생활폐기물 소각시설 비산재의 열처리에 의한 중금속 특성 변화
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Abstract
The characteristic variations of heavy metals in fly ashes of municipal solid waste (MSW) incineration plants were investigated by thermal treatment using a laboratory-scale setup. The fly ashes were collected from spray dryer absorber/bag filter (SDA/BF) and electrostatic precipitator (EP) and thermally treated for three hours at a different temperature of 350oC, 450oC and 550oC. Raw and thermally-treated fly ashes were analyzed by Xray fluorescence spectrometer (XRF) and X-ray diffractometer (XRD). XRF's results showed that CaO was contained at a ratio of 40 % to 50 % in raw fly-ashes collected by SDA/BF, and 10 % in raw fly-ashes collected by EP. XRD's results showed that raw fly ashes collected by SDA/BF mainly contained CaClOH, Ca(OH)2 and CaCO3, but those collected by EP, NaCl, KCl and CaSO4. Calcium component in raw fly ashes of SDA/BF was due to the spray of lime (Ca(OH)2) for controlling acidic pollutants at SDA. After thermal treatment of fly ashes from SDA/BF, CaCO3 ratio was increased with the decrease of Ca(OH)2. Ca(OH)2 was decomposed to CaO and H2O, then CaCO3 was formed from the reaction of CaO with CO2.
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