Study on Resources Pretreatment for Bottom Ash Discharged from MSWI － Thermal Deodour by Fluidized Bed

• Main Authors: Che-Ming Chang, 張哲銘
• Other Authors: Yu-Min Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/2934yp

碩士 === 國立臺北科技大學 === 環境工程與管理研究所 === 96 === Because of the bottom ash gradually increase and ratio of recycle very low from waste incinerator, the odour will be influence recycle process. Adorpting the high heat transfer efficiency treatment the bottom ash by fluidized bed, the studies selection two operation parameter that the temperature and time, use the Triangular Odor Bag Method to selection the best operating parameters. Due to physics and chemistry characteristic of the bottom ash by waste composition influence, the sampling and analyzing of waste and bottom ash at waste incinerator in Taiwan. The analyzing item of waste has physics composition analysis, specific weight, element analysis, heat value and three component analysis. The analyzing item of bottom ash has three component analysis, ignition loss, toxic characteristic leaching process, total mass and oxide of analysis. The results of waste physics component analyzing the kitchen waste and wood waste for the majority, the water content of 50%,ash test of 10%, combustibility content of 40%. The results of bottom ash analyzing the water content of 25%,ash test of 70%, combustibility content of 5%, ignition loss approximately 3%.The ignition loss was a index of combustion efficiency. Therefore, will be generated odour in bottom ash when containing a large proportion of the kitchen waste. After the fluidized bed treatment, the odour index will reduce from 1,000 to 30 and removal efficiency approximately 97% at 200℃ and 150min.The paper also proposes a statistical regression relationship between the operation conditions and odour. The correlation is a Y＝－2.771t－4.306T＋1344.626（Y：odour index, t：time , T：temperature）. Therefore, can obtain an optimal condition to reduce the odour emitted from bottom ash by fluidized bed. The treatment cost approximately 1,799 NT for one ton.