Department of Environmental Engineering and Science, Feng-Chia University, Tai-chung 407, Taiwan.
Waste Manag. 2010 May;30(5):831-8. doi: 10.1016/j.wasman.2009.12.009. Epub 2010 Jan 15.
This study investigated that water washing effects on the metals emission reduction in melting of municipal solid waste incinerator (MSWI) fly ash. Experimental conditions were conducted at liquid-to-solid (L/S) ratio 10, 20, and 100 for water-washing process and its subsequent melting treatment at 1450 degrees C for 2h. The simple water-washing process as a pre-treatment for MSWI fly ash can remove most of the chlorides, leachable salts, and amphoteric heavy metals from the MSWI fly ash, resulting in the washed ash having lowered chlorine content. MSWI fly ashes washed by L/S ratio 10 and above that were melted at 1450 degrees C produced slag containing relatively high vitrificaton ratio of Cu and Pb. Besides, the vitrification ratios of Na, K, Ca, and Mg in washed MSWI fly ash were also higher than that of MSWI fly ash. The results indicated that washed MSWI fly ash can reduce the emission of metallic chlorides during its subsequent melting treatment.
本研究探讨了水洗对熔融法处理城市生活垃圾焚烧飞灰中金属减排的影响。实验条件为水洗过程中的液固比（L/S）分别为 10、20 和 100，随后在 1450°C 下熔融处理 2h。简单的水洗预处理可去除大部分飞灰中的氯化物、可浸出盐和两性重金属，使水洗灰的氯含量降低。L/S 比为 10 及以上的飞灰经水洗后，在 1450°C 下熔融，得到的熔渣中 Cu 和 Pb 的玻璃体化率相对较高。此外，水洗飞灰中 Na、K、Ca 和 Mg 的玻璃体化率也高于原始飞灰。结果表明，水洗飞灰可减少后续熔融处理过程中金属氯化物的排放。
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