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폐수처리용 활성탄의 열재생
Thermal Regeneration of Activated Carbon for Waste Water Treatment
HWAHAK KONGHAK, October 1975, 13(5), 253-260(8), NONE
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Abstract
Fuchsine 수용액을 흡착시킨 과립상 활성탄을 수직석영관로내에서 400∼800 ℃범위로 간접 가열하여 재생하였다. 재생에 사용된 활성화기체로서는 탄산가스, 수증기 및 질소의 몰비가 1 : 1 : 6인 혼합가스를 사용하였다. 재생된 활성탄의 fuchsine 흡착능력, 표면적의 간접측정법에 의한 옥도가 및 밀도측정에 의하여 최적재생조작조건을 결정하였는데 반응온도는 650 ℃, 반응시간은 20분, 그리고 기체공급유량은 활성탄 단위 ㎏당 0.67㎥(표준상태)일 때 가장 좋은 재생결과를 얻을 수 있었다. 이 조건하에서는 재생조작중에 생기는 활성탄의 재생손실을 2 %이하로 유지할 수 있으므로 경제적 규모의 설계에 이를 적용용할 수 있을 것이며 활성탄의 재생에 고부하연소장치에서 얻어지는 연소가스를 활성화가스로 이용할 수 있는 가능성을 확인하였다.
Granular activated carbon that had been used in fuchsine dye-solution was regenerated by heating in a 1 m vertical quartz tube furnace at 400-800 ℃ using a mixture of carbon dioxide, steam and nitrogen as activating gases, whose composition was nearly equal to that of commercial oil-fired flue gas. By measuring the fuchsine-adsorption capacity, the iodine number and the physical properties of the active carbon regenerated, the optimal regenerating conditions were determined to give the reaction temperature of 650 ℃, the activating time of 20 min and the feed gas flow rate of 0.67 ㎥ STP/㎏-carbon. Under these conditions, carbon loss during the regenerating operation could be reduced below 2 % and thus the results here may be applied to the design of a large-scale unit. It is also suggested that oil combustion gas may be used as an activating agent for the regeneration of the granular active carbon.