been carried out by BCR extraction method in activated carbon which was made of sewage sludge and peanut hull.The contents of Cd,Cr,Cu,Zn,Ni and Pb with their four speciation states in sewage sludge and the products of sludge pyrolysis had been measured by AAS(Atomic Absorption Spectrometry)for the study the speciation changing of heavy metal after pyrolysis.The results showed that the total content of Zn was the higher than the other heavy metal in the sewage sludge,and the total contents of Zn and Cu were exceeded that the values in the farming standards.Moreover,the acid-soluble and the reduction state of heavy metals in the sewage sludge could be transformed into the residual states in the activated carbon after the process of pyrogenation.With the comprehensive studying of various stable state ratios of heavy metals in the carbons obtained at different conditions,the pyrolysis temperature for the activated carbon was obtained at 600 ℃.Furthermore,a potential ecological risk assessment on heavy metals in sludge activated carbon was analysed and it revealed that the lowest risk index product of sewage sludge activated carbon could be obtained at the conditions of peanut hull was added by 20% and the pyrolysis temperature was 600 ℃.However,It also showed that the potential ecological risk index of Cd in activated carbon was higher than the others,which should be paid more attention before it was used.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 1
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