비산재 중 PCNs의 알칼리 열분해 특성에 관한 연구
Alkali-Pyrolysis Characteristics of Polychlorinated Naphthalenes(PCNs)in Fly Ash
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Abstract
The behavior and removal characteristics of PCNs in fly ash obtained from municipal solid waste incineration facilities was investigated. The process was run under alkali pyrolytic treatment in a laboratory-scale heating system and the effective factors concerning its behavior were also investigated. The purpose of the investigation was to identify pyrolytic characteristic of PCNs which can be produced during combustion process. From the analysis results of sample ashes (A and B), the total concentrations of PCNs were 4.8 ng/g and 5.7 ng/g respectively. The change of PCNs concentrations upon the different temperatures for 1 h were monitored to be 4.74 ng/g, 7.39 ng/g at 100oC, 2.09 ng/g, 1.10 ng/g at 200oC and 19.15 ng/g, 18.46 ng/g at 300oC, respectively. At 200oC, the concentration of PCNs were decreased significantly. This phenomenon can be explained by thermal decomposition process, which is followed by dissociation reactions of chlorides. However, the exponential increase of concentrations of PCNs at 300oC would be the result of resynthesis of chlorides so called de novo synthesis. The concentration of PCNs from fly ashs which was treated 50 mL of 1M and 3M NaOH at 100oC, 200oC and 300oC respectively, were inversely proportions to NaOH concentration and temperature.
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