Release of salts from municipal solid waste combustion residues |
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| Authors: | Abbas Zareen Moghaddam Azadeh Partovi Steenari Britt-Marie |
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| Institution: | 1. Department of Chemistry, Göteborg University, SE-412 96 Göteborg, Sweden;2. Department of Environmental Inorganic Chemistry, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;1. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin Key Laboratory of Applied Catalysis Science and Technology, State Key Laboratory of Chemical Engineering (Tianjin University), School of Chemical Engineering, Tianjin University, Tianjin, 300072, China;3. Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, Espoo, 02150, Finland;4. Department of Environmental Science & Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, 361021, China;1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, PR China;2. School of Materials Science and Technology, China University of Geosciences, Beijing 100083, PR China *Corresponding author;1. Institute of Thermal and Power Engineering, Zhejiang University of Technology, Liuhe Road 288#, 310023 HangZhou, China;2. Shanghai Urban Planning and Design Research Institute, Tongren Road 331#, 200040 ShangHai, China;3. Delft University of Technology, P.O. Box 5048, 2628 CN Delft, the Netherlands |
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| Abstract: | Residues from fluidized bed combustion of municipal solid waste were investigated with respect to their leaching behavior and possible extraction of salts. The total water extractable amounts of Na, K, Ca, Cl(-), Br(-), F(-) and SO(4)(2-) along with the total dissolved solids of bottom, hopper, cyclone and bag house filter ashes were determined. A simple multistage washing process (using water as the extraction medium) was tested in lab scale experiments. The effect of variations in parameters, such as water to ash weight ratio, contact time, temperature and number of extraction steps was investigated. The leaching behavior of untreated and washed cyclone and bag house filter ashes was evaluated by a two-step batch-leaching test, i.e. the CEN test. The ashes investigated in this study can be arranged according to their decreasing water extractable contents and total dissolved solids as follows: filter ash > cyclone ash > hopper ash > bottom ash. A triple extraction with water at liquid to solid ratio 2 and extraction time 5 min gave the best results for the extraction of Ca, Na, K, Cl(-) and SO(4)(2-) from the cyclone as well as from the filter ashes. The leached amounts of salts in the CEN test performed on the washed cyclone ash were considerably lower than the corresponding amounts released from the unwashed ash. Thus, the washed cyclone ash was made more stable with respect to salt leachability. On the other hand, large amounts of salts were leached from the washed filter ashes as well as from unwashed filter ashes. Therefore, it can be concluded that three stage water extraction is not a suitable stabilization method for this type of filter ashes. |
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