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하홍원,배성근 한국폐기물자원순환학회 2009 한국폐기물자원순환학회지 Vol.26 No.8
To develop a reasonable carbonization system for dyeing wastewater sludge, its thermal decomposition characteristics were estimated. In this study, isothermal and non-isothermal pyrolysis tests were carried out using a thermal-gravimetric analyzer (TGA) and lab scale reactor in respective. At the heating rate of 10℃/min in TGA, thermal decomposition was initiated at 250℃ and then progressed by 550℃. Dyeing wastewater sludge was mainly decomposed around 350℃ and the activation energy based on Arrhennius plot was 5.79 ~ 7.63 kcal/mol. As the results of isothermal pyrolysis tests, the optimum reaction temperature for carbonization was 450 ~ 500℃. As reaction temperature and residence time were increased, the yield of char and its heating value were decreased. Gaseous product was mainly consisted of CO2, CO, and CH4. As pyrolysis temperature was increased, the composition ratio of CO and CH4 was increased while CO2 was decreased. The heat needed for drying the moisture of dewatered sludge to 15% can be ideally compensated by combustion heat of liquid and gaseous products generated from carbonizing process on the assumption that a heat loss from facility is ignored and a complete combustion in carbonizer is accomplished.
하홍원,배성근 한국폐기물자원순환학회 2009 한국폐기물자원순환학회지 Vol.26 No.5
According to the 1996 Protocol of London Convention, the ocean dumping of organic sludges won't be applied any more in the near future. Therefore, the appropriate management and treatment of organic sludges has became an important issue. As one of alternative methods, carbonization technology of organic wastes comes in the spotlight. This study was done for dyeing wastewater sludge to develop a carbonization system combined with dryer. To design a reasonable dryer and deodorizer, the physicochemical and thermal properties of sludge and odor generation characteristics during drying process were estimated.