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자료유형
학술대회자료
저자정보
저널정보
한국유체기계학회 한국유체기계학회 학술대회 논문집 유체기계공업학회 제4회 한국유체공학학술대회 논문집 (제2권)
발행연도
2006.8
수록면
733 - 736 (4page)

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Sludge reduction by the sub-critical wet air oxidation (SCWAO; at <250℃ and 30 atm) was studied to find out the optimal operational parameters such as time, temperature, pressure, and oxidant dose. The initial suspended solids (SS) and total chemical oxygen demand (TCOD) concentrations of sludge used for the laboratory-scale experiment were 6,500 and 7,500 ㎎/L, respectively. When the temperature changed from 180 to 260℃ with 20℃ intervals, higher temperature was shown with higher TCOD removal efficiency at around 75%, and the soluble chemical oxygen demand (SCOD) was increased abruptly up to 2,000 ㎎/L within 10 min. At the same time, SS was decreased as SCOD increasing, implying organicsolids were liquefied during the process, with about 70% of SS decomposed within 10 min, whereas the organic acid concentration increased rapidly within 20 min. The higher temperature also resulted in higher organic acid concentration. Based on the results from the lab-scale experiments, a pilot plant with the capacity of 3 ㎥/d was designed and then operated at 60 min hydraulic retention time (HRT), 220℃, and <30 atm. Air was injected into the WAO reactor for the higher oxidation efficiency, at the flow rate of 50% of the stoichiometric oxygen requirement. The removal efficiencies for total solids and TCOD at 220℃, 30 atm, and 60 min HRT were over 70% and 40%, respectively, and the yields of volatile fatty acids (VFAs) and SCOD were 115 g VFAs/㎏ SS and 730 g SCOD/㎏ SS, respectively.

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Abstract
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3. 결과 및 고찰
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UCI(KEPA) : I410-ECN-0101-2010-554-002111502