Water washing effects on metals emission reduction during municipal solid waste incinerator (MSWI) fly ash melting process.
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.
Chiang
Kung-Yuh
KY
Department of Environmental Engineering and Science, Feng-Chia University, Tai-chung 407, Taiwan. kychiang@fcu.edu.tw
Hu
Yu-Hsin
YH
D002244:Carbon / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry; D060729:Coal Ash; D004787:Environmental Pollution / Q000517:prevention & control*; D006358:Hot Temperature; D017745:Incineration / Q000295:instrumentation / Q000379:methods*; D019216:Metals, Heavy / Q000737:chemistry*; D052638:Particulate Matter / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D013624:Taiwan; D014867:Water / Q000737:chemistry*
D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D014867:Water; D002713:Chlorine; D002244:Carbon