Prediction of Ignition Loss and Heating Value of Sewage Sludge by Thermo Gravimetry and Differential Thermal Analysis (TG-DTA)

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  • MAHZOUN Yahya
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University
  • OSHITA Kazuyuki
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University Graduate School of Global Environmental Studies, Kyoto University
  • TAKAOKA Masaki
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University Graduate School of Global Environmental Studies, Kyoto University
  • FUJIMORI Takashi
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University Graduate School of Global Environmental Studies, Kyoto University

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Other Title
  • 熱重量・示差熱分析による下水汚泥の強熱減量および発熱量推定

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 In this study, we investigated the prediction method of ignition loss and heating value of sewage sludge by thermo gravimetry and differential thermal analysis(TG-DTA). 29 kinds ×2 seasons of dewatered sludge collected from all over Japan were used for this study.<br> First, the ignition loss from the Japanese standard method and from the TG curve showed a high correlation of 1: 1, and the average value of the relative error was only 1.02%, so it was strong enough with sufficient accuracy and it was confirmed that ignition loss can be predicted. The DTA curve had two peaks and could be divided into two groups based on the magnitude of these peaks. From multivariate analysis and others, it was shown that this difference mainly comes from the presence or absence of anaerobic digestion. Comparing the lower heating value obtained from the peak area in DTA curve and empirical formula based on ignition loss and the calibration coefficient: K with the lower heating value by the bomb calorimeter and CHN analyzer, a high correlation of these values 1: 1 was roughly obtained and the average of the correlation errors were in the range of 5.17 to 5.20%, it was possible to predict the lower heating value. This simple method can predict the ignition loss and lower heating value simultaneously with less amount of sludge sample.

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