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수질오염물질의 산화처리용 포기조에서 산소의 물질전달특성

Oxygen Transfer Characterization in Aeration Tank for Oxidation Treatment of Water Pollutants

대전대학교 환경공학과, 대전 300-716
Department of Environmental Engineering, Daejeon University, Daejeon 300-716, Korea
HWAHAK KONGHAK, June 2002, 40(3), 340-344(5), NONE
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Abstract

산화처리용 포기조에서 산소의 물질전달특성을 고찰하였다. 주요 실험변수로서 공기공급량(0.5-3.0 ℓ/min), 교반속도(0-1,000 rpm), 임펠러수(1-3), 액상온도(20-40 ℃) 등이 적용되었다. 공기공급량, 교반속도, 액상온도가 증가할수록 총괄물질전달계수는 증가하였으며, 특히 공기공급량과 교반속도의 증가는 기체체류량 증가와 기포분쇄에 따른 기-액 접촉면적의 증가를 통해 총괄물질전달계수에 커다란 영향을 주는 것으로 나타났다. 총괄물질전달계수는 임펠러수에 비례하여 증가함을 보였으며, 교반속도가 높을 때 총괄물질전달계수에 대한 임펠러수의 영향이 좀더 뚜렷해지는 것으로 나타났다. 또한 총괄물질전달계수는 임펠러수, 공기공급량, 액상온도, 교반속도 등의 조업변수를 토대로한 상관식으로 나타낼 수 있었다.
The oxygen transfer characteristics has been investigated in a designed aeration tank for oxidation treatment of pollutants. As operating variables, air flow rate(0.5-3.0 ℓ/min), rotation speed(0-1,000 rpm), number of impeller(1-3), and liquid temperature(20-40 ℃) were applied. The experimental results showed that overall mass transfer coefficient was increased with increasing air flow rate, rotation speed, and liquid temperature. Especially, air flow rate and rotation speed exhibited much distinct effect due to an increase of gas holdup and air-liquid contact area by bubble break. It was also found that overall mass transfer coefficient changes in proportion to number of impeller and the intensity of the effect is largely dependent on rotation speed. The correlational equation of overall mass transfer coefficient was obtained in terms of the operating variables such as impeller number, air flow rate, temperature, and rotation speed.

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