| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程研究所 === 99 === The flourishing industry, highly economic growth, standard of living increase, and waste increase, construction of sewage systems by the government and drainage rates increase have contributed the rapid surge of sludge in sewage treatment plants. Due to the fact that the sludge is worth recycling, it should be properly treated to avoid further pollution. This research is conducted by the method of thermal cracking to explored the thermal properties of the changing sludge. The methods, including (1) Differentiation: Friedman method; (2) Integration method: Ozawa method and other methods are used to obtain different dynamic sludge pyrolysis model with the experimental values of the parameters of linear regression to compare the value of R2, and to analyze the applicability of the demand of the experimental kinetic parameters thermodynamics. The sludge sample utilized in this research is mainly the secondary sludge from Water Recycling Center in Anping, Tainan and organic sludge from Tainan Scientific and Industrial Park in Tainan. The moisture is controlled as A: <20%, B: 21-30%, C: 31-40%, D: 50-60%, and E: 70-85%. The thermal gravimetric analysis (TGA) is used under three different heating rates (5℃/min, 10℃/min, 15℃/min) for analysis. The research results are further calculated with Friedman and Ozawa methods to obtain the sludge pyrolysis different dynamic models, and then compared with analysis results of each mode calculated and the experimental values of TGA. The results demonstrate that the cracking process consists of study two stages. According to the research results, when the moisture rate is higher, the energy consumption in the first stage of cracking is greater. At the second stage, the cracking materials are less and the effects are vice versa when the moisture rate is lower. Furthermore, the calculation and experimental values obtained from Friedman and Ozawa methods are with the correlation (R2) 80% are above 0.9, and this demonstrates both has ideal applicability.
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