Comparison of the characteristics of bottom and fly ashes generated from various incineration processes.
This study analyzed and compared the characteristics of bottom and fly ashes from three municipal solid waste incinerators (MSWIs) in Taiwan. Different incineration furnaces were investigated, including: (1) fluidized bed, (2) mass-burning, and (3) mass-burning linked rotary kiln. The particle size distribution, morphology, mineralogical and chemical composition, and leaching behavior of heavy metals of ash samples were evaluated. The results revealed that three types of incineration processes have different characteristic for ashes due to transportation and mixing system inside furnace. Particle size distribution indicated that 28.5% of MSWI-B bottom ash has lower than 180 microm and 61.2% of MSWI-A fly ash has larger than the 250 microm. The leaching concentration of Pb exceeded the regulatory level set by the Taiwan EPA in fly ashes from MSWI-B and MSWI-C, and thus must be considered hazardous wastes. Specifically, the leaching concentration of heavy metals of fly ashes from MSWI-A (fluidized bed incinerator) was lower than that of the others, and was corresponded to the regulatory levels. Therefore, a fluidized bed incineration process appears a potential of handling heavy metals for ashes. The result was also provided the valuable information for incinerator design and operation.
Chang
Feng-Yim
FY
Department of Environmental Engineering, National Chung-Hsing University, Taichung 402, Taiwan, ROC.
Wey
Ming-Yen
MY
D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D060729:Coal Ash; D017745:Incineration / Q000295:instrumentation* / Q000379:methods*; D019216:Metals, Heavy; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis / Q000138:chemical synthesis* / Q000737:chemistry*; D014961:X-Ray Diffraction
D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D002244:Carbon