Statistical Model of Total Metal Concentration in Bottom Ash
Date Issued
2008
Date
2008
Author(s)
Chen, Yun-Gong
Abstract
The main objectives of this research were to profile distribution of heavy metals in bottom ash, to develop statistical models of heavy metal in bottom ash from Taipei county, Taipei city and Taoyuan county, then to correlate TCLP to total metal concentration. In terms of the data from EPA, the results of monitoring and statistics were analysed and compared with recycled bottom ash. Then the characteristics of distribution and statistical model were built and the correlation between total metal concentration and results of TCLP in bottom ash. According to the results, Pb and Cu were the components with higher content in bottom ash. The total metal concentration of Cu was 889 ~ 3,136 mg/kg. The total metal concentration of Pb was 384 ~ 1,158 mg/kg. The result of statistical analysis showed that there was appreciably positive correlation between total metal concentration and TCLP of Pb in bottom ash. And the more total metal concentration of Pb, the less diverseness data of TCLP of Pb in bottom ash. However, there was not appreciably positive correlation between total metal concentration and TCLP of Cu in bottom ash. But the more total metal concentration of Pb, the less diverseness data of TCLP of Pb in bottom ash, too. The results of regression of total metal concentration and TCLP of Cu and Pb in bottom ash appeared quadratic models of distribution with thresholds. It also showed that, the more total metal concentration in bottom ash, the more trends towards higher concentration of TCLP in bottom ash. The current data were so insufficient that the results of statistical analysis were short of representibility. So it is expediential to gather more data of batch of total metal concentration and TCLP in bottom ash in the light of diverseness of characteristics of bottom ash between different incinerators then to analyse them. The thresholds of total metal concentration in bottom ash will be applied for classification and risk assessment of recycled materals from bottom ash if there are more data for analysis and buildinding more complete and representative parameters. Thus, the management and application of recycled bottom ash will be expandable.
Subjects
bottom ash
total metal concentration
TCLP
characteristics of bottom ash
statistical model
Type
thesis
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