Vitrification of Municipal Solid Waste Incineration Ash

• Main Authors: Yi-Jui Huang, 黃奕叡
• Other Authors: Chun-Teh Li
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/kpfx8u

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === The quantity and variety of waste has recently increased with the economic rapid growth of Taiwan. Therefore, the government preaches high volume reduction efficiency incineration process and plans to build 36 incinerators before year 2004. The problem in treating great quantities of incineration ash will surface soon. It is thus urgent to develop a good technology for reclamation of reusable resources. This study focused on the treatment of municipal solid waste by melting process, and investigated the effluence of melting process from different basicity and additive. The transformation and leaching of heavy metals before and after melting process were also analyzed to determine the detoxifying quality of molten ash. The results of this study are summarized as follows: The incineration ash from municipal solid waste can be treated by the melting process and is well detoxified under 1450℃ operating for 1.5 hours. The ash started to melt when the range of the basicity was between 0.240 and 1.75. The best ratio for melting is ash : glass = 8 : 1; the volume and weight reduction ratio are 65 % and 26.7 % respectively. It shows that the melting process has the advantage of high volume and weight reduction rate. The heavy metal transformation among metal phase was mainly Fe and Cu, and Mg, Al, Ca and Si predominate among slag phase. The molten slag became smooth and hard in surface structure, glass luster and it had no apparent pore. The melting material vitrified as the basicity was lower than 1.24 and it contributed to reduce heavy metal leaching. The porosity of slag phase was between 0.18 % and 1.14 %, the water adsorption was between 0.12 % and 0.78 %; the compressing strength is higher than 600 km/cm2, even reach 760 kg/cm2. The water tolerant and compress strength of the slag reach 15 % and 150 kg/cm2, corresponding to the first grade brick standard. It is thus feasible to recover the molten ash as a recover resource.